зеркало из https://github.com/mozilla/gecko-dev.git
1576 строки
33 KiB
Groff
1576 строки
33 KiB
Groff
.ds TYPE CXX
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.\"
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.\" See the file LICENSE for redistribution information.
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.\"
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.\" Copyright (c) 1997, 1998
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.\" Sleepycat Software. All rights reserved.
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.\"
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.\" @(#)DbMpool.sox 10.22 (Sleepycat) 5/10/98
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.\"
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.\"
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.\" See the file LICENSE for redistribution information.
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.\"
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.\" Copyright (c) 1997, 1998
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.\" Sleepycat Software. All rights reserved.
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.\"
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.\" @(#)macros.so 10.45 (Sleepycat) 5/4/98
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.\"
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.\" We don't want hyphenation for any HTML documents.
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.ie '\*[HTML]'YES'\{\
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.nh
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\}
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.el\{\
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.ds Hy
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.hy
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..
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.ds Nh
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.nh
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..
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\}
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.\" The alternative text macro
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.\" This macro takes two arguments:
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.\" + the text produced if this is a "C" manpage
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.\" + the text produced if this is a "CXX" or "JAVA" manpage
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.\"
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.de Al
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.ie '\*[TYPE]'C'\{\\$1
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\}
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.el\{\\$2
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\}
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..
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.\" Scoped name macro.
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.\" Produces a_b, a::b, a.b depending on language
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.\" This macro takes two arguments:
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.\" + the class or prefix (without underscore)
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.\" + the name within the class or following the prefix
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.de Sc
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.ie '\*[TYPE]'C'\{\\$1_\\$2
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\}
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.el\{\
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.ie '\*[TYPE]'CXX'\{\\$1::\\$2
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\}
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.el\{\\$1.\\$2
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\}
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\}
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..
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.\" Scoped name for Java.
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.\" Produces Db.b, for Java, otherwise just b. This macro is used for
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.\" constants that must be scoped in Java, but are global otherwise.
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.\" This macro takes two arguments:
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.\" + the class
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.\" + the name within the class or following the prefix
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.de Sj
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.ie '\*[TYPE]'JAVA'\{\
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.TP 5
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Db.\\$1\}
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.el\{\
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.TP 5
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\\$1\}
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..
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.\" The general information text macro.
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.de Gn
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.ie '\*[TYPE]'C'\{The DB library is a family of groups of functions that provides a modular
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programming interface to transactions and record-oriented file access.
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The library includes support for transactions, locking, logging and file
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page caching, as well as various indexed access methods.
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Many of the functional groups (e.g., the file page caching functions)
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are useful independent of the other DB functions,
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although some functional groups are explicitly based on other functional
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groups (e.g., transactions and logging).
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\}
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.el\{The DB library is a family of classes that provides a modular
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programming interface to transactions and record-oriented file access.
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The library includes support for transactions, locking, logging and file
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page caching, as well as various indexed access methods.
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Many of the classes (e.g., the file page caching class)
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are useful independent of the other DB classes,
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although some classes are explicitly based on other classes
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(e.g., transactions and logging).
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\}
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For a general description of the DB package, see
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.IR db_intro (3).
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..
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.\" The library error macro, the local error macro.
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.\" These macros take one argument:
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.\" + the function name.
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.de Ee
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The
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.I \\$1
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.ie '\*[TYPE]'C'\{function may fail and return
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.I errno
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\}
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.el\{method may fail and throw a
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.IR DbException (3)
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.if '\*[TYPE]'CXX'\{
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or return
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.I errno
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\}
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\}
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for any of the errors specified for the following DB and library functions:
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..
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.de Ec
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In addition, the
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.I \\$1
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.ie '\*[TYPE]'C'\{function may fail and return
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.I errno
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\}
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.el\{method may fail and throw a
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.IR DbException (3)
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.ie '\*[TYPE]'CXX'\{or return
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.I errno
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\}
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.el\{encapsulating an
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.I errno
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\}
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\}
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for the following conditions:
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..
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.de Ea
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[EAGAIN]
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A lock was unavailable.
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..
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.de Eb
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[EBUSY]
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The shared memory region was in use and the force flag was not set.
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..
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.de Em
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[EAGAIN]
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The shared memory region was locked and (repeatedly) unavailable.
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..
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.de Ei
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[EINVAL]
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An invalid flag value or parameter was specified.
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..
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.de Es
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[EACCES]
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An attempt was made to modify a read-only database.
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..
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.de Et
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The DB_THREAD flag was specified and spinlocks are not implemented for
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this architecture.
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..
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.de Ep
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[EPERM]
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Database corruption was detected.
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All subsequent database calls (other than
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.ie '\*[TYPE]'C'\{\
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.IR DB->close )
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\}
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.el\{\
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.IR Db::close )
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\}
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will return EPERM.
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..
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.de Ek
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.if '\*[TYPE]'CXX'\{\
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Methods marked as returning
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.I errno
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will, by default, throw an exception that encapsulates the error information.
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The default error behavior can be changed, see
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.IR DbException (3).
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\}
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..
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.\" The SEE ALSO text macro
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.de Sa
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.\" make the line long for nroff.
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.if n .ll 72
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.nh
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.na
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.IR db_archive (1),
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.IR db_checkpoint (1),
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.IR db_deadlock (1),
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.IR db_dump (1),
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.IR db_load (1),
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.IR db_recover (1),
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.IR db_stat (1),
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.IR db_intro (3),
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.ie '\*[TYPE]'C'\{\
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.IR db_appinit (3),
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.IR db_cursor (3),
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.IR db_dbm (3),
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.IR db_internal (3),
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.IR db_lock (3),
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.IR db_log (3),
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.IR db_mpool (3),
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.IR db_open (3),
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.IR db_thread (3),
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.IR db_txn (3)
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\}
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.el\{\
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.IR db_internal (3),
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.IR db_thread (3),
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.IR Db (3),
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.IR Dbc (3),
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.IR DbEnv (3),
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.IR DbException (3),
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.IR DbInfo (3),
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.IR DbLock (3),
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.IR DbLockTab (3),
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.IR DbLog (3),
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.IR DbLsn (3),
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.IR DbMpool (3),
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.if !'\*[TYPE]'JAVA'\{\
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.IR DbMpoolFile (3),
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\}
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.IR Dbt (3),
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.IR DbTxn (3),
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.IR DbTxnMgr (3)
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\}
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.ad
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.Hy
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..
