Saturday, March 18, 2017

Digest for comp.lang.c++@googlegroups.com - 25 updates in 8 topics

kushal bhattacharya <bhattacharya.kushal4@gmail.com>: Mar 18 02:52AM -0700

Hi,
How do i get this group into the newsserver.PLease show me some sample example about this
jt@toerring.de (Jens Thoms Toerring): Mar 18 03:19PM

> How do i get this group into the newsserver.PLease show me some sample
> example about this
 
They (eternal september( already distribute comp.lang.c++.
All you need to do is to make your newsreader show it to
you - it probably is set up not to show it at the moment
like hundreds of other newsgroups that are available but
which you're rather likely not interested in. Perhaps
your newsreader has some option to show all avaialble
groups and then allows you to "subscribe" to some of
them.
 
--
\ Jens Thoms Toerring ___ jt@toerring.de
\__________________________ http://toerring.de
"Chris M. Thomasson" <invalid@invalid.invalid>: Mar 17 06:59PM -0700

On 3/17/2017 3:13 AM, kushal bhattacharya wrote:
> To be more clear i am doing his operation from differen threads and thus the deque is accessible to all the threads running simultaneously
 
How are you synchronizing access to the deque?
kushal bhattacharya <bhattacharya.kushal4@gmail.com>: Mar 17 09:53PM -0700

Hi,
Actually the code has several files .
If you want i can mail you all the files.
I can't really figure out which part exactly is the suspicious one.
I am synchronsing access using condtion variables notifying waiting thread when any modification is done on the deque and on the waiting thread i use that same condition variable with lock on it.
kushal bhattacharya <bhattacharya.kushal4@gmail.com>: Mar 17 10:03PM -0700

Hi,
Could you guys help me how do i detect the problematic area and post here?
kushal bhattacharya <bhattacharya.kushal4@gmail.com>: Mar 17 10:53PM -0700

When i try to remove a non existent element does it also cause undefined behaviour?
"Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com>: Mar 18 06:59AM +0100

On 18-Mar-17 6:03 AM, kushal bhattacharya wrote:
> Hi, Could you guys help me how do i detect the problematic area and
> post here?
 
Well, you have a bug somewhere, apparently (but that's only your
impression) connected to removal of items from a deque by multiple threads.
 
To fix a problem it's important to be able to reproduce it consistently,
but thread synchronization problems are notoriously difficult to reproduce.
 
So I suggest that you /isolate/ the deque. Place it as a private member
of a class. Define access methods that always lock it via mutex.
 
If the problem persists, then /if/ it's connected to the deque it's
probably because some thread retains a reference to something in the deque.
 
This is more difficult to hunt down, but the solution then is probably a
bit of indirection, to deal with the real shared ownership
(contradicting the assumption of central ownership in the deque). One
approach then is to not let your wrapper hand out raw references or
pointers to data in the deque. Hand out shared_ptr's.
 
And you can do the same with the items as with the deque: isolate them,
by placing them in thread safe wrappers.
 
You can also attack this from the opposite end.
 
Namely, try to build up a simplest possible example that exhibits the
ungood behavior.
 
In the end, when no reasonable approach has worked, if that should
happen, then just find some totally different way of doing whatever it
is that needs to be done.
 
 
Cheers & hth.,
 
- Alf
kushal bhattacharya <bhattacharya.kushal4@gmail.com>: Mar 17 11:24PM -0700

Hi Alf,
I am globally accessing the deque in different classes instances so thats why i have kept it globally.Is it a wise choice or do I have
to wrap it within some class?
Ian Collins <ian-news@hotmail.com>: Mar 18 07:33PM +1300

On 03/18/17 07:24 PM, kushal bhattacharya wrote:
> Hi Alf, I am globally accessing the deque in different classes
> instances so thats why i have kept it globally.Is it a wise choice or
> do I have to wrap it within some class?
 
Please try and reply (with context) to the message you are responding to
rather than keep replying to yourself! That will make it easier for
people to help you..
 
