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//
// strand.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Disable autolinking for unit tests.
#if !defined(BOOST_ALL_NO_LIB)
#define BOOST_ALL_NO_LIB 1
#endif // !defined(BOOST_ALL_NO_LIB)
// Test that header file is self-contained.
#include <boost/asio/strand.hpp>
#include <sstream>
#include <boost/bind.hpp>
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include "unit_test.hpp"
using namespace boost::asio;
void increment(int* count)
{
++(*count);
}
void increment_without_lock(strand* s, int* count)
{
int original_count = *count;
s->dispatch(boost::bind(increment, count));
// No other functions are currently executing through the locking dispatcher,
// so the previous call to dispatch should have successfully nested.
BOOST_CHECK(*count == original_count + 1);
}
void increment_with_lock(strand* s, int* count)
{
int original_count = *count;
s->dispatch(boost::bind(increment, count));
// The current function already holds the strand's lock, so the
// previous call to dispatch should have successfully nested.
BOOST_CHECK(*count == original_count + 1);
}
void sleep_increment(io_service* ios, int* count)
{
deadline_timer t(*ios, boost::posix_time::seconds(2));
t.wait();
++(*count);
}
void start_sleep_increments(io_service* ios, strand* s, int* count)
{
// Give all threads a chance to start.
deadline_timer t(*ios, boost::posix_time::seconds(2));
t.wait();
// Start three increments.
s->post(boost::bind(sleep_increment, ios, count));
s->post(boost::bind(sleep_increment, ios, count));
s->post(boost::bind(sleep_increment, ios, count));
}
void throw_exception()
{
throw 1;
}
void io_service_run(io_service* ios)
{
ios->run();
}
void strand_test()
{
io_service ios;
strand s(ios);
int count = 0;
ios.post(boost::bind(increment_without_lock, &s, &count));
// No handlers can be called until run() is called.
BOOST_CHECK(count == 0);
ios.run();
// The run() call will not return until all work has finished.
BOOST_CHECK(count == 1);
count = 0;
ios.reset();
s.post(boost::bind(increment_with_lock, &s, &count));
// No handlers can be called until run() is called.
BOOST_CHECK(count == 0);
ios.run();
// The run() call will not return until all work has finished.
BOOST_CHECK(count == 1);
count = 0;
ios.reset();
ios.post(boost::bind(start_sleep_increments, &ios, &s, &count));
boost::thread thread1(boost::bind(io_service_run, &ios));
boost::thread thread2(boost::bind(io_service_run, &ios));
// Check all events run one after another even though there are two threads.
deadline_timer timer1(ios, boost::posix_time::seconds(3));
timer1.wait();
BOOST_CHECK(count == 0);
timer1.expires_at(timer1.expires_at() + boost::posix_time::seconds(2));
timer1.wait();
BOOST_CHECK(count == 1);
timer1.expires_at(timer1.expires_at() + boost::posix_time::seconds(2));
timer1.wait();
BOOST_CHECK(count == 2);
thread1.join();
thread2.join();
// The run() calls will not return until all work has finished.
BOOST_CHECK(count == 3);
count = 0;
int exception_count = 0;
ios.reset();
s.post(throw_exception);
s.post(boost::bind(increment, &count));
s.post(boost::bind(increment, &count));
s.post(throw_exception);
s.post(boost::bind(increment, &count));
// No handlers can be called until run() is called.
BOOST_CHECK(count == 0);
BOOST_CHECK(exception_count == 0);
for (;;)
{
try
{
ios.run();
break;
}
catch (int)
{
++exception_count;
}
}
// The run() calls will not return until all work has finished.
BOOST_CHECK(count == 3);
BOOST_CHECK(exception_count == 2);
}
test_suite* init_unit_test_suite(int argc, char* argv[])
{
test_suite* test = BOOST_TEST_SUITE("strand");
test->add(BOOST_TEST_CASE(&strand_test));
return test;
}
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