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|
/* Copyright (C) 2002, 2003, 2004, 2006, 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 <sysdep.h>
#include <shlib-compat.h>
#include <lowlevellock.h>
#include <lowlevelcond.h>
#include <tcb-offsets.h>
#include <kernel-features.h>
.text
/* int pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex) */
.globl __pthread_cond_wait
.type __pthread_cond_wait, @function
.align 16
__pthread_cond_wait:
.LSTARTCODE:
pushl %edi
.Lpush_edi:
pushl %esi
.Lpush_esi:
pushl %ebx
.Lpush_ebx:
xorl %esi, %esi
movl 16(%esp), %ebx
/* Get internal lock. */
movl $1, %edx
xorl %eax, %eax
LOCK
#if cond_lock == 0
cmpxchgl %edx, (%ebx)
#else
cmpxchgl %edx, cond_lock(%ebx)
#endif
jnz 1f
/* Store the reference to the mutex. If there is already a
different value in there this is a bad user bug. */
2: cmpl $-1, dep_mutex(%ebx)
movl 20(%esp), %eax
je 15f
movl %eax, dep_mutex(%ebx)
/* Unlock the mutex. */
15: xorl %edx, %edx
call __pthread_mutex_unlock_usercnt
testl %eax, %eax
jne 12f
addl $1, total_seq(%ebx)
adcl $0, total_seq+4(%ebx)
addl $1, cond_futex(%ebx)
addl $(1 << nwaiters_shift), cond_nwaiters(%ebx)
#define FRAME_SIZE 16
subl $FRAME_SIZE, %esp
.Lsubl:
/* Get and store current wakeup_seq value. */
movl wakeup_seq(%ebx), %edi
movl wakeup_seq+4(%ebx), %edx
movl broadcast_seq(%ebx), %eax
movl %edi, 4(%esp)
movl %edx, 8(%esp)
movl %eax, 12(%esp)
8: movl cond_futex(%ebx), %edi
/* Unlock. */
LOCK
#if cond_lock == 0
subl $1, (%ebx)
#else
subl $1, cond_lock(%ebx)
#endif
jne 3f
.LcleanupSTART:
4: call __pthread_enable_asynccancel
movl %eax, (%esp)
#if FUTEX_PRIVATE_FLAG > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex(%ebx)
sete %cl
subl $1, %ecx
#ifdef __ASSUME_PRIVATE_FUTEX
andl $FUTEX_PRIVATE_FLAG, %ecx
#else
andl %gs:PRIVATE_FUTEX, %ecx
#endif
#if FUTEX_WAIT != 0
addl $FUTEX_WAIT, %ecx
#endif
movl %edi, %edx
addl $cond_futex, %ebx
.Ladd_cond_futex:
movl $SYS_futex, %eax
ENTER_KERNEL
subl $cond_futex, %ebx
.Lsub_cond_futex:
movl (%esp), %eax
call __pthread_disable_asynccancel
.LcleanupEND:
/* Lock. */
movl $1, %edx
xorl %eax, %eax
LOCK
#if cond_lock == 0
cmpxchgl %edx, (%ebx)
#else
cmpxchgl %edx, cond_lock(%ebx)
#endif
jnz 5f
6: movl broadcast_seq(%ebx), %eax
cmpl 12(%esp), %eax
jne 16f
movl woken_seq(%ebx), %eax
movl woken_seq+4(%ebx), %ecx
movl wakeup_seq(%ebx), %edi
movl wakeup_seq+4(%ebx), %edx
cmpl 8(%esp), %edx
jne 7f
cmpl 4(%esp), %edi
je 8b
7: cmpl %ecx, %edx
jne 9f
cmp %eax, %edi
je 8b
9: addl $1, woken_seq(%ebx)
adcl $0, woken_seq+4(%ebx)
/* Unlock */
16: subl $(1 << nwaiters_shift), cond_nwaiters(%ebx)
/* Wake up a thread which wants to destroy the condvar object. */
movl total_seq(%ebx), %eax
andl total_seq+4(%ebx), %eax
cmpl $0xffffffff, %eax
jne 17f
movl cond_nwaiters(%ebx), %eax
andl $~((1 << nwaiters_shift) - 1), %eax
jne 17f
addl $cond_nwaiters, %ebx
movl $SYS_futex, %eax
#if FUTEX_PRIVATE_FLAG > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex-cond_nwaiters(%ebx)
sete %cl
subl $1, %ecx
#ifdef __ASSUME_PRIVATE_FUTEX
andl $FUTEX_PRIVATE_FLAG, %ecx
