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-rw-r--r--libpthread/nptl/pthread_key_delete.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/libpthread/nptl/pthread_key_delete.c b/libpthread/nptl/pthread_key_delete.c
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+++ b/libpthread/nptl/pthread_key_delete.c
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+/* 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 <errno.h>
+#include "pthreadP.h"
+#include <atomic.h>
+
+
+int
+pthread_key_delete (key)
+ pthread_key_t key;
+{
+ int result = EINVAL;
+
+ if (__builtin_expect (key < PTHREAD_KEYS_MAX, 1))
+ {
+ unsigned int seq = __pthread_keys[key].seq;
+
+ if (__builtin_expect (! KEY_UNUSED (seq), 1)
+ && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[key].seq,
+ seq + 1, seq))
+ /* We deleted a valid key. */
+ result = 0;
+ }
+
+ return result;
+}