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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.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* 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:
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
int
ptw32_tkAssocCreate (ptw32_thread_t * sp, 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 last by pthread_exit.
* 2)
*
* Parameters:
* thread
* current running thread.
* 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
* -------------------------------------------------------------------
*/
{
ThreadKeyAssoc *assoc;
/*
* Have to create an association and add it
* to both the key and the thread.
*
* Both key->keyLock and thread->threadLock are locked before
* entry to this routine.
*/
assoc = (ThreadKeyAssoc *) calloc (1, sizeof (*assoc));
if (assoc == NULL)
{
return ENOMEM;
}
assoc->thread = sp;
assoc->key = key;
/*
* Register assoc with key
*/
assoc->prevThread = NULL;
assoc->nextThread = (ThreadKeyAssoc *) key->threads;
if (assoc->nextThread != NULL)
{
assoc->nextThread->prevThread = assoc;
}
key->threads = (void *) assoc;
/*
* Register assoc with thread
*/
assoc->prevKey = NULL;
assoc->nextKey = (ThreadKeyAssoc *) sp->keys;
if (assoc->nextKey != NULL)
{
assoc->nextKey->prevKey = assoc;
}
sp->keys = (void *) assoc;
return (0);
} /* ptw32_tkAssocCreate */
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