#else
andl %gs:PRIVATE_FUTEX, %ecx
#endif
addl $FUTEX_WAKE, %ecx
movl $1, %edx
ENTER_KERNEL
subl $cond_nwaiters, %ebx
17: LOCK
#if cond_lock == 0
subl $1, (%ebx)
#else
subl $1, cond_lock(%ebx)
#endif
jne 10f
11: movl 20+FRAME_SIZE(%esp), %eax
call __pthread_mutex_cond_lock
addl $FRAME_SIZE, %esp
.Laddl:
14: popl %ebx
.Lpop_ebx:
popl %esi
.Lpop_esi:
popl %edi
.Lpop_edi:
/* We return the result of the mutex_lock operation. */
ret
/* Initial locking failed. */
1:
.LSbl1:
#if cond_lock == 0
movl %ebx, %edx
#else
leal cond_lock(%ebx), %edx
#endif
#if (LLL_SHARED-LLL_PRIVATE) > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex(%ebx)
setne %cl
subl $1, %ecx
andl $(LLL_SHARED-LLL_PRIVATE), %ecx
#if LLL_PRIVATE != 0
addl $LLL_PRIVATE, %ecx
#endif
call __lll_lock_wait
jmp 2b
/* Unlock in loop requires waekup. */
3:
.LSbl2:
#if cond_lock == 0
movl %ebx, %eax
#else
leal cond_lock(%ebx), %eax
#endif
#if (LLL_SHARED-LLL_PRIVATE) > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex(%ebx)
setne %cl
subl $1, %ecx
andl $(LLL_SHARED-LLL_PRIVATE), %ecx
#if LLL_PRIVATE != 0
addl $LLL_PRIVATE, %ecx
#endif
call __lll_unlock_wake
jmp 4b
/* Locking in loop failed. */
5:
#if cond_lock == 0
movl %ebx, %edx
#else
leal cond_lock(%ebx), %edx
#endif
#if (LLL_SHARED-LLL_PRIVATE) > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex(%ebx)
setne %cl
subl $1, %ecx
andl $(LLL_SHARED-LLL_PRIVATE), %ecx
#if LLL_PRIVATE != 0
addl $LLL_PRIVATE, %ecx
#endif
call __lll_lock_wait
jmp 6b
/* Unlock after loop requires wakeup. */
10:
#if cond_lock == 0
movl %ebx, %eax
#else
leal cond_lock(%ebx), %eax
#endif
#if (LLL_SHARED-LLL_PRIVATE) > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex(%ebx)
setne %cl
subl $1, %ecx
andl $(LLL_SHARED-LLL_PRIVATE), %ecx
#if LLL_PRIVATE != 0
addl $LLL_PRIVATE, %ecx
#endif
call __lll_unlock_wake
jmp 11b
/* The initial unlocking of the mutex failed. */
12:
.LSbl3:
LOCK
#if cond_lock == 0
subl $1, (%ebx)
#else
subl $1, cond_lock(%ebx)
#endif
jne 14b
movl %eax, %esi
#if cond_lock == 0
movl %ebx, %eax
#else
leal cond_lock(%ebx), %eax
#endif
#if (LLL_SHARED-LLL_PRIVATE) > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex(%ebx)
setne %cl
subl $1, %ecx
andl $(LLL_SHARED-LLL_PRIVATE), %ecx
#if LLL_PRIVATE != 0
addl $LLL_PRIVATE, %ecx
#endif
call __lll_unlock_wake
movl %esi, %eax
jmp 14b
.size __pthread_cond_wait, .-__pthread_cond_wait
versioned_symbol (libpthread, __pthread_cond_wait, pthread_cond_wait,
GLIBC_2_3_2)
.type __condvar_w_cleanup2, @function
__condvar_w_cleanup2:
subl $cond_futex, %ebx
.size __condvar_w_cleanup2, .-__condvar_w_cleanup2
.LSbl4:
.type __condvar_w_cleanup, @function
__condvar_w_cleanup:
movl %eax, %esi
/* Get internal lock. */
movl $1, %edx
xorl %eax, %eax
LOCK
#if cond_lock == 0
cmpxchgl %edx, (%ebx)
#else
cmpxchgl %edx, cond_lock(%ebx)
#endif
jz 1f
#if cond_lock == 0
movl %ebx, %edx
#else
leal cond_lock(%ebx), %edx
#endif
#if (LLL_SHARED-LLL_PRIVATE) > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex(%ebx)
setne %cl
subl $1, %ecx
andl $(LLL_SHARED-LLL_PRIVATE), %ecx
