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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.
53 lines
1.5 KiB
C++
53 lines
1.5 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_SEMAPHORE_H_
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#define COMMON_SEMAPHORE_H_
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#include <condition_variable>
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#include <mutex>
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namespace cdc_ft {
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// Standard semaphore. Can be replaced by std::counting_semaphore in C++20.
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// Not fair! Wait() does not unlock in FIFO order.
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class Semaphore {
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public:
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// Initialize the semaphore with |initial_count|. The count indicates how
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// often Wait() can be called without blocking. There is no max count.
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explicit Semaphore(int initial_count);
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~Semaphore();
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// If the count is larger than zero, decreases the count and returns
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// immediately. If the count is zero, blocks until some other thread calls
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// Signal() and decreases the count.
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// This method is thread-safe.
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void Wait();
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// Increases the count.
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// This method is thread-safe.
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void Signal();
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private:
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uint32_t count_;
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std::mutex mutex_;
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std::condition_variable condition_;
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};
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} // namespace cdc_ft
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#endif // COMMON_SEMAPHORE_H_
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