| /* |
| * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include "pico/critical_section.h" |
| |
| #if PICO_32BIT |
| static_assert(sizeof(critical_section_t) == 8, ""); |
| #endif |
| |
| void critical_section_init(critical_section_t *crit_sec) { |
| critical_section_init_with_lock_num(crit_sec, (uint)spin_lock_claim_unused(true)); |
| } |
| |
| void critical_section_init_with_lock_num(critical_section_t *crit_sec, uint lock_num) { |
| crit_sec->spin_lock = spin_lock_instance(lock_num); |
| __mem_fence_release(); |
| } |
| |
| void critical_section_deinit(critical_section_t *crit_sec) { |
| spin_lock_unclaim(spin_lock_get_num(crit_sec->spin_lock)); |
| crit_sec->spin_lock = NULL; |
| } |