library/cpp/threading/equeue/equeue.h


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#pragma once 
 
#include <util/thread/pool.h>
#include <util/system/atomic.h> 
#include <util/generic/ptr.h> 
 
//actual queue limit will be (maxQueueSize - numBusyThreads) or 0 
class TElasticQueue: public IThreadPool {
public: 
    explicit TElasticQueue(THolder<IThreadPool> slaveQueue); 
 
    bool Add(IObjectInQueue* obj) override; 
    size_t Size() const noexcept override; 
 
    void Start(size_t threadCount, size_t maxQueueSize) override; 
    void Stop() noexcept override; 
 
    size_t ObjectCount() const; 
private: 
    class TDecrementingWrapper; 
 
    bool TryIncCounter(); 
private: 
    THolder<IThreadPool> SlaveQueue_;
    size_t MaxQueueSize_ = 0; 
    TAtomic ObjectCount_ = 0; 
    TAtomic GuardCount_ = 0; 
};