109 lines
3.2 KiB
C++
109 lines
3.2 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/platform/system_timer.h"
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#include "chre/platform/fatal_error.h"
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#include "chre/platform/log.h"
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#include "chre/util/time.h"
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namespace chre {
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void SystemTimerBase::rtTimerCallback(struct rt_timer *rtTimer) {
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if (rtTimer != nullptr) {
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SystemTimer *systemTimer = static_cast<SystemTimer *>(rtTimer->private_ptr);
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BaseType_t xHigherPriorityTaskWoken = pdFALSE;
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vTaskNotifyGiveFromISR(systemTimer->mCallbackRunnerHandle,
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&xHigherPriorityTaskWoken);
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portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
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}
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}
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void SystemTimerBase::callbackRunner(void *context) {
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SystemTimer *systemTimer = static_cast<SystemTimer *>(context);
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if (systemTimer == nullptr) {
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FATAL_ERROR("Null System Timer");
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}
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while (true) {
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ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
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SystemTimerCallback *callback = systemTimer->mCallback;
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if (callback != nullptr) {
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callback(systemTimer->mData);
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}
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}
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}
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SystemTimer::SystemTimer() {
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// Initialize the rtSystemTimer struct.
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// The timer's callback and the private data won't be changed through the
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// lifetime so init() should only be run once. The creation of the callback
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// runner thread is delayed to the call of init().
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rt_timer_init(&rtSystemTimer, /* func= */ rtTimerCallback, /* data= */ this);
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}
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SystemTimer::~SystemTimer() {
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// cancel an existing timer if any
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cancel();
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// Delete the callback runner thread if it was created
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if (mCallbackRunnerHandle != nullptr) {
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vTaskDelete(mCallbackRunnerHandle);
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mCallbackRunnerHandle = nullptr;
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}
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}
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bool SystemTimer::init() {
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if (mInitialized) {
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return true;
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}
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BaseType_t xReturned = xTaskCreate(
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callbackRunner, kTaskName, kStackDepthWords,
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/* pvParameters= */ this, kTaskPriority, &mCallbackRunnerHandle);
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if (xReturned == pdPASS) {
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mInitialized = true;
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return true;
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}
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LOGE("Failed to create the callback runner thread");
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return false;
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}
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bool SystemTimer::set(SystemTimerCallback *callback, void *data,
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Nanoseconds delay) {
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if (!mInitialized) {
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LOGW("Timer is not initialized");
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return false;
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}
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cancel();
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mCallback = callback;
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mData = data;
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rt_timer_start(&rtSystemTimer, delay.toRawNanoseconds(),
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/* oneShot= */ true);
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return true;
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}
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bool SystemTimer::cancel() {
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// TODO(b/254708051): This usage of critical section is pending confirmation.
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taskENTER_CRITICAL();
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if (isActive()) {
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rt_timer_stop(&rtSystemTimer);
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}
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taskEXIT_CRITICAL();
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return true;
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}
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bool SystemTimer::isActive() {
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return rt_timer_active(&rtSystemTimer);
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}
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} // namespace chre
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