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//
// strand.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2019 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/asio/io_context.hpp>
#include <boost/asio/dispatch.hpp>
#include <boost/asio/post.hpp>
#include <boost/asio/detail/thread.hpp>
#include "unit_test.hpp"
#if defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
# include <boost/asio/deadline_timer.hpp>
#else // defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
# include <boost/asio/steady_timer.hpp>
#endif // defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
#if defined(BOOST_ASIO_HAS_BOOST_BIND)
# include <boost/bind.hpp>
#else // defined(BOOST_ASIO_HAS_BOOST_BIND)
# include <functional>
#endif // defined(BOOST_ASIO_HAS_BOOST_BIND)
using namespace boost::asio;
#if defined(BOOST_ASIO_HAS_BOOST_BIND)
namespace bindns = boost;
#else // defined(BOOST_ASIO_HAS_BOOST_BIND)
namespace bindns = std;
#endif
#if defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
typedef deadline_timer timer;
namespace chronons = boost::posix_time;
#elif defined(BOOST_ASIO_HAS_CHRONO)
typedef steady_timer timer;
namespace chronons = boost::asio::chrono;
#endif // defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
void increment(int* count)
{
++(*count);
}
void increment_without_lock(strand<io_context::executor_type>* s, int* count)
{
BOOST_ASIO_CHECK(!s->running_in_this_thread());
int original_count = *count;
dispatch(*s, bindns::bind(increment, count));
// No other functions are currently executing through the locking dispatcher,
// so the previous call to dispatch should have successfully nested.
BOOST_ASIO_CHECK(*count == original_count + 1);
}
void increment_with_lock(strand<io_context::executor_type>* s, int* count)
{
BOOST_ASIO_CHECK(s->running_in_this_thread());
int original_count = *count;
dispatch(*s, bindns::bind(increment, count));
// The current function already holds the strand's lock, so the
// previous call to dispatch should have successfully nested.
BOOST_ASIO_CHECK(*count == original_count + 1);
}
void sleep_increment(io_context* ioc, int* count)
{
timer t(*ioc, chronons::seconds(2));
t.wait();
++(*count);
}
void increment_by_a(int* count, int a)
{
(*count) += a;
}
void increment_by_a_b(int* count, int a, int b)
{
(*count) += a + b;
}
void increment_by_a_b_c(int* count, int a, int b, int c)
{
(*count) += a + b + c;
}
void increment_by_a_b_c_d(int* count, int a, int b, int c, int d)
{
(*count) += a + b + c + d;
}
void start_sleep_increments(io_context* ioc,
strand<io_context::executor_type>* s, int* count)
{
// Give all threads a chance to start.
timer t(*ioc, chronons::seconds(2));
t.wait();
// Start three increments.
post(*s, bindns::bind(sleep_increment, ioc, count));
post(*s, bindns::bind(sleep_increment, ioc, count));
post(*s, bindns::bind(sleep_increment, ioc, count));
}
void throw_exception()
{
throw 1;
}
void io_context_run(io_context* ioc)
{
ioc->run();
}
void strand_test()
{
io_context ioc;
strand<io_context::executor_type> s = make_strand(ioc);
int count = 0;
post(ioc, bindns::bind(increment_without_lock, &s, &count));
// No handlers can be called until run() is called.
BOOST_ASIO_CHECK(count == 0);
ioc.run();
// The run() call will not return until all work has finished.
BOOST_ASIO_CHECK(count == 1);
count = 0;
ioc.restart();
post(s, bindns::bind(increment_with_lock, &s, &count));
// No handlers can be called until run() is called.
BOOST_ASIO_CHECK(count == 0);
ioc.run();
// The run() call will not return until all work has finished.
BOOST_ASIO_CHECK(count == 1);
count = 0;
ioc.restart();
post(ioc, bindns::bind(start_sleep_increments, &ioc, &s, &count));
boost::asio::detail::thread thread1(bindns::bind(io_context_run, &ioc));
boost::asio::detail::thread thread2(bindns::bind(io_context_run, &ioc));
// Check all events run one after another even though there are two threads.
timer timer1(ioc, chronons::seconds(3));
timer1.wait();
BOOST_ASIO_CHECK(count == 0);
#if defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
timer1.expires_at(timer1.expires_at() + chronons::seconds(2));
#else // defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
timer1.expires_at(timer1.expiry() + chronons::seconds(2));
#endif // defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
timer1.wait();
BOOST_ASIO_CHECK(count == 1);
#if defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
timer1.expires_at(timer1.expires_at() + chronons::seconds(2));
#else // defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
timer1.expires_at(timer1.expiry() + chronons::seconds(2));
#endif // defined(BOOST_ASIO_HAS_BOOST_DATE_TIME)
timer1.wait();
BOOST_ASIO_CHECK(count == 2);
thread1.join();
thread2.join();
// The run() calls will not return until all work has finished.
BOOST_ASIO_CHECK(count == 3);
count = 0;
int exception_count = 0;
ioc.restart();
post(s, throw_exception);
post(s, bindns::bind(increment, &count));
post(s, bindns::bind(increment, &count));
post(s, throw_exception);
post(s, bindns::bind(increment, &count));
// No handlers can be called until run() is called.
BOOST_ASIO_CHECK(count == 0);
BOOST_ASIO_CHECK(exception_count == 0);
for (;;)
{
try
{
ioc.run();
break;
}
catch (int)
{
++exception_count;
}
}
// The run() calls will not return until all work has finished.
BOOST_ASIO_CHECK(count == 3);
BOOST_ASIO_CHECK(exception_count == 2);
count = 0;
ioc.restart();
// Check for clean shutdown when handlers posted through an orphaned strand
// are abandoned.
{
strand<io_context::executor_type> s2 = make_strand(ioc.get_executor());
post(s2, bindns::bind(increment, &count));
post(s2, bindns::bind(increment, &count));
post(s2, bindns::bind(increment, &count));
}
// No handlers can be called until run() is called.
BOOST_ASIO_CHECK(count == 0);
}
BOOST_ASIO_TEST_SUITE
(
"strand",
BOOST_ASIO_TEST_CASE(strand_test)
)
|
