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/* Copyright (C) 2002, 2003 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
.text
.globl sem_wait
.type sem_wait,@function
.align 16
cfi_startproc
sem_wait:
/* First check for cancellation. */
movl %fs:CANCELHANDLING, %eax
andl $0xfffffff9, %eax
cmpl $8, %eax
je 4f
pushq %r12
cfi_adjust_cfa_offset(8)
cfi_offset(12, -16)
pushq %r13
cfi_adjust_cfa_offset(8)
movq %rdi, %r13
cfi_offset(13, -24)
3: movl (%r13), %eax
2: testl %eax, %eax
je 1f
leaq -1(%rax), %rdx
LOCK
cmpxchgl %edx, (%r13)
jne 2b
xorl %eax, %eax
popq %r13
cfi_adjust_cfa_offset(-8)
cfi_restore(13)
popq %r12
cfi_adjust_cfa_offset(-8)
cfi_restore(12)
retq
cfi_adjust_cfa_offset(16)
cfi_offset(12, -16)
cfi_offset(13, -24)
1: call __pthread_enable_asynccancel
movl %eax, %r8d
xorq %r10, %r10
movq $SYS_futex, %rax
movq %r13, %rdi
movq %r10, %rsi
movq %r10, %rdx
syscall
movq %rax, %r12
movl %r8d, %edi
call __pthread_disable_asynccancel
testq %r12, %r12
je 3b
cmpq $-EWOULDBLOCK, %r12
je 3b
negq %r12
#if USE___THREAD
movq errno@gottpoff(%rip), %rdx
movl %r12d, %fs:(%rdx)
#else
callq __errno_location@plt
movl %r12d, (%rax)
#endif
orl $-1, %eax
popq %r13
cfi_adjust_cfa_offset(-8)
cfi_restore(13)
popq %r12
cfi_adjust_cfa_offset(-8)
cfi_restore(12)
retq
4: /* Canceled. */
movq $0xffffffffffffffff, %fs:RESULT
LOCK
orl $0x10, %fs:CANCELHANDLING
movq %fs:CLEANUP_JMP_BUF, %rdi
jmp HIDDEN_JUMPTARGET (__pthread_unwind)
cfi_endproc
.size sem_wait,.-sem_wait
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