Ichthyostega
416895b5b2
The investigation for #1279 leads to the following conclusions - the features and the design of our custom thread-wrapper almost entirely matches the design chosen meanwhile by the C++ committee - the implementation provided by the standard library however uses modern techniques (especially Atomics) and is more precisely worked out than our custom implementation was. - we do not need an *active* threadpool with work-assignment, rather we'll use *active* workers and a *passive* pool, which was easy to implement based on C++17 features ==> decision to drop our POSIX based custom implementation and to retrofit the Thread-wrapper as a drop-in replacement +++ start this refactoring by moving code into the Library +++ create a copy of the Threadwrapper-code to build and test the refactorings while the application itself still uses existing code, until the transition is complete
107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
/*
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SyncClasslock(Test) - validate the type-based Monitor locking
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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-classlock-test.cpp
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** unit test \ref SyncClasslock_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/sync-classlock.hpp"
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#include "lib/scoped-collection.hpp"
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#include "lib/thread.hpp"
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using test::Test;
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//using vault::ThreadJoinable; //////////////////WIP
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namespace lib {
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namespace test {
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namespace { // Parameters for multithreaded contention test
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const uint NUM_THREADS = 20; ///< number of contending threads to create
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const uint NUM_LOOP = 1000; ///< number of loop iterations per thread
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}
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/**********************************************************************//**
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* @test check proper handling of class (not instance)-based Monitor locks.
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* Because no instance is available in this case, a hidden storage for the
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* Monitor object needs to be provided in a way safe for use even in the
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* static startup/shutdown phase. This can not directly validate this
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* allocation of a shared monitor object behind the scenes, but it
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* can verify the monitor is indeed shared by all ClassLock instances
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* templated to a specific type.
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*
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* @see sync.hpp
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*/
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class SyncClasslock_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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int contended = 0;
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using Threads = lib::ScopedCollection<ThreadJoinable>;
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// Start a bunch of threads with random access pattern
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Threads threads{NUM_THREADS,
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[&](Threads::ElementHolder& storage)
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{
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storage.create<ThreadJoinable> ("Sync-ClassLock stress test"
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,[&]{
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for (uint i=0; i<NUM_LOOP; ++i)
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{
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uint delay = rand() % 10;
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usleep (delay);
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{
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ClassLock<void> guard;
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++contended;
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}
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}
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});
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}
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};
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for (auto& thread : threads)
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thread.join(); // block until thread terminates
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CHECK (contended == NUM_THREADS * NUM_LOOP,
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"ALARM: Lock failed, concurrent modification "
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"during counter increment. Delta == %d"
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,NUM_THREADS * NUM_LOOP - contended);
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}
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};
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/** Register this test class... */
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LAUNCHER (SyncClasslock_test, "unit common");
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}} // namespace lib::test
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