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.\" The function header macro.
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.\" This macro takes one argument:
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.\" + the function name.
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.de Fn
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.in 2
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.I \\$1
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.in
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..
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.\" The XXX_open function text macro, for merged create/open calls.
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.\" This macro takes two arguments:
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.\" + the interface, e.g., "transaction region"
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.\" + the prefix, e.g., "txn" (or the class name for C++, e.g., "DbTxn")
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.de Co
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.ie '\*[TYPE]'C'\{\
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.Fn \\$2_open
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The
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.I \\$2_open
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function copies a pointer, to the \\$1 identified by the
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.B directory
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.IR dir ,
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into the memory location referenced by
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.IR regionp .
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.PP
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If the
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.I dbenv
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argument to
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.I \\$2_open
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was initialized using
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.IR db_appinit ,
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.I dir
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is interpreted as described by
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.IR db_appinit (3).
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\}
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.el\{\
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.Fn \\$2::open
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The
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.I \\$2::open
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.ie '\*[TYPE]'CXX'\{\
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method copies a pointer, to the \\$1 identified by the
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.B directory
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.IR dir ,
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into the memory location referenced by
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.IR regionp .
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\}
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.el\{\
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method returns a \\$1 identified by the
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.B directory
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.IR dir .
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\}
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.PP
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If the
|
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.I dbenv
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argument to
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.I \\$2::open
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was initialized using
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.IR DbEnv::appinit ,
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.I dir
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is interpreted as described by
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.IR DbEnv (3).
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\}
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.PP
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Otherwise,
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if
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.I dir
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is not NULL,
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it is interpreted relative to the current working directory of the process.
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If
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.I dir
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is NULL,
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the following environment variables are checked in order:
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``TMPDIR'', ``TEMP'', and ``TMP''.
|
|
If one of them is set,
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\\$1 files are created relative to the directory it specifies.
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If none of them are set, the first possible one of the following
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directories is used:
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.IR /var/tmp ,
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.IR /usr/tmp ,
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.IR /temp ,
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.IR /tmp ,
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.I C:/temp
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and
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.IR C:/tmp .
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.PP
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All files associated with the \\$1 are created in this directory.
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|
This directory must already exist when
|
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.ie '\*[TYPE]'C'\{
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\\$1_open
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\}
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|
.el\{\
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\\$2::open
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\}
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is called.
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|
If the \\$1 already exists,
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|
the process must have permission to read and write the existing files.
|
|
If the \\$1 does not already exist,
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|
it is optionally created and initialized.
|
|
..
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.\" The common close language macro, for discarding created regions
|
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.\" This macro takes one argument:
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.\" + the function prefix, e.g., txn (the class name for C++, e.g., DbTxn)
|
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.de Cc
|
|
In addition, if the
|
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.I dir
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argument to
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.ie '\*[TYPE]'C'\{\
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|
.ds Va db_appinit
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.ds Vo \\$1_open
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.ds Vu \\$1_unlink
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\}
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.el\{\
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.ds Va DbEnv::appinit
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.ds Vo \\$1::open
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.ds Vu \\$1::unlink
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\}
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.I \\*(Vo
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was NULL
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and
|
|
.I dbenv
|
|
was not initialized using
|
|
.IR \\*(Va ,
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.if '\\$1'memp'\{\
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or the DB_MPOOL_PRIVATE flag was set,
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|
\}
|
|
all files created for this shared region will be removed,
|
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as if
|
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.I \\*(Vu
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were called.
|
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.rm Va
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.rm Vo
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.rm Vu
|
|
..
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.\" The DB_ENV information macro.
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.\" This macro takes two arguments:
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.\" + the function called to open, e.g., "txn_open"
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.\" + the function called to close, e.g., "txn_close"
|
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.de En
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.ie '\*[TYPE]'C'\{\
|
|
based on the
|
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.I dbenv
|
|
argument to
|
|
.IR \\$1 ,
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|
which is a pointer to a structure of type DB_ENV (typedef'd in <db.h>).
|
|
Applications will normally use the same DB_ENV structure (initialized
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by
|
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.IR db_appinit (3)),
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as an argument to all of the subsystems in the DB package.
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.PP
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References to the DB_ENV structure are maintained by DB,
|
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so it may not be discarded until the last close function,
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corresponding to an open function for which it was an argument,
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has returned.
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In order to ensure compatibility with future releases of DB, all fields of
|
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the DB_ENV structure that are not explicitly set should be initialized to 0
|
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before the first time the structure is used.
|
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Do this by declaring the structure external or static, or by calling the C
|
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library routine
|
|
.IR bzero (3)
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or
|
|
.IR memset (3).
|
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.PP
|
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The fields of the DB_ENV structure used by
|
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.I \\$1
|
|
are described below.
|
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.if '\*[TYPE]'CXX'\{\
|
|
As references to the DB_ENV structure may be maintained by
|
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.IR \\$1 ,
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it is necessary that the DB_ENV structure and memory it references be valid
|
|
until the
|
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.I \\$2
|
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function is called.
|
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\}
|
|
.ie '\\$1'db_appinit'\{The
|
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.I dbenv
|
|
argument may not be NULL.
|
|
If any of the fields of the
|
|
.I dbenv
|
|
are set to 0,
|
|
defaults appropriate for the system are used where possible.
|
|
\}
|
|
.el\{If
|
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.I dbenv
|
|
is NULL
|
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or any of its fields are set to 0,
|
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defaults appropriate for the system are used where possible.
|
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\}
|
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.PP
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The following fields in the DB_ENV structure may be initialized before calling
|
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.IR \\$1 :
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\}
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.el\{\
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based on which set methods have been used.
|
|
It is expected that applications will use a single DbEnv object as the
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argument to all of the subsystems in the DB package.
|
|
The fields of the DbEnv object used by
|
|
.I \\$1
|
|
are described below.
|
|
As references to the DbEnv object may be maintained by
|
|
.IR \\$1 ,
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|
it is necessary that the DbEnv object and memory it references be valid
|
|
until the object is destroyed.
|
|
.ie '\\$1'appinit'\{\
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|
The
|
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.I dbenv
|
|
argument may not be NULL.
|
|
If any of the fields of the
|
|
.I dbenv
|
|
are set to 0,
|
|
defaults appropriate for the system are used where possible.
|
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\}
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.el\{\
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Any of the DbEnv fields that are not explicitly set will default to
|
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appropriate values.
