child thread question

[QQ]

Hi I am writing a multithreads program.
I have a variable in the main thread,
can I use it at the child thread?
For example I have a count in main,
when the count reaches 10, I will execute some command at the child
is it OK?

Thanks a lot!

[Keith Thompson]

Re: child thread question

"QQ" <junciu@yahoo.c om> writes:[color=blue]
> Hi I am writing a multithreads program.
> I have a variable in the main thread,
> can I use it at the child thread?
> For example I have a count in main,
> when the count reaches 10, I will execute some command at the child
> is it OK?[/color]

We don't know. Standard C doesn't have threads.

Try comp.programmin g.threads.

--
Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.

[Walter Roberson]

Re: child thread question

In article <1115842971.974 474.275590@z14g 2000cwz.googleg roups.com>,
QQ <junciu@yahoo.c om> wrote:[color=blue]
>Hi I am writing a multithreads program.
>I have a variable in the main thread,
>can I use it at the child thread?
>For example I have a count in main,
>when the count reaches 10, I will execute some command at the child
>is it OK?[/color]

Maybe, maybe not. You did not happen to mention which threading
package you are using: there are different ones with different rules.

Not much about threading is generally considered appropriate in
comp.lang.c though, as clc deals mostly with ANSI/ISO standard C,
and threading is not part of those standards per se.


If you are using POSIX threads then you may wish to look at
condition variables -- though there are other ways such as
semaphores, write locks, and mutexes. For the condition you describe,
a semaphore would perhaps be the most natural, but I can't tell
at the moment whether it is part of POSIX threads or a local extension
on the man page I am examining. And as to how you would proceed under
Windows or other versions of threading... well, best ask these questions
in a newsgroup more specific for your OS.
--
I was very young in those days, but I was also rather dim.
-- Christopher Priest