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/*

有兩個共享變量x和y，通過互斥量mut保護，當x>y時，條件變量cond被觸發

*/

#include <stdio.h>

#include <pthread.h>

int x = 0,y = 10;

pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;

pthread_cond_t cond = PTHREAD_COND_INITIALIZER;

void *fun1(void* arg)

{

pthread_mutex_lock(&mut);

//此線程因等待條件滿足而阻塞

while(x <= y)

pthread_cond_wait(&cond,&mut);

//對x，y進行操作

printf("x = %d\n",x);

printf("y = %d\n",y);

pthread_mutex_unlock(&mut);

}

void *fun2(void* arg)

{

int i;

for(i = 0; i < 20; i++)

{

pthread_mutex_lock(&mut);

//修改x，y

x = i;

printf("i = %d\n",i);

//條件滿足時，喚醒阻塞的線程

if(x > y)

// pthread_cond_broadcast(&cond);

pthread_cond_signal(&cond);

pthread_mutex_unlock(&mut);

sleep(1);

}

}

int main(void)

{

pthread_t tid1,tid2;

pthread_create(&tid1,NULL,fun1,NULL);

pthread_create(&tid2,NULL,fun2,NULL);

pthread_join(tid1,NULL);

pthread_join(tid1,NULL);

return 0;

}