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\}
|
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.PP
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The following fields in the DbEnv object may be initialized, using the
|
|
appropriate set method, before calling
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.IR \\$1 :
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\}
|
|
..
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.\" The DB_ENV common fields macros.
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.de Se
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.if '\*[TYPE]'JAVA'\{\
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.TP 5
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DbErrcall db_errcall;
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.ns
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.TP 5
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String db_errpfx;
|
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.ns
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.TP 5
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int db_verbose;
|
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The error fields of the DbEnv behave as described for
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.IR DbEnv (3).
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|
\}
|
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.ie '\*[TYPE]'CXX'\{\
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.TP 5
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void *(*db_errcall)(char *db_errpfx, char *buffer);
|
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.ns
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|
.TP 5
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FILE *db_errfile;
|
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.ns
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|
.TP 5
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const char *db_errpfx;
|
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.ns
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.TP 5
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class ostream *db_error_stream;
|
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.ns
|
|
.TP 5
|
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int db_verbose;
|
|
The error fields of the DbEnv behave as described for
|
|
.IR DbEnv (3).
|
|
\}
|
|
.el\{\
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void *(*db_errcall)(char *db_errpfx, char *buffer);
|
|
.ns
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.TP 5
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FILE *db_errfile;
|
|
.ns
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|
.TP 5
|
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const char *db_errpfx;
|
|
.ns
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.TP 5
|
|
int db_verbose;
|
|
The error fields of the DB_ENV behave as described for
|
|
.IR db_appinit (3).
|
|
.sp
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|
\}
|
|
..
|
|
.\" The open flags.
|
|
.de Fm
|
|
The
|
|
.I flags
|
|
and
|
|
.I mode
|
|
arguments specify how files will be opened and/or created when they
|
|
don't already exist.
|
|
The flags value is specified by
|
|
.BR or 'ing
|
|
together one or more of the following values:
|
|
.Sj DB_CREATE
|
|
Create any underlying files, as necessary.
|
|
If the files do not already exist and the DB_CREATE flag is not specified,
|
|
the call will fail.
|
|
..
|
|
.\" DB_THREAD open flag macro.
|
|
.\" This macro takes two arguments:
|
|
.\" + the open function name
|
|
.\" + the object it returns.
|
|
.de Ft
|
|
.TP 5
|
|
.Sj DB_THREAD
|
|
Cause the \\$2 handle returned by the
|
|
.I \\$1
|
|
.Al function method
|
|
to be useable by multiple threads within a single address space,
|
|
i.e., to be ``free-threaded''.
|
|
.if '\*[TYPE]'JAVA'\{\
|
|
Threading is assumed in the Java API,
|
|
so no special flags are required,
|
|
and DB functions will always behave as if the DB_THREAD flag was specified.
|
|
\}
|
|
..
|
|
.\" The mode macro.
|
|
.\" This macro takes one argument:
|
|
.\" + the subsystem name.
|
|
.de Mo
|
|
All files created by the \\$1 are created with mode
|
|
.I mode
|
|
(as described in
|
|
.IR chmod (2))
|
|
and modified by the process' umask value at the time of creation (see
|
|
.IR umask (2)).
|
|
The group ownership of created files is based on the system and directory
|
|
defaults, and is not further specified by DB.
|
|
..
|
|
.\" The application exits macro.
|
|
.\" This macro takes one argument:
|
|
.\" + the application name.
|
|
.de Ex
|
|
The
|
|
.I \\$1
|
|
utility exits 0 on success, and >0 if an error occurs.
|
|
..
|
|
.\" The application -h section.
|
|
.\" This macro takes one argument:
|
|
.\" + the application name
|
|
.de Dh
|
|
DB_HOME
|
|
If the
|
|
.B \-h
|
|
option is not specified and the environment variable
|
|
.I DB_HOME
|
|
is set, it is used as the path of the database home, as described in
|
|
.IR db_appinit (3).
|
|
..
|
|
.\" The function DB_HOME ENVIRONMENT VARIABLES section.
|
|
.\" This macro takes one argument:
|
|
.\" + the open function name
|
|
.de Eh
|
|
DB_HOME
|
|
If the
|
|
.I dbenv
|
|
argument to
|
|
.I \\$1
|
|
was initialized using
|
|
.IR db_appinit ,
|
|
the environment variable DB_HOME may be used as the path of the database
|
|
home for the interpretation of the
|
|
.I dir
|
|
argument to
|
|
.IR \\$1 ,
|
|
as described in
|
|
.IR db_appinit (3).
|
|
.if \\n(.$>1 \{Specifically,
|
|
.I \\$1
|
|
is affected by the configuration string value of \\$2.\}
|
|
..
|
|
.\" The function TMPDIR ENVIRONMENT VARIABLES section.
|
|
.\" This macro takes two arguments:
|
|
.\" + the interface, e.g., "transaction region"
|
|
.\" + the prefix, e.g., "txn" (or the class name for C++, e.g., "DbTxn")
|
|
.de Ev
|
|
TMPDIR
|
|
If the
|
|
.I dbenv
|
|
argument to
|
|
.ie '\*[TYPE]'C'\{\
|
|
.ds Vo \\$2_open
|
|
\}
|
|
.el\{\
|
|
.ds Vo \\$2::open
|
|
\}
|
|
.I \\*(Vo
|
|
was NULL or not initialized using
|
|
.IR db_appinit ,
|
|
the environment variable TMPDIR may be used as the directory in which to
|
|
create the \\$1,
|
|
as described in the
|
|
.I \\*(Vo
|
|
section above.
|
|
.rm Vo
|
|
..
|
|
.\" The unused flags macro.
|
|
.de Fl
|
|
The
|
|
.I flags
|
|
parameter is currently unused, and must be set to 0.
|
|
..
|
|
.\" The no-space TP macro.
|
|
.de Nt
|
|
.br
|
|
.ns
|
|
.TP 5
|
|
..
|
|
.\" The return values of the functions macros.
|
|
.\" Rc is the standard two-value return with a suffix for more values.
|
|
.\" Ro is the standard two-value return but there were previous values.
|
|
.\" Rt is the standard two-value return, returning errno, 0, or < 0.