--
Ian
kushal bhattacharya <bhattacharya.kushal4@gmail.com>: Mar 18 12:50AM -0700

I apologise if i have been wrong actually i was trying to be more clear .Actually now i am getting seg fault in my manipulation of deque
Christian Gollwitzer <auriocus@gmx.de>: Mar 18 09:00AM +0100

Am 18.03.17 um 06:59 schrieb Alf P. Steinbach:
> impression) connected to removal of items from a deque by multiple threads.
 
> To fix a problem it's important to be able to reproduce it consistently,
> but thread synchronization problems are notoriously difficult to reproduce.
 
Fortunately, there are tools which can help. If you can run your program
on Linux, you can use Valgrind to check it for memory errors and
Helgrind to find synchronization errors. These are two of the best
debugging tools I've ever used.
 
Christian
Paavo Helde <myfirstname@osa.pri.ee>: Mar 18 10:47AM +0200

On 18.03.2017 7:03, kushal bhattacharya wrote:
> Hi,
> Could you guys help me how do i detect the problematic area and post here?
 
Multithreading bugs are difficult to debug. One simple approach is to
inspect the code carefully to verify that the multithread locking code
is correct. This is very simple: do a text search over all your files
for the name of the global deque. Go through the *ALL* locations where
the deque is accessed and verify that there is the proper lock variable
defined in an enclosing scope (and that it is not a declaration of a
function, that it is locking the same global mutex, etc.)
 
And please learn to reply in the correct subthread and to quote the
relevant context! Using a proper newsreader like Thunderbird instead of
Google Groups might be of some help.
Jerry Stuckle <jstucklex@attglobal.net>: Mar 18 10:31AM -0400

On 3/18/2017 3:50 AM, kushal bhattacharya wrote:
> I apologise if i have been wrong actually i was trying to be more clear .Actually now i am getting seg fault in my manipulation of deque
 
You can't just lock the deque during the removal process. Removing an
element can cause any pointer or iterator in other threads to become
invalid. This will cause undefined results (including potential segfaults).
 
--
==================
Remove the "x" from my email address
Jerry Stuckle
jstucklex@attglobal.net
==================
"Öö Tiib" <ootiib@hot.ee>: Mar 17 04:31PM -0700

On Friday, 17 March 2017 20:32:40 UTC+2, David Brown wrote:
> On 17/03/17 18:24, Mr Flibble wrote:
> I think most people
> find Rick's religious posts annoying, but not offensive.
 
About as non-offensive as would be shitting into well from what other
people drink.
kushal bhattacharya <bhattacharya.kushal4@gmail.com>: Mar 17 09:56PM -0700

Thanks a lot David.
I think I have thunderbird installed in my ubuntu os.
I will try to google it and try to setup now.
wij@totalbb.net.tw: Mar 18 05:30AM -0700

On Friday, March 17, 2017 at 9:33:39 PM UTC+8, Rick C. Hodgin wrote:
> God's judgment remains upon you.
 
> Thank you,
> Rick C. Hodgin
 
Well said. I do believe you have your reason to preach, can't help thinking
what kind of sin really down there in your soul (hope not offensive, i have
no religion).
"Rick C. Hodgin" <rick.c.hodgin@gmail.com>: Mar 18 06:14AM -0700

> ...can't help thinking
> what kind of sin really down there in your soul...
 
I am like everyone else. I have sinned in my life. Some big sins.
Some little sins. But before a "Holy, Holy, Holy" God, they are all
equal. To God, sin is sin and is unacceptable in a universe created
in truth, founded on truth, and enduring in truth. To such a creation,
falseness is a cancer that only destroys:
 
http://biblehub.com/james/2-10.htm
10 For whosoever shall keep the whole law, and yet offend in one
point, he is guilty of all.
 
We are all guilty before God. It's why I point you all to Jesus. He
has the authority and desire to forgive your sin and give you eternal
life. He doesn't want to judge anyone. But, because of our sin, if
we do not accept His free offer of forgiveness and salvation, He will.
 
I need Jesus. I am no different than anyone else. I have Jesus now
in my life, and I know the freedom He affords from sin, and a re-
polarization of my internal driving forces so that I no longer want
to sin. He did that for me. I did not achieve something on my own.
 
