sem_wait不能被sem_post唤醒

#include "so_test.h"
#include <stdio.h>  
#include <unistd.h>  
#include <stdlib.h>  
#include <string.h>  
#include <pthread.h>  
#include <semaphore.h> 


sem_t bin_sem;  
void *thread_function1(void *arg)  
{  
printf("thread_function1--------------sem_wait\n");

sem_wait(&bin_sem);
printf("sem_wait\n");
exit(1);

}

int main()  
{
	int res;  
	pthread_t a_thread;  
	void *thread_result;  

	res = sem_init(&bin_sem, 0, 0);  
	if (res != 0)  
	{  
	 perror("Semaphore initialization failed");  
	} 
	printf("sem_init\n");

	res = pthread_create(&a_thread, NULL, thread_function1, NULL);  
	if (res != 0)  
	{  
	 perror("Thread creation failure");  
	}

	printf("thread_function1\n");  


	int count = 0;
	while (1)  
	{
		count++;
		sem_post(&bin_sem);
		printf("%d\n", count);

	}

return 1;

}

sem_wait估计是按某种心跳来检查 ，

当发送大量sem_post或者cpu负荷高的时候

就会有明显的延迟触发现象,

随手测试下可以跳出去5千多才被触发