|
|
.\" These macros take one argument:
|
|
.\" + the routine name
|
|
.de Rc
|
|
The
|
|
.I \\$1
|
|
.ie '\*[TYPE]'C'\{function returns the value of
|
|
.I errno
|
|
on failure,
|
|
0 on success,
|
|
\}
|
|
.el\{method throws a
|
|
.IR DbException (3)
|
|
.ie '\*[TYPE]'CXX'\{or returns the value of
|
|
.I errno
|
|
on failure,
|
|
0 on success,
|
|
\}
|
|
.el\{that encapsulates an
|
|
.I errno
|
|
on failure,
|
|
\}
|
|
\}
|
|
..
|
|
.de Ro
|
|
Otherwise, the
|
|
.I \\$1
|
|
.ie '\*[TYPE]'C'\{function returns the value of
|
|
.I errno
|
|
on failure and 0 on success.
|
|
\}
|
|
.el\{method throws a
|
|
.IR DbException (3)
|
|
.ie '\*[TYPE]'CXX'\{or returns the value of
|
|
.I errno
|
|
on failure and 0 on success.
|
|
\}
|
|
.el\{that encapsulates an
|
|
.I errno
|
|
on failure,
|
|
\}
|
|
\}
|
|
..
|
|
.de Rt
|
|
The
|
|
.I \\$1
|
|
.ie '\*[TYPE]'C'\{function returns the value of
|
|
.I errno
|
|
on failure and 0 on success.
|
|
\}
|
|
.el\{method throws a
|
|
.IR DbException (3)
|
|
.ie '\*[TYPE]'CXX'\{or returns the value of
|
|
.I errno
|
|
on failure and 0 on success.
|
|
\}
|
|
.el\{that encapsulates an
|
|
.I errno
|
|
on failure.
|
|
\}
|
|
\}
|
|
..
|
|
.\" The TXN id macro.
|
|
.de Tx
|
|
.IP
|
|
If the file is being accessed under transaction protection,
|
|
the
|
|
.I txnid
|
|
parameter is a transaction ID returned from
|
|
.IR txn_begin ,
|
|
otherwise, NULL.
|
|
..
|
|
.\" The XXX_unlink function text macro.
|
|
.\" This macro takes two arguments:
|
|
.\" + the interface, e.g., "transaction region"
|
|
.\" + the prefix (for C++, this is the class name)
|
|
.de Un
|
|
.ie '\*[TYPE]'C'\{\
|
|
.ds Va db_appinit
|
|
.ds Vc \\$2_close
|
|
.ds Vo \\$2_open
|
|
.ds Vu \\$2_unlink
|
|
\}
|
|
.el\{\
|
|
.ds Va DbEnv::appinit
|
|
.ds Vc \\$2::close
|
|
.ds Vo \\$2::open
|
|
.ds Vu \\$2::unlink
|
|
\}
|
|
.Fn \\*(Vu
|
|
The
|
|
.I \\*(Vu
|
|
.Al function method
|
|
destroys the \\$1 identified by the directory
|
|
.IR dir ,
|
|
removing all files used to implement the \\$1.
|
|
.ie '\\$2'log' \{(The log files themselves and the directory
|
|
.I dir
|
|
are not removed.)\}
|
|
.el \{(The directory
|
|
.I dir
|
|
is not removed.)\}
|
|
If there are processes that have called
|
|
.I \\*(Vo
|
|
without calling
|
|
.I \\*(Vc
|
|
(i.e., there are processes currently using the \\$1),
|
|
.I \\*(Vu
|
|
will fail without further action,
|
|
unless the force flag is set,
|
|
in which case
|
|
.I \\*(Vu
|
|
will attempt to remove the \\$1 files regardless of any processes
|
|
still using the \\$1.
|
|
.PP
|
|
The result of attempting to forcibly destroy the region when a process
|
|
has the region open is unspecified.
|
|
Processes using a shared memory region maintain an open file descriptor
|
|
for it.
|
|
On UNIX systems, the region removal should succeed
|
|
and processes that have already joined the region should continue to
|
|
run in the region without change,
|
|
however processes attempting to join the \\$1 will either fail or
|
|
attempt to create a new region.
|
|
On other systems, e.g., WNT, where the
|
|
.IR unlink (2)
|
|
system call will fail if any process has an open file descriptor
|
|
for the file,
|
|
the region removal will fail.
|
|
.PP
|
|
In the case of catastrophic or system failure,
|
|
database recovery must be performed (see
|
|
.IR db_recover (1)
|
|
or the DB_RECOVER and DB_RECOVER_FATAL flags to
|
|
.IR \\*(Va (3)).
|
|
Alternatively, if recovery is not required because no database state is
|
|
maintained across failures,
|
|
it is possible to clean up a \\$1 by removing all of the
|
|
files in the directory specified to the
|
|
.I \\*(Vo
|
|
.Al function, method,
|
|
as \\$1 files are never created in any directory other than the one
|
|
specified to
|
|
.IR \\*(Vo .
|
|
Note, however,
|
|
that this has the potential to remove files created by the other DB
|
|
subsystems in this database environment.
|
|
.PP
|
|
.Rt \\*(Vu
|
|
.rm Va
|
|
.rm Vo
|
|
.rm Vu
|
|
.rm Vc
|
|
..
|
|
.\" Signal paragraph for standard utilities.
|
|
.\" This macro takes one argument:
|
|
.\" + the utility name.
|
|
.de Si
|
|
The
|
|
.I \\$1
|
|
utility attaches to DB shared memory regions.
|
|
In order to avoid region corruption,
|
|
it should always be given the chance to detach and exit gracefully.
|
|
To cause
|
|
.I \\$1
|
|
to clean up after itself and exit,
|
|
send it an interrupt signal (SIGINT).
|
|
..
|
|
.\" Logging paragraph for standard utilities.
|
|
.\" This macro takes one argument:
|
|
.\" + the utility name.
|
|
.de Pi
|
|
.B \-L
|
|
Log the execution of the \\$1 utility to the specified file in the
|
|
following format, where ``###'' is the process ID, and the date is
|
|
the time the utility starting running.
|
|
.sp
|
|
\\$1: ### Wed Jun 15 01:23:45 EDT 1995
|
|
.sp
|
|
This file will be removed if the \\$1 utility exits gracefully.
|
|
..
|
|
.\" Malloc paragraph.
