1// Licensed to the .NET Foundation under one or more agreements.
2// The .NET Foundation licenses this file to you under the MIT license.
3// See the LICENSE file in the project root for more information.
4
5/*============================================================
6**
7** Source: test.c
8**
9** Purpose: Test for InterlockedCompareExchangePointer() function
10**
11**
12**=========================================================*/
13
14/* This test is FINISHED. Note: The biggest feature of this function is that
15 it locks the value before it increments it -- in order to make it so only
16 one thread can access it. But, I really don't have a great test to
17 make sure it's thread safe. Any ideas?
18*/
19
20#include <palsuite.h>
21
22int __cdecl main(int argc, char *argv[])
23{
24
25 long StartValue = 5;
26 long NewValue = 10;
27 PVOID ReturnValue = NULL;
28
29 /*
30 * Initialize the PAL and return FAILURE if this fails
31 */
32
33 if(0 != (PAL_Initialize(argc, argv)))
34 {
35 return FAIL;
36 }
37
38 ReturnValue = InterlockedCompareExchangePointer((PVOID)&StartValue,
39 (PVOID)NewValue,
40 (PVOID)StartValue);
41
42 /* StartValue and NewValue should be equal now */
43 if(StartValue != NewValue)
44 {
45 Fail("ERROR: These values should be equal after the exchange. "
46 "They should both be %d, however the value that should have "
47 "been exchanged is %d.\n",NewValue,StartValue);
48 }
49
50 /* Returnvalue should have been set to what 'StartValue' was
51 (5 in this case)
52 */
53
54 if((int)(size_t)ReturnValue != 5)
55 {
56 Fail("ERROR: The return value should be the value of the "
57 "variable before the exchange took place, which was 5. "
58 "But, the return value was %d.\n",ReturnValue);
59 }
60
61 /* This is a mismatch, so no exchange should happen */
62 InterlockedCompareExchangePointer((PVOID)&StartValue,
63 ReturnValue,
64 ReturnValue);
65 if(StartValue != NewValue)
66 {
67 Fail("ERROR: The compare should have failed and no exchange should "
68 "have been made, but it seems the exchange still happened.\n");
69 }
70
71
72 PAL_Terminate();
73 return PASS;
74}
75
76
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81