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// SPDX-License-Identifier: MPL-2.0

/*

* mutex.h -- mutual exclusion lock

* Copyright (C) 2024 Jacob Koziej <[email protected]>

*/

#ifndef SIF_MUTEX_H

#define SIF_MUTEX_H

#include <sif/atomic.h>

#include <sif/config.h>

#include <sif/list.h>

#include <sif/task.h>

typedef enum sif_mutex_error {

SIF_MUTEX_ERROR_NONE,

SIF_MUTEX_ERROR_LOCKED,

SIF_MUTEX_ERROR_OWNER,

SIF_MUTEX_ERROR_UNDEFINED,

} sif_mutex_error_t;

typedef struct sif_mutex {

sif_atomic_t lock;

sif_task_t *owner;

sif_list_t *waiting[SIF_CONFIG_PRIORITY_LEVELS];

} sif_mutex_t;

void sif_mutex_init(sif_mutex_t *const mutex);

sif_mutex_error_t sif_mutex_lock(sif_mutex_t * const mutex);

sif_mutex_error_t sif_mutex_trylock(sif_mutex_t * const mutex);

sif_mutex_error_t sif_mutex_unlock(sif_mutex_t * const mutex);

#endif // SIF_MUTEX_H