esp-idf/components/ulp/ulp_riscv/ulp_riscv_lock.c

/*
 * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include "ulp_riscv_lock.h"
#include "ulp_riscv_lock_shared.h"

#include <assert.h>

void ulp_riscv_lock_acquire(ulp_riscv_lock_t *lock)
{
    assert(lock);

    lock->critical_section_flag_main_cpu = true;
    lock->turn = ULP_RISCV_LOCK_TURN_ULP;

    while (lock->critical_section_flag_ulp && (lock->turn == ULP_RISCV_LOCK_TURN_ULP)) {
    }
}

void ulp_riscv_lock_release(ulp_riscv_lock_t *lock)
{
    assert(lock);

    lock->critical_section_flag_main_cpu = false;
}