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/*
* tryentercs.c
*
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright (C) 1998 Ben Elliston and Ross Johnson
* Copyright (C) 1999,2000,2001 Ross Johnson
*
* Contact Email: rpj@ise.canberra.edu.au
*
* 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 2.1 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; 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()
{
LPCRITICAL_SECTION lpcs = NULL;
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)
{
SetLastError(0);
(*_try_enter_critical_section)(lpcs);
printf("Last Error [try enter] %ld\n", (long) GetLastError());
}
(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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