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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | /* Linuxthreads - a simple clone()-based implementation of Posix */ /* threads for Linux. */ /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ /* */ /* This program is free software; you can redistribute it and/or */ /* modify it under the terms of the GNU Library General Public License */ /* as published by the Free Software Foundation; either version 2 */ /* of the License, or (at your option) any later version. */ /* */ /* This program 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 Library General Public License for more details. */ /* Thread-specific data */ #include <features.h> #include <errno.h> #include <stddef.h> #include <stdlib.h> #include "pthread.h" #include "internals.h" #include "spinlock.h" #include "restart.h" /* Table of keys. */ static struct pthread_key_struct pthread_keys[PTHREAD_KEYS_MAX] = { { 0, NULL } }; /* For debugging purposes put the maximum number of keys in a variable. */ const int __linuxthreads_pthread_keys_max = PTHREAD_KEYS_MAX; const int __linuxthreads_pthread_key_2ndlevel_size = PTHREAD_KEY_2NDLEVEL_SIZE; /* Mutex to protect access to pthread_keys */ static pthread_mutex_t pthread_keys_mutex = PTHREAD_MUTEX_INITIALIZER; /* Create a new key */ int pthread_key_create(pthread_key_t * key, destr_function destr) { int i; __pthread_mutex_lock(&pthread_keys_mutex); for (i = 0; i < PTHREAD_KEYS_MAX; i++) { if (! pthread_keys[i].in_use) { /* Mark key in use */ pthread_keys[i].in_use = 1; pthread_keys[i].destr = destr; __pthread_mutex_unlock(&pthread_keys_mutex); *key = i; return 0; } } __pthread_mutex_unlock(&pthread_keys_mutex); return EAGAIN; } /* Delete a key */ int pthread_key_delete(pthread_key_t key) { pthread_descr self = thread_self(); __pthread_mutex_lock(&pthread_keys_mutex); if (key >= PTHREAD_KEYS_MAX || !pthread_keys[key].in_use) { __pthread_mutex_unlock(&pthread_keys_mutex); return EINVAL; } pthread_keys[key].in_use = 0; pthread_keys[key].destr = NULL; /* Set the value of the key to NULL in all running threads, so that if the key is reallocated later by pthread_key_create, its associated values will be NULL in all threads. Do nothing if no threads have been created yet. */ if (__pthread_manager_request != -1) { pthread_descr th; unsigned int idx1st, idx2nd; idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; th = self; do { /* If the thread already is terminated don't modify the memory. */ if (!th->p_terminated && th->p_specific[idx1st] != NULL) th->p_specific[idx1st][idx2nd] = NULL; th = th->p_nextlive; } while (th != self); } __pthread_mutex_unlock(&pthread_keys_mutex); return 0; } /* Set the value of a key */ int pthread_setspecific(pthread_key_t key, const void * pointer) { pthread_descr self = thread_self(); unsigned int idx1st, idx2nd; if (key >= PTHREAD_KEYS_MAX || !pthread_keys[key].in_use) return EINVAL; idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; if (THREAD_GETMEM_NC(self, p_specific[idx1st]) == NULL) { void *newp = calloc(PTHREAD_KEY_2NDLEVEL_SIZE, sizeof (void *)); if (newp == NULL) return ENOMEM; THREAD_SETMEM_NC(self, p_specific[idx1st], newp); } THREAD_GETMEM_NC(self, p_specific[idx1st])[idx2nd] = (void *) pointer; return 0; } /* Get the value of a key */ void * pthread_getspecific(pthread_key_t key) { pthread_descr self = thread_self(); unsigned int idx1st, idx2nd; if (key >= PTHREAD_KEYS_MAX) return NULL; idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; if (THREAD_GETMEM_NC(self, p_specific[idx1st]) == NULL || !pthread_keys[key].in_use) return NULL; return THREAD_GETMEM_NC(self, p_specific[idx1st])[idx2nd]; } /* Call the destruction routines on all keys */ void __pthread_destroy_specifics(void) { pthread_descr self = thread_self(); int i, j, round, found_nonzero; destr_function destr; void * data; for (round = 0, found_nonzero = 1; found_nonzero && round < PTHREAD_DESTRUCTOR_ITERATIONS; round++) { found_nonzero = 0; for (i = 0; i < PTHREAD_KEY_1STLEVEL_SIZE; i++) if (THREAD_GETMEM_NC(self, p_specific[i]) != NULL) for (j = 0; j < PTHREAD_KEY_2NDLEVEL_SIZE; j++) { destr = pthread_keys[i * PTHREAD_KEY_2NDLEVEL_SIZE + j].destr; data = THREAD_GETMEM_NC(self, p_specific[i])[j]; if (destr != NULL && data != NULL) { THREAD_GETMEM_NC(self, p_specific[i])[j] = NULL; destr(data); found_nonzero = 1; } } } __pthread_lock(THREAD_GETMEM(self, p_lock), self); for (i = 0; i < PTHREAD_KEY_1STLEVEL_SIZE; i++) { if (THREAD_GETMEM_NC(self, p_specific[i]) != NULL) { free(THREAD_GETMEM_NC(self, p_specific[i])); THREAD_SETMEM_NC(self, p_specific[i], NULL); } } __pthread_unlock(THREAD_GETMEM(self, p_lock)); } |