// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// e32test\bench\t_ctxsw3.cpp

// Overview:

// Benchmark the inter-thread context switching. 

// API Information:

// RThread, RRSemaphore.

// Details:

// - Create a semaphore.

// - Create a thread (thread1) with a handle to the Semaphore and 

// priority EPriorityLess. Verify the successful creation.

// - Create another thread (thread2) with a handle to the Semaphore 

// and priority EPriorityMuchLess. Verify the successful creation.

// - thread1 counts the number of times the semaphore count is decremented.

// - thread2 counts the number of times the semaphore count is incremented.

// - Display the number of times the semaphore is signalled per second.

// Platforms/Drives/Compatibility:

// All.

// Assumptions/Requirement/Pre-requisites:

// Failures and causes:

// Base Port information:

// 

//

#include <e32test.h>

RTest test(_L("T_CTXSW3"));

LOCAL_D TInt Count;

LOCAL_D RSemaphore StartSem;

LOCAL_C TInt Thread1(TAny* aSemaphore)

	{

	RSemaphore s;

	s.SetHandle((TInt)aSemaphore);

	StartSem.Wait();

	FOREVER

		{

		s.Wait();

		Count++;

		}

	}

LOCAL_C TInt Thread2(TAny* aSemaphore)

	{

	RSemaphore s;

	s.SetHandle((TInt)aSemaphore);

	StartSem.Wait();

	FOREVER

		{

		s.Signal();

		Count++;

		}

	}

const TInt KHeapSize=4096;

GLDEF_C TInt E32Main()

	{

	test.Title();

	test.Start(_L("Timing inter-thread context switches..."));

	TInt r=StartSem.CreateLocal(0);

	test(r==KErrNone);

	RSemaphore sem;

	r=sem.CreateLocal(0);

	test(r==KErrNone);

	RThread t1,t2;

	r=t1.Create(_L("Thread1"),Thread1,KDefaultStackSize,KHeapSize,KHeapSize,(TAny*)sem.Handle());

	test(r==KErrNone);

	t1.SetPriority(EPriorityLess);

	r=t2.Create(_L("Thread2"),Thread2,KDefaultStackSize,KHeapSize,KHeapSize,(TAny*)sem.Handle());

	test(r==KErrNone);

	t2.SetPriority(EPriorityMuchLess);

	TRequestStatus s1,s2;

	t1.Logon(s1);

	t2.Logon(s2);

	t1.Resume();

	t2.Resume();

	Count=0;

	User::After(20000);

	StartSem.Signal(2);

	User::After(2000000);

	TInt count=Count;

	t2.Kill(0);

	User::WaitForRequest(s2);

	t1.Kill(0);

	User::WaitForRequest(s1);

	t2.Close();

	t1.Close();

	sem.Close();

	test.Printf(_L("%d per second\n"),count/2);

	test.End();

	return 0;

	}