82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "chre/target_platform/condition_variable_base.h"
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#include "chre/platform/condition_variable.h"
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#include "intc.h"
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namespace chre {
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void ConditionVariableBase::conditionVariablTimerCallback(
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struct rt_timer *rtTimer) {
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if (rtTimer != nullptr) {
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ConditionVariable *cv =
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static_cast<ConditionVariable *>(rtTimer->private_ptr);
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cv->isTimedOut = true;
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cv->notify_one();
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}
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}
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ConditionVariable::ConditionVariable() {
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// TODO(b/256870101): Use xSemaphoreCreateBinaryStatic when possible
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semaphoreHandle = xSemaphoreCreateBinary();
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if (semaphoreHandle == nullptr) {
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FATAL_ERROR("Failed to create cv semaphore");
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}
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}
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ConditionVariable::~ConditionVariable() {
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if (semaphoreHandle != NULL) {
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vSemaphoreDelete(semaphoreHandle);
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}
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}
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void ConditionVariable::notify_one() {
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if (is_in_isr()) {
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BaseType_t xHigherPriorityTaskWoken = pdFALSE;
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xSemaphoreGiveFromISR(semaphoreHandle, &xHigherPriorityTaskWoken);
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portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
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} else {
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xSemaphoreGive(semaphoreHandle);
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}
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}
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void ConditionVariable::wait(Mutex &mutex) {
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mutex.unlock();
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BaseType_t rc = xSemaphoreTake(semaphoreHandle, portMAX_DELAY);
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mutex.lock();
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if (rc == pdFALSE) {
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LOGE("Semaphore of the condition variable is unavailable.");
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}
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}
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bool ConditionVariable::wait_for(Mutex &mutex, Nanoseconds timeout) {
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rt_timer_init(&rtSystemTimer,
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/* func= */ nullptr,
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/* data= */ this);
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rt_timer_start(&rtSystemTimer, timeout.toRawNanoseconds(),
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/* oneShot= */ true);
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wait(mutex);
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taskENTER_CRITICAL();
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if (!isTimedOut) {
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rt_timer_stop(&rtSystemTimer);
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}
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taskEXIT_CRITICAL();
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return isTimedOut;
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}
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} // namespace chre
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