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|
/* Copyright (C) 2002-2005, 2007, 2009 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 <lowlevelcond.h>
#include <pthread-pi-defines.h>
#include <pthread-errnos.h>
#include <bits/kernel-features.h>
#include <tcb-offsets.h>
/* For the calculation see asm/vsyscall.h. */
#define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000
.text
/* int pthread_cond_timedwait (pthread_cond_t *cond, pthread_mutex_t *mutex,
const struct timespec *abstime) */
.globl __pthread_cond_timedwait
.type __pthread_cond_timedwait, @function
.hidden __pthread_cond_timedwait
.align 16
__pthread_cond_timedwait:
.LSTARTCODE:
cfi_startproc
pushq %r12
cfi_adjust_cfa_offset(8)
cfi_rel_offset(%r12, 0)
pushq %r13
cfi_adjust_cfa_offset(8)
cfi_rel_offset(%r13, 0)
pushq %r14
cfi_adjust_cfa_offset(8)
cfi_rel_offset(%r14, 0)
pushq %r15
cfi_adjust_cfa_offset(8)
cfi_rel_offset(%r15, 0)
#ifdef __ASSUME_FUTEX_CLOCK_REALTIME
# define FRAME_SIZE 32
#else
# define FRAME_SIZE 48
#endif
subq $FRAME_SIZE, %rsp
cfi_adjust_cfa_offset(FRAME_SIZE)
cfi_remember_state
cmpq $1000000000, 8(%rdx)
movl $EINVAL, %eax
jae 48f
/* Stack frame:
rsp + 48
+--------------------------+
rsp + 32 | timeout value |
+--------------------------+
rsp + 24 | old wake_seq value |
+--------------------------+
rsp + 16 | mutex pointer |
+--------------------------+
rsp + 8 | condvar pointer |
+--------------------------+
rsp + 4 | old broadcast_seq value |
+--------------------------+
rsp + 0 | old cancellation mode |
+--------------------------+
*/
cmpq $-1, dep_mutex(%rdi)
/* Prepare structure passed to cancellation handler. */
movq %rdi, 8(%rsp)
movq %rsi, 16(%rsp)
movq %rdx, %r13
je 22f
movq %rsi, dep_mutex(%rdi)
22:
#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
# ifdef __PIC__
cmpl $0, __have_futex_clock_realtime(%rip)
# else
cmpl $0, __have_futex_clock_realtime
# endif
je .Lreltmo
#endif
/* Get internal lock. */
movl $1, %esi
xorl %eax, %eax
LOCK
#if cond_lock == 0
cmpxchgl %esi, (%rdi)
#else
cmpxchgl %esi, cond_lock(%rdi)
#endif
jnz 31f
/* Unlock the mutex. */
32: movq 16(%rsp), %rdi
xorl %esi, %esi
callq __pthread_mutex_unlock_usercnt
testl %eax, %eax
jne 46f
movq 8(%rsp), %rdi
incq total_seq(%rdi)
incl cond_futex(%rdi)
addl $(1 << nwaiters_shift), cond_nwaiters(%rdi)
/* Get and store current wakeup_seq value. */
movq 8(%rsp), %rdi
movq wakeup_seq(%rdi), %r9
movl broadcast_seq(%rdi), %edx
movq %r9, 24(%rsp)
movl %edx, 4(%rsp)
38: movl cond_futex(%rdi), %r12d
/* Unlock. */
LOCK
#if cond_lock == 0
decl (%rdi)
#else
decl cond_lock(%rdi)
#endif
jne 33f
.LcleanupSTART1:
34: callq __pthread_enable_asynccancel
movl %eax, (%rsp)
movq %r13, %r10
movl $FUTEX_WAIT_BITSET, %esi
cmpq $-1, dep_mutex(%rdi)
je 60f
movq dep_mutex(%rdi), %r8
/* Requeue to a non-robust PI mutex if the PI bit is set and