|
|
.\" This macro takes one argument:
|
|
.\" + the allocated object
|
|
.de Ma
|
|
.if !'\*[TYPE]'JAVA'\{\
|
|
\\$1 are created in allocated memory.
|
|
If
|
|
.I db_malloc
|
|
is non-NULL,
|
|
it is called to allocate the memory,
|
|
otherwise,
|
|
the library function
|
|
.IR malloc (3)
|
|
is used.
|
|
The function
|
|
.I db_malloc
|
|
must match the calling conventions of the
|
|
.IR malloc (3)
|
|
library routine.
|
|
Regardless,
|
|
the caller is responsible for deallocating the returned memory.
|
|
To deallocate the returned memory,
|
|
free each returned memory pointer;
|
|
pointers inside the memory do not need to be individually freed.
|
|
\}
|
|
..
|
|
.\" Underlying function paragraph.
|
|
.\" This macro takes two arguments:
|
|
.\" + the function name
|
|
.\" + the utility name
|
|
.de Uf
|
|
The
|
|
.I \\$1
|
|
.Al function method
|
|
is the underlying function used by the
|
|
.IR \\$2 (1)
|
|
utility.
|
|
See the source code for the
|
|
.I \\$2
|
|
utility for an example of using
|
|
.I \\$1
|
|
in a UNIX environment.
|
|
..
|
|
.\" Underlying function paragraph, for C++.
|
|
.\" This macro takes three arguments:
|
|
.\" + the C++ method name
|
|
.\" + the function name for C
|
|
.\" + the utility name
|
|
.de Ux
|
|
The
|
|
.I \\$1
|
|
method is based on the C
|
|
.I \\$2
|
|
function, which
|
|
is the underlying function used by the
|
|
.IR \\$3 (1)
|
|
utility.
|
|
See the source code for the
|
|
.I \\$3
|
|
utility for an example of using
|
|
.I \\$2
|
|
in a UNIX environment.
|
|
..
|
|
.\" Stat field macro.
|
|
.de Sf
|
|
.ie '\*[TYPE]'CXX'\{\
|
|
u_int32_t \\$1;\}
|
|
.el\{\
|
|
int get_\\$1();\}
|
|
..
|
|
.TH DbMpool 3 "May 10, 1998"
|
|
.UC 7
|
|
.SH NAME
|
|
DbMpool \- shared memory buffer pool
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.ft B
|
|
.ie '\*[TYPE]'CXX'\{
|
|
#include <db_cxx.h>
|
|
|
|
static int
|
|
DbMpool::open(char *dir,
|
|
.ti +5
|
|
u_int32_t flags, int mode, DbEnv *dbenv, DbMpool **regionp);
|
|
|
|
int
|
|
DbMpool::close();
|
|
|
|
static int
|
|
DbMpool::unlink(const char *dir, int force, DbEnv *);
|
|
|
|
int
|
|
DbMpool::db_register(int ftype,
|
|
.ti +5
|
|
int (*pgin)(db_pgno_t pgno, void *pgaddr, Dbt *pgcookie),
|
|
.ti +5
|
|
int (*pgout)(db_pgno_t pgno, void *pgaddr, Dbt *pgcookie));
|
|
|
|
int
|
|
DbMpool::trickle(int pct, int *nwrotep);
|
|
|
|
int
|
|
DbMpool::sync(LSN *lsn);
|
|
|
|
int
|
|
DbMpool::stat(DB_MPOOL_STAT **gsp,
|
|
.ti +5
|
|
DB_MPOOL_FSTAT *(*fsp)[], void *(*db_malloc)(size_t));
|
|
\}
|
|
.el\{\
|
|
import com.sleepycat.db.*;
|
|
|
|
public DbMpoolStat stat()
|
|
.ti +5
|
|
throws DbException;
|
|
|
|
public DbMpoolFStat[] fstat()
|
|
.ti +5
|
|
throws DbException;
|
|
|
|
public int trickle(int pct)
|
|
.ti +5
|
|
throws DbException;
|
|
|
|
\}
|
|
.ft R
|
|
.fi
|
|
.SH DESCRIPTION
|
|
.Gn
|
|
.PP
|
|
This manual page describes the specific details of the memory pool interface.
|
|
.PP
|
|
The
|
|
.IR DbMpool (3)
|
|
.ie '\*[TYPE]'CXX'\{\
|
|
and
|
|
.IR DbMpoolFile (3)
|
|
classes are
|
|
\}
|
|
.el\{\
|
|
class is
|
|
\}
|
|
the library interface intended to provide general-purpose,
|
|
page-oriented buffer management of one or more files.
|
|
While designed to work with the other Db classes, this class is
|
|
also useful for more general purposes.
|
|
The memory pools (DbMpool's) are referred to in this document as
|
|
simply ``pools''.
|
|
.if '\*[TYPE]'JAVA'\{\
|
|
The DbMpool class has a small subset of the corresponding DB/C++
|
|
functionality. This class has been provided to allow certain
|
|
administrative actions on underlying Mpool's opened as a consequence
|
|
of DbEnv.appinit(). Direct access to other Mpool functionality is
|
|
not appropriate for the Java environment.
|
|
\}
|
|
.if '\*[TYPE]'CXX'\{\
|
|
Pools may be shared between processes.
|
|
Pools are usually filled by pages from one or more files (DbMpoolFile's).
|
|
Pages in the pool are replaced in LRU (least-recently-used) order,
|
|
with each new page replacing the page that has been unused the longest.
|
|
Pages retrieved from the pool using
|
|
.I DbMpoolFile::get
|
|
are ``pinned'' in the pool, by default,
|
|
until they are returned to the pool's control using the
|
|
.I DbMpoolFile::put
|
|
method.
|
|
.PP
|
|
.Co "memory pool" DbMpool
|
|
.PP
|
|
.Fm
|
|
.Sj DB_MPOOL_PRIVATE
|
|
Create a private MPOOL that is not shared with any other process (although
|
|
it may be shared with other threads).
|
|
.Sj DB_NOMMAP
|
|
Always copy files in this memory pool into the local cache instead of mapping
|
|
them into process memory (see the description of the
|
|
.I mp_mmapsize
|
|
field of the DbEnv object for further information).
