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

/*
     File: CABundleLocker.cpp
 Abstract: CABundleLocker.h
  Version: 1.1

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 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
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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

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*/
#include "CABundleLocker.h"
#include <pthread.h>

/*
some bundle operations are not thread safe, notably CFCopyLocalizedStringFromTableInBundle
*/

static pthread_mutex_t sCABundleLocker = PTHREAD_MUTEX_INITIALIZER;

#define RECURSIVE_LOCK 0

#if RECURSIVE_LOCK
static pthread_once_t sOnce = PTHREAD_ONCE_INIT;

static void InitCABundleLocker()
{
	// have to do this because OS X lacks PTHREAD_MUTEX_RECURSIVE_INITIALIZER_NP
	pthread_mutexattr_t attr;
	pthread_mutexattr_init(&attr);
	pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
	pthread_mutex_init(&sCABundleLocker, &attr);
	pthread_mutexattr_destroy(&attr);
}
#endif

CABundleLocker::CABundleLocker()
{
#if RECURSIVE_LOCK
	pthread_once(&sOnce, InitCABundleLocker);
#endif
	pthread_mutex_lock(&sCABundleLocker);
}

CABundleLocker::~CABundleLocker()
{
	pthread_mutex_unlock(&sCABundleLocker);
}