Question

只是想看看这是否是正确的做事方式：

Thread A {
    pthread_lock_mutex(&mutex);
    while(flag_set())
        pthread_cond_wait(&cond, &mutex);
    read_file();
    pthread_unlock_mutex(&mutex);
}

Thread B{
    pthread_cond_signal( &cond );
}

抱歉，我对线程很陌生。

Answer 1

您可以通过使用其他构造实现目标 - 例如ManualResetEvent或AutoResetEvent。以下是两个C＃示例：

var resetEvent = new ManualResetEvent(false);

new Timer(o => resetEvent.Set(), null, 1, 500); // Set() is called in another thread
                                                // it unblocks main thread

resetEvent.Reset(); // main thread will be blocked in WaitOne() method

while (true)
{
    resetEvent.WaitOne(); // this waits until event is set
    resetEvent.Reset(); // immediatelly reset it back
    // do something

}

.....

var resetEvent = new AutoResetEvent(false);

new Timer(o => resetEvent.Set(), null, 1, 500); // this is called in another thread

resetEvent.Reset();

while (true)
{
    resetEvent.WaitOne();
    // do something

}

Answer 2

使用Monitor.WAit和Monitor.Pulse

    static readonly object _locker = new object();

    static void Main()
    {
      new thread (work1).start();

       new thread (work2).start();

     }

     Static void work1()
     {
         console.writeline("work1 started");
         lock(_locker)
           Monitor.Wait(_locker);   //here we block the first thread until its signaled from the second thread

        console.writeline("work1 wake up");
     }

     static void work2()
     {
           console.writeline("work2 will a wake work1");
           console.readline();
           lock(_locker)
            {
                Monitor.pulse(_locker);    //tell the first thread to continue working
            }
      }

线程Cond。这是正确的C ++方式吗？

2 个答案: