Cider Isn't Darwin Emulation, Really
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in consideration of your agreement to the following terms, and your use, installation, modification or redistribution of this Apple software constitutes acceptance of these terms. If you do not agree with these terms, please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject to these terms, Apple grants you a personal, non-exclusive license, under Apple�s copyrights in this original Apple software (the "Apple Software"), to use, reproduce, modify and redistribute the Apple Software, with or without modifications, in source and/or binary forms; provided that if you redistribute the Apple Software in its entirety and without modifications, you must retain this notice and the following text and disclaimers in all such redistributions of the Apple Software. Neither the name, trademarks, service marks or logos of Apple Computer, Inc. may be used to endorse or promote products derived from the Apple Software without specific prior written permission from Apple. Except as expressly stated in this notice, no other rights or licenses, express or implied, are granted by Apple herein, including but not limited to any patent rights that may be infringed by your derivative works or by other works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.*//*================================================================================================== CAGuard.cpp
==================================================================================================*/
//==================================================================================================// Includes//==================================================================================================
// Self Include#include "CAGuard.h"
#if TARGET_OS_MAC #include <errno.h>#endif
// PublicUtility Inludes#include "CADebugMacros.h"#include "CAException.h"#include "CAHostTimeBase.h"
//==================================================================================================// Logging//==================================================================================================
#if CoreAudio_Debug// #define Log_Ownership 1// #define Log_WaitOwnership 1// #define Log_TimedWaits 1// #define Log_Latency 1// #define Log_Errors 1#endif
//#warning Need a try-based Locker too//==================================================================================================// CAGuard//==================================================================================================
CAGuard::CAGuard(const char* inName): CAMutex(inName)#if Log_Average_Latency ,mAverageLatencyAccumulator(0.0), mAverageLatencyCount(0)#endif{#if TARGET_OS_MAC OSStatus theError = pthread_cond_init(&mCondVar, NULL); ThrowIf(theError != 0, CAException(theError), "CAGuard::CAGuard: Could not init the cond var");#elif TARGET_OS_WIN32 mEvent = CreateEvent(NULL, true, false, NULL); ThrowIfNULL(mEvent, CAException(GetLastError()), "CAGuard::CAGuard: Could not create the event");#endif}
CAGuard::~CAGuard(){#if TARGET_OS_MAC pthread_cond_destroy(&mCondVar);#elif TARGET_OS_WIN32 if(mEvent != NULL) { CloseHandle(mEvent); }#endif}
void CAGuard::Wait(){#if TARGET_OS_MAC ThrowIf(!pthread_equal(pthread_self(), mOwner), CAException(1), "CAGuard::Wait: A thread has to have locked a guard before it can wait");
mOwner = 0;
#if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%p %.4f: CAGuard::Wait: thread %p is waiting on %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), pthread_self(), mName, mOwner); #endif
OSStatus theError = pthread_cond_wait(&mCondVar, &mMutex); ThrowIf(theError != 0, CAException(theError), "CAGuard::Wait: Could not wait for a signal"); mOwner = pthread_self();
#if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%p %.4f: CAGuard::Wait: thread %p waited on %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), pthread_self(), mName, mOwner); #endif#elif TARGET_OS_WIN32 ThrowIf(GetCurrentThreadId() != mOwner, CAException(1), "CAGuard::Wait: A thread has to have locked a guard before it can wait");
mOwner = 0;
#if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%lu %.4f: CAGuard::Wait: thread %lu is waiting on %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner); #endif
ReleaseMutex(mMutex); HANDLE theHandles[] = { mMutex, mEvent }; OSStatus theError = WaitForMultipleObjects(2, theHandles, true, INFINITE); ThrowIfError(theError, CAException(GetLastError()), "CAGuard::Wait: Could not wait for the signal"); mOwner = GetCurrentThreadId(); ResetEvent(mEvent);
#if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%lu %.4f: CAGuard::Wait: thread %lu waited on %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner); #endif#endif}
bool CAGuard::WaitFor(UInt64 inNanos){ bool theAnswer = false;
#if TARGET_OS_MAC ThrowIf(!pthread_equal(pthread_self(), mOwner), CAException(1), "CAGuard::WaitFor: A thread has to have locked a guard be for it can wait");
#if Log_TimedWaits DebugMessageN1("CAGuard::WaitFor: waiting %.0f", (Float64)inNanos); #endif
struct timespec theTimeSpec; static const UInt64 kNanosPerSecond = 1000000000ULL; if(inNanos > kNanosPerSecond) { theTimeSpec.tv_sec = inNanos / kNanosPerSecond; theTimeSpec.tv_nsec = inNanos % kNanosPerSecond; } else { theTimeSpec.tv_sec = 0; theTimeSpec.tv_nsec = inNanos; } #if Log_TimedWaits || Log_Latency || Log_Average_Latency UInt64 theStartNanos = CAHostTimeBase::GetCurrentTimeInNanos(); #endif
