pthread_win32_attach_detach_np.c

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/*
 * pthread_win32_attach_detach_np.c
 *
 * Description:
 * This translation unit implements non-portable thread functions.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2003 Pthreads-win32 contributors
 * 
 *      Contact Email: [e-mail]
 * 
 *      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
 */

#include "pthread.h"
#include "implement.h"

/*
 * Handle to kernel32.dll 
 */
static HINSTANCE ptw32_h_kernel32;

BOOL
pthread_win32_process_attach_np ()
{
  BOOL result = TRUE;

  result = ptw32_processInitialize ();
#ifdef _UWIN
  pthread_count++;
#endif

#ifndef TEST_ICE

  /*
   * Load KERNEL32 and try to get address of InterlockedCompareExchange
   */
  ptw32_h_kernel32 = LoadLibrary(TEXT("KERNEL32.DLL"));

  ptw32_interlocked_compare_exchange =
    (PTW32_INTERLOCKED_LONG (WINAPI *)(PTW32_INTERLOCKED_LPLONG, PTW32_INTERLOCKED_LONG, PTW32_INTERLOCKED_LONG))
#if defined(NEED_UNICODE_CONSTS)
    GetProcAddress(ptw32_h_kernel32,
                   (const TCHAR *)TEXT("InterlockedCompareExchange"));
#else
    GetProcAddress(ptw32_h_kernel32,
                   (LPCSTR) "InterlockedCompareExchange");
#endif

  if (ptw32_interlocked_compare_exchange == NULL)
    {
      ptw32_interlocked_compare_exchange = ptw32_InterlockedCompareExchange;

      /*
       * If InterlockedCompareExchange is not being used, then free
       * the kernel32.dll handle now, rather than leaving it until
       * DLL_PROCESS_DETACH.
       *
       * Note: this is not a pedantic exercise in freeing unused
       * resources!  It is a work-around for a bug in Windows 95
       * (see microsoft knowledge base article, Q187684) which
       * does Bad Things when FreeLibrary is called within
       * the DLL_PROCESS_DETACH code, in certain situations.
       * Since w95 just happens to be a platform which does not
       * provide InterlockedCompareExchange, the bug will be
       * effortlessly avoided.
       */
      (void) FreeLibrary(ptw32_h_kernel32);
      ptw32_h_kernel32 = 0;
    }

#else /* TEST_ICE */

  ptw32_interlocked_compare_exchange = ptw32_InterlockedCompareExchange;

#endif /* TEST_ICE */

  return result;
}


BOOL
pthread_win32_process_detach_np ()
{
  if (ptw32_processInitialized)
    {
      pthread_t self = (pthread_t) pthread_getspecific (ptw32_selfThreadKey);

      /*
       * Detached threads have their resources automatically
       * cleaned up upon exit (others must be 'joined').
       */
      if (self != NULL &&
          self->detachState == PTHREAD_CREATE_DETACHED)
        {
          ptw32_threadDestroy (self);
	  TlsSetValue (ptw32_selfThreadKey->key, NULL);
        }

      /*
       * The DLL is being unmapped from the process's address space
       */
      ptw32_processTerminate ();

      if (ptw32_h_kernel32)
        {
           (void) FreeLibrary(ptw32_h_kernel32);
        }
    }

  return TRUE;
}

BOOL
pthread_win32_thread_attach_np ()
{
  return TRUE;
}

BOOL
pthread_win32_thread_detach_np ()
{
  if (ptw32_processInitialized)
    {
      /*
       * Don't use pthread_self() to avoid creating an implicit POSIX thread handle
       * unnecessarily.
       */
       pthread_t self = (pthread_t) pthread_getspecific (ptw32_selfThreadKey);

       /*
        * Detached threads have their resources automatically
        * cleaned up upon exit (others must be 'joined').
        */
       if (self != NULL &&
           self->detachState == PTHREAD_CREATE_DETACHED)
         {
           ptw32_threadDestroy (self);
	   TlsSetValue (ptw32_selfThreadKey->key, NULL);
         }
    }

  return TRUE;
}