/* 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, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include <kernel-features.h>#include <tcb-offsets.h>#include <lowlevellock.h>	.comm	__fork_generation, 4, 4	.text	.globl	__pthread_once	.type	__pthread_once,@function	.align	16__pthread_once:.LSTARTCODE:	testl	$2, (%rdi)	jz	1f	xorl	%eax, %eax	retq	/* Preserve the function pointer.  */1:	pushq	%rsi.Lpush_rsi:	xorq	%r10, %r10	/* Not yet initialized or initialization in progress.	   Get the fork generation counter now.  */6:	movl	(%rdi), %eax5:	movl	%eax, %edx	testl	$2, %eax	jnz	4f	andl	$3, %edx	orl	__fork_generation(%rip), %edx	orl	$1, %edx	LOCK	cmpxchgl %edx, (%rdi)	jnz	5b	/* Check whether another thread already runs the initializer.  */	testl	$1, %eax	jz	3f	/* No -> do it.  */	/* Check whether the initializer execution was interrupted	   by a fork.  */	xorl	%edx, %eax	testl	$0xfffffffc, %eax	jnz	3f	/* Different for generation -> run initializer.  */	/* Somebody else got here first.  Wait.  */#ifdef __ASSUME_PRIVATE_FUTEX	movl	$FUTEX_WAIT|FUTEX_PRIVATE_FLAG, %esi#else# if FUTEX_WAIT == 0	movl	%fs:PRIVATE_FUTEX, %esi# else	movl	$FUTEX_WAIT, %esi	orl	%fs:PRIVATE_FUTEX, %esi# endif#endif	movl	$SYS_futex, %eax	syscall	jmp	6b	/* Preserve the pointer to the control variable.  */3:	pushq	%rdi.Lpush_rdi:	pushq	%rdi.Lpush_rdi2:.LcleanupSTART:	callq	*16(%rsp).LcleanupEND:	/* Get the control variable address back.  */	popq	%rdi.Lpop_rdi:	/* Sucessful run of the initializer.  Signal that we are done.  */	LOCK	incl	(%rdi)	addq	$8, %rsp.Ladd1:	/* Wake up all other threads.  */	movl	$0x7fffffff, %edx#ifdef __ASSUME_PRIVATE_FUTEX	movl	$FUTEX_WAKE|FUTEX_PRIVATE_FLAG, %esi#else	movl	$FUTEX_WAKE, %esi	orl	%fs:PRIVATE_FUTEX, %esi#endif	movl	$SYS_futex, %eax	syscall4:	addq	$8, %rsp.Ladd2:	xorl	%eax, %eax	retq	.size	__pthread_once,.-__pthread_once	.globl	__pthread_once_internal__pthread_once_internal = __pthread_once	.globl	pthread_oncepthread_once = __pthread_once	.type	clear_once_control,@function	.align	16clear_once_control:	movq	(%rsp), %rdi	movq	%rax, %r8	movl	$0, (%rdi)	movl	$0x7fffffff, %edx#ifdef __ASSUME_PRIVATE_FUTEX	movl	$FUTEX_WAKE|FUTEX_PRIVATE_FLAG, %esi#else	movl	$FUTEX_WAKE, %esi	orl	%fs:PRIVATE_FUTEX, %esi#endif	movl	$SYS_futex, %eax	syscall	movq	%r8, %rdi.LcallUR:	call	_Unwind_Resume@PLT	hlt.LENDCODE:	.size	clear_once_control,.-clear_once_control	.section .gcc_except_table,"a",@progbits.LexceptSTART:	.byte	0xff				# @LPStart format (omit)	.byte	0xff				# @TType format (omit)	.byte	0x01				# call-site format						# DW_EH_PE_uleb128	.uleb128 .Lcstend-.Lcstbegin.Lcstbegin:	.uleb128 .LcleanupSTART-.LSTARTCODE	.uleb128 .LcleanupEND-.LcleanupSTART	.uleb128 clear_once_control-.LSTARTCODE	.uleb128  0	.uleb128 .LcallUR-.LSTARTCODE	.uleb128 .LENDCODE-.LcallUR	.uleb128 0	.uleb128  0.Lcstend:	.section .eh_frame,"a",@progbits.LSTARTFRAME:	.long	.LENDCIE-.LSTARTCIE		# Length of the CIE..LSTARTCIE:	.long	0				# CIE ID.	