mOwner = 0;
#if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%p %.4f: CAGuard::WaitFor: thread %p is waiting on %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), pthread_self(), mName, mOwner); #endif
OSStatus theError = pthread_cond_timedwait_relative_np(&mCondVar, &mMutex, &theTimeSpec); ThrowIf((theError != 0) && (theError != ETIMEDOUT), CAException(theError), "CAGuard::WaitFor: Wait got an error"); mOwner = pthread_self(); #if Log_TimedWaits || Log_Latency || Log_Average_Latency UInt64 theEndNanos = CAHostTimeBase::GetCurrentTimeInNanos(); #endif #if Log_TimedWaits DebugMessageN1("CAGuard::WaitFor: waited %.0f", (Float64)(theEndNanos - theStartNanos)); #endif #if Log_Latency DebugMessageN1("CAGuard::WaitFor: latency %.0f", (Float64)((theEndNanos - theStartNanos) - inNanos)); #endif #if Log_Average_Latency ++mAverageLatencyCount; mAverageLatencyAccumulator += (theEndNanos - theStartNanos) - inNanos; if(mAverageLatencyCount >= 50) { DebugMessageN2("CAGuard::WaitFor: average latency %.3f ns over %ld waits", mAverageLatencyAccumulator / mAverageLatencyCount, mAverageLatencyCount); mAverageLatencyCount = 0; mAverageLatencyAccumulator = 0.0; } #endif
#if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%p %.4f: CAGuard::WaitFor: thread %p waited on %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), pthread_self(), mName, mOwner); #endif
theAnswer = theError == ETIMEDOUT;#elif TARGET_OS_WIN32 ThrowIf(GetCurrentThreadId() != mOwner, CAException(1), "CAGuard::WaitFor: A thread has to have locked a guard be for it can wait");
#if Log_TimedWaits DebugMessageN1("CAGuard::WaitFor: waiting %.0f", (Float64)inNanos); #endif
// the time out is specified in milliseconds(!) UInt32 theWaitTime = static_cast<UInt32>(inNanos / 1000000ULL);
#if Log_TimedWaits || Log_Latency || Log_Average_Latency UInt64 theStartNanos = CAHostTimeBase::GetCurrentTimeInNanos(); #endif
mOwner = 0;
#if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%lu %.4f: CAGuard::WaitFor: thread %lu is waiting on %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner); #endif ReleaseMutex(mMutex); HANDLE theHandles[] = { mMutex, mEvent }; OSStatus theError = WaitForMultipleObjects(2, theHandles, true, theWaitTime); ThrowIf((theError != WAIT_OBJECT_0) && (theError != WAIT_TIMEOUT), CAException(GetLastError()), "CAGuard::WaitFor: Wait got an error"); mOwner = GetCurrentThreadId(); ResetEvent(mEvent); #if Log_TimedWaits || Log_Latency || Log_Average_Latency UInt64 theEndNanos = CAHostTimeBase::GetCurrentTimeInNanos(); #endif #if Log_TimedWaits DebugMessageN1("CAGuard::WaitFor: waited %.0f", (Float64)(theEndNanos - theStartNanos)); #endif #if Log_Latency DebugMessageN1("CAGuard::WaitFor: latency %.0f", (Float64)((theEndNanos - theStartNanos) - inNanos)); #endif #if Log_Average_Latency ++mAverageLatencyCount; mAverageLatencyAccumulator += (theEndNanos - theStartNanos) - inNanos; if(mAverageLatencyCount >= 50) { DebugMessageN2("CAGuard::WaitFor: average latency %.3f ns over %ld waits", mAverageLatencyAccumulator / mAverageLatencyCount, mAverageLatencyCount); mAverageLatencyCount = 0; mAverageLatencyAccumulator = 0.0; } #endif
#if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%lu %.4f: CAGuard::WaitFor: thread %lu waited on %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner); #endif
theAnswer = theError == WAIT_TIMEOUT;#endif
return theAnswer;}
bool CAGuard::WaitUntil(UInt64 inNanos){ bool theAnswer = false; UInt64 theCurrentNanos = CAHostTimeBase::GetCurrentTimeInNanos(); #if Log_TimedWaits DebugMessageN2("CAGuard::WaitUntil: now: %.0f, requested: %.0f", (double)theCurrentNanos, (double)inNanos);#endif if(inNanos > theCurrentNanos) {#if Log_Errors if((inNanos - theCurrentNanos) > 1000000000ULL) { DebugMessage("CAGuard::WaitUntil: about to wait for more than a second"); }#endif theAnswer = WaitFor(inNanos - theCurrentNanos); }#if Log_Errors else { DebugMessageN2("CAGuard::WaitUntil: Time has expired before waiting, now: %.0f, requested: %.0f", (double)theCurrentNanos, (double)inNanos); }#endif
return theAnswer;}
void CAGuard::Notify(){#if TARGET_OS_MAC #if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%p %.4f: CAGuard::Notify: thread %p is notifying %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), pthread_self(), mName, mOwner); #endif
OSStatus theError = pthread_cond_signal(&mCondVar); ThrowIf(theError != 0, CAException(theError), "CAGuard::Notify: failed");#elif TARGET_OS_WIN32 #if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%lu %.4f: CAGuard::Notify: thread %lu is notifying %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner); #endif SetEvent(mEvent);#endif}
void CAGuard::NotifyAll(){#if TARGET_OS_MAC #if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%p %.4f: CAGuard::NotifyAll: thread %p is notifying %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), pthread_self(), mName, mOwner); #endif
OSStatus theError = pthread_cond_broadcast(&mCondVar); ThrowIf(theError != 0, CAException(theError), "CAGuard::NotifyAll: failed");#elif TARGET_OS_WIN32 #if Log_WaitOwnership DebugPrintfRtn(DebugPrintfFile, "%lu %.4f: CAGuard::NotifyAll: thread %lu is notifying %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner); #endif SetEvent(mEvent);#endif}