ksemaphore.h

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/*===========================================================================
     _____        _____        _____        _____
 ___|    _|__  __|_    |__  __|__   |__  __| __  |__  ______
|    \  /  | ||    \      ||     |     ||  |/ /     ||___   |
|     \/   | ||     \     ||     \     ||     \     ||___   |
|__/\__/|__|_||__|\__\  __||__|\__\  __||__|\__\  __||______|
    |_____|      |_____|      |_____|      |_____|

--[Mark3 Realtime Platform]--------------------------------------------------

Copyright (c) 2012 - 2019 m0slevin, all rights reserved.
See license.txt for more information
=========================================================================== */
#pragma once

#include "kerneltypes.h"
#include "mark3cfg.h"

#include "blocking.h"
#include "threadlist.h"

namespace Mark3
{
//---------------------------------------------------------------------------
class Semaphore : public BlockingObject
{
public:
    void* operator new(size_t sz, void* pv) { return reinterpret_cast<Semaphore*>(pv); };
    ~Semaphore();

    void Init(uint16_t u16InitVal_, uint16_t u16MaxVal_);

    bool Post();

    void Pend();

    uint16_t GetCount();

    bool Pend(uint32_t u32WaitTimeMS_);

    void WakeMe(Thread* pclChosenOne_);

private:
    uint8_t WakeNext();

    bool Pend_i(uint32_t u32WaitTimeMS_);

    uint16_t m_u16Value;    
    uint16_t m_u16MaxValue; 
};
} // namespace Mark3