YiCountDownLatch.h

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// © You i Labs Inc. 2000-2017. All rights reserved.
#ifndef _YI_COUNT_DOWN_LATCH_H_
#define _YI_COUNT_DOWN_LATCH_H_

#include "signal/YiSignal.h"

class CYIMutex;
class CYIWaitCondition;

// this object cannot be destroyed in a thread-safe manner if there are objects waiting on it.

class CYICountDownLatch
{
public:
    CYICountDownLatch(uint32_t uCount);
    ~CYICountDownLatch();

    void CountDown();
    
    void Wait() const;
    
    bool Wait(uint64_t uTimeoutMs) const;

    bool IsFinished() const;
    
    uint32_t GetCount() const;

    CYISignal<> Finished; 
    
private:
    mutable CYIMutex            m_mutex;
    mutable CYIWaitCondition    m_finishedCondition;
    uint32_t m_uCount;
};

#endif // _YI_COUNT_DOWN_LATCH_H_