|
|
.Ft DbMpool::open DbMpool
|
|
.PP
|
|
.Mo "memory pool subsystem (other than files created by the \fImemp_fopen\fP method, which are separately specified)"
|
|
.PP
|
|
The memory pool subsystem is configured
|
|
.En "DbMpool::open" "DbMpool::closed"
|
|
.TP 5
|
|
.Se
|
|
.TP 5
|
|
size_t mp_mmapsize;
|
|
Files that are opened read-only in the pool (and that satisfy a few other
|
|
criteria) are, by default,
|
|
mapped into the process address space instead of being copied into the local
|
|
cache.
|
|
This can result in better-than-usual performance,
|
|
as available virtual memory is normally much larger than the local cache,
|
|
and page faults are faster than page copying on many systems.
|
|
However,
|
|
in the presence of limited virtual memory it can cause resource starvation,
|
|
and in the presence of large databases,
|
|
it can result in immense process sizes.
|
|
If
|
|
.I mp_mmapsize
|
|
is non-zero,
|
|
it specifies the maximum file size, in bytes,
|
|
for a file to be mapped into the process address space.
|
|
By default,
|
|
it is set to 10Mb.
|
|
.TP 5
|
|
size_t mp_size;
|
|
The suggested size of the pool, in bytes.
|
|
This should be the size of the normal working data set of the application,
|
|
with some small amount of additional memory for unusual situations.
|
|
(Note,
|
|
the working set is not the same as the number of simultaneously referenced
|
|
pages,
|
|
and should be quite a bit larger!)
|
|
The default cache size is 128K bytes (16 8K byte pages),
|
|
and may not be less than 20K bytes.
|
|
.PP
|
|
.Rt DbMpool::open
|
|
.PP
|
|
.Fn DbMpool::close
|
|
The
|
|
.I DbMpool::close
|
|
method closes the pool indicated by the DbMpool object,
|
|
as returned by
|
|
.IR DbMpool::open .
|
|
This method does not imply a call to
|
|
.IR DbMpoolFile::sync ,
|
|
but does imply a call to
|
|
.I DbMpoolFile::close
|
|
for any remaining open DbMpoolFile objects returned to this process by
|
|
calls to
|
|
.IR DbMpoolFile::open .
|
|
.PP
|
|
.Cc DbMpool
|
|
.PP
|
|
When multiple threads are using the DbMpool handle concurrently,
|
|
only a single thread may call the
|
|
.I DbMpool::close
|
|
method.
|
|
.PP
|
|
.Rt DbMpool::close
|
|
.PP
|
|
.Un "memory pool" DbMpool
|
|
.PP
|
|
.Fn DbMpool::db_register
|
|
The
|
|
.I DbMpool::db_register
|
|
method registers page-in and page-out functions for files of type
|
|
.I ftype
|
|
in the specified pool.
|
|
.PP
|
|
If the
|
|
.I pgin
|
|
function is non-NULL,
|
|
it is called each time a page is read into the memory pool from a file
|
|
of type
|
|
.IR ftype ,
|
|
or a page is created for a file of type
|
|
.I ftype
|
|
(see the DB_MPOOL_CREATE flag for the
|
|
.I DbMpoolFile::get
|
|
method).
|
|
If the
|
|
.I pgout
|
|
function is non-NULL,
|
|
it is called each time a page is written to a file of type
|
|
.IR ftype .
|
|
.PP
|
|
Both the
|
|
.I pgin
|
|
and
|
|
.I pgout
|
|
functions are called with the page number,
|
|
a pointer to the page being read or written,
|
|
and any argument
|
|
.I pgcookie
|
|
that was specified to the
|
|
.I DbMpoolFile::open
|
|
method when the file was opened.
|
|
The
|
|
.I pgin
|
|
and
|
|
.I pgout
|
|
functions should return 0 on success,
|
|
and an applicable non-zero
|
|
.I errno
|
|
value on failure,
|
|
in which case the
|
|
.I DbMpool
|
|
method calling it will also fail,
|
|
returning that
|
|
.I errno
|
|
value.
|
|
.PP
|
|
The purpose of the
|
|
.I DbMpool::db_register
|
|
method is to support processing when pages are entered into,
|
|
or flushed from,
|
|
the pool.
|
|
A file type must be specified to make it possible for unrelated
|
|
threads or processes,
|
|
that are sharing a pool,
|
|
to evict each other's pages from the pool.
|
|
Applications should call
|
|
.IR DbMpool::db_register ,
|
|
during initialization,
|
|
for each type of file requiring input or output processing that will be
|
|
sharing the underlying pool.
|
|
(No registry is necessary for the standard access method types,
|
|
btree, hash and recno, as
|
|
.IR Db::open (3)
|
|
registers them separately.)
|
|
.PP
|
|
If a thread or process does not call
|
|
.I DbMpool::db_register
|
|
for a file type,
|
|
it is impossible for it to evict pages for any file requiring input or
|
|
output processing from the pool.
|
|
For this reason,
|
|
.I DbMpool::db_register
|
|
should always be called by each application sharing a pool for each type of
|
|
file included in the pool,
|
|
regardless of whether or not the application itself uses files of that type.
|
|
.PP
|
|
There are no standard values for
|
|
.IR ftype ,
|
|
.IR pgin ,
|
|
.I pgout
|
|
and
|
|
.IR pgcookie ,
|
|
except that the
|
|
.I ftype
|
|
value for a file must be a non-zero positive number,
|
|
as negative numbers are reserved for internal use by the DB library.
|
|
For this reason,
|
|
applications sharing a pool must coordinate their values amongst themselves.
|
|
.PP
|
|
.Rt DbMpool::db_register
|
|
\}
|
|
.PP
|
|
.Fn DbMpool::trickle
|
|
The
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|
.I DbMpool::trickle
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|
method ensures that at least
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|
.I pct
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|
percent of the pages in the shared memory pool are clean by writing dirty
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|
pages to their backing files.
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|
.ie '\*[TYPE]'CXX'\{\
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|
If the
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|
.I nwrotep
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|
argument is non-NULL,
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|
the number of pages that were written to reach the correct percentage is
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|
returned in the memory location it references.
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|
\}
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|
.el\{\
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|
The number of pages that were written to reach the correct percentage is
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|
returned.
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|
\}
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|
.PP
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|
The purpose of the
|
|
.I DbMpool::trickle
|
|
method is to enable a memory pool manager to ensure that a page is
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|
always available for reading in new information without having to wait
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|
for a write.
