1 /* 2 * pthread_setspecific.c 3 * 4 * Description: 5 * POSIX thread functions which implement thread-specific data (TSD). 6 * 7 * -------------------------------------------------------------------------- 8 * 9 * Pthreads-win32 - POSIX Threads Library for Win32 10 * Copyright(C) 1998 John E. Bossom 11 * Copyright(C) 1999,2005 Pthreads-win32 contributors 12 * 13 * Contact Email: rpj (at) callisto.canberra.edu.au 14 * 15 * The current list of contributors is contained 16 * in the file CONTRIBUTORS included with the source 17 * code distribution. The list can also be seen at the 18 * following World Wide Web location: 19 * http://sources.redhat.com/pthreads-win32/contributors.html 20 * 21 * This library is free software; you can redistribute it and/or 22 * modify it under the terms of the GNU Lesser General Public 23 * License as published by the Free Software Foundation; either 24 * version 2 of the License, or (at your option) any later version. 25 * 26 * This library is distributed in the hope that it will be useful, 27 * but WITHOUT ANY WARRANTY; without even the implied warranty of 28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 29 * Lesser General Public License for more details. 30 * 31 * You should have received a copy of the GNU Lesser General Public 32 * License along with this library in the file COPYING.LIB; 33 * if not, write to the Free Software Foundation, Inc., 34 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 35 */ 36 37 #include "pthread.h" 38 #include "implement.h" 39 40 41 int 42 pthread_setspecific (pthread_key_t key, const void *value) 43 /* 44 * ------------------------------------------------------ 45 * DOCPUBLIC 46 * This function sets the value of the thread specific 47 * key in the calling thread. 48 * 49 * PARAMETERS 50 * key 51 * an instance of pthread_key_t 52 * value 53 * the value to set key to 54 * 55 * 56 * DESCRIPTION 57 * This function sets the value of the thread specific 58 * key in the calling thread. 59 * 60 * RESULTS 61 * 0 successfully set value 62 * EAGAIN could not set value 63 * ENOENT SERIOUS!! 64 * 65 * ------------------------------------------------------ 66 */ 67 { 68 pthread_t self; 69 int result = 0; 70 71 if (key != ptw32_selfThreadKey) 72 { 73 /* 74 * Using pthread_self will implicitly create 75 * an instance of pthread_t for the current 76 * thread if one wasn't explicitly created 77 */ 78 self = pthread_self (); 79 if (self.p == NULL) 80 { 81 return ENOENT; 82 } 83 } 84 else 85 { 86 /* 87 * Resolve catch-22 of registering thread with selfThread 88 * key 89 */ 90 ptw32_thread_t * sp = (ptw32_thread_t *) pthread_getspecific (ptw32_selfThreadKey); 91 92 if (sp == NULL) 93 { 94 if (value == NULL) 95 { 96 return ENOENT; 97 } 98 self = *((pthread_t *) value); 99 } 100 else 101 { 102 self = sp->ptHandle; 103 } 104 } 105 106 result = 0; 107 108 if (key != NULL) 109 { 110 if (self.p != NULL && key->destructor != NULL && value != NULL) 111 { 112 ptw32_mcs_local_node_t keyLock; 113 ptw32_mcs_local_node_t threadLock; 114 ptw32_thread_t * sp = (ptw32_thread_t *) self.p; 115 /* 116 * Only require associations if we have to 117 * call user destroy routine. 118 * Don't need to locate an existing association 119 * when setting data to NULL for WIN32 since the 120 * data is stored with the operating system; not 121 * on the association; setting assoc to NULL short 122 * circuits the search. 123 */ 124 ThreadKeyAssoc *assoc; 125 126 ptw32_mcs_lock_acquire(&(key->keyLock), &keyLock); 127 ptw32_mcs_lock_acquire(&(sp->threadLock), &threadLock); 128 129 assoc = (ThreadKeyAssoc *) sp->keys; 130 /* 131 * Locate existing association 132 */ 133 while (assoc != NULL) 134 { 135 if (assoc->key == key) 136 { 137 /* 138 * Association already exists 139 */ 140 break; 141 } 142 assoc = assoc->nextKey; 143 } 144 145 /* 146 * create an association if not found 147 */ 148 if (assoc == NULL) 149 { 150 result = ptw32_tkAssocCreate (sp, key); 151 } 152 153 ptw32_mcs_lock_release(&threadLock); 154 ptw32_mcs_lock_release(&keyLock); 155 } 156 157 if (result == 0) 158 { 159 if (!TlsSetValue (key->key, (LPVOID) value)) 160 { 161 result = EAGAIN; 162 } 163 } 164 } 165 166 return (result); 167 } /* pthread_setspecific */ 168