77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
// Copyright 2015 Google LLC. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef PACKAGER_FILE_THREADED_IO_FILE_H_
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#define PACKAGER_FILE_THREADED_IO_FILE_H_
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#include <atomic>
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#include <memory>
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#include <absl/synchronization/mutex.h>
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#include <packager/file/file.h>
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#include <packager/file/file_closer.h>
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#include <packager/file/io_cache.h>
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namespace shaka {
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/// Declaration of class which implements a thread-safe circular buffer.
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class ThreadedIoFile : public File {
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public:
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enum Mode { kInputMode, kOutputMode };
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ThreadedIoFile(std::unique_ptr<File, FileCloser> internal_file,
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Mode mode,
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uint64_t io_cache_size,
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uint64_t io_block_size);
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/// @name File implementation overrides.
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/// @{
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bool Close() override;
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int64_t Read(void* buffer, uint64_t length) override;
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int64_t Write(const void* buffer, uint64_t length) override;
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void CloseForWriting() override;
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int64_t Size() override;
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bool Flush() override;
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bool Seek(uint64_t position) override;
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bool Tell(uint64_t* position) override;
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/// @}
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protected:
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~ThreadedIoFile() override;
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bool Open() override;
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private:
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// Internal task handler implementation. Will dispatch to either
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// |RunInInputMode| or |RunInOutputMode| depending on |mode_|.
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void TaskHandler();
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void RunInInputMode();
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void RunInOutputMode();
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void WaitForSignal(absl::Mutex* mutex, bool* condition);
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std::unique_ptr<File, FileCloser> internal_file_;
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const Mode mode_;
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IoCache cache_;
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std::vector<uint8_t> io_buffer_;
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uint64_t position_;
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uint64_t size_;
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std::atomic<bool> eof_;
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std::atomic<int64_t> internal_file_error_;
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absl::Mutex flush_mutex_;
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bool flushing_ ABSL_GUARDED_BY(flush_mutex_);
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bool flush_complete_ ABSL_GUARDED_BY(flush_mutex_);
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absl::Mutex task_exited_mutex_;
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bool task_exited_ ABSL_GUARDED_BY(task_exited_mutex_);
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DISALLOW_COPY_AND_ASSIGN(ThreadedIoFile);
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};
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} // namespace shaka
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#endif // PACKAGER_FILE_THREADED_IO_FILE_H
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