mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/* Copyright (C) 2003-2017 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" MUTEX_HINT_ACQ "\n"
|
|
" cmpwi 0,%0,0\n"
|
|
" bne 2f\n"
|
|
" stwcx. %3,0,%2\n"
|
|
" bne- 1b\n"
|
|
" li %1,0\n"
|
|
__ARCH_ACQ_INSTR "\n"
|
|
"2: "
|
|
: "=&r" (old), "=&r" (err)
|
|
: "r" (lock), "r" (1), "1" (err)
|
|
: "cr0", "memory");
|
|
|
|
return err;
|
|
}
|