158 lines
3.9 KiB
C++
158 lines
3.9 KiB
C++
/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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/*
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File: OSMutex.cpp
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Contains: Platform - independent mutex header. The implementation of this object
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is platform - specific. Each platform must define an independent
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QTSSMutex.h & QTSSMutex.cpp file.
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This file is for Mac OS X Server only
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*/
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#include "OSMutex.h"
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#include <stdlib.h>
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#include "SafeStdLib.h"
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#include <string.h>
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// Private globals
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#if __PTHREADS_MUTEXES__
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static pthread_mutexattr_t *sMutexAttr=NULL;
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static void MutexAttrInit();
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#if __solaris__
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static pthread_once_t sMutexAttrInit = {PTHREAD_ONCE_INIT};
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#else
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static pthread_once_t sMutexAttrInit = PTHREAD_ONCE_INIT;
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#endif
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#endif
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OSMutex::OSMutex()
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{
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#ifdef __Win32__
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::InitializeCriticalSection(&fMutex);
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fHolder = 0;
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fHolderCount = 0;
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#elif __PTHREADS_MUTEXES__
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(void)pthread_once(&sMutexAttrInit, MutexAttrInit);
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(void)pthread_mutex_init(&fMutex, sMutexAttr);
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fHolder = 0;
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fHolderCount = 0;
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#else
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fMutex = mymutex_alloc();
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#endif
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}
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#if __PTHREADS_MUTEXES__
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void MutexAttrInit()
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{
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sMutexAttr = (pthread_mutexattr_t*)malloc(sizeof(pthread_mutexattr_t));
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::memset(sMutexAttr, 0, sizeof(pthread_mutexattr_t));
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pthread_mutexattr_init(sMutexAttr);
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}
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#endif
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OSMutex::~OSMutex()
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{
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#ifdef __Win32__
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::DeleteCriticalSection(&fMutex);
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#elif __PTHREADS_MUTEXES__
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pthread_mutex_destroy(&fMutex);
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#else
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mymutex_free(fMutex);
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#endif
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}
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#if __PTHREADS_MUTEXES__ || __Win32__
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void OSMutex::RecursiveLock()
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{
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// We already have this mutex. Just refcount and return
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if (OSThread::GetCurrentThreadID() == fHolder)
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{
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fHolderCount++;
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return;
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}
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#ifdef __Win32__
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::EnterCriticalSection(&fMutex);
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#else
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(void)pthread_mutex_lock(&fMutex);
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#endif
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Assert(fHolder == 0);
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fHolder = OSThread::GetCurrentThreadID();
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fHolderCount++;
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Assert(fHolderCount == 1);
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}
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void OSMutex::RecursiveUnlock()
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{
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if (OSThread::GetCurrentThreadID() != fHolder)
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return;
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Assert(fHolderCount > 0);
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fHolderCount--;
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if (fHolderCount == 0)
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{
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fHolder = 0;
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#ifdef __Win32__
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::LeaveCriticalSection(&fMutex);
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#else
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pthread_mutex_unlock(&fMutex);
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#endif
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}
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}
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Bool16 OSMutex::RecursiveTryLock()
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{
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// We already have this mutex. Just refcount and return
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if (OSThread::GetCurrentThreadID() == fHolder)
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{
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fHolderCount++;
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return true;
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}
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#ifdef __Win32__
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Bool16 theErr = (Bool16)::TryEnterCriticalSection(&fMutex); // Return values of this function match our API
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if (!theErr)
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return theErr;
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#else
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int theErr = pthread_mutex_trylock(&fMutex);
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if (theErr != 0)
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{
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Assert(theErr == EBUSY);
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return false;
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}
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#endif
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Assert(fHolder == 0);
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fHolder = OSThread::GetCurrentThreadID();
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fHolderCount++;
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Assert(fHolderCount == 1);
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return true;
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}
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#endif //__PTHREADS_MUTEXES__ || __Win32__
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