Loading...
/* Copyright (C) 2003 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Paul Mackerras <paulus@au.ibm.com>, 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, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include "pthreadP.h" int pthread_spin_trylock (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; } |