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94 lines
2.1 KiB
94 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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}
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