recursive_mutex.h

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// Copyright (c) 2014, 임경현 (dlarudgus20)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
//   list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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/*
 * @file recursive_mutex.h
 * @date 2014. 5. 11.
 * @author dlarudgus20
 * @copyright The BSD (2-Clause) License
 */

#ifndef MUTEX_H_
#define MUTEX_H_

#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include "task.h"

typedef struct tagRecursiveMutex
{
    volatile uint32_t TaskId;
    volatile uint32_t LockCount;

    // 32비트 단위로 메모리를 mov하는 건 원자성이 있음.
    volatile uint32_t bLocked;
} RecursiveMutex;

static inline void ckRecursiveMutexInit(RecursiveMutex *pMutex)
{
    pMutex->TaskId = TASK_INVALID_ID;
    pMutex->LockCount = 0;
    pMutex->bLocked = false;
}

uint32_t ckRecursiveMutexLock(RecursiveMutex *pMutex);
bool ckRecursiveMutexUnlock(RecursiveMutex *pMutex);

#endif /* MUTEX_H_ */