libpthread/nptl: core of the "Native Posix Threading Library" for uClibc

targetting arm,sh,i386,mips,sparc for now

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

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..afb4d26ff
--- /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 *
+__pthread_getspecific (key)
+     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)