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107 lines
2.6 KiB
C++
107 lines
2.6 KiB
C++
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// Copyright Oliver Kowalke 2009.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#define BOOST_PP_LIMIT_MAG 10
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#include <cstdio>
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#include <cstdlib>
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#include <iostream>
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#include <stdexcept>
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#include <boost/assert.hpp>
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#include <boost/atomic.hpp>
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#include <boost/bind.hpp>
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#include <boost/lockfree/queue.hpp>
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#include <boost/lockfree/queue.hpp>
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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#include <boost/thread/thread.hpp>
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#include "zeit.hpp"
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boost::atomic_int producer_count(0);
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boost::atomic_int consumer_count(0);
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boost::lockfree::queue< int > queue( 128);
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const int iterations = 500000;
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const int producer_thread_count = 4;
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const int consumer_thread_count = 4;
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void producer(void)
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{
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for (int i = 0; i != iterations; ++i) {
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int value = ++producer_count;
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while (!queue.push(value))
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;
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}
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}
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boost::atomic<bool> done (false);
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void consumer(void)
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{
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int value;
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while (!done) {
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while (queue.pop(value))
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++consumer_count;
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}
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while (queue.pop(value))
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++consumer_count;
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}
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zeit_t test_zeit( zeit_t ov)
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{
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std::cout << "boost::lockfree::queue is ";
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if (!queue.is_lock_free())
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std::cout << "not ";
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std::cout << "lockfree" << std::endl;
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boost::thread_group producer_threads, consumer_threads;
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// start measurement
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zeit_t start( zeit() );
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for (int i = 0; i != producer_thread_count; ++i)
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producer_threads.create_thread(producer);
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for (int i = 0; i != consumer_thread_count; ++i)
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consumer_threads.create_thread(consumer);
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producer_threads.join_all();
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done = true;
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consumer_threads.join_all();
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// stop measurement
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zeit_t total( zeit() - start);
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std::cout << "produced " << producer_count << " objects." << std::endl;
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std::cout << "consumed " << consumer_count << " objects." << std::endl;
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// we have two jumps and two measuremt-overheads
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total -= ov; // overhead of measurement
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return total;
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}
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int main( int argc, char * argv[])
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{
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try
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{
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zeit_t ov( overhead_zeit() );
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std::cout << "\noverhead for clock_gettime() == " << ov << " ns" << std::endl;
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unsigned int res = test_zeit( ov);
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std::cout << "lockfree::queue< int >: " << (res/1000000) << " ms" << std::endl;
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return EXIT_SUCCESS;
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}
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catch ( std::exception const& e)
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{ std::cerr << "exception: " << e.what() << std::endl; }
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catch (...)
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{ std::cerr << "unhandled exception" << std::endl; }
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return EXIT_FAILURE;
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}
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