android c++线程互斥类Condition

最新推荐文章于 2024-11-11 22:25:34 发布

原创最新推荐文章于 2024-11-11 22:25:34 发布 · 1.3k 阅读

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#android #c++ #signal #pthreads #variables #thread

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本文介绍了一个系统依赖实现的条件变量类，该类与互斥锁配合使用，支持等待、信号和广播操作。文章详细解释了如何通过锁定互斥锁并调用等待方法使线程进入等待状态，以及如何发送信号或广播唤醒等待的线程。

/*
* Condition variable class. The implementation is system-dependent.
*
* Condition variables are paired up with mutexes. Lock the mutex,
* call wait(), then either re-wait() if things aren't quite what you want,
* or unlock the mutex and continue. All threads calling wait() must
* use the same mutex for a given Condition.
*/
class Condition {
public:
   enum {
   PRIVATE = 0,
   SHARED = 1
   };

   Condition();
   Condition(int type);
   ~Condition();
   // Wait on the condition variable. Lock the mutex before calling.
   status_t wait(Mutex& mutex);
   // same with relative timeout
   status_t waitRelative(Mutex& mutex, nsecs_t reltime);
   // Signal the condition variable, allowing one thread to continue.
   void signal();
   // Signal the condition variable, allowing all threads to continue.
   void broadcast();

private:
#if defined(HAVE_PTHREADS)
   pthread_cond_t mCond;
#else
   void* mState;
#endif
};