diff options
Diffstat (limited to 'nptl/sysdeps/i386/pthread_spin_lock.S')
| -rw-r--r-- | nptl/sysdeps/i386/pthread_spin_lock.S | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/nptl/sysdeps/i386/pthread_spin_lock.S b/nptl/sysdeps/i386/pthread_spin_lock.S new file mode 100644 index 0000000000..ba9b18e492 --- /dev/null +++ b/nptl/sysdeps/i386/pthread_spin_lock.S @@ -0,0 +1,37 @@ +/* Copyright (C) 2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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 <lowlevellock.h> + + .globl pthread_spin_lock + .type pthread_spin_lock,@function + .align 16 +pthread_spin_lock: + mov 4(%esp), %eax +1: LOCK + decl 0(%eax) + jne 2f + xor %eax, %eax + ret + + .align 16 +2: rep + nop + cmpl $0, 0(%eax) + jg 1b + jmp 2b + .size pthread_spin_lock,.-pthread_spin_lock |