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+//===-- llvm/Support/ThreadPool.h - A ThreadPool implementation -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a crude C++11 based thread pool.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_THREAD_POOL_H
+#define LLVM_SUPPORT_THREAD_POOL_H
+
+#include "llvm/Support/thread.h"
+
+#include <future>
+
+#include <atomic>
+#include <condition_variable>
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <queue>
+#include <utility>
+
+namespace llvm {
+
+/// A ThreadPool for asynchronous parallel execution on a defined number of
+/// threads.
+///
+/// The pool keeps a vector of threads alive, waiting on a condition variable
+/// for some work to become available.
+class ThreadPool {
+public:
+ using TaskTy = std::function<void()>;
+ using PackagedTaskTy = std::packaged_task<void()>;
+
+ /// Construct a pool with the number of threads found by
+ /// hardware_concurrency().
+ ThreadPool();
+
+ /// Construct a pool of \p ThreadCount threads
+ ThreadPool(unsigned ThreadCount);
+
+ /// Blocking destructor: the pool will wait for all the threads to complete.
+ ~ThreadPool();
+
+ /// Asynchronous submission of a task to the pool. The returned future can be
+ /// used to wait for the task to finish and is *non-blocking* on destruction.
+ template <typename Function, typename... Args>
+ inline std::shared_future<void> async(Function &&F, Args &&... ArgList) {
+ auto Task =
+ std::bind(std::forward<Function>(F), std::forward<Args>(ArgList)...);
+ return asyncImpl(std::move(Task));
+ }
+
+ /// Asynchronous submission of a task to the pool. The returned future can be
+ /// used to wait for the task to finish and is *non-blocking* on destruction.
+ template <typename Function>
+ inline std::shared_future<void> async(Function &&F) {
+ return asyncImpl(std::forward<Function>(F));
+ }
+
+ /// Blocking wait for all the threads to complete and the queue to be empty.
+ /// It is an error to try to add new tasks while blocking on this call.
+ void wait();
+
+private:
+ /// Asynchronous submission of a task to the pool. The returned future can be
+ /// used to wait for the task to finish and is *non-blocking* on destruction.
+ std::shared_future<void> asyncImpl(TaskTy F);
+
+ /// Threads in flight
+ std::vector<llvm::thread> Threads;
+
+ /// Tasks waiting for execution in the pool.
+ std::queue<PackagedTaskTy> Tasks;
+
+ /// Locking and signaling for accessing the Tasks queue.
+ std::mutex QueueLock;
+ std::condition_variable QueueCondition;
+
+ /// Locking and signaling for job completion
+ std::mutex CompletionLock;
+ std::condition_variable CompletionCondition;
+
+ /// Keep track of the number of thread actually busy
+ std::atomic<unsigned> ActiveThreads;
+
+#if LLVM_ENABLE_THREADS // avoids warning for unused variable
+ /// Signal for the destruction of the pool, asking thread to exit.
+ bool EnableFlag;
+#endif
+};
+}
+
+#endif // LLVM_SUPPORT_THREAD_POOL_H