.byte	1				# Version number.#ifdef SHARED	.string	"zPLR"				# NUL-terminated augmentation						# string.#else	.string	"zPL"				# NUL-terminated augmentation						# string.#endif	.uleb128 1				# Code alignment factor.	.sleb128 -8				# Data alignment factor.	.byte	16				# Return address register						# column.#ifdef SHARED	.uleb128 7				# Augmentation value length.	.byte	0x9b				# Personality: DW_EH_PE_pcrel						# + DW_EH_PE_sdata4						# + DW_EH_PE_indirect	.long	DW.ref.__gcc_personality_v0-.	.byte	0x1b				# LSDA Encoding: DW_EH_PE_pcrel						# + DW_EH_PE_sdata4.	.byte	0x1b				# FDE Encoding: DW_EH_PE_pcrel						# + DW_EH_PE_sdata4.#else	.uleb128 10				# Augmentation value length.	.byte	0x0				# Personality: absolute	.quad	__gcc_personality_v0	.byte	0x0				# LSDA Encoding: absolute#endif	.byte 0x0c				# DW_CFA_def_cfa	.uleb128 7	.uleb128 8	.byte	0x90				# DW_CFA_offset, column 0x10	.uleb128 1	.align 8.LENDCIE:	.long	.LENDFDE-.LSTARTFDE		# Length of the FDE..LSTARTFDE:	.long	.LSTARTFDE-.LSTARTFRAME		# CIE pointer.#ifdef SHARED	.long	.LSTARTCODE-.			# PC-relative start address						# of the code.	.long	.LENDCODE-.LSTARTCODE		# Length of the code.	.uleb128 4				# Augmentation size	.long	.LexceptSTART-.#else	.quad	.LSTARTCODE			# Start address of the code.	.quad	.LENDCODE-.LSTARTCODE		# Length of the code.	.uleb128 8				# Augmentation size	.quad	.LexceptSTART#endif	.byte	4				# DW_CFA_advance_loc4	.long	.Lpush_rsi-.LSTARTCODE	.byte	14				# DW_CFA_def_cfa_offset	.uleb128 16	.byte	4				# DW_CFA_advance_loc4	.long	.Lpush_rdi-.Lpush_rsi	.byte	14				# DW_CFA_def_cfa_offset	.uleb128 24	.byte	4				# DW_CFA_advance_loc4	.long	.Lpush_rdi2-.Lpush_rdi	.byte	14				# DW_CFA_def_cfa_offset	.uleb128 32	.byte	4				# DW_CFA_advance_loc4	.long	.Lpop_rdi-.Lpush_rdi2	.byte	14				# DW_CFA_def_cfa_offset	.uleb128 24	.byte	4				# DW_CFA_advance_loc4	.long	.Ladd1-.Lpop_rdi	.byte	14				# DW_CFA_def_cfa_offset	.uleb128 16	.byte	4				# DW_CFA_advance_loc4	.long	.Ladd2-.Ladd1	.byte	14				# DW_CFA_def_cfa_offset	.uleb128 8	.byte	4				# DW_CFA_advance_loc4	.long	clear_once_control-.Ladd2	.byte	14				# DW_CFA_def_cfa_offset	.uleb128 32#if 0	.byte	4				# DW_CFA_advance_loc4	.long	.Lpop_rdi3-clear_once_control	.byte	14				# DW_CFA_def_cfa_offset	.uleb128 16#endif	.align	8.LENDFDE:#ifdef SHARED	.hidden	DW.ref.__gcc_personality_v0	.weak	DW.ref.__gcc_personality_v0	.section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits	.align	8	.type	DW.ref.__gcc_personality_v0, @object	.size	DW.ref.__gcc_personality_v0, 8DW.ref.__gcc_personality_v0:	.quad	__gcc_personality_v0#endif