#if LLL_PRIVATE != 0
addl $LLL_PRIVATE, %ecx
#endif
call __lll_lock_wait
1: movl broadcast_seq(%ebx), %eax
cmpl 12(%esp), %eax
jne 3f
/* We increment the wakeup_seq counter only if it is lower than
total_seq. If this is not the case the thread was woken and
then canceled. In this case we ignore the signal. */
movl total_seq(%ebx), %eax
movl total_seq+4(%ebx), %edi
cmpl wakeup_seq+4(%ebx), %edi
jb 6f
ja 7f
cmpl wakeup_seq(%ebx), %eax
jbe 7f
6: addl $1, wakeup_seq(%ebx)
adcl $0, wakeup_seq+4(%ebx)
addl $1, cond_futex(%ebx)
7: addl $1, woken_seq(%ebx)
adcl $0, woken_seq+4(%ebx)
3: subl $(1 << nwaiters_shift), cond_nwaiters(%ebx)
/* Wake up a thread which wants to destroy the condvar object. */
xorl %edi, %edi
movl total_seq(%ebx), %eax
andl total_seq+4(%ebx), %eax
cmpl $0xffffffff, %eax
jne 4f
movl cond_nwaiters(%ebx), %eax
andl $~((1 << nwaiters_shift) - 1), %eax
jne 4f
addl $cond_nwaiters, %ebx
movl $SYS_futex, %eax
#if FUTEX_PRIVATE_FLAG > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex-cond_nwaiters(%ebx)
sete %cl
subl $1, %ecx
#ifdef __ASSUME_PRIVATE_FUTEX
andl $FUTEX_PRIVATE_FLAG, %ecx
#else
andl %gs:PRIVATE_FUTEX, %ecx
#endif
addl $FUTEX_WAKE, %ecx
movl $1, %edx
ENTER_KERNEL
subl $cond_nwaiters, %ebx
movl $1, %edi
4: LOCK
#if cond_lock == 0
subl $1, (%ebx)
#else
subl $1, cond_lock(%ebx)
#endif
je 2f
#if cond_lock == 0
movl %ebx, %eax
#else
leal cond_lock(%ebx), %eax
#endif
#if (LLL_SHARED-LLL_PRIVATE) > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex(%ebx)
setne %cl
subl $1, %ecx
andl $(LLL_SHARED-LLL_PRIVATE), %ecx
#if LLL_PRIVATE != 0
addl $LLL_PRIVATE, %ecx
#endif
call __lll_unlock_wake
/* Wake up all waiters to make sure no signal gets lost. */
2: testl %edi, %edi
jnz 5f
addl $cond_futex, %ebx
#if FUTEX_PRIVATE_FLAG > 255
xorl %ecx, %ecx
#endif
cmpl $-1, dep_mutex-cond_futex(%ebx)
sete %cl
subl $1, %ecx
#ifdef __ASSUME_PRIVATE_FUTEX
andl $FUTEX_PRIVATE_FLAG, %ecx
#else
andl %gs:PRIVATE_FUTEX, %ecx
#endif
addl $FUTEX_WAKE, %ecx
movl $SYS_futex, %eax
movl $0x7fffffff, %edx
ENTER_KERNEL
5: movl 20+FRAME_SIZE(%esp), %eax
call __pthread_mutex_cond_lock
movl %esi, (%esp)
.LcallUR:
call _Unwind_Resume
hlt
.LENDCODE:
.size __condvar_w_cleanup, .-__condvar_w_cleanup
.section .gcc_except_table,"a",@progbits
.LexceptSTART:
.byte 0xff # @LPStart format (omit)
.byte 0xff # @TType format (omit)
.byte 0x0b # call-site format
# DW_EH_PE_sdata4
.uleb128 .Lcstend-.Lcstbegin
.Lcstbegin:
.long .LcleanupSTART-.LSTARTCODE
.long .Ladd_cond_futex-.LcleanupSTART
.long __condvar_w_cleanup-.LSTARTCODE
.uleb128 0
.long .Ladd_cond_futex-.LSTARTCODE
.long .Lsub_cond_futex-.Ladd_cond_futex
.long __condvar_w_cleanup2-.LSTARTCODE
.uleb128 0
.long .Lsub_cond_futex-.LSTARTCODE
.long .LcleanupEND-.Lsub_cond_futex
.long __condvar_w_cleanup-.LSTARTCODE
.uleb128 0
.long .LcallUR-.LSTARTCODE
.long .LENDCODE-.LcallUR
.long 0
.uleb128 0
.Lcstend:
.section .eh_frame,"a",@progbits
.LSTARTFRAME:
.long L(ENDCIE)-L(STARTCIE) # 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 -4 # Data alignment factor.
