зеркало из https://github.com/mozilla/pjs.git
156 строки
4.5 KiB
C
156 строки
4.5 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All 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 terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* $Id: sslmutex.h,v 1.12 2009/06/05 02:34:15 nelson%bolyard.com Exp $ */
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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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#include "prtypes.h"
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#include "prlock.h"
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#if defined(NETBSD)
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#include <sys/param.h> /* for __NetBSD_Version__ */
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#endif
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#if defined(WIN32)
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#include <wtypes.h>
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typedef struct
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{
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PRBool isMultiProcess;
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#ifdef WINNT
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/* on WINNT we need both the PRLock and the Win32 mutex for fibers */
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struct {
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#else
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union {
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#endif
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PRLock* sslLock;
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HANDLE sslMutx;
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} u;
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} sslMutex;
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typedef int sslPID;
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#elif defined(LINUX) || defined(AIX) || defined(BEOS) || defined(BSDI) || (defined(NETBSD) && __NetBSD_Version__ < 500000000) || defined(OPENBSD)
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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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PRBool isMultiProcess;
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union {
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PRLock* sslLock;
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struct {
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int mPipes[3];
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PRInt32 nWaiters;
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} pipeStr;
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} u;
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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 struct
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{
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PRBool isMultiProcess;
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union {
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PRLock* sslLock;
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sem_t sem;
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} u;
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} 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 struct {
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PRBool isMultiProcess;
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union {
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PRLock* sslLock;
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/* include cross-process locking mechanism here */
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} u;
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} 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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#ifdef WINNT
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extern SECStatus sslMutex_2LevelInit(sslMutex *sem);
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#endif
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SEC_END_PROTOS
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#endif
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