#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;/*初始化互斥锁*/
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;/*初始化条件变量*/
void *thread1(void *);
void *thread2(void *);
int i=1;
int main(void)
{
pthread_t t_a;
pthread_t t_b;
pthread_create(&t_a,NULL,thread2,(void *)NULL);/*创建进程t_a*/
pthread_create(&t_b,NULL,thread1,(void *)NULL); /*创建进程t_b*/
pthread_join(t_b, NULL);/*等待进程t_b结束*/
pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&cond);
exit(0);
}
void *thread1(void *junk)
{
for(i=1;i<=9;i++)
{
pthread_mutex_lock(&mutex);/*锁住互斥量*/
if(i%3==0)
pthread_cond_signal(&cond);/*条件改变,发送信号,通知t_b进程*/
else
printf("thead1:%d\n",i);
pthread_mutex_unlock(&mutex);/*解锁互斥量*/
sleep(1);
}
}
void *thread2(void *junk)
{
while(i<9)
{
pthread_mutex_lock(&mutex);
if(i%3!=0)
pthread_cond_wait(&cond,&mutex);/*等待, pthread_mutex_lock*/
printf("thread2:%d\n",i);
pthread_mutex_unlock(&mutex);
sleep(1);
}
}
pthread_cond_wait:
get cond àwake up;lock;
unget cond->unlock, then sleep