ptw32_calluserdestroyroutines.c

电驴下载工具eMule0.47aVeryCD的源代码,可作分析测试也可用于P2P软件的开发研究.

/*
 * ptw32_callUserDestroyRoutines.c
 *
 * Description:
 * This translation unit implements routines which are private to
 * the implementation and may be used throughout it.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2004 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"

#ifdef __cplusplus
# if ! defined (_MSC_VER) && ! (defined(__GNUC__) && __GNUC__ < 3) && ! defined(__WATCOMC__)
using
  std::terminate;
# endif
#endif

void
ptw32_callUserDestroyRoutines (pthread_t thread)
     /*
      * -------------------------------------------------------------------
      * DOCPRIVATE
      *
      * This the routine runs through all thread keys and calls
      * the destroy routines on the user's data for the current thread.
      * It simulates the behaviour of POSIX Threads.
      *
      * PARAMETERS
      *              thread
      *                      an instance of pthread_t
      *
      * RETURNS
      *              N/A
      * -------------------------------------------------------------------
      */
{
  ThreadKeyAssoc **
    nextP;
  ThreadKeyAssoc *
    assoc;

  if (thread.p != NULL)
    {
      /*
       * Run through all Thread<-->Key associations
       * for the current thread.
       * If the pthread_key_t still exits (ie the assoc->key
       * is not NULL) then call the user's TSD destroy routine.
       * Notes:
       *      If assoc->key is NULL, then the user previously called
       *      PThreadKeyDestroy. The association is now only referenced
       *      by the current thread and must be released; otherwise
       *      the assoc will be destroyed when the key is destroyed.
       */
      nextP = (ThreadKeyAssoc **) &((ptw32_thread_t *)thread.p)->keys;
      assoc = *nextP;

      while (assoc != NULL)
	{

	  if (pthread_mutex_lock (&(assoc->lock)) == 0)
	    {
	      pthread_key_t k;
	      pthread_t nil = {NULL, 0};

	      if ((k = assoc->key) != NULL)
		{
		  /*
		   * Key still active; pthread_key_delete
		   * will block on this same mutex before
		   * it can release actual key; therefore,
		   * key is valid and we can call the destroy
		   * routine;
		   */
		  void * value = NULL;

		  value = pthread_getspecific (k);
		  if (value != NULL && k->destructor != NULL)
		    {

#ifdef __cplusplus

		      try
		      {
			/*
			 * Run the caller's cleanup routine.
			 */
			(*(k->destructor)) (value);
		      }
		      catch (...)
		      {
			/*
			 * A system unexpected exception has occurred
			 * running the user's destructor.
			 * We get control back within this block in case
			 * the application has set up it's own terminate
			 * handler. Since we are leaving the thread we
			 * should not get any internal pthreads
			 * exceptions.
			 */
			terminate ();
		      }

#else /* __cplusplus */

		      /*
		       * Run the caller's cleanup routine.
		       */
		      (*(k->destructor)) (value);

#endif /* __cplusplus */
		    }
		}

	      /*
	       * mark assoc->thread as NULL to indicate the
	       * thread no longer references this association
	       */
	      assoc->thread = nil;

	      /*
	       * Remove association from the pthread_t chain
	       */
	      *nextP = assoc->nextKey;

	      pthread_mutex_unlock (&(assoc->lock));

	      ptw32_tkAssocDestroy (assoc);

	      assoc = *nextP;
	    }
	}
    }

}				/* ptw32_callUserDestroyRoutines */