soft and program: comp.programming.threads - 7 new messages in 5 topics

comp.programming.threads
http://groups.google.com/group/comp.programming.threads?hl=en

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Today's topics:

* Library requirement for mutex destroy - 1 messages, 1 author
http://groups.google.com/group/comp.programming.threads/t/4a94e9df8d2f3e22?hl=en
* www.brandtrade08.cn ) wholesale DSQUARED T-shirt men's - 2 messages, 2
authors
http://groups.google.com/group/comp.programming.threads/t/caff128cdcf912db?hl=en
* fashion watches ( paypal payment - 2 messages, 2 authors
http://groups.google.com/group/comp.programming.threads/t/f301832a08ade816?hl=en
* Buying+sell+rent+Real+Estate+plots+bangloaws Gulshan Johar Dha Clifton North-
Nazimabad in all Karachi+Lahore+Islamabad+others+cityes - 1 messages, 1 author
http://groups.google.com/group/comp.programming.threads/t/cfc61eb0ce87058c?hl=en
* HELP - 1 messages, 1 author
http://groups.google.com/group/comp.programming.threads/t/a863d4f1119976f8?hl=en

==============================================================================
TOPIC: Library requirement for mutex destroy
http://groups.google.com/group/comp.programming.threads/t/4a94e9df8d2f3e22?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Oct 30 2009 8:27 pm
From: frege

On Oct 28, 9:27 am, Noob <r...@127.0.0.1> wrote:
> [ Cross-posted to c.p.t and c.u.p ]
>
> Hello,
>
> I'm using a proprietary library (no source code) which requires the user
> to provide 4 mutex-related functions (create, delete, lock, unlock).
>
> AFAICT, if I were using a POSIX OS, I could make trivial wrappers around
>
> pthread_mutex_init
> pthread_mutex_destroy
> pthread_mutex_lock
> pthread_mutex_unlock
>
> But this library has specific requirements for the delete function:
>
> If delete is called on a locked mutex, the function must return an error
> code to signal the error to the function's caller.
>
> However, the documentation for pthread_mutex_destroy explicitly states:http://www.opengroup.org/onlinepubs/009695399/functions/pthread_mutex...
>
> """
> It shall be safe to destroy an initialized mutex that is unlocked.
> Attempting to destroy a locked mutex results in undefined behavior.
> """
>
> This means that my delete function can't just call pthread_mutex_destroy
> because I would invoke UB if the mutex is locked, and I wouldn't be able
> to return the requested error code, right?
>
> So... Does this mean I have to keep track whether the mutex is locked?
> (It would appear so.)
>
> Or perhaps I could mess with the OS code? (shudder)
>
> I'd like to tell the library author that it is unreasonable to impose
> overhead on every lock and unlock operation just to catch an obvious (?)
> programming error on delete. What do you think?
>
> N.B. the library requires mutex with recursive semantic.
>
> Regards.

I basically agree with everyone else - the specs are stupid. But my 2
cents anyhow:

1. just don't implement it, but say you did. ie have delete never
return an error. The error would only ever been seen in broken code
anyhow.

2. ref count it:

class ByTheSpecMutex
{
boost::shared_ptr<RealMutex> pmutex;
public:
error_code delete()
{
if (pmutex->count() > 1)
return in_use_error;
...
}
};

Tony

==============================================================================
TOPIC: www.brandtrade08.cn ) wholesale DSQUARED T-shirt men's
http://groups.google.com/group/comp.programming.threads/t/caff128cdcf912db?hl=en
==============================================================================

== 1 of 2 ==
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== 2 of 2 ==
Date: Sat, Oct 31 2009 5:26 am
From: Lennart

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==============================================================================
TOPIC: fashion watches ( paypal payment
http://groups.google.com/group/comp.programming.threads/t/f301832a08ade816?hl=en
==============================================================================

== 1 of 2 ==
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== 2 of 2 ==
Date: Sat, Oct 31 2009 5:28 am
From: Lennart

On 31 Okt, 11:41, sneaer <banshi...@163.com> wrote:

==============================================================================
TOPIC: Buying+sell+rent+Real+Estate+plots+bangloaws Gulshan Johar Dha Clifton
North-Nazimabad in all Karachi+Lahore+Islamabad+others+cityes
http://groups.google.com/group/comp.programming.threads/t/cfc61eb0ce87058c?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Oct 31 2009 12:20 pm
From: iqbal

Buying+sell+rent+Real+Estate+plots+bangloaws Gulshan Johar Dha Clifton
North-Nazimabad in all Karachi+Lahore+Islamabad+others+cityes
http://guest-houses-5star-hotels-karachi.blogspot.com

==============================================================================
TOPIC: HELP
http://groups.google.com/group/comp.programming.threads/t/a863d4f1119976f8?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Oct 31 2009 1:23 pm
From: kennethadammiller

For those that want to say that I ask to much rather than look things
up myself... well, sorry. I've researched really hard, but I feel
like the information is between the lines, and I need someone who
knows. It will be much harder to go research this without asking
somebody, costly in time that is. And besides that's what these groups
are for right?

Before my 9.10 install, which went well, I was using an old version of
eclipse that I had added from the add/remove to make some programs. I
needed Visual Editor to make some things and when I tried to install
it, it kept giving me some null pointer exception or pointer not found
exception. I had to go post an error log and get on ubuntu irc channel
to find out that I need to be using a different Virtual machine for
eclipse and that I needed to update eclipse. well I upgraded my distro
and found that when I added eclipse from the add/remove, it wouldn't
let me add the visual editor either. I removed it and then added it to
my system following these instructions-
http://johnpaulett.com/2009/06/26/install-eclipse-galileo-3-5-on-ubuntu-jaunty/
So i left VE alone and started to import my old source files, and I
kept getting some error any time I tried to test run that I couldn't
find the main class. I tried copying everything from the workspace to
my desktop to back it up, so I could systematically delete the
projects and recreate them. This still kept coming up with errors.

Through all of this I am facing numerous related issues. I really need
advice.

Things I would like answered from curiousity...
Should I even still use eclipse?
why did the people who manage the add/remove not update the eclipse
thing to say something or have a recent edition? (and who manages the
add/remove in the first place?)
why is there more than one type of VM?
What is the difference between J2SE and J2EE? (i know what the letters
stand for...)

The most important part though is the issues:

I still need VE for eclipse. it won't add. I don't know why.
Sometimes when I click a button, in any dialog of eclipse (the actual
editor's dialog panes that is), the buttons go down, but do nothing.
this is causing a lot of problems
How do I install the VM that is compatible with eclipse? If I do this,
what will happen to the one that netbeans uses, if I should decide to
use netbeans?

Guys thanks a lot.

And anyone that wants to can check out my program when I'm finished.
it's going to be really cool :):)
I'm nearly done, as soon as I get these problems out of the way, I can
get back to work on it. Thanks in advance, and let me know if you're
interested.
Program information: http://uberprogrammer.blogspot.com/2009/10/project-dirscourrec.html

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