C++ LockMut函数代码示例

	static OSStatus VolumesChanged( EventHandlerCallRef ref, EventRef event, void *p )
	{
		MemoryCardDriverThreaded_MacOSX *driver = (MemoryCardDriverThreaded_MacOSX *)p;
		LockMut( driver->m_ChangedLock );
		driver->m_bChanged = true;
		return eventNotHandledErr; // let others do something
	}

bool BackgroundLoader::IsCacheFileFinished( const CString &sFile, CString &sActualPath )
{
    if( !g_bEnableBackgroundLoading )
    {
        sActualPath = sFile;
        return true;
    }

    LockMut( m_Mutex );

    if( sFile == "" )
    {
        sActualPath = "";
        return true;
    }

    map<CString,int>::iterator it;
    it = m_FinishedRequests.find( sFile );
    if( it == m_FinishedRequests.end() )
        return false;

    LOG->Trace("XXX: %s finished (%i)", sFile.c_str(), it->second);
    if( g_bWriteToCache )
        sActualPath = GetCachePath( sFile );
    else
        sActualPath = sFile;

    return true;
}

bool VirtualMemoryManager::EnsureFreeMemory(size_t size)
{
	if(!inited)
		return false;

	LockMut(vmemMutex);

	MEMORYSTATUS ms;
	GlobalMemoryStatus(&ms);

	while(ms.dwAvailPhys < size)
	{
		if(LOG && logging)
			LOG->Trace("Freeing memory: need %i, have %i", size, ms.dwAvailPhys);

		if(!DecommitLRU())
		{
			if(LOG)
				LOG->Trace("VMem error: No pages left to free while reserving memory");
			return false;
		}
	}

	return true;
}

void RageFileManager::GetDirListing( CString sPath, CStringArray &AddTo, bool bOnlyDirs, bool bReturnPathToo )
{
	LockMut( *g_Mutex );

	NormalizePath( sPath );
	
	for( unsigned i = 0; i < g_Drivers.size(); ++i )
	{
		LoadedDriver &ld = g_Drivers[i];
		const CString p = ld.GetPath( sPath );
		if( p.size() == 0 )
			continue;

		const unsigned OldStart = AddTo.size();
		
		g_Drivers[i].driver->GetDirListing( p, AddTo, bOnlyDirs, bReturnPathToo );

		/* If returning the path, prepend the mountpoint name to the files this driver returned. */
		if( bReturnPathToo )
			for( unsigned j = OldStart; j < AddTo.size(); ++j )
				AddTo[j] = ld.MountPoint + AddTo[j];
	}

	/* More than one driver might return the same file.  Remove duplicates (case-
	 * insensitively). */
	sort( AddTo.begin(), AddTo.end(), ilt );
	CStringArray::iterator it = unique( AddTo.begin(), AddTo.end(), ieq );
	AddTo.erase(it, AddTo.end());
}

RageFileObj *RageFileDriverMem::Open( const CString &sPath, int mode, RageFile &p, int &err )
{
	LockMut(m_Mutex);

	if( mode == RageFile::WRITE )
	{
		/* If the file exists, delete it. */
		Remove( sPath );

		RageFileObjMemFile *pFile = new RageFileObjMemFile;

		m_Files.push_back( pFile );
		FDB->AddFile( sPath, 0, 0, pFile );

		return new RageFileObjMem( pFile, p );
	}

	RageFileObjMemFile *pFile = (RageFileObjMemFile *) FDB->GetFilePriv( sPath );
	if( pFile == NULL )
	{
		err = ENOENT;
		return NULL;
	}

	return new RageFileObjMem( pFile, p );
}

void RageSound_Generic_Software::StopMixing( RageSoundBase *snd )
{
	/* Lock, to make sure the decoder thread isn't running on this sound while we do this. */
	LockMut( m_Mutex );

	/* Find the sound. */
	unsigned i;
	for( i = 0; i < ARRAYSIZE(sounds); ++i )
		if( !sounds[i].available && sounds[i].snd == snd )
			break;
	if( i == ARRAYSIZE(sounds) )
	{
		LOG->Trace( "not stopping a sound because it's not playing" );
		return;
	}

