critical_section.h

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/*
 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
 
#ifndef _PICO_CRITICAL_SECTION_H
#define _PICO_CRITICAL_SECTION_H
 
#include "pico.h"
#include "pico/lock_core.h"
 
#ifdef __cplusplus
extern "C" {
#endif


typedef struct __packed_aligned critical_section {
    spin_lock_t *spin_lock; 
    uint32_t save;          
} critical_section_t;

void critical_section_init(critical_section_t *crit_sec);

void critical_section_init_with_lock_num(critical_section_t *crit_sec, uint lock_num);

__force_inline static void critical_section_enter_blocking(critical_section_t *crit_sec) {
    crit_sec->save = spin_lock_blocking(crit_sec->spin_lock);
}

__force_inline static void critical_section_exit(critical_section_t *crit_sec) {
    spin_unlock(crit_sec->spin_lock, crit_sec->save);
}

void critical_section_deinit(critical_section_t *crit_sec);

static inline bool critical_section_is_initialized(critical_section_t *crit_sec) {
    return crit_sec->spin_lock != 0;
}
 
#ifdef __cplusplus
}
#endif
#endif