167 lines
4.4 KiB
C
167 lines
4.4 KiB
C
/*
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* pthread_setspecific.c
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*
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* Description:
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* POSIX thread functions which implement thread-specific data (TSD).
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_setspecific (pthread_key_t key, const void *value)
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/*
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* ------------------------------------------------------
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* DOCPUBLIC
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* This function sets the value of the thread specific
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* key in the calling thread.
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*
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* PARAMETERS
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* key
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* an instance of pthread_key_t
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* value
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* the value to set key to
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*
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*
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* DESCRIPTION
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* This function sets the value of the thread specific
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* key in the calling thread.
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*
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* RESULTS
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* 0 successfully set value
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* EAGAIN could not set value
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* ENOENT SERIOUS!!
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*
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* ------------------------------------------------------
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*/
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{
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pthread_t self;
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int result = 0;
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if (key != ptw32_selfThreadKey)
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{
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/*
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* Using pthread_self will implicitly create
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* an instance of pthread_t for the current
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* thread if one wasn't explicitly created
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*/
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self = pthread_self ();
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if (self.p == NULL)
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{
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return ENOENT;
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}
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}
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else
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{
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/*
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* Resolve catch-22 of registering thread with selfThread
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* key
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*/
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ptw32_thread_t * sp = (ptw32_thread_t *) pthread_getspecific (ptw32_selfThreadKey);
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if (sp == NULL)
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{
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if (value == NULL)
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{
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return ENOENT;
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}
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self = *((pthread_t *) value);
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}
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else
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{
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self = sp->ptHandle;
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}
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}
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result = 0;
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if (key != NULL)
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{
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if (self.p != NULL && key->destructor != NULL && value != NULL)
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{
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ptw32_mcs_local_node_t keyLock;
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ptw32_mcs_local_node_t threadLock;
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ptw32_thread_t * sp = (ptw32_thread_t *) self.p;
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/*
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* Only require associations if we have to
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* call user destroy routine.
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* Don't need to locate an existing association
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* when setting data to NULL for WIN32 since the
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* data is stored with the operating system; not
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* on the association; setting assoc to NULL short
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* circuits the search.
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*/
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ThreadKeyAssoc *assoc;
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ptw32_mcs_lock_acquire(&(key->keyLock), &keyLock);
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ptw32_mcs_lock_acquire(&(sp->threadLock), &threadLock);
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assoc = (ThreadKeyAssoc *) sp->keys;
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/*
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* Locate existing association
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*/
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while (assoc != NULL)
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{
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if (assoc->key == key)
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{
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/*
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* Association already exists
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*/
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break;
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}
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assoc = assoc->nextKey;
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}
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/*
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* create an association if not found
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*/
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if (assoc == NULL)
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{
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result = ptw32_tkAssocCreate (sp, key);
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}
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ptw32_mcs_lock_release(&threadLock);
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ptw32_mcs_lock_release(&keyLock);
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}
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if (result == 0)
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{
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if (!TlsSetValue (key->key, (LPVOID) value))
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{
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result = EAGAIN;
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}
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}
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}
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return (result);
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} /* pthread_setspecific */
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