| /* 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <sysdep.h> |
| #include <lowlevellock.h> |
| #include <shlib-compat.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 |
