mirror of
https://github.com/nestriness/cdc-file-transfer.git
synced 2026-01-30 12:25:35 +02:00
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.
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
/*
|
|
* Copyright 2022 Google LLC
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef COMMON_SEMAPHORE_H_
|
|
#define COMMON_SEMAPHORE_H_
|
|
|
|
#include <condition_variable>
|
|
#include <mutex>
|
|
|
|
namespace cdc_ft {
|
|
|
|
// Standard semaphore. Can be replaced by std::counting_semaphore in C++20.
|
|
// Not fair! Wait() does not unlock in FIFO order.
|
|
class Semaphore {
|
|
public:
|
|
// Initialize the semaphore with |initial_count|. The count indicates how
|
|
// often Wait() can be called without blocking. There is no max count.
|
|
explicit Semaphore(int initial_count);
|
|
~Semaphore();
|
|
|
|
// If the count is larger than zero, decreases the count and returns
|
|
// immediately. If the count is zero, blocks until some other thread calls
|
|
// Signal() and decreases the count.
|
|
// This method is thread-safe.
|
|
void Wait();
|
|
|
|
// Increases the count.
|
|
// This method is thread-safe.
|
|
void Signal();
|
|
|
|
private:
|
|
uint32_t count_;
|
|
std::mutex mutex_;
|
|
std::condition_variable condition_;
|
|
};
|
|
|
|
} // namespace cdc_ft
|
|
|
|
#endif // COMMON_SEMAPHORE_H_
|