library/cpp/coroutine/engine/mutex.h


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#pragma once 

#include "impl.h" 
#include "events.h" 
 
class TContMutex {
public:
    TContMutex() noexcept 
        : Token_(true)
    {
    }

    ~TContMutex() { 
        Y_ASSERT(Token_);
    }

    int LockD(TCont* current, TInstant deadline) { 
        while (!Token_) {
            const int ret = WaitQueue_.WaitD(current, deadline);

            if (ret != EWAKEDUP) {
                return ret;
            }
        }

        Token_ = false;

        return 0;
    }

    int LockT(TCont* current, TDuration timeout) { 
        return LockD(current, timeout.ToDeadLine());
    }

    int LockI(TCont* current) { 
        return LockD(current, TInstant::Max());
    }

    void UnLock() noexcept { 
        Y_ASSERT(!Token_);

        Token_ = true;
        WaitQueue_.Signal();
    }

private:
    TContWaitQueue WaitQueue_;
    bool Token_;
};