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pthread_setspecific.c    168 lines (154 with data), 4.5 kB

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/*
* pthread_setspecific.c
*
* Description:
* POSIX thread functions which implement thread-specific data (TSD).
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 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
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 */