From 0b3366f6a93ac0f7e2028745ea557c0acd8722c6 Mon Sep 17 00:00:00 2001 From: "\"Steven J. Hill\"" Date: Sat, 7 May 2005 02:04:55 +0000 Subject: Import in NPTL code from glibc. For further information please consult the 'README.NPTL' file. --- .../nptl/sysdeps/powerpc/pthread_spin_trylock.c | 43 ++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 libpthread/nptl/sysdeps/powerpc/pthread_spin_trylock.c (limited to 'libpthread/nptl/sysdeps/powerpc/pthread_spin_trylock.c') diff --git a/libpthread/nptl/sysdeps/powerpc/pthread_spin_trylock.c b/libpthread/nptl/sysdeps/powerpc/pthread_spin_trylock.c new file mode 100644 index 000000000..d8e1dbcc8 --- /dev/null +++ b/libpthread/nptl/sysdeps/powerpc/pthread_spin_trylock.c @@ -0,0 +1,43 @@ +/* Copyright (C) 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Paul Mackerras , 2003. + + 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 +#include "pthreadP.h" + +int +pthread_spin_trylock (lock) + pthread_spinlock_t *lock; +{ + unsigned int old; + int err = EBUSY; + + asm ("1: lwarx %0,0,%2\n" + " cmpwi 0,%0,0\n" + " bne 2f\n" + " stwcx. %3,0,%2\n" + " bne- 1b\n" + " li %1,0\n" + " isync\n" + "2: " + : "=&r" (old), "=&r" (err) + : "r" (lock), "r" (1), "1" (err) + : "cr0", "memory"); + + return err; +} -- cgit v1.2.3