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- /* Copyright (C) 2002, 2003, 2005 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 <shlib-compat.h>
- #include <pthread-errnos.h>
- #ifndef UP
- # define LOCK lock
- #else
- # define
- #endif
- #define SYS_futex 202
- #define FUTEX_WAKE 1
- .text
- .globl sem_post
- .type sem_post,@function
- .align 16
- sem_post:
- movl $1, %edx
- LOCK
- xaddl %edx, (%rdi)
- movl $SYS_futex, %eax
- movl $FUTEX_WAKE, %esi
- incl %edx
- syscall
- testq %rax, %rax
- js 1f
- xorl %eax, %eax
- retq
- 1:
- #if USE___THREAD
- movq errno@gottpoff(%rip), %rdx
- movl $EINVAL, %fs:(%rdx)
- #else
- callq __errno_location@plt
- movl $EINVAL, (%rax)
- #endif
- orl $-1, %eax
- retq
- .size sem_post,.-sem_post
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