mirror of https://github.com/ArduPilot/ardupilot
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
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/*
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* This file is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Code by Andrew Tridgell and Siddharth Bharat Purohit
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*/
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#include <AP_HAL/AP_HAL.h>
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#if CONFIG_HAL_BOARD == HAL_BOARD_CHIBIOS
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#include "Semaphores.h"
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extern const AP_HAL::HAL& hal;
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using namespace ChibiOS;
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bool Semaphore::give()
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{
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chMtxUnlock(&_lock);
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return true;
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}
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bool Semaphore::take(uint32_t timeout_ms)
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{
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if (timeout_ms == HAL_SEMAPHORE_BLOCK_FOREVER) {
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chMtxLock(&_lock);
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return true;
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}
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if (take_nonblocking()) {
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return true;
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}
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uint64_t start = AP_HAL::micros64();
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do {
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hal.scheduler->delay_microseconds(200);
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if (take_nonblocking()) {
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return true;
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}
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} while ((AP_HAL::micros64() - start) < timeout_ms*1000);
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return false;
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}
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bool Semaphore::take_nonblocking()
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{
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return chMtxTryLock(&_lock);
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}
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#endif // CONFIG_HAL_BOARD
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