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glibc  2.9
pthread_spin_lock.c
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00001 /* Copyright (C) 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include "pthreadP.h"
00021 
00022 int
00023 pthread_spin_lock (lock)
00024      pthread_spinlock_t *lock;
00025 {
00026   int oldval;
00027 
00028   __asm __volatile ("0: lhi %0,0\n"
00029                   "   cs  %0,%2,%1\n"
00030                   "   jl  0b"
00031                   : "=&d" (oldval), "=Q" (*lock)
00032                   : "d" (1), "m" (*lock) : "cc" );
00033   return 0;
00034 }