	/* If we're already in STOPPED, there's nothing to do. */
	if( sounds[i].state == sound::STOPPED )
	{
		LOG->Trace( "not stopping a sound because it's already in STOPPED" );
		return;
	}

//	LOG->Trace("StopMixing: set %p (%s) to HALTING", sounds[i].snd, sounds[i].snd->GetLoadedFilePath().c_str());

	/* Tell the mixing thread to flush the buffer.  We don't have to worry about
	 * the decoding thread, since we've locked m_Mutex. */
	sounds[i].state = sound::HALTING;

	/* Invalidate the snd pointer to guarantee we don't make any further references to
	 * it.  Once this call returns, the sound may no longer exist. */
	sounds[i].snd = NULL;
//	LOG->Trace("end StopMixing");
}

void InputFilter::ButtonPressed( DeviceInput di, bool Down )
{
	LockMut(*queuemutex);

	if( di.ts.IsZero() )
		LOG->Warn( "InputFilter::ButtonPressed: zero timestamp is invalid" );

	if( di.device >= NUM_INPUT_DEVICES )
	{
		LOG->Warn( "Invalid device %i,%i", di.device, NUM_INPUT_DEVICES );
		return;
	}
	if( di.button >= GetNumDeviceButtons(di.device) )
	{
		LOG->Warn( "Invalid button %i,%i", di.button, GetNumDeviceButtons(di.device) );
		return;
	}

	ButtonState &bs = m_ButtonState[di.device][di.button];

	RageTimer now;
	CheckButtonChange( bs, di, now );

	if( bs.m_BeingHeld != Down )
	{
		bs.m_BeingHeld = Down;
		bs.m_BeingHeldTime = di.ts;
	}

	/* Try to report presses immediately. */
	CheckButtonChange( bs, di, now );
}

void RageThread::Create( int (*fn)(void *), void *data )
{
	/* Don't create a thread that's already running: */
	ASSERT( m_pSlot == NULL );

	InitThreads();

	/* Lock unused slots, so nothing else uses our slot before we mark it used. */
	LockMut(g_ThreadSlotsLock);

	int slotno = FindEmptyThreadSlot();
	m_pSlot = &g_ThreadSlots[slotno];
	
	if( name == "" )
	{
		if( LOG )
			LOG->Warn("Created a thread without naming it first.");

		/* If you don't name it, I will: */
		strcpy( m_pSlot->name, "Joe" );
	} else {
		strcpy( m_pSlot->name, name.c_str() );
	}

	if( LOG )
		LOG->Trace( "Starting thread: %s", name.c_str() );
	sprintf( m_pSlot->ThreadFormattedOutput, "Thread: %s", name.c_str() );

	/* Start a thread using our own startup function.  We pass the id to fill in,
	 * to make sure it's set before the thread actually starts.  (Otherwise, early
	 * checkpoints might not have a completely set-up thread slot.) */
	m_pSlot->pImpl = MakeThread( fn, data, &m_pSlot->id );
}

void InputHandler_MacOSX_HID::DeviceAdded( void *refCon, io_iterator_t )
{
	InputHandler_MacOSX_HID *This = (InputHandler_MacOSX_HID *)refCon;

	LockMut( This->m_ChangeLock );
	This->m_bChanged = true;
}

void RageSoundDriver_ALSA9::StopMixing(RageSoundBase *snd)
{
	/* Lock, to make sure the decoder thread isn't running on this sound while we do this. */
	LockMut( m_Mutex );

	ASSERT(snd != NULL);

	unsigned i;
	for( i = 0; i < stream_pool.size(); ++i )
		if(stream_pool[i]->snd == snd)
			break;

	if( i == stream_pool.size() )
	{
		LOG->Trace("not stopping a sound because it's not playing");
		return;
	}

