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https://github.com/nestriness/cdc-file-transfer.git
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4326e972ac
The tools allow efficient and fast synchronization of large directory trees from a Windows workstation to a Linux target machine. cdc_rsync* support efficient copy of files by using content-defined chunking (CDC) to identify chunks within files that can be reused. asset_stream_manager + cdc_fuse_fs support efficient streaming of a local directory to a remote virtual file system based on FUSE. It also employs CDC to identify and reuse unchanged data chunks.
104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
/*
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* Copyright 2022 Google LLC
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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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#ifndef COMMON_THREADPOOL_H_
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#define COMMON_THREADPOOL_H_
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#include <atomic>
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#include <condition_variable>
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#include <functional>
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#include <memory>
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#include <queue>
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#include <thread>
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#include <vector>
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#include "absl/synchronization/mutex.h"
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namespace cdc_ft {
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class Task {
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public:
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using IsCancelledPredicate = std::function<bool()>;
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virtual ~Task() = default;
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// Method that's doing all the work.
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// Called on a background thread.
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virtual void ThreadRun(IsCancelledPredicate is_cancelled) = 0;
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};
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// Manages a pool of worker threads and schedules tasks to run on the threads.
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class Threadpool {
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public:
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// Creates a new thread pool with |num_threads| worker threads.
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explicit Threadpool(size_t num_threads);
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~Threadpool();
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// Waits for all queued tasks to finish.
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void Wait() ABSL_LOCKS_EXCLUDED(task_queue_mutex_);
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// Stops the worker threads. Cancels currently active tasks.
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void Shutdown() ABSL_LOCKS_EXCLUDED(task_queue_mutex_);
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// Queues a task for execution in a worker thread.
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void QueueTask(std::unique_ptr<Task> task)
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ABSL_LOCKS_EXCLUDED(task_queue_mutex_);
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// If available, returns the next completed task.
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// For a single worker thread (|num_threads| == 1), tasks are completed in
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// FIFO order. This is no longer the case for multiple threads
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// (|num_threads| > 1). Tasks that got queued later might complete first.
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std::unique_ptr<Task> TryGetCompletedTask()
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ABSL_LOCKS_EXCLUDED(completed_tasks_mutex_);
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// Returns the next completed task, possibly blocking until it is available.
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// For a single worker thread (|num_threads| == 1), tasks are completed in
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// FIFO order. This is no longer the case for multiple threads
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// (|num_threads| > 1). Tasks that got queued later might complete first.
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std::unique_ptr<Task> GetCompletedTask()
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ABSL_LOCKS_EXCLUDED(completed_tasks_mutex_);
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// Returns the total number of worker threads in the pool.
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size_t NumThreads() const { return workers_.size(); }
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// Returns the number of tasks that are either queued or in progress.
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size_t NumQueuedTasks() const ABSL_LOCKS_EXCLUDED(task_queue_mutex_) {
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absl::ReaderMutexLock lock(&task_queue_mutex_);
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return outstanding_task_count_;
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}
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private:
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// Background thread worker method. Picks tasks and runs them.
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void ThreadWorkerMain()
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ABSL_LOCKS_EXCLUDED(task_queue_mutex_, completed_tasks_mutex_);
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mutable absl::Mutex task_queue_mutex_;
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std::queue<std::unique_ptr<Task>> task_queue_
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ABSL_GUARDED_BY(task_queue_mutex_);
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size_t outstanding_task_count_ ABSL_GUARDED_BY(task_queue_mutex_) = 0;
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std::atomic_bool shutdown_ ABSL_GUARDED_BY(task_queue_mutex_);
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absl::Mutex completed_tasks_mutex_;
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std::queue<std::unique_ptr<Task>> completed_tasks_
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ABSL_GUARDED_BY(completed_tasks_mutex_);
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std::vector<std::thread> workers_;
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};
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} // namespace cdc_ft
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#endif // COMMON_THREADPOOL_H_
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