I came to Him acknowledging that I was a sinner, repenting of my sin,
not wanting it, and He made it possible for me to stop sinning. Of
course I still stumble from time to time. I make mistakes. I'm in
no way perfect. I am a flawed person in this body, but my spirit
seeks God rightly and I desire to be more than my flaws, and He makes
it possible for me. It's not me doing on my own. It's Him in my
life making it possible.
 
He can do the same for each of you. He wants to do the same for each
of you. I point you to Him so you can come to Him and ask forgiveness
for your sin and be saved as well. He will work on straightening out
your life the same as He did my life. And, in the process, you too
will encounter an unending slew of people who come at you saying in
vulgarity and profanity that those things you do leading them to life
and life eternal are the equivalent of defalcating in public water
sources. What kind of twisted thinking is that, that the one pointing
people to forgiveness, life, and life eternal, is the same as doing
some heinous act? It is only the one who has not yet heard the call
of Christ in their heart, for when they do they too will see the error
of their ways, and their attack on men and women like me who have done
nothing more than lead them to Jesus Christ so they too could be saved.
 
-----
I have sin. I need a savior. Jesus is my savior. And now I have
eternal life. He will do the same for you ... if you ask Him.
 
Thank you,
Rick C. Hodgin
"Rick C. Hodgin" <rick.c.hodgin@gmail.com>: Mar 18 06:26AM -0700

On Saturday, March 18, 2017 at 9:14:33 AM UTC-4, Rick C. Hodgin wrote:
> your life the same as He did my life. And, in the process, you too
> will encounter an unending slew of people who come at you saying in
> vulgarity and profanity that those things you do leading them to life
 
Should be "defecating." I clicked on the wrong spell-checker word as
I didn't know how to spell "deficating" (in my thinking). :-) I didn't
even know defalcating was a word. It means embezzlement of public
funds apparently.
 
 
> -----
> I have sin. I need a savior. Jesus is my savior. And now I have
> eternal life. He will do the same for you ... if you ask Him.
 
It's not offensive to teach people about Jesus. It's what He calls us
to do. It is offensive to not receive it. It's not offensive to me,
but it is offense of one's self, and to the God who paid the price to
make a way for you to be set free. It is offensive to that offering
of unparalleled love and compassion for you in your life. This is not
like forgiveness of a monetary debt. This is eternal life in the form
God originally created you to be, and intended for you to be, before
sin entered into the world and created this fallen world of death,
disease, war and loss that we see. It's not supposed to be like this,
and Jesus is the path back to what it's supposed to be like:
 
What will Heaven be like?
 
http://biblehub.com/kjv/revelation/22.htm
1 And he shewed me a pure river of water of life, clear as crystal,
proceeding out of the throne of God and of the Lamb.
2 In the midst of the street of it, and on either side of the river,
was there the tree of life, which bare twelve manner of fruits,
and yielded her fruit every month: and the leaves of the tree were
for the healing of the nations.
3 And there shall be no more curse: but the throne of God and of the
Lamb shall be in it; and his servants shall serve him:
4 And they shall see his face; and his name shall be in their
foreheads.
5 And there shall be no night there; and they need no candle,
neither light of the sun; for the Lord God giveth them light:
and they shall reign for ever and ever.
 
Nobody knows the explicit details. But Jesus Himself described it as
paradise:
 
http://biblehub.com/luke/23-43.htm
43 And Jesus said unto him, Verily I say unto thee, To day shalt
thou be with me in paradise.
 
To put it in modern terms: It's better than the Nexus from Star Trek.
And it's available to everybody. Nobody has to perish. Everyone can
be saved. What Jesus did at the cross was sufficient to save ALL
people WORLDWIDE. It is only us (we ourselves by our choice) who will
reject Him. He calls out to all people to come to Him and be saved,
to be a part of His eternal Kingdom.
 
Thank you,
Rick C. Hodgin
bitrex <bitrex@de.lete.earthlink.net>: Mar 18 10:11AM -0400

On 03/18/2017 09:14 AM, Rick C. Hodgin wrote:
 
> seeks God rightly and I desire to be more than my flaws, and He makes
> it possible for me. It's not me doing on my own. It's Him in my
> life making it possible.
 
