使用pthreads进行进程间互斥

sem_t sem;

/* initialize using sem_init or sem_open */

sem_wait(&sem);
/* critical region */
sem_post(&sem);

在最初发布此答案多年后,必须对其进行更新.

实际应该使用互斥锁而不是信号量. R和kuga的评论(下面逐字复制)解释了原因.特别是我发现kuga提到互斥锁只能通过锁定线程发布最引人注目的.

[R

sem_init requires a nonzero pshared argument to be shared,just like a
mutex would require the pshared attribute. There’s no reason to prefer
semaphores over mutexes for this,and in fact mutexes would be better
because you could use a robust mutex which allows you to handle the
(very real!) case where one process dies while holding the lock.

玖珂

Additionally to R..`s post,a mutex can only be posted by the thread that locks it. This is often required and a semaphore does not provide this feature. So this is not the correct answer,Jeff′s answer should be flagged as the correct answer.