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I want to open some sockets in one thread and write to them from my main
process and think this is very doable. I've been looking around a lot
for answers to this and I think I've figure it out but would like to
hear if my thinking is indeed correct:

Sockets are global to the process/threads already and so you don't have
to pass around file descriptors to make them visible to the main
process. I had tried (and failed) to share descriptors and failed
because they're not simple variables.

Looking at some code snippets it feels like all I need to do is get the
file number from $descriptor->fileno() and share that.

One way to convert a file number, assuming it's in $fn back to a
descriptor is the following:

open ($fd, ">&$fn);

and now I can syswrite() to it back in my main code. At least it seems
to be working correctly. Is this indeed the 'preferred' way to do this?
Am I missing something? Is there a better way?

-mark

On Wed, 05 Nov 2008 08:38:45 -0500, Mark Seger <>
wrote:

>I want to open some sockets in one thread and write to them from my main
>process and think this is very doable. I've been looking around a lot
>for answers to this and I think I've figure it out but would like to
>hear if my thinking is indeed correct:
>
>Sockets are global to the process/threads already and so you don't have
>to pass around file descriptors to make them visible to the main
>process. I had tried (and failed) to share descriptors and failed
>because they're not simple variables.
>
>Looking at some code snippets it feels like all I need to do is get the
>file number from $descriptor->fileno() and share that.
>
>One way to convert a file number, assuming it's in $fn back to a
>descriptor is the following:
>
>open ($fd, ">&$fn);
>
>and now I can syswrite() to it back in my main code. At least it seems
>to be working correctly. Is this indeed the 'preferred' way to do this?
> Am I missing something? Is there a better way?
>
>-mark

Sharing filhandles thru the fileno is the way to go with threads.

See http://perlmonks.org?node_id=662931

for some ideas.

zentara

Mark Seger <> wrote:
> I want to open some sockets in one thread and write to them from my main
> process and think this is very doable.

Open a socket to what? Are you opening sockets "internally" from one
thread to another within the same process? Is the "open" doing the accept,
or the connect?

> I've been looking around a lot
> for answers to this and I think I've figure it out but would like to
> hear if my thinking is indeed correct:
>
> Sockets are global to the process/threads already and so you don't have
> to pass around file descriptors to make them visible to the main
> process. I had tried (and failed) to share descriptors and failed
> because they're not simple variables.

Can you show code to illustrate this problem?

> Looking at some code snippets it feels like all I need to do is get the
> file number from $descriptor->fileno() and share that.
>
> One way to convert a file number, assuming it's in $fn back to a
> descriptor is the following:
>
> open ($fd, ">&$fn);

That only works if you only need to write on the socket. I can't
figure out how to open if you need both read and write.

> and now I can syswrite() to it back in my main code. At least it seems
> to be working correctly. Is this indeed the 'preferred' way to do this?
> Am I missing something? Is there a better way?

In most cases I can dream up in which I might want to use this, I suspect
I'd prefer to arrange the code differently in the first place.

Xho

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> Sharing filhandles thru the fileno is the way to go with threads.
yes, clearly the way to go! I now have a thread that listens for
connections, accepts them and writes the fileno into a share array.
-mark