/* * tryentercs.c * * * -------------------------------------------------------------------------- * *      Pthreads-win32 - POSIX Threads Library for Win32 *      Copyright(C) 1998 John E. Bossom *      Copyright(C) 1999,2005 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;intmain(){  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);}