ex10_3.c

来自「linux 高级编程的例子源码,包括了本书上的所有代码」· C语言 代码 · 共 43 行

/*filename :ex7_3.c*/
#include <pthread.h>

#define THREAD_NUM 3
pthread_mutex_t mutex=PTHREAD_MUTEX_INITILIZER;
int count=0;
void *my_thread(void *arg)
{
	int mycount;
    int i;

	count++;
	mycount=count;
	for (i=0;i<3;i++)
	{
	   pthread_lock(&mutex);
	   printf("Thread %d:get into critical section\n",mycount);
	   sleep(1);
       printf("Thread %d:left critical section\n",mycount);
	   pthread_unlock(&mutex);

       sleep(5*(float)random()/(float)RAND_MAX);
	}
	pthread_exit(&mycount);

}

int main()
{
	int i;
	pthread_t thread[THREAD_NUM];

	for (i=0;i<THREAD_NUM;i++)
	{
		pthread_create(&thread[i],NULL,my_thread,NULL);
	}
	for (i=0;i<THREAD_NUM;i++)
	{
		pthread_join(thread[i],NULL);
	}
	pthread_mutex_destroy(&mutex);
	exit(0);
}