109 lines
3.8 KiB
C
109 lines
3.8 KiB
C
/*
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* pthread_key_create.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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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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/* TLS_OUT_OF_INDEXES not defined on WinCE */
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#if !defined(TLS_OUT_OF_INDEXES)
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#define TLS_OUT_OF_INDEXES 0xffffffff
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#endif
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int
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pthread_key_create (pthread_key_t * key, void (PTW32_CDECL *destructor) (void *))
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/*
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* ------------------------------------------------------
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* DOCPUBLIC
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* This function creates a thread-specific data key visible
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* to all threads. All existing and new threads have a value
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* NULL for key until set using pthread_setspecific. When any
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* thread with a non-NULL value for key terminates, 'destructor'
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* is called with key's current value for that thread.
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*
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* PARAMETERS
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* key
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* pointer to an instance of pthread_key_t
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*
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*
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* DESCRIPTION
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* This function creates a thread-specific data key visible
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* to all threads. All existing and new threads have a value
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* NULL for key until set using pthread_setspecific. When any
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* thread with a non-NULL value for key terminates, 'destructor'
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* is called with key's current value for that thread.
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*
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* RESULTS
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* 0 successfully created semaphore,
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* EAGAIN insufficient resources or PTHREAD_KEYS_MAX
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* exceeded,
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* ENOMEM insufficient memory to create the key,
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*
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* ------------------------------------------------------
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*/
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{
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int result = 0;
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pthread_key_t newkey;
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if ((newkey = (pthread_key_t) calloc (1, sizeof (*newkey))) == NULL)
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{
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result = ENOMEM;
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}
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else if ((newkey->key = TlsAlloc ()) == TLS_OUT_OF_INDEXES)
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{
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result = EAGAIN;
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free (newkey);
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newkey = NULL;
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}
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else if (destructor != NULL)
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{
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/*
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* Have to manage associations between thread and key;
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* Therefore, need a lock that allows competing threads
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* to gain exclusive access to the key->threads list.
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*
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* The mutex will only be created when it is first locked.
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*/
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newkey->keyLock = 0;
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newkey->destructor = destructor;
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}
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*key = newkey;
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return (result);
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}
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