Ichthyostega
6735857f3b
Intended as replacement for the Mutex/ConditionVar based barrier built into the exiting Lumiera thread handling framework and used to ensure safe hand-over of a bound functor into the starting new thread. The standard requires a comparable guarantee for the C++17 concurrency framework, expressed as a "synchronizes_with" assertion along the lines of the Atomics framework. While in most cases dedicated synchronisation is thus not required anymore when swtiching to C++17, some special extended use cases remain to be addressed, where the complete initialisation of further support framework must be ensured. With C++20 this would be easy to achieve with a std::latch, so we need a simple workaround for the time being. After consideration of the typical use case, I am aiming at a middle ground in terms of performance, by using a yield-wait until satisfying the latch condition.
93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
/*
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ThreadWrapperSelfRecognitionTest(Test) - detect when code is running within a thread
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Copyright (C) Lumiera.org
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2017, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file thread-wrapper-self-recognition-test.cpp
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** unit test \ref ThreadWrapperSelfRecognitionTest_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/test/test-helper.hpp"
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#include "lib/thread.hpp"
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#include "lib/error.hpp"
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using test::Test;
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namespace lib {
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namespace test {
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namespace {
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class TestThread
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: Thread
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{
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public:
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TestThread()
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: Thread{"test Thread self recognition"
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,[&]()
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{
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CHECK (invocation_happens_within_this_thread());
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}}
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{ }
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bool
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invocation_happens_within_this_thread()
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{
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return invokedWithinThread();
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}
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};
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}
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/******************************************************//**
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* @test verify the ability of a thread to detect code
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* executing within the thread itself.
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*
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* @see Thread::invokedWithinThread()
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* @see steam::control::DispatcherLoop::stateIsSynched()
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*/
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class ThreadWrapperSelfRecognitionTest_test : public Test
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{
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virtual void
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run (Arg)
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{
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TestThread testThread;
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CHECK (not testThread.invocation_happens_within_this_thread());
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usleep(10); // give the thread a chance to run before shutdown
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}
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};
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/** Register this test class... */
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LAUNCHER (ThreadWrapperSelfRecognitionTest_test, "function common");
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}} // namespace lib::test
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