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181 строка
6.9 KiB
C
181 строка
6.9 KiB
C
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/* W3 Copyright statement
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Copyright 1995 by: Massachusetts Institute of Technology (MIT), INRIA</H2>
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This W3C software is being provided by the copyright holders under the
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following license. By obtaining, using and/or copying this software,
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you agree that you have read, understood, and will comply with the
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following terms and conditions:
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee or royalty is hereby
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granted, provided that the full text of this NOTICE appears on
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<EM>ALL</EM> copies of the software and documentation or portions
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thereof, including modifications, that you make.
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<B>THIS SOFTWARE IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE NO
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REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. BY WAY OF EXAMPLE,
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BUT NOT LIMITATION, COPYRIGHT HOLDERS MAKE NO REPRESENTATIONS OR
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WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR
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THAT THE USE OF THE SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY
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THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
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COPYRIGHT HOLDERS WILL BEAR NO LIABILITY FOR ANY USE OF THIS SOFTWARE
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OR DOCUMENTATION.
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The name and trademarks of copyright holders may NOT be used
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in advertising or publicity pertaining to the software without
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specific, written prior permission. Title to copyright in this
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software and any associated documentation will at all times remain
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with copyright holders.
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*/
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/* W3C Reference Library libwww Dynamic Memory Handlers
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DYNAMIC MEMORY HANDLERS
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*/
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/*
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** (c) COPYRIGHT MIT 1995.
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** Please first read the full copyright statement in the file COPYRIGH.
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*/
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/*
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This module defines any memory handler to be used by libwww for allocating and
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de-allocating dynamic memory. As dynamic memory may be a scarce resource, it is
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required that an application can handle memory exhaustion gracefully. This module
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provides an interface that covers the following situations:
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Handling of allocation, reallocation and de-allocation of dynamic memory
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Recovering from temporary lack of available memory
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Panic handling in case a new allocation fails
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_Note_: The Library _core_ provides a default set of memory handlers for allocating and
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de-allocating dynamic memory. In order to maintain a reasonable performance, they are
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not registered dynamically but assigned using _C style macros_. Hence, it is not
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possible to swap memory handler at run time but this was considered to be a reasonable
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trade-off.
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This module is implemented by HTMemory.c, and it is a part of the W3C Reference
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Library.
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*/
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#ifndef HTMEMORY_H
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#define HTMEMORY_H
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/*
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ALLOCATION, REALLOCATION AND DE-ALLOCATION
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The Library provides a default set of methods for handling dynamic memory. They are
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very basic and essentially identical to the C style malloc, calloc, realloc, and free:
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*/
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/* --- BEGIN added by mharmsen@netscape.com on 7/10/97 --- */
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#ifndef BOOL
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#define BOOL char
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#endif
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/* --- END added by mharmsen@netscape.com on 7/10/97 --- */
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extern void* HTMemory_malloc(size_t size);
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extern void* HTMemory_calloc(size_t count, size_t size);
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extern void* HTMemory_realloc(void * ptr, size_t size);
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extern void HTMemory_free(void* ptr);
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/*
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Memory Macros
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The methods above are not referred directly in the Library. Instead we use a set of C
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style macros. If you don't wany any memory management beyond normal malloc and alloc
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then you can just use that instead of the HTMemory_* function. You can of course also
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provide your own methods as well.
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*/
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#ifndef __FILE__
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#define __FILE__ ""
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#endif
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#ifndef __LINE__
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#define __LINE__ 0L
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#endif
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#define HT_MALLOC(size) HTMemory_malloc((size))
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#define HT_CALLOC(count, size) HTMemory_calloc((count), (size))
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#define HT_REALLOC(ptr, size) HTMemory_realloc((ptr), (size))
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#define HT_FREE(pointer) {HTMemory_free((pointer));((pointer))=NULL;}
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/*
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MEMORY FREER FUNCTIONS
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The dynamic memory freer functions are typically functions that are capable of freeing
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large chunks of memory. In case a new allocation fails, the allocation method looks for
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any registered freer functions to call. There can be multiple freer functions and after
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each call, the allocation method tries again to allocate the desired amount of dynamic
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memory. The freer functions are called in reverseorder meaning that the lastone
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registered gets called first. That way, it is easy to add temporary freer functions
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which then are guaranteed to be called first if a methods fails.
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Add a Freer Function
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You can add a freer function by using the following method. The Library may itself
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register a set of free functions during initialization. If the application does not
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register any freer functions then the Library looks how it can free internal memory.
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The freer function is passed the total number of _bytes_ requested by the allocation.
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*/
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typedef void (*HTMemoryCallback()); /* jhines -- 7/9/97 */
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/* typedef void HTMemoryCallback(size_t size); */
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extern BOOL HTMemoryCall_add (HTMemoryCallback * cbf);
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/*
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Delete a Freer Function
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Freer functions can be deleted at any time in which case they are not called anymore.
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*/
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extern BOOL HTMemoryCall_delete (HTMemoryCallback * cbf);
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extern BOOL HTMemoryCall_deleteAll (void);
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/*
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PANIC HANDLING
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If the freer functions are not capable of de-allocation enough memory then the
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application must have an organized way of closing down. This is done using the panic
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handler. In the libwww, each allocation is tested and HT_OUTOFMEMis called if a NULLwas
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returned. HT_OUTOFMEMis a macro which by default calls HTMemory_outofmem()but of course
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can point to any method. The default handler calls an exit function defined by the
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application in a call to HTMemory_setExit(). If the application has _not_ defined an
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exit function, HTMemory_outofmem()prints an error message and calls exit(1).
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*/
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typedef void HTMemory_exitCallback(char *name, char *file, unsigned long line);
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extern void HTMemory_setExit(HTMemory_exitCallback * pExit);
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extern HTMemory_exitCallback * HTMemory_exit(void);
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/*
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Call the Exit Handler
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If an allocation fails then this function is called. If the application has registered
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its own panic handler then this is called directly from this function. Otherwise, the
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default behavior is to write a small message to stderr and then exit.
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*/
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#define outofmem(file, name) HT_OUTOFMEM(name)
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#define HT_OUTOFMEM(name) HTMemory_outofmem((name), __FILE__, __LINE__)
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extern void HTMemory_outofmem(char * name, char * file, unsigned long line);
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/*
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*/
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#endif /* HTMEMORY_H */
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/*
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___________________________________
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@(#) $Id: htmemory.h,v 3.1 1998-03-28 03:32:07 ltabb Exp $
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*/
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