diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_trywait.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_trywait.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_trywait.S b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_trywait.S new file mode 100644 index 000000000..7b7f63ddb --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_trywait.S @@ -0,0 +1,52 @@ +/* Copyright (C) 2002, 2003, 2005, 2007 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <lowlevellock.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: +#if USE___THREAD + movq errno@gottpoff(%rip), %rdx + movl $EAGAIN, %fs:(%rdx) +#else + callq __errno_location@plt + movl $EAGAIN, (%rax) +#endif + orl $-1, %eax + retq + .size sem_trywait,.-sem_trywait |