71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
//===- ThreadPoolTaskDispatcher.cpp ---------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Contains the implementation of APIs in the orc-rt/ThreadPoolTaskDispatcher.h
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// header.
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//
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//===----------------------------------------------------------------------===//
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#include "orc-rt/ThreadPoolTaskDispatcher.h"
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#include <cassert>
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namespace orc_rt {
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ThreadPoolTaskDispatcher::~ThreadPoolTaskDispatcher() {
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assert(!AcceptingTasks && "shutdown was not run");
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}
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ThreadPoolTaskDispatcher::ThreadPoolTaskDispatcher(size_t NumThreads) {
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Threads.reserve(NumThreads);
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for (size_t I = 0; I < NumThreads; ++I)
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Threads.emplace_back([this]() { taskLoop(); });
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}
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void ThreadPoolTaskDispatcher::dispatch(std::unique_ptr<Task> T) {
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{
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std::scoped_lock<std::mutex> Lock(M);
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if (!AcceptingTasks)
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return;
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PendingTasks.push_back(std::move(T));
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}
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CV.notify_one();
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}
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void ThreadPoolTaskDispatcher::shutdown() {
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{
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std::scoped_lock<std::mutex> Lock(M);
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assert(AcceptingTasks && "ThreadPoolTaskDispatcher already shut down?");
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AcceptingTasks = false;
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}
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CV.notify_all();
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for (auto &Thread : Threads)
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Thread.join();
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}
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void ThreadPoolTaskDispatcher::taskLoop() {
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while (true) {
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std::unique_ptr<Task> T;
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{
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std::unique_lock<std::mutex> Lock(M);
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CV.wait(Lock,
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[this]() { return !PendingTasks.empty() || !AcceptingTasks; });
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if (!AcceptingTasks && PendingTasks.empty())
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return;
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T = std::move(PendingTasks.back());
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PendingTasks.pop_back();
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}
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T->run();
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}
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}
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} // namespace orc_rt
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