the robust bit is not set. */
movl MUTEX_KIND(%r8), %eax
andl $(ROBUST_BIT|PI_BIT), %eax
cmpl $PI_BIT, %eax
jne 61f
movl $(FUTEX_WAIT_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %esi
xorl %eax, %eax
/* The following only works like this because we only support
two clocks, represented using a single bit. */
testl $1, cond_nwaiters(%rdi)
movl $FUTEX_CLOCK_REALTIME, %edx
cmove %edx, %eax
orl %eax, %esi
movq %r12, %rdx
addq $cond_futex, %rdi
movl $SYS_futex, %eax
syscall
movl $1, %r15d
#ifdef __ASSUME_REQUEUE_PI
jmp 62f
#else
cmpq $-4095, %rax
jnae 62f
subq $cond_futex, %rdi
#endif
61: movl $(FUTEX_WAIT_BITSET|FUTEX_PRIVATE_FLAG), %esi
60: xorl %r15d, %r15d
xorl %eax, %eax
/* The following only works like this because we only support
two clocks, represented using a single bit. */
testl $1, cond_nwaiters(%rdi)
movl $FUTEX_CLOCK_REALTIME, %edx
movl $0xffffffff, %r9d
cmove %edx, %eax
orl %eax, %esi
movq %r12, %rdx
addq $cond_futex, %rdi
movl $SYS_futex, %eax
syscall
62: movq %rax, %r14
movl (%rsp), %edi
callq __pthread_disable_asynccancel
.LcleanupEND1:
/* Lock. */
movq 8(%rsp), %rdi
movl $1, %esi
xorl %eax, %eax
LOCK
#if cond_lock == 0
cmpxchgl %esi, (%rdi)
#else
cmpxchgl %esi, cond_lock(%rdi)
#endif
jne 35f
36: movl broadcast_seq(%rdi), %edx
movq woken_seq(%rdi), %rax
movq wakeup_seq(%rdi), %r9
cmpl 4(%rsp), %edx
jne 53f
cmpq 24(%rsp), %r9
jbe 45f
cmpq %rax, %r9
ja 39f
45: cmpq $-ETIMEDOUT, %r14
jne 38b
99: incq wakeup_seq(%rdi)
incl cond_futex(%rdi)
movl $ETIMEDOUT, %r14d
jmp 44f
53: xorq %r14, %r14
jmp 54f
39: xorq %r14, %r14
44: incq woken_seq(%rdi)
54: subl $(1 << nwaiters_shift), cond_nwaiters(%rdi)
/* Wake up a thread which wants to destroy the condvar object. */
cmpq $0xffffffffffffffff, total_seq(%rdi)
jne 55f
movl cond_nwaiters(%rdi), %eax
andl $~((1 << nwaiters_shift) - 1), %eax
jne 55f
addq $cond_nwaiters, %rdi
cmpq $-1, dep_mutex-cond_nwaiters(%rdi)
movl $1, %edx
#ifdef __ASSUME_PRIVATE_FUTEX
movl $FUTEX_WAKE, %eax
movl $(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), %esi
cmove %eax, %esi
#else
movl $0, %eax
movl %fs:PRIVATE_FUTEX, %esi
cmove %eax, %esi
orl $FUTEX_WAKE, %esi
#endif
movl $SYS_futex, %eax
syscall
subq $cond_nwaiters, %rdi
55: LOCK
#if cond_lock == 0
decl (%rdi)
#else
decl cond_lock(%rdi)
#endif
jne 40f
/* If requeue_pi is used the kernel performs the locking of the
mutex. */
41: movq 16(%rsp), %rdi
testl %r15d, %r15d
jnz 64f
callq __pthread_mutex_cond_lock
63: testq %rax, %rax
cmoveq %r14, %rax
48: addq $FRAME_SIZE, %rsp
cfi_adjust_cfa_offset(-FRAME_SIZE)
popq %r15
cfi_adjust_cfa_offset(-8)
cfi_restore(%r15)
popq %r14
cfi_adjust_cfa_offset(-8)
cfi_restore(%r14)
popq %r13
cfi_adjust_cfa_offset(-8)
cfi_restore(%r13)
popq %r12
cfi_adjust_cfa_offset(-8)
cfi_restore(%r12)
retq
cfi_restore_state
64: callq __pthread_mutex_cond_lock_adjust
movq %r14, %rax
