81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
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#pragma once
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#ifndef MESSMER_CPPUTILS_RANDOM_THREADSAFERANDOMDATABUFFER_H
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#define MESSMER_CPPUTILS_RANDOM_THREADSAFERANDOMDATABUFFER_H
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#include "../data/Data.h"
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#include "../assert/assert.h"
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#include "RandomDataBuffer.h"
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#include <boost/thread.hpp>
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namespace cpputils {
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//TODO Test
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class ThreadsafeRandomDataBuffer {
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public:
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ThreadsafeRandomDataBuffer();
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size_t size() const;
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void get(void *target, size_t numBytes);
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void add(Data data);
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void waitUntilSizeIsLessThan(size_t numBytes);
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private:
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size_t _get(void *target, size_t bytes);
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RandomDataBuffer _buffer;
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mutable boost::mutex _mutex;
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boost::condition_variable _dataAddedCv;
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// _dataGottenCv needs to be boost::condition_variable and not std::condition_variable, because the
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// RandomGeneratorThread calling ThreadsafeRandomDataBuffer::waitUntilSizeIsLessThan() needs the waiting to be
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// interruptible to stop the thread in RandomGeneratorThread::stop() or in the RandomGeneratorThread destructor.
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boost::condition_variable _dataGottenCv;
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DISALLOW_COPY_AND_ASSIGN(ThreadsafeRandomDataBuffer);
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};
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inline ThreadsafeRandomDataBuffer::ThreadsafeRandomDataBuffer() {
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}
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inline size_t ThreadsafeRandomDataBuffer::size() const {
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boost::unique_lock<boost::mutex> lock(_mutex);
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return _buffer.size();
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}
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inline void ThreadsafeRandomDataBuffer::get(void *target, size_t numBytes) {
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size_t alreadyGotten = 0;
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while (alreadyGotten < numBytes) {
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size_t got = _get(static_cast<uint8_t*>(target)+alreadyGotten, numBytes);
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alreadyGotten += got;
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ASSERT(alreadyGotten <= numBytes, "Got too many bytes");
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}
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}
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inline size_t ThreadsafeRandomDataBuffer::_get(void *target, size_t numBytes) {
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boost::unique_lock<boost::mutex> lock(_mutex);
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_dataAddedCv.wait(lock, [this, numBytes] {
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return _buffer.size() > 0;
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});
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size_t gettableBytes = std::min(_buffer.size(), numBytes);
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_buffer.get(target, gettableBytes);
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_dataGottenCv.notify_all();
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return gettableBytes;
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}
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inline void ThreadsafeRandomDataBuffer::add(Data data) {
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boost::unique_lock<boost::mutex> lock(_mutex);
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_buffer.add(std::move(data));
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_dataAddedCv.notify_all();
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}
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inline void ThreadsafeRandomDataBuffer::waitUntilSizeIsLessThan(size_t numBytes) {
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boost::unique_lock<boost::mutex> lock(_mutex);
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_dataGottenCv.wait(lock, [this, numBytes] {
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return _buffer.size() < numBytes;
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});
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}
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}
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#endif
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