什么是多线程等待`pthread_mutex_lock（）的'唤醒命令？ [英] What is the `pthread_mutex_lock()` wake order with multiple threads waiting?

问题描述

假如我有多个线程阻塞调用 pthread_mutex_lock（）的。如果互斥锁变为可用，这是否叫（）第一个线程调用pthread_mutex_lock获得锁？也就是说，是 FIFO顺序pthread_mutex_lock（）的电话？如果不是，那么，如果有的话，以便它们在？谢谢！

解决方案

  

在互斥变为可用，这是否叫第一个线程调用pthread_mutex_lock（）获得锁？

没有。一个等待的线程获得锁，但其中一个得到它并不确定。

  

FIFO的顺序？

FIFO互斥，而已经是一个模式。请参见在实施的pthreads一个FIFO互斥

Suppose I have multiple threads blocking on a call to pthread_mutex_lock(). When the mutex becomes available, does the first thread that called pthread_mutex_lock() get the lock? That is, are calls to pthread_mutex_lock() in FIFO order? If not, what, if any, order are they in? Thanks!

解决方案

When the mutex becomes available, does the first thread that called pthread_mutex_lock() get the lock?

No. One of the waiting threads gets a lock, but which one gets it is not determined.

FIFO order?

FIFO mutex is rather a pattern already. See Implementing a FIFO mutex in pthreads

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