rmutex.h

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/*
 * Copyright (C) 2016 Theobroma Systems Design & Consulting GmbH
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#ifndef RMUTEX_H
#define RMUTEX_H
 
#include <stdint.h>
#ifdef __cplusplus
#include "c11_atomics_compat.hpp"
#else
#include <stdatomic.h>
#endif
 
#include "mutex.h"
#include "sched.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct rmutex_t {
    /* fields are managed by mutex functions, don't touch */
    mutex_t mutex;
 
    uint16_t refcount;
 
    atomic_int_least16_t owner;
} rmutex_t;
 
#define RMUTEX_INIT { MUTEX_INIT, 0, ATOMIC_VAR_INIT(KERNEL_PID_UNDEF) }
 
static inline void rmutex_init(rmutex_t *rmutex)
{
    rmutex_t empty_rmutex = RMUTEX_INIT;
 
    *rmutex = empty_rmutex;
}
 
int rmutex_trylock(rmutex_t *rmutex);
 
void rmutex_lock(rmutex_t *rmutex);
 
void rmutex_unlock(rmutex_t *rmutex);
 
#ifdef __cplusplus
}
#endif
 
#endif /* RMUTEX_H */