.byte 8 # 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 6 # Augmentation value length.
.byte 0x0 # Personality: absolute
.long __gcc_personality_v0
.byte 0x0 # LSDA Encoding: absolute
#endif
.byte 0x0c # DW_CFA_def_cfa
.uleb128 4
.uleb128 4
.byte 0x88 # DW_CFA_offset, column 0x8
.uleb128 1
.align 4
.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.
#else
.long .LSTARTCODE # Start address of the code.
#endif
.long .LENDCODE-.LSTARTCODE # Length of the code.
.uleb128 4 # Augmentation size
#ifdef SHARED
.long .LexceptSTART-.
#else
.long .LexceptSTART
#endif
.byte 0x40+.Lpush_edi-.LSTARTCODE # DW_CFA_advance_loc+N
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 8
.byte 0x87 # DW_CFA_offset %edi
.uleb128 2
.byte 0x40+.Lpush_esi-.Lpush_edi # DW_CFA_advance_loc+N
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 12
.byte 0x86 # DW_CFA_offset %esi
.uleb128 3
.byte 0x40+.Lpush_ebx-.Lpush_esi # DW_CFA_advance_loc+N
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 0x83 # DW_CFA_offset %ebx
.uleb128 4
.byte 4 # DW_CFA_advance_loc4
.4byte .Lsubl-.Lpush_ebx
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16+FRAME_SIZE
.byte 4 # DW_CFA_advance_loc4
.4byte .Laddl-.Lsubl
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 0x40+ .Lpop_ebx-.Laddl # DW_CFA_advance_loc+N
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 12
.byte 0xc3 # DW_CFA_restore %ebx
.byte 0x40+.Lpop_esi-.Lpop_ebx # DW_CFA_advance_loc+N
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 8
.byte 0xc6 # DW_CFA_restore %esi
.byte 0x40+.Lpop_edi-.Lpop_esi # DW_CFA_advance_loc+N
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 4
.byte 0xc7 # DW_CFA_restore %edi
.byte 0x40+.LSbl1-.Lpop_edi # DW_CFA_advance_loc+N
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 0x87 # DW_CFA_offset %edi
.uleb128 2
.byte 0x86 # DW_CFA_offset %esi
.uleb128 3
.byte 0x83 # DW_CFA_offset %ebx
.uleb128 4
.byte 4 # DW_CFA_advance_loc4
.4byte .LSbl2-.LSbl1
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16+FRAME_SIZE
.byte 4 # DW_CFA_advance_loc4
.4byte .LSbl3-.LSbl2
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 4 # DW_CFA_advance_loc4
.4byte .LSbl4-.LSbl3
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16+FRAME_SIZE
.align 4
.LENDFDE:
#ifdef PIC
.section .gnu.linkonce.t.__i686.get_pc_thunk.cx,"ax",@progbits
.globl __i686.get_pc_thunk.cx
.hidden __i686.get_pc_thunk.cx
.type __i686.get_pc_thunk.cx,@function
__i686.get_pc_thunk.cx:
movl (%esp), %ecx;
ret
.size __i686.get_pc_thunk.cx,.-__i686.get_pc_thunk.cx
#endif
#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 4
.type DW.ref.__gcc_personality_v0, @object
.size DW.ref.__gcc_personality_v0, 4
DW.ref.__gcc_personality_v0:
.long __gcc_personality_v0
#endif
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