同步线程

Question

如何使用 pthreads 让两个线程互相等待，直到它们各自完成一个循环？

void* th1Fn()
{  
    while(1)
    {
        //do something
        printf("I'm done");
        //signal that i'm done
        //wait for thread2 so that I can repeat the cycle
    }
}

void* th2Fn()
{       
    while(1)
    {
        //do something
        printf("I'm done");
        //signal that i'm done
        //wait for thread1 so that I can repeat the cycle
    }
}

Answer 1

您正在寻找pthread_barrier_wait：http://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_barrier_wait.html

这里是这个函数的文档示例：http://man7.org/tlpi/code/online/dist/threads/pthread_barrier_demo.c.html