1*062c5bc4SJason Schmidlapp /*
2*062c5bc4SJason Schmidlapp * pthread_key_create.c
3*062c5bc4SJason Schmidlapp *
4*062c5bc4SJason Schmidlapp * Description:
5*062c5bc4SJason Schmidlapp * POSIX thread functions which implement thread-specific data (TSD).
6*062c5bc4SJason Schmidlapp *
7*062c5bc4SJason Schmidlapp * --------------------------------------------------------------------------
8*062c5bc4SJason Schmidlapp *
9*062c5bc4SJason Schmidlapp * Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
10*062c5bc4SJason Schmidlapp * Copyright(C) 2008 Jason Schmidlapp
11*062c5bc4SJason Schmidlapp *
12*062c5bc4SJason Schmidlapp * Contact Email: jschmidlapp@users.sourceforge.net
13*062c5bc4SJason Schmidlapp *
14*062c5bc4SJason Schmidlapp *
15*062c5bc4SJason Schmidlapp * Based upon Pthreads-win32 - POSIX Threads Library for Win32
16*062c5bc4SJason Schmidlapp * Copyright(C) 1998 John E. Bossom
17*062c5bc4SJason Schmidlapp * Copyright(C) 1999,2005 Pthreads-win32 contributors
18*062c5bc4SJason Schmidlapp *
19*062c5bc4SJason Schmidlapp * Contact Email: rpj@callisto.canberra.edu.au
20*062c5bc4SJason Schmidlapp *
21*062c5bc4SJason Schmidlapp * The original list of contributors to the Pthreads-win32 project
22*062c5bc4SJason Schmidlapp * is contained in the file CONTRIBUTORS.ptw32 included with the
23*062c5bc4SJason Schmidlapp * source code distribution. The list can also be seen at the
24*062c5bc4SJason Schmidlapp * following World Wide Web location:
25*062c5bc4SJason Schmidlapp * http://sources.redhat.com/pthreads-win32/contributors.html
26*062c5bc4SJason Schmidlapp *
27*062c5bc4SJason Schmidlapp * This library is free software; you can redistribute it and/or
28*062c5bc4SJason Schmidlapp * modify it under the terms of the GNU Lesser General Public
29*062c5bc4SJason Schmidlapp * License as published by the Free Software Foundation; either
30*062c5bc4SJason Schmidlapp * version 2 of the License, or (at your option) any later version.
31*062c5bc4SJason Schmidlapp *
32*062c5bc4SJason Schmidlapp * This library is distributed in the hope that it will be useful,
33*062c5bc4SJason Schmidlapp * but WITHOUT ANY WARRANTY; without even the implied warranty of
34*062c5bc4SJason Schmidlapp * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
35*062c5bc4SJason Schmidlapp * Lesser General Public License for more details.
36*062c5bc4SJason Schmidlapp *
37*062c5bc4SJason Schmidlapp * You should have received a copy of the GNU Lesser General Public
38*062c5bc4SJason Schmidlapp * License along with this library in the file COPYING.LIB;
39*062c5bc4SJason Schmidlapp * if not, write to the Free Software Foundation, Inc.,
40*062c5bc4SJason Schmidlapp * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
41*062c5bc4SJason Schmidlapp */
42*062c5bc4SJason Schmidlapp
43*062c5bc4SJason Schmidlapp #include <stdlib.h>
44*062c5bc4SJason Schmidlapp
45*062c5bc4SJason Schmidlapp #include "pte_osal.h"
46*062c5bc4SJason Schmidlapp
47*062c5bc4SJason Schmidlapp #include "pthread.h"
48*062c5bc4SJason Schmidlapp #include "implement.h"
49*062c5bc4SJason Schmidlapp
50*062c5bc4SJason Schmidlapp
51*062c5bc4SJason Schmidlapp int
pthread_key_create(pthread_key_t * key,void (* destructor)(void *))52*062c5bc4SJason Schmidlapp pthread_key_create (pthread_key_t * key, void (*destructor) (void *))
53*062c5bc4SJason Schmidlapp /*
54*062c5bc4SJason Schmidlapp * ------------------------------------------------------
55*062c5bc4SJason Schmidlapp * DOCPUBLIC
56*062c5bc4SJason Schmidlapp * This function creates a thread-specific data key visible
57*062c5bc4SJason Schmidlapp * to all threads. All existing and new threads have a value
58*062c5bc4SJason Schmidlapp * NULL for key until set using pthread_setspecific. When any
59*062c5bc4SJason Schmidlapp * thread with a non-NULL value for key terminates, 'destructor'
60*062c5bc4SJason Schmidlapp * is called with key's current value for that thread.
