2dfaa1ab4c
This issue addresses possible starvation issues when using `getchar()` with `stdio_usb` and also fixes possible missing of IRQs as a result of #871
25 lines
700 B
C
25 lines
700 B
C
/*
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include "pico/critical_section.h"
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#if !PICO_NO_HARDWARE
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static_assert(sizeof(critical_section_t) == 8, "");
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#endif
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void critical_section_init(critical_section_t *crit_sec) {
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critical_section_init_with_lock_num(crit_sec, (uint)spin_lock_claim_unused(true));
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}
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void critical_section_init_with_lock_num(critical_section_t *crit_sec, uint lock_num) {
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crit_sec->spin_lock = spin_lock_instance(lock_num);
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__mem_fence_release();
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}
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void critical_section_deinit(critical_section_t *crit_sec) {
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spin_lock_unclaim(spin_lock_get_num(crit_sec->spin_lock));
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crit_sec->spin_lock = NULL;
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} |