ptw32_tkassoccreate.c

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/*
 * ptw32_tkAssocCreate.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) 1999,2003 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"


int
ptw32_tkAssocCreate (ThreadKeyAssoc ** assocP,
			pthread_t thread,
			pthread_key_t key)
     /*
      * -------------------------------------------------------------------
      * This routine creates an association that
      * is unique for the given (thread,key) combination.The association 
      * is referenced by both the thread and the key.
      * This association allows us to determine what keys the
      * current thread references and what threads a given key
      * references.
      * See the detailed description
      * at the beginning of this file for further details.
      *
      * Notes:
      *      1)      New associations are pushed to the beginning of the
      * 	     chain so that the internal ptw32_selfThreadKey association
      * 	     is always last, thus allowing selfThreadExit to
      * 	     be implicitly called by pthread_exit last.
      *
      * Parameters:
      * 	     assocP
      * 		     address into which the association is returned.
      * 	     thread
      * 		     current running thread. If NULL, then association
      * 		     is only added to the key. A NULL thread indicates
      * 		     that the user called pthread_setspecific prior
      * 		     to starting a thread. That's ok.
      * 	     key
      * 		     key on which to create an association.
      * Returns:
      *       0 	     - if successful,
      *       ENOMEM	     - not enough memory to create assoc or other object
      *       EINVAL	     - an internal error occurred
      *       ENOSYS	     - an internal error occurred
      * -------------------------------------------------------------------
      */
{
  int result;
  ThreadKeyAssoc *assoc;

  /*
   * Have to create an association and add it
   * to both the key and the thread.
   */
  assoc = (ThreadKeyAssoc *) calloc (1, sizeof (*assoc));

  if (assoc == NULL)
    {
      result = ENOMEM;
      goto FAIL0;
    }

  /*
   * Initialise only when used for the first time.
   */
  assoc->lock = PTHREAD_MUTEX_INITIALIZER;
  assoc->thread = thread;
  assoc->key = key;

  /*
   * Register assoc with key
   */
  if ((result = pthread_mutex_lock (&(key->threadsLock))) != 0)
    {
      goto FAIL2;
    }

  assoc->nextThread = (ThreadKeyAssoc *) key->threads;
  key->threads = (void *) assoc;

  pthread_mutex_unlock (&(key->threadsLock));

  if (thread != NULL)
    {
      /*
       * Register assoc with thread
       */
      assoc->nextKey = (ThreadKeyAssoc *) thread->keys;
      thread->keys = (void *) assoc;
    }

  *assocP = assoc;

  return (result);

  /*
   * -------------
   * Failure Code
   * -------------
   */
FAIL2:
  pthread_mutex_destroy (&(assoc->lock));
  free (assoc);

FAIL0:

  return (result);

}				/* ptw32_tkAssocCreate */