61*062c5bc4SJason Schmidlapp *
62*062c5bc4SJason Schmidlapp * PARAMETERS
63*062c5bc4SJason Schmidlapp * key
64*062c5bc4SJason Schmidlapp * pointer to an instance of pthread_key_t
65*062c5bc4SJason Schmidlapp *
66*062c5bc4SJason Schmidlapp *
67*062c5bc4SJason Schmidlapp * DESCRIPTION
68*062c5bc4SJason Schmidlapp * This function creates a thread-specific data key visible
69*062c5bc4SJason Schmidlapp * to all threads. All existing and new threads have a value
70*062c5bc4SJason Schmidlapp * NULL for key until set using pthread_setspecific. When any
71*062c5bc4SJason Schmidlapp * thread with a non-NULL value for key terminates, 'destructor'
72*062c5bc4SJason Schmidlapp * is called with key's current value for that thread.
73*062c5bc4SJason Schmidlapp *
74*062c5bc4SJason Schmidlapp * RESULTS
75*062c5bc4SJason Schmidlapp * 0 successfully created semaphore,
76*062c5bc4SJason Schmidlapp * EAGAIN insufficient resources or PTHREAD_KEYS_MAX
77*062c5bc4SJason Schmidlapp * exceeded,
78*062c5bc4SJason Schmidlapp * ENOMEM insufficient memory to create the key,
79*062c5bc4SJason Schmidlapp *
80*062c5bc4SJason Schmidlapp * ------------------------------------------------------
81*062c5bc4SJason Schmidlapp */
82*062c5bc4SJason Schmidlapp {
83*062c5bc4SJason Schmidlapp int result = 0;
84*062c5bc4SJason Schmidlapp pthread_key_t newkey;
85*062c5bc4SJason Schmidlapp
86*062c5bc4SJason Schmidlapp if ((newkey = (pthread_key_t) calloc (1, sizeof (*newkey))) == NULL)
87*062c5bc4SJason Schmidlapp {
88*062c5bc4SJason Schmidlapp result = ENOMEM;
89*062c5bc4SJason Schmidlapp }
90*062c5bc4SJason Schmidlapp else
91*062c5bc4SJason Schmidlapp {
92*062c5bc4SJason Schmidlapp pte_osResult osResult = pte_osTlsAlloc(&(newkey->key));
93*062c5bc4SJason Schmidlapp
94*062c5bc4SJason Schmidlapp if (osResult != PTE_OS_OK)
95*062c5bc4SJason Schmidlapp {
96*062c5bc4SJason Schmidlapp result = EAGAIN;
97*062c5bc4SJason Schmidlapp
98*062c5bc4SJason Schmidlapp free (newkey);
99*062c5bc4SJason Schmidlapp newkey = NULL;
100*062c5bc4SJason Schmidlapp }
101*062c5bc4SJason Schmidlapp else if (destructor != NULL)
102*062c5bc4SJason Schmidlapp {
103*062c5bc4SJason Schmidlapp /*
104*062c5bc4SJason Schmidlapp * Have to manage associations between thread and key;
105*062c5bc4SJason Schmidlapp * Therefore, need a lock that allows multiple threads
106*062c5bc4SJason Schmidlapp * to gain exclusive access to the key->threads list.
107*062c5bc4SJason Schmidlapp *
108*062c5bc4SJason Schmidlapp * The mutex will only be created when it is first locked.
109*062c5bc4SJason Schmidlapp */
110*062c5bc4SJason Schmidlapp newkey->keyLock = PTHREAD_MUTEX_INITIALIZER;
111*062c5bc4SJason Schmidlapp newkey->destructor = destructor;
112*062c5bc4SJason Schmidlapp }
113*062c5bc4SJason Schmidlapp
114*062c5bc4SJason Schmidlapp }
115*062c5bc4SJason Schmidlapp
116*062c5bc4SJason Schmidlapp *key = newkey;
117*062c5bc4SJason Schmidlapp
118*062c5bc4SJason Schmidlapp return (result);
119*062c5bc4SJason Schmidlapp }
120