104 lines
3 KiB
C
104 lines
3 KiB
C
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/*
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* tryentercs.c
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*
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*
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* --------------------------------------------------------------------------
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*
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* See if we have the TryEnterCriticalSection function.
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* Does not use any part of pthreads.
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*/
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#include <windows.h>
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#include <process.h>
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#include <stdio.h>
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/*
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* Function pointer to TryEnterCriticalSection if it exists
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* - otherwise NULL
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*/
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BOOL (WINAPI *_try_enter_critical_section)(LPCRITICAL_SECTION) =
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NULL;
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/*
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* Handle to kernel32.dll
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*/
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static HINSTANCE _h_kernel32;
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int
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main()
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{
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CRITICAL_SECTION cs;
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SetLastError(0);
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printf("Last Error [main enter] %ld\n", (long) GetLastError());
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/*
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* Load KERNEL32 and try to get address of TryEnterCriticalSection
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*/
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_h_kernel32 = LoadLibrary(TEXT("KERNEL32.DLL"));
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_try_enter_critical_section =
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(BOOL (PT_STDCALL *)(LPCRITICAL_SECTION))
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GetProcAddress(_h_kernel32,
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(LPCSTR) "TryEnterCriticalSection");
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if (_try_enter_critical_section != NULL)
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{
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InitializeCriticalSection(&cs);
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SetLastError(0);
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if ((*_try_enter_critical_section)(&cs) != 0)
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{
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LeaveCriticalSection(&cs);
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}
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else
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{
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printf("Last Error [try enter] %ld\n", (long) GetLastError());
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_try_enter_critical_section = NULL;
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}
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DeleteCriticalSection(&cs);
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}
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(void) FreeLibrary(_h_kernel32);
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printf("This system %s TryEnterCriticalSection.\n",
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(_try_enter_critical_section == NULL) ? "DOES NOT SUPPORT" : "SUPPORTS");
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printf("POSIX Mutexes will be based on Win32 %s.\n",
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(_try_enter_critical_section == NULL) ? "Mutexes" : "Critical Sections");
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return(0);
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}
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