Ichthyostega
685be1b039
This is Step-2 : change the API towards application Notably all invocation variants to support member functions or a reference to bool flags are retracted, since today a λ-binding directly at usage site tends to be more readable. The function names are harmonised with the C++ standard and emergency shutdown in the Subsystem-Runner is rationalised. The old thread-wrapper test is repurposed to demonstrate the effectiveness of monitor based locking.
98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
/*
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SyncTimedwait(Test) - check the monitor object based timed condition wait
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Copyright (C) Lumiera.org
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2008, 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 sync-timedwait-test.cpp
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** unit test \ref SyncTimedwait_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/error.hpp"
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#include "lib/sync.hpp"
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#include <chrono>
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using test::Test;
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using std::chrono::system_clock;
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using std::chrono::milliseconds;
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namespace lib {
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namespace test{
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namespace { // test parameters...
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const uint WAIT_mSec = 20; ///< milliseconds to wait before timeout
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const milliseconds TIMEOUT{WAIT_mSec};
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using CLOCK_SCALE = std::milli; // Results are in ms
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using Dur = std::chrono::duration<double, CLOCK_SCALE>;
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}//(End) parameters
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/****************************************************************************//**
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* @test timeout feature on condition wait as provided by the underlying implementation
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* and accessible via the object monitor based locking/waiting mechanism. Without
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* creating multiple threads, we engage into a blocking wait, which aborts due to
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* setting a timeout.
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* @see SyncWaiting_test
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* @see sync.hpp
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*/
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class SyncTimedwait_test
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: public Test,
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Sync<NonrecursiveLock_Waitable>
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{
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friend class Lock; // allows inheriting privately from Sync
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virtual void
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run (Arg)
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{
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Lock lock{this};
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auto start = system_clock::now();
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auto salvation = []{ return false; };
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bool fulfilled = lock.wait_for (TIMEOUT, salvation);
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CHECK (not fulfilled); // condition not fulfilled, but timeout
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Dur duration = system_clock::now () - start;
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CHECK (WAIT_mSec <= duration.count());
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CHECK (duration.count() < 2*WAIT_mSec);
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}
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};
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/** Register this test class... */
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LAUNCHER (SyncTimedwait_test, "unit common");
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}} // namespace lib::test
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