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/*
* pthread_setspecific.c
*
* Description:
* POSIX thread functions which implement thread-specific data (TSD).
*
* --------------------------------------------------------------------------
*
* 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
pthread_setspecific (pthread_key_t key, const void *value)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function sets the value of the thread specific
* key in the calling thread.
*
* PARAMETERS
* key
* an instance of pthread_key_t
* value
* the value to set key to
*
*
* DESCRIPTION
* This function sets the value of the thread specific
* key in the calling thread.
*
* RESULTS
* 0 successfully set value
* EAGAIN could not set value
* ENOENT SERIOUS!!
*
* ------------------------------------------------------
*/
{
pthread_t self;
int result = 0;
if (key != ptw32_selfThreadKey)
{
/*
* Using pthread_self will implicitly create
* an instance of pthread_t for the current
* thread if one wasn't explicitly created
*/
self = pthread_self ();
if (self.p == NULL)
{
return ENOENT;
}
}
else
{
/*
* Resolve catch-22 of registering thread with selfThread
* key
*/
ptw32_thread_t * sp = (ptw32_thread_t *) pthread_getspecific (ptw32_selfThreadKey);
if (sp == NULL)
{
if (value == NULL)
{
return ENOENT;
}
self = *((pthread_t *) value);
}
else
{
self = sp->ptHandle;
}
}
result = 0;
if (key != NULL)
{
if (self.p != NULL && key->destructor != NULL && value != NULL)
{
ptw32_mcs_local_node_t keyLock;
ptw32_mcs_local_node_t threadLock;
ptw32_thread_t * sp = (ptw32_thread_t *) self.p;
/*
* Only require associations if we have to
* call user destroy routine.
* Don't need to locate an existing association
* when setting data to NULL for WIN32 since the
* data is stored with the operating system; not
* on the association; setting assoc to NULL short
* circuits the search.
*/
ThreadKeyAssoc *assoc;
ptw32_mcs_lock_acquire(&(key->keyLock), &keyLock);
ptw32_mcs_lock_acquire(&(sp->threadLock), &threadLock);
assoc = (ThreadKeyAssoc *) sp->keys;
/*
* Locate existing association
*/
while (assoc != NULL)
{
if (assoc->key == key)
{
/*
* Association already exists
*/
break;
}
assoc = assoc->nextKey;
}
/*
* create an association if not found
*/
if (assoc == NULL)
{
result = ptw32_tkAssocCreate (sp, key);
}
ptw32_mcs_lock_release(&threadLock);
ptw32_mcs_lock_release(&keyLock);
}
if (result == 0)
{
if (!TlsSetValue (key->key, (LPVOID) value))
{
result = EAGAIN;
}
}
}
return (result);
} /* pthread_setspecific */
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