Posix semaphore blocked by Mac Store sandbox

sem_open无法在Mac Store App中使用，会被sandbox denied，需要额外的权限，为保险起见，还是不要使用，免得被Apple拒了

以下代码无法通过

#include <semaphore.h>

sem_t * pSemaphore = sem_open(name, O_CREAT, 0777, 1);
if (pSemaphore == (sem_t *)SEM_FAILED)
{
    //... 
}

用pthread_mutex替代

#include <pthread.h>

pthread_mutex_t* pSemaphore = (pthread_mutex_t *)BL_MALLOC(sizeof(pthread_mutex_t));
int ret = pthread_mutex_init(pSemaphore, NULL);
if (ret != 0)
{
    //... 
}

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