129 lines
3.3 KiB
C++
129 lines
3.3 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: OSCond.h
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Contains: A simple condition variable abstraction
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*/
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#ifndef _OSCOND_H_
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#define _OSCOND_H_
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#ifndef __Win32__
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#if __PTHREADS_MUTEXES__
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#include <pthread.h>
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#else
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#include "mycondition.h"
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#endif
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#endif
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#include "OSMutex.h"
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#include "MyAssert.h"
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class OSCond
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{
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public:
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OSCond();
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~OSCond();
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inline void Signal();
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inline void Wait(OSMutex* inMutex, SInt32 inTimeoutInMilSecs = 0);
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inline void Broadcast();
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private:
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#ifdef __Win32__
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HANDLE fCondition;
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UInt32 fWaitCount;
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#elif __PTHREADS_MUTEXES__
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pthread_cond_t fCondition;
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void TimedWait(OSMutex* inMutex, SInt32 inTimeoutInMilSecs);
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#else
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mycondition_t fCondition;
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#endif
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};
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inline void OSCond::Wait(OSMutex* inMutex, SInt32 inTimeoutInMilSecs)
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{
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#ifdef __Win32__
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DWORD theTimeout = INFINITE;
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if (inTimeoutInMilSecs > 0)
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theTimeout = inTimeoutInMilSecs;
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inMutex->Unlock();
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fWaitCount++;
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DWORD theErr = ::WaitForSingleObject(fCondition, theTimeout);
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fWaitCount--;
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Assert((theErr == WAIT_OBJECT_0) || (theErr == WAIT_TIMEOUT));
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inMutex->Lock();
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#elif __PTHREADS_MUTEXES__
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this->TimedWait(inMutex, inTimeoutInMilSecs);
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#else
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Assert(fCondition != NULL);
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mycondition_wait(fCondition, inMutex->fMutex, inTimeoutInMilSecs);
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#endif
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}
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inline void OSCond::Signal()
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{
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#ifdef __Win32__
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BOOL theErr = ::SetEvent(fCondition);
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Assert(theErr == TRUE);
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#elif __PTHREADS_MUTEXES__
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pthread_cond_signal(&fCondition);
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#else
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Assert(fCondition != NULL);
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mycondition_signal(fCondition);
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#endif
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}
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inline void OSCond::Broadcast()
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{
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#ifdef __Win32__
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//
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// There doesn't seem like any more elegant way to
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// implement Broadcast using events in Win32.
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// This will work, it may generate spurious wakeups,
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// but condition variables are allowed to generate
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// spurious wakeups
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UInt32 waitCount = fWaitCount;
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for (UInt32 x = 0; x < waitCount; x++)
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{
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BOOL theErr = ::SetEvent(fCondition);
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Assert(theErr == TRUE);
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}
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#elif __PTHREADS_MUTEXES__
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pthread_cond_broadcast(&fCondition);
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#else
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Assert(fCondition != NULL);
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mycondition_broadcast(fCondition);
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#endif
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}
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#endif //_OSCOND_H_
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