sema_inv.h

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/*
 * Copyright (C) 2021 ML!PA 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.
 */
 
#pragma once

 
#include "atomic_utils.h"
#include "mutex.h"
 
#ifdef MODULE_XTIMER
#include "xtimer.h"
#endif
 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    uint32_t value; 
    mutex_t lock;   
} sema_inv_t;

bool sema_inv_post(sema_inv_t *s);

bool sema_inv_post_mask(sema_inv_t *s, uint32_t mask);

static inline void sema_inv_init(sema_inv_t *s, uint32_t value)
{
    const mutex_t locked = MUTEX_INIT_LOCKED;
    s->lock = locked;
    s->value = value;
}

static inline void sema_inv_wait(sema_inv_t *s)
{
    mutex_lock(&s->lock);
}

static inline int sema_inv_try_wait(sema_inv_t *s)
{
    return mutex_trylock(&s->lock);
}
 
#if defined(MODULE_XTIMER) || DOXYGEN
static inline int sema_inv_wait_timeout(sema_inv_t *s, uint32_t us)
{
    return xtimer_mutex_lock_timeout(&s->lock, us);
}
#endif
 
#ifdef __cplusplus
}
#endif