| //===----------------------------------------------------------------------===// |
| // |
| // 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(); |
| } |