	/* FLUSHING tells the mixer thread to release the stream once str->flush_bufs
	 * buffers have been flushed. */
	stream_pool[i]->state = stream_pool[i]->FLUSHING;

	/* Flush two buffers worth of data. */
	stream_pool[i]->flush_pos = stream_pool[i]->pcm->GetPlayPos();

	/* This function is called externally (by RageSoundBase) to stop immediately.
	 * We need to prevent SoundStopped from being called; it should only be
	 * called when we stop implicitely at the end of a sound.  Set snd to NULL. */
	stream_pool[i]->snd = NULL;
}

RageFileBasic *RageFileDriverMem::Open( const CString &sPath, int mode, int &err )
{
	LockMut(m_Mutex);

	if( mode == RageFile::WRITE )
	{
		/* If the file exists, delete it. */
		Remove( sPath );

		RageFileObjMemFile *pFile = new RageFileObjMemFile;

		/* Add one reference, representing the file in the filesystem. */
		RageFileObjMemFile::AddReference( pFile );

		m_Files.push_back( pFile );
		FDB->AddFile( sPath, 0, 0, pFile );

		return new RageFileObjMem( pFile );
	}

	RageFileObjMemFile *pFile = (RageFileObjMemFile *) FDB->GetFilePriv( sPath );
	if( pFile == NULL )
	{
		err = ENOENT;
		return NULL;
	}

	return new RageFileObjMem( pFile );
}

struct tm *my_localtime_r( const time_t *timep, struct tm *result )
{
	static RageMutex mut("my_localtime_r");
	LockMut(mut);

	*result = *localtime( timep );
	return result;
}

bool ArchHooks::AppFocusChanged()
{
	LockMut( g_Mutex );
	bool bFocusChanged = m_bFocusChanged;
	
	m_bFocusChanged = false;
	return bFocusChanged;
}

void RemoveReference( const RageFileObj *obj )
{
	LockMut( *g_Mutex );

	FileReferences::iterator it = g_Refs.find( obj );
	ASSERT_M( it != g_Refs.end(), ssprintf( "RemoveReference: Missing reference (%s)", obj->GetDisplayPath().c_str() ) );
	g_Refs.erase( it );
}

bool RageSound::SetPositionFrames( int iFrames )
{
	LockMut( m_Mutex );

	if( m_pSource == NULL )
	{
		LOG->Warn( "RageSound::SetPositionFrames(%d): sound not loaded", iFrames );
		return false;
	}

	{
		/* "m_iDecodePosition" records the number of frames we've output to the
		 * speaker.  If the rate isn't 1.0, this will be different from the
		 * position in the sound data itself.  For example, if we're playing
		 * at 0.5x, and we're seeking to the 10th frame, we would have actually
		 * played 20 frames, and it's the number of real speaker frames that
		 * "m_iDecodePosition" represents. */
	    const int iScaledFrames = int( iFrames / GetPlaybackRate() );

	    /* If we're already there, don't do anything. */
	    if( m_iDecodePosition == iScaledFrames )
		    return true;

	    m_iStoppedPosition = m_iDecodePosition = iScaledFrames;
	}

	/* The position we're going to seek the input stream to.  We have
	 * to do this in floating point to avoid overflow. */
	int ms = int( float(iFrames) * 1000.f / samplerate() );
	ms = max(ms, 0);

	m_DataBuffer.clear();

	int ret;
	if( m_Param.AccurateSync )
		ret = m_pSource->SetPosition_Accurate(ms);
	else
		ret = m_pSource->SetPosition_Fast(ms);

	if(ret == -1)
	{
		/* XXX untested */
		Fail( m_pSource->GetError() );
		return false; /* failed */
	}

	if(ret == 0 && ms != 0)
	{
		/* We were told to seek somewhere, and we got 0 instead, which means
		 * we passed EOF.  This could be a truncated file or invalid data. */
		LOG->Warn("SetPositionFrames: %i ms is beyond EOF in %s",
			ms, GetLoadedFilePath().c_str());

		return false; /* failed */
	}

	return true;
}