jmp 48b
/* Initial locking failed. */
31:
#if cond_lock != 0
addq $cond_lock, %rdi
#endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_lock_wait
jmp 32b
/* Unlock in loop requires wakeup. */
33:
#if cond_lock != 0
addq $cond_lock, %rdi
#endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_unlock_wake
jmp 34b
/* Locking in loop failed. */
35:
#if cond_lock != 0
addq $cond_lock, %rdi
#endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_lock_wait
#if cond_lock != 0
subq $cond_lock, %rdi
#endif
jmp 36b
/* Unlock after loop requires wakeup. */
40:
#if cond_lock != 0
addq $cond_lock, %rdi
#endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_unlock_wake
jmp 41b
/* The initial unlocking of the mutex failed. */
46: movq 8(%rsp), %rdi
movq %rax, (%rsp)
LOCK
#if cond_lock == 0
decl (%rdi)
#else
decl cond_lock(%rdi)
#endif
jne 47f
#if cond_lock != 0
addq $cond_lock, %rdi
#endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_unlock_wake
47: movq (%rsp), %rax
jmp 48b
#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
.Lreltmo:
xorl %r15d, %r15d
/* Get internal lock. */
movl $1, %esi
xorl %eax, %eax
LOCK
# if cond_lock == 0
cmpxchgl %esi, (%rdi)
# else
cmpxchgl %esi, cond_lock(%rdi)
# endif
jnz 1f
/* Unlock the mutex. */
2: movq 16(%rsp), %rdi
xorl %esi, %esi
callq __pthread_mutex_unlock_usercnt
testl %eax, %eax
jne 46b
movq 8(%rsp), %rdi
incq total_seq(%rdi)
incl cond_futex(%rdi)
addl $(1 << nwaiters_shift), cond_nwaiters(%rdi)
/* Get and store current wakeup_seq value. */
movq 8(%rsp), %rdi
movq wakeup_seq(%rdi), %r9
movl broadcast_seq(%rdi), %edx
movq %r9, 24(%rsp)
movl %edx, 4(%rsp)
/* Get the current time. */
8:
# ifdef __NR_clock_gettime
/* Get the clock number. Note that the field in the condvar
structure stores the number minus 1. */
movq 8(%rsp), %rdi
movl cond_nwaiters(%rdi), %edi
andl $((1 << nwaiters_shift) - 1), %edi
/* Only clocks 0 and 1 are allowed so far. Both are handled in the
kernel. */
leaq 32(%rsp), %rsi
# ifdef SHARED
movq __vdso_clock_gettime@GOTPCREL(%rip), %rax
movq (%rax), %rax
PTR_DEMANGLE (%rax)
jz 26f
call *%rax
jmp 27f
# endif
26: movl $__NR_clock_gettime, %eax
syscall
27:
# ifndef __ASSUME_POSIX_TIMERS
cmpq $-ENOSYS, %rax
je 19f
# endif
/* Compute relative timeout. */
movq (%r13), %rcx
movq 8(%r13), %rdx
subq 32(%rsp), %rcx
subq 40(%rsp), %rdx
# else
leaq 24(%rsp), %rdi
xorl %esi, %esi
movq $VSYSCALL_ADDR_vgettimeofday, %rax
callq *%rax
/* Compute relative timeout. */
movq 40(%rsp), %rax
movl $1000, %edx
mul %rdx /* Milli seconds to nano seconds. */
movq (%r13), %rcx
movq 8(%r13), %rdx
subq 32(%rsp), %rcx
subq %rax, %rdx
# endif
jns 12f
addq $1000000000, %rdx
decq %rcx
12: testq %rcx, %rcx
movq 8(%rsp), %rdi
movq $-ETIMEDOUT, %r14
js 6f
/* Store relative timeout. */
21: movq %rcx, 32(%rsp)
movq %rdx, 40(%rsp)
movl cond_futex(%rdi), %r12d
