summaryrefslogtreecommitdiff
path: root/libpthread/nptl/pthread_getspecific.c
diff options
context:
space:
mode:
Diffstat (limited to 'libpthread/nptl/pthread_getspecific.c')
-rw-r--r--libpthread/nptl/pthread_getspecific.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/libpthread/nptl/pthread_getspecific.c b/libpthread/nptl/pthread_getspecific.c
new file mode 100644
index 000000000..639a4fdeb
--- /dev/null
+++ b/libpthread/nptl/pthread_getspecific.c
@@ -0,0 +1,69 @@
+/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ The GNU C 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 2.1 of the License, or (at your option) any later version.
+
+ The GNU C 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 the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <stdlib.h>
+#include "pthreadP.h"
+
+
+void *
+attribute_protected
+__pthread_getspecific (pthread_key_t key)
+{
+ struct pthread_key_data *data;
+
+ /* Special case access to the first 2nd-level block. This is the
+ usual case. */
+ if (__builtin_expect (key < PTHREAD_KEY_2NDLEVEL_SIZE, 1))
+ data = &THREAD_SELF->specific_1stblock[key];
+ else
+ {
+ /* Verify the key is sane. */
+ if (key >= PTHREAD_KEYS_MAX)
+ /* Not valid. */
+ return NULL;
+
+ unsigned int idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;
+ unsigned int idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;
+
+ /* If the sequence number doesn't match or the key cannot be defined
+ for this thread since the second level array is not allocated
+ return NULL, too. */
+ struct pthread_key_data *level2 = THREAD_GETMEM_NC (THREAD_SELF,
+ specific, idx1st);
+ if (level2 == NULL)
+ /* Not allocated, therefore no data. */
+ return NULL;
+
+ /* There is data. */
+ data = &level2[idx2nd];
+ }
+
+ void *result = data->data;
+ if (result != NULL)
+ {
+ uintptr_t seq = data->seq;
+
+ if (__builtin_expect (seq != __pthread_keys[key].seq, 0))
+ result = data->data = NULL;
+ }
+
+ return result;
+}
+strong_alias (__pthread_getspecific, pthread_getspecific)
+strong_alias (__pthread_getspecific, __pthread_getspecific_internal)