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- //===----------------------------------------------------------------------===//
- //
- // The LLVM Compiler Infrastructure
- //
- // This file is dual licensed under the MIT and the University of Illinois Open
- // Source Licenses. See LICENSE.TXT for details.
- //
- //===----------------------------------------------------------------------===//
- // Copyright (C) 2017 Austin J. Beer
- //
- // 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)
- // <boost/thread/condition_variable>
- // class condition_variable;
- // condition_variable(const condition_variable&) = delete;
- #include <iostream>
- #include <boost/thread/condition_variable.hpp>
- #include <boost/thread/mutex.hpp>
- #include <boost/thread/thread.hpp>
- #include <boost/detail/lightweight_test.hpp>
- #include <cassert>
- // Summary of each test:
- // 1. Start the test thread and wait for it to start up.
- // The test thread waits for the flag to be set using a large timeout.
- // 2. The main thread takes the lock and then sleeps for a long time while holding
- // the lock before setting the flag and calling notify_one(). If the wait
- // function being tested is polling pthread_cond_timedwait() internally, any
- // notifications sent after pthread_cond_timedwait() times out but before it can
- // reacquire the lock may be "lost". pthread_cond_timedwait() will report that
- // it timed out and the wait function may incorrectly assume that no
- // notification was received. This test ensures that that doesn't happen.
- // 3. Measure how it takes the test thread to return. If it received the
- // notification, it will return fairly quickly. If it missed the notification,
- // the test thread won't return until the wait function being tested times out.
- //------------------------------------------------------------------------------
- boost::condition_variable cv;
- boost::mutex mut;
- bool flag;
- bool waiting;
- bool flagIsSet()
- {
- return flag;
- }
- bool threadIsWaiting()
- {
- return waiting;
- }
- //------------------------------------------------------------------------------
- #ifdef BOOST_THREAD_USES_DATETIME
- boost::posix_time::milliseconds posix_wait_time(1000);
- template <typename F>
- void test_posix_wait_function(F f)
- {
- flag = false;
- waiting = false;
- boost::thread t(f);
- while (!threadIsWaiting())
- {
- boost::this_thread::sleep(boost::posix_time::milliseconds(1));
- }
- boost::unique_lock<boost::mutex> lk(mut);
- boost::this_thread::sleep(boost::posix_time::milliseconds(500));
- boost::posix_time::ptime t0 = boost::posix_time::microsec_clock::universal_time();
- flag = true;
- cv.notify_one();
- lk.unlock();
- t.join();
- boost::posix_time::ptime t1 = boost::posix_time::microsec_clock::universal_time();
- BOOST_TEST(t1 - t0 < boost::posix_time::milliseconds(250));
- }
- //------------------------------------------------------------------------------
- void timed_wait_absolute_without_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- while (!flagIsSet())
- {
- cv.timed_wait(lk, boost::posix_time::microsec_clock::universal_time() + posix_wait_time);
- }
- }
- void timed_wait_absolute_with_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- cv.timed_wait(lk, boost::posix_time::microsec_clock::universal_time() + posix_wait_time, flagIsSet);
- }
- //------------------------------------------------------------------------------
- void timed_wait_relative_without_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- while (!flagIsSet())
- {
- cv.timed_wait(lk, posix_wait_time);
- }
- }
- void timed_wait_relative_with_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- cv.timed_wait(lk, posix_wait_time, flagIsSet);
- }
- #else
- #error "Test not applicable: BOOST_THREAD_USES_DATETIME not defined for this platform as not supported"
- #endif
- //------------------------------------------------------------------------------
- #ifdef BOOST_THREAD_USES_CHRONO
- boost::chrono::milliseconds chrono_wait_time(1000);
- template <typename F>
- void test_chrono_wait_function(F f)
- {
- flag = false;
- waiting = false;
- boost::thread t(f);
- while (!threadIsWaiting())
- {
- boost::this_thread::sleep_for(boost::chrono::milliseconds(1));
- }
- boost::unique_lock<boost::mutex> lk(mut);
- boost::this_thread::sleep_for(boost::chrono::milliseconds(500));
- boost::chrono::steady_clock::time_point t0 = boost::chrono::steady_clock::now();
- flag = true;
- cv.notify_one();
- lk.unlock();
- t.join();
- boost::chrono::steady_clock::time_point t1 = boost::chrono::steady_clock::now();
- BOOST_TEST(t1 - t0 < boost::chrono::milliseconds(250));
- }
- //------------------------------------------------------------------------------
- void wait_until_system_without_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- while (!flagIsSet())
- {
- cv.wait_until(lk, boost::chrono::system_clock::now() + chrono_wait_time);
- }
- }
- void wait_until_system_with_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- cv.wait_until(lk, boost::chrono::system_clock::now() + chrono_wait_time, flagIsSet);
- }
- //------------------------------------------------------------------------------
- void wait_until_steady_without_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- while (!flagIsSet())
- {
- cv.wait_until(lk, boost::chrono::steady_clock::now() + chrono_wait_time);
- }
- }
- void wait_until_steady_with_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- cv.wait_until(lk, boost::chrono::steady_clock::now() + chrono_wait_time, flagIsSet);
- }
- //------------------------------------------------------------------------------
- void wait_for_without_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- while (!flagIsSet())
- {
- cv.wait_for(lk, chrono_wait_time);
- }
- }
- void wait_for_with_pred()
- {
- boost::unique_lock<boost::mutex> lk(mut);
- waiting = true;
- cv.wait_for(lk, chrono_wait_time, flagIsSet);
- }
- #else
- #error "Test not applicable: BOOST_THREAD_USES_CHRONO not defined for this platform as not supported"
- #endif
- //------------------------------------------------------------------------------
- int main()
- {
- #ifdef BOOST_THREAD_USES_DATETIME
- test_posix_wait_function(timed_wait_absolute_without_pred);
- test_posix_wait_function(timed_wait_absolute_with_pred);
- test_posix_wait_function(timed_wait_relative_without_pred);
- test_posix_wait_function(timed_wait_relative_with_pred);
- #endif
- #ifdef BOOST_THREAD_USES_CHRONO
- test_chrono_wait_function(wait_until_system_without_pred);
- test_chrono_wait_function(wait_until_system_with_pred);
- test_chrono_wait_function(wait_until_steady_without_pred);
- test_chrono_wait_function(wait_until_steady_with_pred);
- test_chrono_wait_function(wait_for_without_pred);
- test_chrono_wait_function(wait_for_with_pred);
- #endif
- return boost::report_errors();
- }
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