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- /* 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, see
- <http://www.gnu.org/licenses/>. */
- #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
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