1 /*
2 * tryentercs.c
3 *
4 *
5 * --------------------------------------------------------------------------
6 *
7 * Pthreads-win32 - POSIX Threads Library for Win32
8 * Copyright(C) 1998 John E. Bossom
9 * Copyright(C) 1999,2005 Pthreads-win32 contributors
10 *
11 * Contact Email: rpj@callisto.canberra.edu.au
12 *
13 * The current list of contributors is contained
14 * in the file CONTRIBUTORS included with the source
15 * code distribution. The list can also be seen at the
16 * following World Wide Web location:
17 * http://sources.redhat.com/pthreads-win32/contributors.html
18 *
19 * This library is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU Lesser General Public
21 * License as published by the Free Software Foundation; either
22 * version 2 of the License, or (at your option) any later version.
23 *
24 * This library is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
27 * Lesser General Public License for more details.
28 *
29 * You should have received a copy of the GNU Lesser General Public
30 * License along with this library in the file COPYING.LIB;
31 * if not, write to the Free Software Foundation, Inc.,
32 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
33 *
34 * --------------------------------------------------------------------------
35 *
36 * See if we have the TryEnterCriticalSection function.
37 * Does not use any part of pthreads.
38 */
39
40 #include <windows.h>
41 #include <process.h>
42 #include <stdio.h>
43
44 /*
45 * Function pointer to TryEnterCriticalSection if it exists
46 * - otherwise NULL
47 */
48 BOOL (WINAPI *_try_enter_critical_section)(LPCRITICAL_SECTION) =
49 NULL;
50
51 /*
52 * Handle to kernel32.dll
53 */
54 static HINSTANCE _h_kernel32;
55
56
57 int
main()58 main()
59 {
60 CRITICAL_SECTION cs;
61
62 SetLastError(0);
63
64 printf("Last Error [main enter] %ld\n", (long) GetLastError());
65
66 /*
67 * Load KERNEL32 and try to get address of TryEnterCriticalSection
68 */
69 _h_kernel32 = LoadLibrary(TEXT("KERNEL32.DLL"));
70 _try_enter_critical_section =
71 (BOOL (WINAPI *)(LPCRITICAL_SECTION))
72 GetProcAddress(_h_kernel32,
73 (LPCSTR) "TryEnterCriticalSection");
74
75 if (_try_enter_critical_section != NULL)
76 {
77 InitializeCriticalSection(&cs);
78
79 SetLastError(0);
80
81 if ((*_try_enter_critical_section)(&cs) != 0)
82 {
83 LeaveCriticalSection(&cs);
84 }
85 else
86 {
87 printf("Last Error [try enter] %ld\n", (long) GetLastError());
88
89 _try_enter_critical_section = NULL;
90 }
91 DeleteCriticalSection(&cs);
92 }
93
94 (void) FreeLibrary(_h_kernel32);
95
96 printf("This system %s TryEnterCriticalSection.\n",
97 (_try_enter_critical_section == NULL) ? "DOES NOT SUPPORT" : "SUPPORTS");
98 printf("POSIX Mutexes will be based on Win32 %s.\n",
99 (_try_enter_critical_section == NULL) ? "Mutexes" : "Critical Sections");
100
101 return(0);
102 }
103
104