dyld-421.1.tar.gz

[apple/dyld.git] / src / dyldLock.cpp

/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
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 * Version 2.0 (the 'License'). You may not use this file except in
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#include <pthread.h>

#include "dyldLock.h"



static pthread_mutex_t	sGlobalMutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER;

// <rdar://problem/6361143> Need a way to determine if a gdb call to dlopen() would block
int	__attribute__((visibility("hidden")))			_dyld_global_lock_held = 0;


LockHelper::LockHelper() 
{ 
	dyldGlobalLockAcquire();
}

LockHelper::~LockHelper() 
{ 
	dyldGlobalLockRelease();
}

void dyldGlobalLockAcquire() 
{
	pthread_mutex_lock(&sGlobalMutex);
	++_dyld_global_lock_held;
}

void dyldGlobalLockRelease() 
{
	--_dyld_global_lock_held;
	pthread_mutex_unlock(&sGlobalMutex);
}