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|
/*
* tryentercs.c
*
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2003 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* --------------------------------------------------------------------------
*
* See if we have the TryEnterCriticalSection function.
* Does not use any part of pthreads.
*/
#include <windows.h>
#include <process.h>
#include <stdio.h>
/*
* Function pointer to TryEnterCriticalSection if it exists
* - otherwise NULL
*/
BOOL (WINAPI *_try_enter_critical_section)(LPCRITICAL_SECTION) =
NULL;
/*
* Handle to kernel32.dll
*/
static HINSTANCE _h_kernel32;
int
main()
{
CRITICAL_SECTION cs;
SetLastError(0);
printf("Last Error [main enter] %ld\n", (long) GetLastError());
/*
* Load KERNEL32 and try to get address of TryEnterCriticalSection
*/
_h_kernel32 = LoadLibrary(TEXT("KERNEL32.DLL"));
_try_enter_critical_section =
(BOOL (PT_STDCALL *)(LPCRITICAL_SECTION))
GetProcAddress(_h_kernel32,
(LPCSTR) "TryEnterCriticalSection");
if (_try_enter_critical_section != NULL)
{
InitializeCriticalSection(&cs);
SetLastError(0);
if ((*_try_enter_critical_section)(&cs) != 0)
{
LeaveCriticalSection(&cs);
}
else
{
printf("Last Error [try enter] %ld\n", (long) GetLastError());
_try_enter_critical_section = NULL;
}
DeleteCriticalSection(&cs);
}
(void) FreeLibrary(_h_kernel32);
printf("This system %s TryEnterCriticalSection.\n",
(_try_enter_critical_section == NULL) ? "DOES NOT SUPPORT" : "SUPPORTS");
printf("POSIX Mutexes will be based on Win32 %s.\n",
(_try_enter_critical_section == NULL) ? "Mutexes" : "Critical Sections");
return(0);
}
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