xref: /haiku/src/tests/kits/support/blocker/DestructionTest2.cpp (revision 9285de5124a336ecd9ab26aea1acb7c79aa2f02c)

/*
	$Id: DestructionTest2.cpp,v 1.2 2002/07/18 05:32:00 tylerdauwalder Exp $

	This file implements a test class for testing BLocker functionality.
	It tests use cases "Destruction" and "Locking 4".

	The test works like the following:
		- the main thread acquires the lock
		- it creates a new thread and sleeps
		- the new thread attempts to acquire the lock but times out
		- the new thread then attempts to acquire the lock again
		- before the new thread times out a second time, the first thread releases
		  the lock
		- at this time, the new thread acquires the lock and goes to sleep
		- the first thread attempts to acquire the lock
		- the second thread deletes the lock
		- the first thread is woken up indicating that the lock wasn't acquired.

	*/


#include <ThreadedTestCaller.h>
#include "DestructionTest2.h"
#include <cppunit/TestSuite.h>
#include <Locker.h>

// This constant is used to determine the number of microseconds to
// sleep during major steps of the test.

const bigtime_t SNOOZE_TIME = 200000;


/*
 *  Method:  DestructionTest2::DestructionTest2()
 *   Descr:  This is the only constructor for this test class.
 */


	DestructionTest2::DestructionTest2(std::string name,
											   bool isBenaphore) :
		LockerTestCase(name, isBenaphore)
{
	}


/*
 *  Method:  DestructionTest2::~DestructionTest2()
 *   Descr:  This is the only destructor for this test class.
 */


	DestructionTest2::~DestructionTest2()
{
	}


/*
 *  Method:  DestructionTest2::TestThread1()
 *   Descr:  This method immediately acquires the lock, sleeps
 *           for SNOOZE_TIME and then releases the lock.  It sleeps
 *           again for SNOOZE_TIME and then tries to re-acquire the
 *           lock.  By this time, the other thread should have
 *           deleted the lock.  This acquisition should fail.
 */

void DestructionTest2::TestThread1(void)
{
	assert(theLocker->LockWithTimeout(SNOOZE_TIME) == B_OK);
	NextSubTest();
	snooze(SNOOZE_TIME);
	NextSubTest();
	theLocker->Unlock();
	NextSubTest();
	snooze(SNOOZE_TIME);
	NextSubTest();
	assert(theLocker->LockWithTimeout(SNOOZE_TIME * 10) == B_BAD_SEM_ID);
	NextSubTest();
}


/*
 *  Method:  DestructionTest2::TestThread2()
 *   Descr:  This method sleeps for SNOOZE_TIME/10 and then attempts to acquire
 *           the lock for SNOOZE_TIME/10 seconds.  This acquisition will timeout
 *           because the other thread is holding the lock.  Then it acquires the
 *           lock by using a larger timeout. It sleeps again for 2*SNOOZE_TIME and
 *           then deletes the lock.  This should wake up the other thread.
 */

void DestructionTest2::TestThread2(void)
{
	BLocker *tmpLock;

	snooze(SNOOZE_TIME/10);
	NextSubTest();
	assert(theLocker->LockWithTimeout(SNOOZE_TIME / 10) == B_TIMED_OUT);
	NextSubTest();
	assert(theLocker->LockWithTimeout(SNOOZE_TIME * 10) == B_OK);
	NextSubTest();
	snooze(SNOOZE_TIME);
	NextSubTest();
	snooze(SNOOZE_TIME);
	NextSubTest();
	tmpLock = theLocker;
	theLocker = NULL;
	delete tmpLock;
}


/*
 *  Method:  DestructionTest2::suite()
 *   Descr:  This static member function returns a test suite for performing
 *           all combinations of "DestructionTest2".  The test suite contains
 *           two instances of the test.  One is performed on a benaphore,
 *           the other on a semaphore based BLocker.  Each individual test
 *           is created as a ThreadedTestCase (typedef'd as
 *           DestructionTest2Caller) with two independent threads.
 */

CppUnit::Test *DestructionTest2::suite(void)
{
	typedef BThreadedTestCaller<DestructionTest2> DestructionTest2Caller;
	CppUnit::TestSuite *testSuite = new CppUnit::TestSuite("DestructionTest2");

	// Make a benaphore based test object, create a ThreadedTestCase for it and add
	// two threads to it.
	DestructionTest2 *theTest = new DestructionTest2("Benaphore", true);
	DestructionTest2Caller *threadedTest1 = new DestructionTest2Caller("BLocker::Destruction Test #2 (benaphore)", theTest);
	threadedTest1->addThread("A", &DestructionTest2::TestThread1);
	threadedTest1->addThread("B", &DestructionTest2::TestThread2);

	// Make a semaphore based test object, create a ThreadedTestCase for it and add
	// three threads to it.
	theTest = new DestructionTest2("Semaphore", false);
	DestructionTest2Caller *threadedTest2 = new DestructionTest2Caller("BLocker::Destruction Test #2 (semaphore)", theTest);
	threadedTest2->addThread("A", &DestructionTest2::TestThread1);
	threadedTest2->addThread("B", &DestructionTest2::TestThread2);

	testSuite->addTest(threadedTest1);
	testSuite->addTest(threadedTest2);
	return(testSuite);
}