/* Unlock. */
LOCK
# if cond_lock == 0
decl (%rdi)
# else
decl cond_lock(%rdi)
# endif
jne 3f
.LcleanupSTART2:
4: callq __pthread_enable_asynccancel
movl %eax, (%rsp)
leaq 32(%rsp), %r10
cmpq $-1, dep_mutex(%rdi)
movq %r12, %rdx
# ifdef __ASSUME_PRIVATE_FUTEX
movl $FUTEX_WAIT, %eax
movl $(FUTEX_WAIT|FUTEX_PRIVATE_FLAG), %esi
cmove %eax, %esi
# else
movl $0, %eax
movl %fs:PRIVATE_FUTEX, %esi
cmove %eax, %esi
# if FUTEX_WAIT != 0
orl $FUTEX_WAIT, %esi
# endif
# endif
addq $cond_futex, %rdi
movl $SYS_futex, %eax
syscall
movq %rax, %r14
movl (%rsp), %edi
callq __pthread_disable_asynccancel
.LcleanupEND2:
/* Lock. */
movq 8(%rsp), %rdi
movl $1, %esi
xorl %eax, %eax
LOCK
# if cond_lock == 0
cmpxchgl %esi, (%rdi)
# else
cmpxchgl %esi, cond_lock(%rdi)
# endif
jne 5f
6: movl broadcast_seq(%rdi), %edx
movq woken_seq(%rdi), %rax
movq wakeup_seq(%rdi), %r9
cmpl 4(%rsp), %edx
jne 53b
cmpq 24(%rsp), %r9
jbe 15f
cmpq %rax, %r9
ja 39b
15: cmpq $-ETIMEDOUT, %r14
jne 8b
jmp 99b
/* Initial locking failed. */
1:
# if cond_lock != 0
addq $cond_lock, %rdi
# endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_lock_wait
jmp 2b
/* Unlock in loop requires wakeup. */
3:
# if cond_lock != 0
addq $cond_lock, %rdi
# endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_unlock_wake
jmp 4b
/* Locking in loop failed. */
5:
# if cond_lock != 0
addq $cond_lock, %rdi
# endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_lock_wait
# if cond_lock != 0
subq $cond_lock, %rdi
# endif
jmp 6b
# if defined __NR_clock_gettime && !defined __ASSUME_POSIX_TIMERS
/* clock_gettime not available. */
19: leaq 32(%rsp), %rdi
xorl %esi, %esi
movq $VSYSCALL_ADDR_vgettimeofday, %rax
callq *%rax
/* Compute relative timeout. */
movq 40(%rsp), %rax
movl $1000, %edx
mul %rdx /* Milli seconds to nano seconds. */
movq (%r13), %rcx
movq 8(%r13), %rdx
subq 32(%rsp), %rcx
subq %rax, %rdx
jns 20f
addq $1000000000, %rdx
decq %rcx
20: testq %rcx, %rcx
movq 8(%rsp), %rdi
movq $-ETIMEDOUT, %r14
js 6b
jmp 21b
# endif
#endif
.size __pthread_cond_timedwait, .-__pthread_cond_timedwait
weak_alias(__pthread_cond_timedwait, pthread_cond_timedwait)
.align 16
.type __condvar_cleanup2, @function
__condvar_cleanup2:
/* Stack frame:
rsp + 72
+--------------------------+
rsp + 64 | %r12 |
+--------------------------+
rsp + 56 | %r13 |
+--------------------------+
rsp + 48 | %r14 |
+--------------------------+
rsp + 24 | unused |
+--------------------------+
rsp + 16 | mutex pointer |
+--------------------------+
rsp + 8 | condvar pointer |
+--------------------------+
rsp + 4 | old broadcast_seq value |
+--------------------------+
rsp + 0 | old cancellation mode |
+--------------------------+
*/
movq %rax, 24(%rsp)
/* Get internal lock. */
movq 8(%rsp), %rdi
movl $1, %esi
xorl %eax, %eax
LOCK
#if cond_lock == 0
cmpxchgl %esi, (%rdi)
#else
cmpxchgl %esi, cond_lock(%rdi)
