зеркало из https://github.com/mozilla/gecko-dev.git
106 строки
3.3 KiB
C
106 строки
3.3 KiB
C
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2001 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*
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* $Id: sslmutex.h,v 1.2 2001/06/12 01:10:01 nelsonb%netscape.com Exp $
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*/
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#ifndef __SSLMUTEX_H_
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#define __SSLMUTEX_H_ 1
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/* What SSL really wants is portable process-shared unnamed mutexes in
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* shared memory, that have the property that if the process that holds
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* them dies, they are released automatically, and that (unlike fcntl
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* record locking) lock to the thread, not to the process.
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* NSPR doesn't provide that.
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* Windows has mutexes that meet that description, but they're not portable.
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* POSIX mutexes are not automatically released when the holder dies,
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* and other processes/threads cannot release the mutex on behalf of the
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* dead holder.
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* POSIX semaphores can be used to accomplish this on systems that implement
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* process-shared unnamed POSIX semaphores, because a watchdog thread can
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* discover and release semaphores that were held by a dead process.
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* On systems that do not support process-shared POSIX unnamed semaphores,
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* they can be emulated using pipes.
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* The performance cost of doing that is not yet measured.
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*
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* So, this API looks a lot like POSIX pthread mutexes.
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*/
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#if defined(WIN32)
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#include <wtypes.h>
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typedef HANDLE sslMutex;
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typedef int sslPID;
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#elif defined(LINUX) || defined(AIX)
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#include <sys/types.h>
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#include "prtypes.h"
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typedef struct {
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int mPipes[3];
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PRInt32 nWaiters;
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} sslMutex;
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typedef pid_t sslPID;
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#elif defined(XP_UNIX) /* other types of Unix */
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#include <sys/types.h> /* for pid_t */
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#include <semaphore.h> /* for sem_t, and sem_* functions */
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typedef sem_t sslMutex;
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typedef pid_t sslPID;
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#else
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/* what platform is this ?? */
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typedef int sslMutex;
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typedef int sslPID;
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#endif
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#include "seccomon.h"
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SEC_BEGIN_PROTOS
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extern SECStatus sslMutex_Init(sslMutex *sem, int shared);
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extern SECStatus sslMutex_Destroy(sslMutex *sem);
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extern SECStatus sslMutex_Unlock(sslMutex *sem);
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extern SECStatus sslMutex_Lock(sslMutex *sem);
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SEC_END_PROTOS
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#endif
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