#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
//互斥变量和条件变量静态初始化
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)
{// sleep(30);
    pthread_t t_a;pthread_t t_b;pthread_create(&t_a,NULL,thread1,(void *)NULL);/*创建进程t_a*/pthread_create(&t_b,NULL,thread2,(void *)NULL); /*创建进程t_b*/pthread_join(t_a, NULL);/*等待进程t_a结束*/pthread_join(t_b, NULL);/*等待进程t_b结束*/pthread_mutex_destroy(&mutex);pthread_cond_destroy(&cond);exit(0);
}/*
pthread_t pthread_self(void);
函数作用：获得线程自身的ID。
pthread_t的类型为unsigned long int，
所以在打印的时候要使用%lu方式，否则将产生奇怪的结果
*/
void *thread1(void *junk)
{for(i=1;i<=6;i++){pthread_mutex_lock(&mutex);/*锁住互斥量*/{printf("Thread1: lock ------%lu\n", pthread_self());}if(i%3==0){printf("Thread1:signal1------%lu\n", pthread_self());pthread_cond_signal(&cond);/*条件改变，发送信号，通知t_b进程*/printf("Thread1:signal2------%lu\n", pthread_self());sleep(1);}pthread_mutex_unlock(&mutex);/*解锁互斥量*/printf("Thread1: unlock ------%lu\n", pthread_self());sleep(1);}
}void *thread2(void *junk)
{while(i<6){pthread_mutex_lock(&mutex);printf("Thread2: lock ------%lu\n", pthread_self());if(i%3!=0){printf("Thread2: wait1------%lu\n", pthread_self());pthread_cond_wait(&cond,&mutex);/*解锁mutex，并等待cond改变*/printf("Thread2: wait2------%lu\n", pthread_self());}pthread_mutex_unlock(&mutex);printf("Thread2: unlock ------%lu\n", pthread_self());sleep(1);}
}/*
[ztteng@ztteng 7.7_8]$ ./pthreadcond
Thread2: lock ------3068291952
Thread2: wait1------3068291952
Thread1: lock ------3078781808
Thread1: unlock ------3078781808
Thread1: lock ------3078781808
Thread1: unlock ------3078781808
Thread1: lock ------3078781808
Thread1:signal1------3078781808
Thread1:signal2------3078781808
Thread1: unlock ------3078781808
Thread2: wait2------3068291952
Thread2: unlock ------3068291952
Thread1: lock ------3078781808
Thread1: unlock ------3078781808
Thread2: lock ------3068291952
Thread2: wait1------3068291952
Thread1: lock ------3078781808
Thread1: unlock ------3078781808
Thread1: lock ------3078781808
Thread1:signal1------3078781808
Thread1:signal2------3078781808
Thread1: unlock ------3078781808
Thread2: wait2------3068291952
Thread2: unlock ------3068291952
*/