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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*============================================================
**
** Source: test.c
**
** Purpose: Test for InterlockedCompareExchangePointer() function
**
**
**=========================================================*/
/* This test is FINISHED. Note: The biggest feature of this function is that
it locks the value before it increments it -- in order to make it so only
one thread can access it. But, I really don't have a great test to
make sure it's thread safe. Any ideas?
*/
#include <palsuite.h>
int __cdecl main(int argc, char *argv[])
{
long StartValue = 5;
long NewValue = 10;
PVOID ReturnValue = NULL;
/*
* Initialize the PAL and return FAILURE if this fails
*/
if(0 != (PAL_Initialize(argc, argv)))
{
return FAIL;
}
ReturnValue = InterlockedCompareExchangePointer((PVOID)&StartValue,
(PVOID)NewValue,
(PVOID)StartValue);
/* StartValue and NewValue should be equal now */
if(StartValue != NewValue)
{
Fail("ERROR: These values should be equal after the exchange. "
"They should both be %d, however the value that should have "
"been exchanged is %d.\n",NewValue,StartValue);
}
/* Returnvalue should have been set to what 'StartValue' was
(5 in this case)
*/
if((int)(size_t)ReturnValue != 5)
{
Fail("ERROR: The return value should be the value of the "
"variable before the exchange took place, which was 5. "
"But, the return value was %d.\n",ReturnValue);
}
/* This is a mismatch, so no exchange should happen */
InterlockedCompareExchangePointer((PVOID)&StartValue,
ReturnValue,
ReturnValue);
if(StartValue != NewValue)
{
Fail("ERROR: The compare should have failed and no exchange should "
"have been made, but it seems the exchange still happened.\n");
}
PAL_Terminate();
return PASS;
}
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