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95 lines
2.1 KiB
95 lines
2.1 KiB
/*
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* Copyright (C) 2015-2016 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 "Worker.h"
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#include <sys/prctl.h>
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#include <sys/resource.h>
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namespace android {
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Worker::Worker(const char *name, int priority)
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: name_(name), priority_(priority), exit_(false), initialized_(false) {
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}
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Worker::~Worker() {
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Exit();
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}
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int Worker::InitWorker() {
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std::lock_guard<std::mutex> lk(mutex_);
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if (initialized())
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return -EALREADY;
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thread_ = std::unique_ptr<std::thread>(
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new std::thread(&Worker::InternalRoutine, this));
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initialized_ = true;
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exit_ = false;
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return 0;
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}
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void Worker::Exit() {
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std::unique_lock<std::mutex> lk(mutex_);
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exit_ = true;
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if (initialized()) {
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lk.unlock();
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cond_.notify_all();
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thread_->join();
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initialized_ = false;
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}
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}
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int Worker::WaitForSignalOrExitLocked(int64_t max_nanoseconds) {
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int ret = 0;
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if (should_exit())
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return -EINTR;
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std::unique_lock<std::mutex> lk(mutex_, std::adopt_lock);
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if (max_nanoseconds < 0) {
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cond_.wait(lk);
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} else if (std::cv_status::timeout ==
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cond_.wait_for(lk, std::chrono::nanoseconds(max_nanoseconds))) {
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ret = -ETIMEDOUT;
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}
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// exit takes precedence on timeout
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if (should_exit())
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ret = -EINTR;
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// release leaves mutex locked when going out of scope
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lk.release();
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return ret;
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}
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void Worker::InternalRoutine() {
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setpriority(PRIO_PROCESS, 0, priority_);
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prctl(PR_SET_NAME, name_.c_str());
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std::unique_lock<std::mutex> lk(mutex_, std::defer_lock);
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while (true) {
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lk.lock();
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if (should_exit())
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return;
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lk.unlock();
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Routine();
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}
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}
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} // namespace android
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