98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
/* This file is part of the Pangolin Project.
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* http://github.com/stevenlovegrove/Pangolin
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*
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* Copyright (c) 2011 Steven Lovegrove
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#include <iostream>
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#include <streambuf>
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#include <fstream>
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#include <pangolin/platform.h>
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#include <thread>
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#include <mutex>
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#include <condition_variable>
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#ifdef _LINUX_
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// On linux, using posix file i/o to allow sync writes.
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#define USE_POSIX_FILE_IO
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#endif
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namespace pangolin
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{
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class PANGOLIN_EXPORT threadedfilebuf : public std::streambuf
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{
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public:
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~threadedfilebuf();
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threadedfilebuf();
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threadedfilebuf(const std::string& filename, size_t buffer_size_bytes);
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void open(const std::string& filename, size_t buffer_size_bytes);
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void close();
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void force_close();
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void operator()();
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protected:
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void soft_close();
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//! Override streambuf::xsputn for asynchronous write
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std::streamsize xsputn(const char * s, std::streamsize n) override;
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//! Override streambuf::overflow for asynchronous write
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int overflow(int c) override;
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std::streampos seekoff(
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std::streamoff off, std::ios_base::seekdir way,
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std::ios_base::openmode which = std::ios_base::in | std::ios_base::out
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) override;
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#ifdef USE_POSIX_FILE_IO
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int filenum = -1;
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#else
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std::filebuf file;
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#endif
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char* mem_buffer;
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std::streamsize mem_size;
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std::streamsize mem_max_size;
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std::streamsize mem_start;
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std::streamsize mem_end;
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std::streampos input_pos;
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std::mutex update_mutex;
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std::condition_variable cond_queued;
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std::condition_variable cond_dequeued;
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std::thread write_thread;
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bool should_run;
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bool is_pipe;
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};
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}
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