#endif
jz 1f
#if cond_lock != 0
addq $cond_lock, %rdi
#endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_lock_wait
#if cond_lock != 0
subq $cond_lock, %rdi
#endif
1: movl broadcast_seq(%rdi), %edx
cmpl 4(%rsp), %edx
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. */
movq total_seq(%rdi), %rax
cmpq wakeup_seq(%rdi), %rax
jbe 6f
incq wakeup_seq(%rdi)
incl cond_futex(%rdi)
6: incq woken_seq(%rdi)
3: subl $(1 << nwaiters_shift), cond_nwaiters(%rdi)
/* Wake up a thread which wants to destroy the condvar object. */
xorq %r12, %r12
cmpq $0xffffffffffffffff, total_seq(%rdi)
jne 4f
movl cond_nwaiters(%rdi), %eax
andl $~((1 << nwaiters_shift) - 1), %eax
jne 4f
cmpq $-1, dep_mutex(%rdi)
leaq cond_nwaiters(%rdi), %rdi
movl $1, %edx
#ifdef __ASSUME_PRIVATE_FUTEX
movl $FUTEX_WAKE, %eax
movl $(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), %esi
cmove %eax, %esi
#else
movl $0, %eax
movl %fs:PRIVATE_FUTEX, %esi
cmove %eax, %esi
orl $FUTEX_WAKE, %esi
#endif
movl $SYS_futex, %eax
syscall
subq $cond_nwaiters, %rdi
movl $1, %r12d
4: LOCK
#if cond_lock == 0
decl (%rdi)
#else
decl cond_lock(%rdi)
#endif
je 2f
#if cond_lock != 0
addq $cond_lock, %rdi
#endif
cmpq $-1, dep_mutex-cond_lock(%rdi)
movl $LLL_PRIVATE, %eax
movl $LLL_SHARED, %esi
cmovne %eax, %esi
callq __lll_unlock_wake
/* Wake up all waiters to make sure no signal gets lost. */
2: testq %r12, %r12
jnz 5f
addq $cond_futex, %rdi
cmpq $-1, dep_mutex-cond_futex(%rdi)
movl $0x7fffffff, %edx
#ifdef __ASSUME_PRIVATE_FUTEX
movl $FUTEX_WAKE, %eax
movl $(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), %esi
cmove %eax, %esi
#else
movl $0, %eax
movl %fs:PRIVATE_FUTEX, %esi
cmove %eax, %esi
orl $FUTEX_WAKE, %esi
#endif
movl $SYS_futex, %eax
syscall
5: movq 16(%rsp), %rdi
callq __pthread_mutex_cond_lock
movq 24(%rsp), %rdi
movq FRAME_SIZE(%rsp), %r15
movq FRAME_SIZE+8(%rsp), %r14
movq FRAME_SIZE+16(%rsp), %r13
movq FRAME_SIZE+24(%rsp), %r12
.LcallUR:
call _Unwind_Resume@PLT
hlt
.LENDCODE:
cfi_endproc
.size __condvar_cleanup2, .-__condvar_cleanup2
.section .gcc_except_table,"a",@progbits
.LexceptSTART:
.byte DW_EH_PE_omit # @LPStart format
.byte DW_EH_PE_omit # @TType format
.byte DW_EH_PE_uleb128 # call-site format
.uleb128 .Lcstend-.Lcstbegin
.Lcstbegin:
.uleb128 .LcleanupSTART1-.LSTARTCODE
.uleb128 .LcleanupEND1-.LcleanupSTART1
.uleb128 __condvar_cleanup2-.LSTARTCODE
.uleb128 0
#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
.uleb128 .LcleanupSTART2-.LSTARTCODE
.uleb128 .LcleanupEND2-.LcleanupSTART2
.uleb128 __condvar_cleanup2-.LSTARTCODE
.uleb128 0
#endif
.uleb128 .LcallUR-.LSTARTCODE
.uleb128 .LENDCODE-.LcallUR
.uleb128 0
.uleb128 0
.Lcstend:
#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, 8
DW.ref.__gcc_personality_v0:
.quad __gcc_personality_v0
#endif
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