Re: [PHP] socket_write eats data - solved

[Raditha Dissanayake]

Wouldn't this multiple connections be a problem for php? IMHO one of the 
main draw backs of the PHP IMAP library is the fact that you have to 
open and close and imap connection for each page. That issue is 
multiplied ten fold in this scenario isn't it?

Thomas Weber wrote:

No, it's TCP and a very uncomplicated protocol, everything is sent in clear
text. Major problem is the socket-multicasting to keep track of all clients
simultanly.
----- Original Message ----- 
From: "Raditha Dissanayake" <[EMAIL PROTECTED]>
To: "Thomas Weber" <[EMAIL PROTECTED]>; "PHP-List"
<[EMAIL PROTECTED]>
Sent: Sunday, September 14, 2003 2:59 AM
Subject: Re: [PHP] socket_write eats data - solved

 

Is IRC UDP?
Thomas Weber wrote:
   

Hi,

i've checked a hundred things before posting this question, but i forgot
     

the
 

most important thing, the buffer.
The 'eaten' writes were buffered by the network-kernel and sent as bunch
     

of
 

data. If too much data for the buffer is sent, the write is broken up and
completed in the next bunch-of-data.
My receive-script hasn't diplayed the raw output, but an unserialized
     

array,
 

fetched out of the received string.

Maybe this will will help someone in future.

Thomas 'Neo' Weber
---
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[EMAIL PROTECTED]
----- Original Message ----- 
From: "Thomas Weber" <[EMAIL PROTECTED]>
To: "PHP-List" <[EMAIL PROTECTED]>
Sent: Saturday, September 13, 2003 9:15 PM
Subject: [PHP] socket_write eats data



     

Hi,

I am deveoping a chatserver in IRC-style in PHP. For communication it
       

uses
 

socket-multiplexing aka socket_select. So long so good, works perfectly.
The problem is, than when i make several socket_write's to the same
       

client
 

without waiting about 0.1sec after each write, the written data gets
       

lost
 

somewhere. socket_write does NOT throw any error, the data seams just
sended, but the clients never receives it.
Small example of the used code:
-----
var $clients // array of 'client'-objects, each object has it's own
socket-descriptor in the object-variable $socket
function write_to_clients ($text) {
for ($i = 0; $i < count ($this->clients); $i++) {
  socket_write ($this->clients[$i]->socket, $text);
}
// usleep (10000); if this is uncommented, all write are received by
       

all
 

clients
}
for ($i = 0; $i < 10; $i++) {
  $this->write_to_clients ("test ".$i);
}
-----
Okay, this doesn't check the client-sockets for readiness to write, but

       

even

     

if I check (via socket_select), ALL clients are ready to write and
       

writes
 

get lost too. It can't be the network-connection, because the tests run

       

with

     

standalone PHP-clients on the same machine.

Is there any possibility to make fast writes without waiting after each
write? The wait limits the server to max. 10 writes per second, wich
       

isn't
 

really enaugh for a good chatserver.

Thanks for your help!

Thomas 'Neo' Weber
---
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