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glibc  2.9
pthread_spin_unlock.c
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00001 /* pthread_spin_unlock -- unlock a spin lock.  Generic version.
00002    Copyright (C) 2003 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include "pthreadP.h"
00022 #include <atomic.h>
00023 
00024 int
00025 pthread_spin_unlock (pthread_spinlock_t *lock)
00026 {
00027   __asm __volatile ("membar #StoreStore | #LoadStore");
00028   *lock = 0;
00029   return 0;
00030 }