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/*
File: CAMutex.cpp
Abstract: CAMutex.h
Version: 1.1
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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 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.
Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
//==================================================================================================
// Includes
//==================================================================================================
// Self Include
#include "CAMutex.h"
#if TARGET_OS_MAC
#include <errno.h>
#endif
// PublicUtility Includes
#include "CADebugMacros.h"
#include "CAException.h"
#include "CAHostTimeBase.h"
//==================================================================================================
// Logging
//==================================================================================================
#if CoreAudio_Debug
// #define Log_Ownership 1
// #define Log_Errors 1
// #define Log_LongLatencies 1
// #define LongLatencyThreshholdNS 1000000ULL // nanoseconds
#endif
//==================================================================================================
// CAMutex
//==================================================================================================
CAMutex::CAMutex(const char* inName)
:
mName(inName),
mOwner(0)
{
#if TARGET_OS_MAC
OSStatus theError = pthread_mutex_init(&mMutex, NULL);
ThrowIf(theError != 0, CAException(theError), "CAMutex::CAMutex: Could not init the mutex");
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%p %.4f: CAMutex::CAMutex: creating %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), mName, mOwner);
#endif
#elif TARGET_OS_WIN32
mMutex = CreateMutex(NULL, false, NULL);
ThrowIfNULL(mMutex, CAException(GetLastError()), "CAMutex::CAMutex: could not create the mutex.");
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%lu %.4f: CAMutex::CAMutex: creating %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), mName, mOwner);
#endif
#endif
}
CAMutex::~CAMutex()
{
#if TARGET_OS_MAC
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%p %.4f: CAMutex::~CAMutex: destroying %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), mName, mOwner);
#endif
pthread_mutex_destroy(&mMutex);
#elif TARGET_OS_WIN32
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%lu %.4f: CAMutex::~CAMutex: destroying %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), mName, mOwner);
#endif
if(mMutex != NULL)
{
CloseHandle(mMutex);
}
#endif
}
bool CAMutex::Lock()
{
bool theAnswer = false;
#if TARGET_OS_MAC
pthread_t theCurrentThread = pthread_self();
if(!pthread_equal(theCurrentThread, mOwner))
{
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%p %.4f: CAMutex::Lock: thread %p is locking %s, owner: %p\n", theCurrentThread, ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), theCurrentThread, mName, mOwner);
#endif
#if Log_LongLatencies
UInt64 lockTryTime = CAHostTimeBase::GetCurrentTimeInNanos();
#endif
OSStatus theError = pthread_mutex_lock(&mMutex);
ThrowIf(theError != 0, CAException(theError), "CAMutex::Lock: Could not lock the mutex");
mOwner = theCurrentThread;
theAnswer = true;
#if Log_LongLatencies
UInt64 lockAcquireTime = CAHostTimeBase::GetCurrentTimeInNanos();
if (lockAcquireTime - lockTryTime >= LongLatencyThresholdNS)
DebugPrintfRtn(DebugPrintfFileComma "Thread %p took %.6fs to acquire the lock %s\n", theCurrentThread, (lockAcquireTime - lockTryTime) * 1.0e-9 /* nanos to seconds */, mName);
#endif
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%p %.4f: CAMutex::Lock: thread %p has locked %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), pthread_self(), mName, mOwner);
#endif
}
#elif TARGET_OS_WIN32
if(mOwner != GetCurrentThreadId())
{
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%lu %.4f: CAMutex::Lock: thread %lu is locking %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner);
#endif
OSStatus theError = WaitForSingleObject(mMutex, INFINITE);
ThrowIfError(theError, CAException(theError), "CAMutex::Lock: could not lock the mutex");
mOwner = GetCurrentThreadId();
theAnswer = true;
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%lu %.4f: CAMutex::Lock: thread %lu has locked %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner);
#endif
}
#endif
return theAnswer;
}
void CAMutex::Unlock()
{
#if TARGET_OS_MAC
if(pthread_equal(pthread_self(), mOwner))
{
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%p %.4f: CAMutex::Unlock: thread %p is unlocking %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), pthread_self(), mName, mOwner);
#endif
mOwner = 0;
OSStatus theError = pthread_mutex_unlock(&mMutex);
ThrowIf(theError != 0, CAException(theError), "CAMutex::Unlock: Could not unlock the mutex");
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%p %.4f: CAMutex::Unlock: thread %p has unlocked %s, owner: %p\n", pthread_self(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), pthread_self(), mName, mOwner);
#endif
}
else
{
DebugMessage("CAMutex::Unlock: A thread is attempting to unlock a Mutex it doesn't own");
}
#elif TARGET_OS_WIN32
if(mOwner == GetCurrentThreadId())
{
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%lu %.4f: CAMutex::Unlock: thread %lu is unlocking %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner);
#endif
mOwner = 0;
bool wasReleased = ReleaseMutex(mMutex);
ThrowIf(!wasReleased, CAException(GetLastError()), "CAMutex::Unlock: Could not unlock the mutex");
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%lu %.4f: CAMutex::Unlock: thread %lu has unlocked %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner);
#endif
}
else
{
DebugMessage("CAMutex::Unlock: A thread is attempting to unlock a Mutex it doesn't own");
}
#endif
}
bool CAMutex::Try(bool& outWasLocked)
{
bool theAnswer = false;
outWasLocked = false;
#if TARGET_OS_MAC
pthread_t theCurrentThread = pthread_self();
if(!pthread_equal(theCurrentThread, mOwner))
{
// this means the current thread doesn't already own the lock
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%p %.4f: CAMutex::Try: thread %p is try-locking %s, owner: %p\n", theCurrentThread, ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), theCurrentThread, mName, mOwner);
#endif
// go ahead and call trylock to see if we can lock it.
