OS X 上的 sem_init [英] sem_init on OS X

问题描述

我正在编写一些使用 pthread 和信号量库的代码.sem_init 函数在我的 Ubuntu 机器上运行良好，但在 OS X 上 sem_init 函数完全无效.图书馆有什么问题还是有不同的做法?这是我用来测试的代码.

I am working on some code which uses the pthread and semaphore libraries. The sem_init function works fine on my Ubuntu machine, but on OS X the sem_init function has absolutely no effect. Is there something wrong with the library or is there a different way of doing it? This is the code I am using to test.

sem_t sem1;
sem_t sem2;
sem_t sem3;
sem_t sem4;
sem_t sem5;
sem_t sem6;

sem_init(&sem1, 1, 1);
sem_init(&sem2, 1, 2);
sem_init(&sem3, 1, 3);
sem_init(&sem4, 1, 4);
sem_init(&sem5, 1, 5);
sem_init(&sem6, 1, 6);

这些值似乎是随机数，并且在调用 sem_init 后不会改变.

The values appear to be random numbers, and they do not change after the sem_init call.

推荐答案

不支持未命名信号量，需要使用命名信号量.

Unnamed semaphores are not supported, you need to use named semaphores.

要使用命名信号量代替未命名信号量，请使用sem_open 代替sem_init，并使用sem_close 和sem_unlink> 而不是 sem_destroy.

To use named semaphores instead of unnamed semaphores, use sem_open instead of sem_init, and use sem_close and sem_unlink instead of sem_destroy.

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