66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*
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CoreMutex for the Raspberry Pi Pico RP2040
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Implements a deadlock-safe multicore mutex for sharing things like the
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USB or UARTs.
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Copyright (c) 2021 Earle F. Philhower, III <earlephilhower@yahoo.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "Arduino.h"
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#include "CoreMutex.h"
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CoreMutex::CoreMutex(mutex_t *mutex, uint8_t option) {
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_mutex = mutex;
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_acquired = false;
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_option = option;
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if (__isFreeRTOS) {
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auto m = __get_freertos_mutex_for_ptr(mutex);
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if (_option & FromISR) {
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__freertos_mutex_take_from_isr(m);
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} else {
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__freertos_mutex_take(m);
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}
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} else {
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uint32_t owner;
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if (!mutex_try_enter(_mutex, &owner)) {
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if (owner == get_core_num()) { // Deadlock!
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if (_option & DebugEnable) {
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DEBUGCORE("CoreMutex - Deadlock detected!\n");
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}
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return;
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}
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mutex_enter_blocking(_mutex);
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}
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}
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_acquired = true;
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}
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CoreMutex::~CoreMutex() {
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if (_acquired) {
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if (__isFreeRTOS) {
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auto m = __get_freertos_mutex_for_ptr(_mutex);
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if (_option & FromISR) {
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__freertos_mutex_give_from_isr(m);
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} else {
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__freertos_mutex_give(m);
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}
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} else {
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mutex_exit(_mutex);
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}
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}
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}
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