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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: 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
*/
#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 */
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