From: http://blog.csdn.net/leo115/article/details/8037869
- #include <stdio.h>
- #include <pthread.h>
- #include <sched.h>
- #include <unistd.h>
- //对临界区的保护问题
- void *fun1(void *arg);
- void *fun2(void *arg);
- int buffer = 0;
- pthread_mutex_t mutex;
- int running = 1;
- int main(void )
- {
- pthread_t pt1;
- pthread_t pt2;
- pthread_mutex_init(&mutex,NULL);
- pthread_create(&pt1,NULL,fun1,(void*)&running);
- pthread_create(&pt2,NULL,fun2,(void*)&running);
- usleep(1000);
- running=0;
- pthread_join(pt1,NULL);
- pthread_join(pt2,NULL);
- pthread_mutex_destroy(&mutex);
- return 0;
- }
- void *fun1(void *arg)
- {
- while(*(int *)arg)
- {
- //pthread_mutex_lock(&mutex);
- pthread_mutex_lock(&mutex);
- printf("in fun1 before add , buffer is : %d\n",buffer);
- usleep(2);
- buffer++;
- printf("in fun1 after sleep and add one ,now buffer is %d \n",buffer);
- //pthread_mutex_unlock(&mutex);
- pthread_mutex_unlock(&mutex);
- usleep(2);
- }
- }
- void *fun2(void *arg)
- {
- while(*(int *)arg)
- {
- //pthread_mutex_lock(&mutex);
- pthread_mutex_lock(&mutex);
- printf("in fun2 before add , buffer is : %d\n",buffer);
- usleep(2);
- buffer++;
- printf("in fun2 after sleep and add one ,now buffer is %d \n",buffer);
- //pthread_mutex_unlock(&mutex);
- pthread_mutex_unlock(&mutex);
- usleep(2);
- }
- }
注释互斥锁前的运行结果：
注释互斥锁后的运行结果：
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