rwlocktest.cpp

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//
// RWLockTest.cpp
//
// $Id: //poco/Main/Foundation/testsuite/src/RWLockTest.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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//


#include "RWLockTest.h"
#include "CppUnit/TestCaller.h"
#include "CppUnit/TestSuite.h"
#include "Foundation/RWLock.h"
#include "Foundation/Thread.h"
#include "Foundation/Runnable.h"


using Foundation::RWLock;
using Foundation::Thread;
using Foundation::Runnable;


class RWLockRunnable: public Runnable
{
public:
	RWLockRunnable(RWLock& lock, volatile int& counter): _lock(lock), _counter(counter), _ok(true)
	{
	}
	
	void run()
	{
		int lastCount = 0;
		for (int i = 0; i < 10000; ++i)
		{
			_lock.readLock();
			lastCount = _counter;
			for (int k = 0; k < 100; ++k)
			{
				if (_counter != lastCount) _ok = false;
			}
			_lock.unlock();
			_lock.writeLock();
			for (int k = 0; k < 100; ++k)
				--_counter;
			for (int k = 0; k < 100; ++k)
				++_counter;
			++_counter;
			if (_counter <= lastCount) _ok = false;
			_lock.unlock();
		}
	}
	
	bool ok() const
	{
		return _ok;
	}
	
private:
	RWLock& _lock;
	volatile int& _counter;
	bool _ok;
};


class RWTryLockRunnable: public Runnable
{
public:
	RWTryLockRunnable(RWLock& lock, volatile int& counter): _lock(lock), _counter(counter), _ok(true)
	{
	}
	
	void run()
	{
		int lastCount = 0;
		for (int i = 0; i < 10000; ++i)
		{
			while (!_lock.tryReadLock()) Thread::yield();
			lastCount = _counter;
			for (int k = 0; k < 100; ++k)
			{
				if (_counter != lastCount) _ok = false;
			}
			_lock.unlock();
			while (!_lock.tryWriteLock()) Thread::yield();
			for (int k = 0; k < 100; ++k)
				--_counter;
			for (int k = 0; k < 100; ++k)
				++_counter;
			++_counter;
			if (_counter <= lastCount) _ok = false;
			_lock.unlock();
		}
	}
	
	bool ok() const
	{
		return _ok;
	}
	
private:
	RWLock& _lock;
	volatile int& _counter;
	bool _ok;
};


RWLockTest::RWLockTest(const std::string& name): CppUnit::TestCase(name)
{
}


RWLockTest::~RWLockTest()
{
}


void RWLockTest::testLock()
{
	RWLock lock;
	int counter = 0;
	RWLockRunnable r1(lock, counter);
	RWLockRunnable r2(lock, counter);
	RWLockRunnable r3(lock, counter);
	RWLockRunnable r4(lock, counter);
	RWLockRunnable r5(lock, counter);
	Thread t1;
	Thread t2;
	Thread t3;
	Thread t4;
	Thread t5;
	t1.start(r1);
	t2.start(r2);
	t3.start(r3);
	t4.start(r4);
	t5.start(r5);
	t1.join();
	t2.join();
	t3.join();
	t4.join();
	t5.join();
	assert (counter == 50000);
	assert (r1.ok());
	assert (r2.ok());
	assert (r3.ok());
	assert (r4.ok());
	assert (r5.ok());
}


void RWLockTest::testTryLock()
{
	RWLock lock;
	int counter = 0;
	RWTryLockRunnable r1(lock, counter);
	RWTryLockRunnable r2(lock, counter);
	RWTryLockRunnable r3(lock, counter);
	RWTryLockRunnable r4(lock, counter);
	RWTryLockRunnable r5(lock, counter);
	Thread t1;
	Thread t2;
	Thread t3;
	Thread t4;
	Thread t5;
	t1.start(r1);
	t2.start(r2);
	t3.start(r3);
	t4.start(r4);
	t5.start(r5);
	t1.join();
	t2.join();
	t3.join();
	t4.join();
	t5.join();
	assert (counter == 50000);
	assert (r1.ok());
	assert (r2.ok());
	assert (r3.ok());
	assert (r4.ok());
	assert (r5.ok());
}


void RWLockTest::setUp()
{
}


void RWLockTest::tearDown()
{
}


CppUnit::Test* RWLockTest::suite()
{
	CppUnit::TestSuite* pSuite = new CppUnit::TestSuite("RWLockTest");

	CppUnit_addTest(pSuite, RWLockTest, testLock);
	CppUnit_addTest(pSuite, RWLockTest, testTryLock);

	return pSuite;
}