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_; 
};