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livetrax/libs/appleutility/CoreAudio/PublicUtility/CAGuard.cpp

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/*
File: CAGuard.cpp
Abstract: CAGuard.h
Version: 1.1
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Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
//==================================================================================================
// 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(DebugPrintfFileComma "%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(DebugPrintfFileComma "%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(DebugPrintfFileComma "%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(DebugPrintfFileComma "%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 = static_cast<long>(inNanos / kNanosPerSecond);
theTimeSpec.tv_nsec = static_cast<long>(inNanos % kNanosPerSecond);
}
else
{
theTimeSpec.tv_sec = 0;
theTimeSpec.tv_nsec = static_cast<long>(inNanos);
}
#if Log_TimedWaits || Log_Latency || Log_Average_Latency
UInt64 theStartNanos = CAHostTimeBase::GetCurrentTimeInNanos();
#endif
mOwner = 0;
#if Log_WaitOwnership
DebugPrintfRtn(DebugPrintfFileComma "%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(DebugPrintfFileComma "%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(DebugPrintfFileComma "%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);
// This mutex should be locked again when time out happens.rdar://12270555
if(theError == WAIT_TIMEOUT) {
DWORD dwError = WaitForSingleObject(mMutex, INFINITE);
ThrowIf((dwError != WAIT_OBJECT_0), CAException(GetLastError()), "CAGuard::WaitFor: failed to acquire the mutex back when timeout happened\n");
}
#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(DebugPrintfFileComma "%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);
}
else
{
#if Log_Errors
DebugMessageN2("CAGuard::WaitUntil: Time has expired before waiting, now: %.0f, requested: %.0f", (double)theCurrentNanos, (double)inNanos);
#endif
theAnswer = true;
}
return theAnswer;
}
void CAGuard::Notify()
{
#if TARGET_OS_MAC
#if Log_WaitOwnership
DebugPrintfRtn(DebugPrintfFileComma "%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(DebugPrintfFileComma "%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(DebugPrintfFileComma "%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(DebugPrintfFileComma "%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
}