123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105 |
- /*
- * Copyright 2014-present Facebook, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include <folly/executors/ManualExecutor.h>
- #include <string.h>
- #include <string>
- #include <tuple>
- namespace folly {
- ManualExecutor::~ManualExecutor() {
- drain();
- }
- void ManualExecutor::add(Func callback) {
- std::lock_guard<std::mutex> lock(lock_);
- funcs_.emplace(std::move(callback));
- sem_.post();
- }
- size_t ManualExecutor::run() {
- size_t count;
- size_t n;
- Func func;
- {
- std::lock_guard<std::mutex> lock(lock_);
- while (!scheduledFuncs_.empty()) {
- auto& sf = scheduledFuncs_.top();
- if (sf.time > now_) {
- break;
- }
- funcs_.emplace(sf.moveOutFunc());
- scheduledFuncs_.pop();
- }
- n = funcs_.size();
- }
- for (count = 0; count < n; count++) {
- {
- std::lock_guard<std::mutex> lock(lock_);
- if (funcs_.empty()) {
- break;
- }
- // Balance the semaphore so it doesn't grow without bound
- // if nobody is calling wait().
- // This may fail (with EAGAIN), that's fine.
- sem_.tryWait();
- func = std::move(funcs_.front());
- funcs_.pop();
- }
- func();
- }
- return count;
- }
- size_t ManualExecutor::drain() {
- size_t tasksRun = 0;
- size_t tasksForSingleRun = 0;
- while ((tasksForSingleRun = run()) != 0) {
- tasksRun += tasksForSingleRun;
- }
- return tasksRun;
- }
- void ManualExecutor::wait() {
- while (true) {
- {
- std::lock_guard<std::mutex> lock(lock_);
- if (!funcs_.empty()) {
- break;
- }
- }
- sem_.wait();
- }
- }
- void ManualExecutor::advanceTo(TimePoint const& t) {
- if (t > now_) {
- now_ = t;
- }
- run();
- }
- } // namespace folly
|