diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/sem_trywait.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/sem_trywait.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/sem_trywait.S b/sysdeps/unix/sysv/linux/x86_64/sem_trywait.S new file mode 100644 index 0000000000..1893a34737 --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86_64/sem_trywait.S @@ -0,0 +1,47 @@ +/* Copyright (C) 2002-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + 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 <sysdep.h> +#include <lowlevellock.h> +#include <shlib-compat.h> +#include <pthread-errnos.h> + + .text + + .globl sem_trywait + .type sem_trywait,@function + .align 16 +sem_trywait: + movl (%rdi), %eax +2: testl %eax, %eax + jz 1f + + leal -1(%rax), %edx + LOCK + cmpxchgl %edx, (%rdi) + jne 2b + + xorl %eax, %eax + retq + +1: + movq errno@gottpoff(%rip), %rdx + movl $EAGAIN, %fs:(%rdx) + orl $-1, %eax + retq + .size sem_trywait,.-sem_trywait |