Update

[l4.git] / l4 / pkg / l4re-core / uclibc / lib / contrib / uclibc / libpthread / nptl / pthread_key_create.c

diff --git a/l4/pkg/l4re-core/uclibc/lib/contrib/uclibc/libpthread/nptl/pthread_key_create.c b/l4/pkg/l4re-core/uclibc/lib/contrib/uclibc/libpthread/nptl/pthread_key_create.c
new file mode 100644 (file)
index 0000000..6e11bbe
--- /dev/null
+++ b/l4/pkg/l4re-core/uclibc/lib/contrib/uclibc/libpthread/nptl/pthread_key_create.c
@@ -0,0 +1,55 @@
+/* Copyright (C) 2002, 2003, 2006 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include "pthreadP.h"
+#include <atomic.h>
+
+
+int
+attribute_protected
+__pthread_key_create (
+     pthread_key_t *key,
+     void (*destr) (void *))
+{
+  /* Find a slot in __pthread_kyes which is unused.  */
+  size_t cnt;
+  for (cnt = 0; cnt < PTHREAD_KEYS_MAX; ++cnt)
+    {
+      uintptr_t seq = __pthread_keys[cnt].seq;
+
+      if (KEY_UNUSED (seq) && KEY_USABLE (seq)
+         /* We found an unused slot.  Try to allocate it.  */
+         && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[cnt].seq,
+                                                    seq + 1, seq))
+       {
+         /* Remember the destructor.  */
+         __pthread_keys[cnt].destr = destr;
+
+         /* Return the key to the caller.  */
+         *key = cnt;
+
+         /* The call succeeded.  */
+         return 0;
+       }
+    }
+
+  return EAGAIN;
+}
+strong_alias (__pthread_key_create, pthread_key_create)
+strong_alias (__pthread_key_create, __pthread_key_create_internal)