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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)
- )
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