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.
126 lines
3.4 KiB
C++
126 lines
3.4 KiB
C++
/*
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SyncWaiting(Test) - check the monitor object based wait/notification
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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-waiting-test.cpp
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** unit test \ref SyncWaiting_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/thread.hpp"
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#include "lib/sync.hpp"
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#include <atomic>
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using test::Test;
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using std::atomic_uint;
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using std::atomic_bool;
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using std::this_thread::sleep_for;
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using std::chrono_literals::operator ""ms;
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namespace lib {
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namespace test{
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namespace { // test subject...
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/** demonstrates how to wait on a simple boolean flag */
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class SyncOnBool
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: public Sync<NonrecursiveLock_Waitable>
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{
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atomic_uint sum_{0}, input_{0};
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atomic_bool got_new_data_{false};
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public:
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void getIt()
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{
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Lock await{this, [&]{ return bool(got_new_data_); }};
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sum_ += input_;
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}
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void provide (uint val)
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{
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Lock sync{this};
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input_ = val;
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got_new_data_ = true;
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sync.notify_all();
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}
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/** harvesting the result...*/
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uint result () { return sum_; }
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};
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}//(End) test subject.
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/************************************************************************//**
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* @test concurrent waiting and notification, implemented via object monitor.
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* This test covers the second part of the monitor pattern, which builds upon
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* the locking part, additionally using an embedded condition. Two interwoven
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* threads are created, both blocked until a start value is given. Once awakened,
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* each thread should add the start value to a common sum field.
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* @see SyncLocking_test
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* @see sync.hpp
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*/
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class SyncWaiting_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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SyncOnBool token;
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ThreadJoinable ping ("SyncWaiting ping", [&]{ token.getIt(); });
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ThreadJoinable pong ("SyncWaiting pong", [&]{ token.getIt(); });
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CHECK (ping);
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CHECK (pong);
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CHECK (0 == token.result());
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sleep_for (100ms); // if the threads don't block correctly, they've missed their chance by now...
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// kick off the notification cascade...
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uint val = (rand() % 1000);
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token.provide (val);
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// wait for the two Threads to finish their handshake
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pong.join();
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ping.join();
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CHECK (2*val == token.result());
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}
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};
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/** Register this test class... */
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LAUNCHER (SyncWaiting_test, "unit common");
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}} // namespace lib::test
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