The difficulty with "Honor thy father and mother" is that unfortunately,
not all parents actually love their children (at least not in the way
"normal" people would conceptualize it.) Sadly, some seem to have been
born without the equipment to do so, and yet they often have children
regardless.
 
For example:
 
<https://en.wikipedia.org/wiki/Cluster_B_personality_disorders>
 
Even psychopaths have children from time to time. In what way should a
child "honor" a psychopath?
fir <profesor.fir@gmail.com>: Mar 18 03:53AM -0700

W dniu sobota, 18 marca 2017 00:26:23 UTC+1 użytkownik Öö Tiib napisał:
> missing for me. Why does Rick C. Hodgin shit into drinking well?
> Why does Amine Moulay Ramdane? It is proof that here exists no God.
> It can't be that some God made such pointless, annoying people.
 
it is becouse they are abusers and idiots (being idiots they not take intellectual points and being abusers they need force-based treatment ) -- the fault is also on google side speaking on google groups as they are known to not answering on abuse raports
(this is all ofc not about censorship and cutting down variety of attitudes and opinions but on massive bulk spam (all ramine, hodgin, elmo and yet czang are spammers/ idiot-abusers)
"Rick C. Hodgin" <rick.c.hodgin@gmail.com>: Mar 18 05:07AM -0700

Why don't you understand why I post about Jesus? It's because
you are not being saved:
 
http://biblehub.com/1_corinthians/1-18.htm
 
18 For the preaching of the cross is to them that perish foolishness;
but unto us which are saved it is the power of God.
 
I guide you to Jesus because I care about you. I want you to be
forgiven for your sin and be saved. I want you to be alive in
Heaven with God in His Kingdom of paradise. I want the absolute
best for your future.
 
Thank you,
Rick C. Hodgin
Gareth Owen <gwowen@gmail.com>: Mar 18 06:02AM


> Colour emojis implemented in "neoGFX" my C++ GUI/game library:
 
> http://neogfx.org/temp/emoji.png
 
Looks very nice.
Ramine <toto@toto.net>: Mar 17 07:56PM -0400

Hello,
 
 
Here is how to understand C++ compilers..
 
I have written this, read it carefully:
 
====
C++ compilers today follow a weak memory model and this is error prone
when you want to reason about sequential consistency when doing parallel
programming.
 
But Delphi and FreePascal compilers don't reorder loads and stores,
so it is less error prone than C++ on a strong memory model of x86
architecture and on strong memory model of ARM architecture.
 
This is why i am using Delphi and Freepascal Dynamic Link Libraries
from C++ compilers.
===
 
 
Now you have understood the philosophy of C and C++ compilers,
it's that they give much more priviledge to speed than to security, they
look like assembler compilers in this regard, this is why they follow a
weak memory model that is more error prone than Delphi and FreePascal
compilers.
 
 
Thank you,
Amine Moulay Ramdane.
Ramine <toto@toto.net>: Mar 17 07:37PM -0400

Hello,
 
 
C++ compilers today follow a weak memory model and this is error prone
when you want to reason about sequential consistency when doing parallel
programming.
 
But Delphi and FreePascal compilers don't reorder loads and stores,
so it is less error prone than C++ on a strong memory model of x86
architecture and on strong memory model of ARM architecture.
 
This is why i am using Delphi and Freepascal Dynamic Link Libraries
from C++ compilers.
 
 
Thank you,
Amine Moulay Ramdane.
Ramine <toto@toto.net>: Mar 17 07:34PM -0400

Hello,
 
 
C++ compilers today follow a weak memory model and this is error prone
when you want to reason about sequential consistency when doing parallel
programming.
 
But Delphi and FreePascal compilers don't reorder loads and stores,
so it os less error prone than C++ on a strong memory model of x86
architecture and on strong memory model of ARM architecture.
 
This is why i am using Delphi and Freepascal Dynamic Link Libraries
from C++ compilers.
 
 
Thank you,
Amine Moulay Ramdane.
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