Sockets and threads...

M

Mark Seger

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
 
Z

zentara

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
 
X

xhoster

Mark Seger said:
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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M

Mark Seger

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
 

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