109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
|
/*
|
||
|
|
* pthread_key_create.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.,
|
||
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "pthread.h"
|
||
|
|
#include "implement.h"
|
||
|
|
|
||
|
|
|
||
|
|
/* TLS_OUT_OF_INDEXES not defined on WinCE */
|
||
|
|
#if !defined(TLS_OUT_OF_INDEXES)
|
||
|
|
#define TLS_OUT_OF_INDEXES 0xffffffff
|
||
|
|
#endif
|
||
|
|
|
||
|
|
int
|
||
|
|
pthread_key_create (pthread_key_t * key, void (PTW32_CDECL *destructor) (void *))
|
||
|
|
/*
|
||
|
|
* ------------------------------------------------------
|
||
|
|
* DOCPUBLIC
|
||
|
|
* This function creates a thread-specific data key visible
|
||
|
|
* to all threads. All existing and new threads have a value
|
||
|
|
* NULL for key until set using pthread_setspecific. When any
|
||
|
|
* thread with a non-NULL value for key terminates, 'destructor'
|
||
|
|
* is called with key's current value for that thread.
|
||
|
|
*
|
||
|
|
* PARAMETERS
|
||
|
|
* key
|
||
|
|
* pointer to an instance of pthread_key_t
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* DESCRIPTION
|
||
|
|
* This function creates a thread-specific data key visible
|
||
|
|
* to all threads. All existing and new threads have a value
|
||
|
|
* NULL for key until set using pthread_setspecific. When any
|
||
|
|
* thread with a non-NULL value for key terminates, 'destructor'
|
||
|
|
* is called with key's current value for that thread.
|
||
|
|
*
|
||
|
|
* RESULTS
|
||
|
|
* 0 successfully created semaphore,
|
||
|
|
* EAGAIN insufficient resources or PTHREAD_KEYS_MAX
|
||
|
|
* exceeded,
|
||
|
|
* ENOMEM insufficient memory to create the key,
|
||
|
|
*
|
||
|
|
* ------------------------------------------------------
|
||
|
|
*/
|
||
|
|
{
|
||
|
|
int result = 0;
|
||
|
|
pthread_key_t newkey;
|
||
|
|
|
||
|
|
if ((newkey = (pthread_key_t) calloc (1, sizeof (*newkey))) == NULL)
|
||
|
|
{
|
||
|
|
result = ENOMEM;
|
||
|
|
}
|
||
|
|
else if ((newkey->key = TlsAlloc ()) == TLS_OUT_OF_INDEXES)
|
||
|
|
{
|
||
|
|
result = EAGAIN;
|
||
|
|
|
||
|
|
free (newkey);
|
||
|
|
newkey = NULL;
|
||
|
|
}
|
||
|
|
else if (destructor != NULL)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Have to manage associations between thread and key;
|
||
|
|
* Therefore, need a lock that allows competing threads
|
||
|
|
* to gain exclusive access to the key->threads list.
|
||
|
|
*
|
||
|
|
* The mutex will only be created when it is first locked.
|
||
|
|
*/
|
||
|
|
newkey->keyLock = 0;
|
||
|
|
newkey->destructor = destructor;
|
||
|
|
}
|
||
|
|
|
||
|
|
*key = newkey;
|
||
|
|
|
||
|
|
return (result);
|
||
|
|
}
|