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- /* Copyright (C) 2002, 2003, 2005, 2007, 2008 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>
- #include <structsem.h>
- .text
- .globl sem_post
- .type sem_post,@function
- .align 16
- sem_post:
- #if VALUE == 0
- movl (%rdi), %eax
- #else
- movl VALUE(%rdi), %eax
- #endif
- 0: cmpl $SEM_VALUE_MAX, %eax
- je 3f
- leal 1(%rax), %esi
- LOCK
- #if VALUE == 0
- cmpxchgl %esi, (%rdi)
- #else
- cmpxchgl %esi, VALUE(%rdi)
- #endif
- jnz 0b
- cmpq $0, NWAITERS(%rdi)
- je 2f
- movl $SYS_futex, %eax
- movl $FUTEX_WAKE, %esi
- orl PRIVATE(%rdi), %esi
- movl $1, %edx
- syscall
- testq %rax, %rax
- js 1f
- 2: xorl %eax, %eax
- retq
- 1:
- #if USE___THREAD
- movl $EINVAL, %eax
- #else
- callq __errno_location@plt
- movl $EINVAL, %edx
- #endif
- jmp 4f
- 3:
- #if USE___THREAD
- movl $EOVERFLOW, %eax
- #else
- callq __errno_location@plt
- movl $EOVERFLOW, %edx
- #endif
- 4:
- #if USE___THREAD
- movq errno@gottpoff(%rip), %rdx
- movl %eax, %fs:(%rdx)
- #else
- movl %edx, (%rax)
- #endif
- orl $-1, %eax
- retq
- .size sem_post,.-sem_post
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