main2.c

POSIX下线程死锁的演示程序（操作系统实验）

/* 
/* 
 * POSIX下线程死锁的演示程序 1.2 
 * 作者：Sunner Sun
 * 最后修改时间：2005-3-16 17:56
 */

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <ctype.h>
#include <pthread.h>

#define LOOP_TIMES	10000
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t mutex2 = PTHREAD_MUTEX_INITIALIZER;
void* thread_worker(void*);
void critical_section(int thread_num, int i);

int main(void)
{
	int rtn, i;
	pthread_t pthread_id = 0;	/* 存放子线程的id */
	
	rtn = pthread_create(&pthread_id, NULL, thread_worker, NULL );

	if(rtn != 0)
	{
		printf("pthread_create ERROR!\n");
		return -1;
	}
	
	for (i=0; i<LOOP_TIMES; i++)
	{
		pthread_mutex_lock(&mutex1);
		pthread_mutex_lock(&mutex2);
		critical_section(1, i);
		pthread_mutex_unlock(&mutex2);
		pthread_mutex_unlock(&mutex1);
	}
	
	pthread_mutex_destroy(&mutex1);
	pthread_mutex_destroy(&mutex2);
	
	return 0;
}

void* thread_worker(void* p)
{
	int i;
	for (i=0; i<LOOP_TIMES; i++)
	{
		pthread_mutex_lock(&mutex1);
		pthread_mutex_lock(&mutex2);
		critical_section(2, i);
		pthread_mutex_unlock(&mutex2);
		pthread_mutex_unlock(&mutex1);
	}
}

void critical_section(int thread_num, int i)
{
	printf("Thread%d:%d\n", thread_num, i);
}