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|
.PP
|
|
.Rt DbMpool::trickle
|
|
.if '\*[TYPE]'CXX'\{\
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|
.PP
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|
.Fn DbMpool::sync
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|
The
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.I DbMpool::sync
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|
method ensures that all the modified pages in the pool with log sequence
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|
numbers (LSNs) less than the
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|
.I lsn
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|
argument are written to disk.
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|
.PP
|
|
.Rc DbMpool::sync
|
|
and DB_INCOMPLETE if there were pages which need to be written but which
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|
.I DbMpool::sync
|
|
was unable to write immediately.
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|
In addition,
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|
if
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|
.I DbMpool::sync
|
|
returns success,
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|
the value of
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|
.I lsn
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|
will be overwritten with the largest LSN from any page which was written by
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|
.I DbMpool::sync
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|
to satisfy this request.
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|
.PP
|
|
The purpose of the
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|
.I DbMpool::sync
|
|
method is to enable a transaction manager to ensure,
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|
as part of a checkpoint,
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|
that all pages modified by a certain time have been written to disk.
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|
Pages in the pool which cannot be written back to disk immediately (e.g.,
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|
are currently pinned) are written to disk as soon as it is possible to do
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|
so.
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|
The expected behavior of the transaction manager is to call the
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|
.I DbMpool::sync
|
|
method and then,
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|
if the return indicates that some pages could not be written immediately,
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|
to wait briefly and retry again with the same LSN until the
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|
.I DbMpool::sync
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|
method returns that all pages have been written.
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|
.PP
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|
To support the
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|
.I DbMpool::sync
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|
functionality,
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it is necessary that the pool methods know the location of the LSN on
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the page for each file type.
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This location should be specified when the file is opened using the
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|
.I DbMpoolFile::open
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|
method.
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|
(Note, it is not required that the LSN be aligned on the page in any way.)
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|
\}
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.PP
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|
.Fn DbMpool::stat
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|
.ie '\*[TYPE]'CXX'\{
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|
The
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.I DbMpool::stat
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|
method creates statistical structures and copies
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|
pointers to them into
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|
user-specified memory locations.
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|
\}
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|
.el\{\
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|
.Fn DbMpool::fstat
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|
The
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.I DbMpool::stat
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|
and
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|
.I DbMpool::fstat
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|
methods create statistical structures and return
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|
to the caller.
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|
\}
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|
The statistics include the number of files participating in the pool,
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|
the active pages in the pool,
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|
and information as to how effective the cache has been.
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.PP
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|
.Ma "Statistical structures"
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.PP
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|
.ie '\*[TYPE]'CXX'\{\
|
|
If
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|
.I gsp
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|
is non-NULL, the global statistics for the memory pool
|
|
object
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|
are copied into the memory location it references.
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|
The global statistics are stored in a structure of type
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|
DB_MPOOL_STAT (typedef'd in <db_cxx.h>).
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|
.PP
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|
The following DB_MPOOL_STAT fields will be filled in:
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|
.TP 5
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|
u_int32_t st_refcnt;
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|
The number of references to the region.
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|
.Nt
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|
u_int32_t st_regsize;
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|
The size of the region.
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|
.Nt
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|
size_t st_cachesize;
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|
\}
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|
.el\{\
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|
The
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|
.I stat
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|
method creates a DbMpoolStat object containing global
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|
statistics. The fields can be accessed via methods:
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|
.TP 5
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|
long get_st_cachesize();
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|
\}
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|
Cache size in bytes.
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.Nt
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|
.Sf st_cache_hit
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|
Requested pages found in the cache.
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.Nt
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|
.Sf st_cache_miss
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|
Requested pages not found in the cache.
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|
.Nt
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|
.Sf st_map
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|
Requested pages mapped into the process' address space (there is no
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|
available information as to whether or not this request caused disk I/O,
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|
although examining the application page fault rate may be helpful).
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.Nt
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|
.Sf st_page_create
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|
Pages created in the cache.
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.Nt
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|
.Sf st_page_in
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|
Pages read into the cache.
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.Nt
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|
.Sf st_page_out
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|
Pages written from the cache to the backing file.
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|
.Nt
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|
.Sf st_ro_evict
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|
Clean pages forced from the cache.
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|
.Nt
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|
.Sf st_rw_evict
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|
Dirty pages forced from the cache.
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|
.Nt
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|
.Sf st_hash_buckets
|
|
Number of hash buckets in buffer hash table.
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|
.Nt
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|
.Sf st_hash_searches
|
|
Total number of buffer hash table lookups.
|
|
.Nt
|
|
.Sf st_hash_longest
|
|
The longest chain ever encountered in buffer hash table lookups.
|
|
.Nt
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|
.Sf st_hash_examined
|
|
Total number of hash elements traversed during hash table lookups.
|
|
.Nt
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|
.Sf st_page_clean
|
|
Clean pages currently in the cache.
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|
.Nt
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|
.Sf st_page_dirty
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|
Dirty pages currently in the cache.
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|
.Nt
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|
.Sf st_page_trickle
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|
Dirty pages written using the
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|
.I memp_trickle
|
|
interface.
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|
.PP
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|
.ie '\*[TYPE]'CXX'\{\
|
|
If
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|
.I fsp
|
|
is non-NULL,
|
|
a pointer to a NULL-terminated variable length array of statistics for
|
|
individual files
|
|
in the memory pool
|
|
is copied into the memory location it references.
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|
If no individual files currently exist in the memory pool,
|
|
.I fsp
|
|
will be set to NULL.
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|
.PP
|
|
The per-file statistics are stored in structures of type
|
|
DB_MPOOL_FSTAT (typedef'd in <db_cxx.h>).
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|
The following DB_MPOOL_FSTAT fields will be filled in for each file in the
|
|
pool, i.e., each element of the array:
|
|
.TP 5
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|
char *file_name;
|
|
The name of the file.
|
|
.Nt
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|
size_t st_pagesize;
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|
\}
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|
.el\{\
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|
The
|
|
.I fstat
|
|
method creates an array of DbMpoolFStat objects containing
|
|
statistics for individual files in the pool. Each DbMpoolFStat
|
|
object contains statistics for an individual DbMpoolFile, and
|
|
the statistics can be accessed via methods:
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|
.TP 5
|
|
String get_file_name();
|
|
The name of the file.
|
|
.Nt
|
|
long get_st_pagesize();
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|
\}
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|
Page size in bytes.
