110 lines
2.3 KiB
C++
110 lines
2.3 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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 <folly/executors/ManualExecutor.h>
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#include <cstring>
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#include <string>
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#include <tuple>
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namespace folly {
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ManualExecutor::~ManualExecutor() {
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while (keepAliveCount_.load(std::memory_order_relaxed)) {
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drive();
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}
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drain();
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}
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void ManualExecutor::add(Func callback) {
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std::lock_guard<std::mutex> lock(lock_);
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funcs_.emplace(std::move(callback));
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sem_.post();
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}
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size_t ManualExecutor::run() {
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size_t count;
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size_t n;
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Func func;
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{
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std::lock_guard<std::mutex> lock(lock_);
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while (!scheduledFuncs_.empty()) {
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auto& sf = scheduledFuncs_.top();
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if (sf.time > now_) {
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break;
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}
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funcs_.emplace(sf.moveOutFunc());
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scheduledFuncs_.pop();
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}
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n = funcs_.size();
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}
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for (count = 0; count < n; count++) {
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{
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std::lock_guard<std::mutex> lock(lock_);
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if (funcs_.empty()) {
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break;
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}
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// Balance the semaphore so it doesn't grow without bound
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// if nobody is calling wait().
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// This may fail (with EAGAIN), that's fine.
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sem_.tryWait();
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func = std::move(funcs_.front());
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funcs_.pop();
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}
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func();
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func = nullptr;
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}
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return count;
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}
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size_t ManualExecutor::drain() {
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size_t tasksRun = 0;
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size_t tasksForSingleRun = 0;
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while ((tasksForSingleRun = run()) != 0) {
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tasksRun += tasksForSingleRun;
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}
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return tasksRun;
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}
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void ManualExecutor::wait() {
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while (true) {
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{
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std::lock_guard<std::mutex> lock(lock_);
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if (!funcs_.empty()) {
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break;
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}
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}
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sem_.wait();
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}
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}
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void ManualExecutor::advanceTo(TimePoint const& t) {
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if (t > now_) {
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now_ = t;
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}
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run();
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}
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} // namespace folly
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