int theError = pthread_mutex_trylock(&mMutex);
if(theError == 0)
{
// return value of 0 means we successfully locked the lock
mOwner = theCurrentThread;
theAnswer = true;
outWasLocked = true;
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%p %.4f: CAMutex::Try: thread %p has locked %s, owner: %p\n", theCurrentThread, ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), theCurrentThread, mName, mOwner);
#endif
}
else if(theError == EBUSY)
{
// return value of EBUSY means that the lock was already locked by another thread
theAnswer = false;
outWasLocked = false;
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%p %.4f: CAMutex::Try: thread %p failed to lock %s, owner: %p\n", theCurrentThread, ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), theCurrentThread, mName, mOwner);
#endif
}
else
{
// any other return value means something really bad happenned
ThrowIfError(theError, CAException(theError), "CAMutex::Try: call to pthread_mutex_trylock failed");
}
}
else
{
// this means the current thread already owns the lock
theAnswer = true;
outWasLocked = false;
}
#elif TARGET_OS_WIN32
if(mOwner != GetCurrentThreadId())
{
// this means the current thread doesn't own the lock
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%lu %.4f: CAMutex::Try: thread %lu is try-locking %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner);
#endif
// try to acquire the mutex
OSStatus theError = WaitForSingleObject(mMutex, 0);
if(theError == WAIT_OBJECT_0)
{
// this means we successfully locked the lock
mOwner = GetCurrentThreadId();
theAnswer = true;
outWasLocked = true;
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%lu %.4f: CAMutex::Try: thread %lu has locked %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner);
#endif
}
else if(theError == WAIT_TIMEOUT)
{
// this means that the lock was already locked by another thread
theAnswer = false;
outWasLocked = false;
#if Log_Ownership
DebugPrintfRtn(DebugPrintfFileComma "%lu %.4f: CAMutex::Try: thread %lu failed to lock %s, owner: %lu\n", GetCurrentThreadId(), ((Float64)(CAHostTimeBase::GetCurrentTimeInNanos()) / 1000000.0), GetCurrentThreadId(), mName, mOwner);
#endif
}
else
{
// any other return value means something really bad happenned
ThrowIfError(theError, CAException(GetLastError()), "CAMutex::Try: call to lock the mutex failed");
}
}
else
{
// this means the current thread already owns the lock
theAnswer = true;
outWasLocked = false;
}
#endif
return theAnswer;
}
bool CAMutex::IsFree() const
{
return mOwner == 0;
}
bool CAMutex::IsOwnedByCurrentThread() const
{
bool theAnswer = true;
#if TARGET_OS_MAC
theAnswer = pthread_equal(pthread_self(), mOwner);
#elif TARGET_OS_WIN32
theAnswer = (mOwner == GetCurrentThreadId());
#endif
return theAnswer;
}
CAMutex::Unlocker::Unlocker(CAMutex& inMutex)
: mMutex(inMutex),
mNeedsLock(false)
{
Assert(mMutex.IsOwnedByCurrentThread(), "Major problem: Unlocker attempted to unlock a mutex not owned by the current thread!");
mMutex.Unlock();
mNeedsLock = true;
}
CAMutex::Unlocker::~Unlocker()
{
if(mNeedsLock)
{
mMutex.Lock();
}
}
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