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|
.Nt
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|
.Sf st_cache_hit
|
|
Requested pages found in the cache.
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|
.Nt
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|
.Sf st_cache_miss
|
|
Requested pages not found in the cache.
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|
.Nt
|
|
.Sf st_map
|
|
Requested pages mapped into the process' address space.
|
|
.Nt
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|
.Sf st_page_create
|
|
Pages created in the cache.
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|
.Nt
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|
.Sf st_page_in
|
|
Pages read into the cache.
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|
.Nt
|
|
.Sf st_page_out
|
|
Pages written from the cache to the backing file.
|
|
.PP
|
|
.Rt DbMpool::stat
|
|
.SH "ENVIRONMENT VARIABLES"
|
|
The following environment variables affect the behavior of
|
|
.IR DbMpoolFile :
|
|
.TP 5
|
|
.Eh DbMpool::open
|
|
.TP 5
|
|
.Ev "memory pool" DbMpool
|
|
.SH ERRORS
|
|
.Ek
|
|
.if '\*[TYPE]'CXX'\{\
|
|
.PP
|
|
.Ee DbMpool::open
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|
.na
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|
.Nh
|
|
DBmemp->pgin(3),
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|
DBmemp->pgout(3),
|
|
DbLog::compare(3),
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|
DbLog::flush(3),
|
|
DbMpool::close(3),
|
|
DbMpool::unlink(3),
|
|
close(2),
|
|
db_version(3),
|
|
fcntl(2),
|
|
fflush(3),
|
|
fsync(2),
|
|
lseek(2),
|
|
malloc(3),
|
|
memcmp(3),
|
|
memcpy(3),
|
|
memset(3),
|
|
mmap(2),
|
|
munmap(2),
|
|
open(2),
|
|
sigfillset(3),
|
|
sigprocmask(2),
|
|
stat(2),
|
|
strcpy(3),
|
|
strdup(3),
|
|
strerror(3),
|
|
strlen(3),
|
|
time(3),
|
|
unlink(2),
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|
and
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|
write(2).
|
|
.Hy
|
|
.ad
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|
.PP
|
|
.Ec DbMpool::open
|
|
.TP 5
|
|
.Em
|
|
.TP 5
|
|
.Ei
|
|
.sp
|
|
.Et
|
|
.sp
|
|
A NULL pathname was specified without the DB_MPOOL_PRIVATE flag.
|
|
.sp
|
|
The specified cache size was impossibly small.
|
|
.PP
|
|
.Ee DbMpool::close
|
|
.na
|
|
.Nh
|
|
DbMpoolFile::close(3),
|
|
close(2),
|
|
fcntl(2),
|
|
fflush(3),
|
|
munmap(2),
|
|
and
|
|
strerror(3).
|
|
.Hy
|
|
.ad
|
|
.PP
|
|
.Ee DbMpool::unlink
|
|
.na
|
|
.Nh
|
|
close(2),
|
|
fcntl(2),
|
|
fflush(3),
|
|
malloc(3),
|
|
memcpy(3),
|
|
memset(3),
|
|
mmap(2),
|
|
munmap(2),
|
|
open(2),
|
|
sigfillset(3),
|
|
sigprocmask(2),
|
|
stat(2),
|
|
strcpy(3),
|
|
strdup(3),
|
|
strerror(3),
|
|
strlen(3),
|
|
and
|
|
unlink(2).
|
|
.Hy
|
|
.ad
|
|
.PP
|
|
.Ec DbMpool::unlink
|
|
.TP 5
|
|
.Eb
|
|
.PP
|
|
.Ee DbMpool::db_register
|
|
.na
|
|
.Nh
|
|
fcntl(2),
|
|
and
|
|
malloc(3).
|
|
.Hy
|
|
.ad
|
|
\}
|
|
.PP
|
|
.Ee DbMpool::trickle
|
|
.na
|
|
.Nh
|
|
DBmemp->pgin(3),
|
|
DBmemp->pgout(3),
|
|
DbLog::compare(3),
|
|
DbLog::flush(3),
|
|
close(2),
|
|
fcntl(2),
|
|
fflush(3),
|
|
fsync(2),
|
|
lseek(2),
|
|
malloc(3),
|
|
memcmp(3),
|
|
memcpy(3),
|
|
memset(3),
|
|
mmap(2),
|
|
open(2),
|
|
sigfillset(3),
|
|
sigprocmask(2),
|
|
stat(2),
|
|
strcpy(3),
|
|
strdup(3),
|
|
strerror(3),
|
|
strlen(3),
|
|
time(3),
|
|
unlink(2),
|
|
and
|
|
write(2).
|
|
.Hy
|
|
.ad
|
|
.PP
|
|
.Ec DbMpool::trickle
|
|
.TP 5
|
|
.Ei
|
|
.if '\*[TYPE]'CXX'\{\
|
|
.PP
|
|
.Ee DbMpool::sync
|
|
.na
|
|
.Nh
|
|
DBmemp->pgin(3),
|
|
DBmemp->pgout(3),
|
|
DbLog::compare(3),
|
|
DbLog::flush(3),
|
|
close(2),
|
|
fcntl(2),
|
|
fflush(3),
|
|
fsync(2),
|
|
lseek(2),
|
|
malloc(3),
|
|
memcmp(3),
|
|
memcpy(3),
|
|
memset(3),
|
|
mmap(2),
|
|
open(2),
|
|
qsort(3),
|
|
realloc(3),
|
|
sigfillset(3),
|
|
sigprocmask(2),
|
|
stat(2),
|
|
strcpy(3),
|
|
strdup(3),
|
|
strerror(3),
|
|
strlen(3),
|
|
time(3),
|
|
unlink(2),
|
|
and
|
|
write(2).
|
|
.Hy
|
|
.ad
|
|
.PP
|
|
.Ec DbMpool::sync
|
|
.TP 5
|
|
.Ei
|
|
.sp
|
|
The
|
|
.I DbMpool::sync
|
|
method was called without logging having been initialized in the environment.
|
|
\}
|
|
.PP
|
|
.Ee DbMpool::stat
|
|
.na
|
|
.Nh
|
|
fcntl(2),
|
|
malloc(3),
|
|
memcpy(3),
|
|
and
|
|
strlen(3).
|
|
.Hy
|
|
.ad
|
|
.SH "SEE ALSO"
|
|
.Sa
|