note 37039 added to function.pcntl-fork
| From: | Jazeps at rn2 dot php dot net | Date: | Fri, 31 Oct 2003 13:01:16 +0000 |
| Subject: | note 37039 added to function.pcntl-fork | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-59574@lists.php.net to get a copy of this message | ||
Here is my example how one can create a number of threads that do the same thing.
The thing that each instance should execute is written in Process::go() method.
This code creates three threads called a, b and c. They all do the same thing: they iterate ten
times through a loop that says them to wait for a second and then print out their name and the
iteration number.
If you executed this on your UNIX machine that has PHP installed in /usr/local/phpcli (change that
if you have PHP elsewhere), you'd get smth like this:
a1
b1
c1
a2
b2
c2
a3
...
..
a9
b9
c9
[ note that the order how a1, b1, c1 appear may change - if by some reason a thread goes a little
bit slower than b or c, it would appear after the b1 and c1, and other iteration indicators of b, c
threads too ]
So, here comes the code:
#! /usr/local/phpcli/bin/php -q
<?php
/*
PHP jaabuut kaa CGI, --enable-pcntl
*/
class Process
{
var $ident;
function Process( $ident )
{
$this->ident = $ident;
}
function go()
{
for ( $i=1; $i<10; $i++ ) {
sleep(1);
echo $this->ident . $i . "\n";
}
}
}
$childrenTotal = 3;
$childrenNow = 0;
$childrenNames = array( 'a', 'b', 'c' );
while ( $childrenNow < $childrenTotal ) {
$pid = pcntl_fork();
if ( $pid == -1 ) {
die( "error\n" );
} elseif ( $pid == 0 ) {
$childrenNow++;
} else {
$process = new Process( $childrenNames[$childrenNow] );
$process->go();
die();
}
}
?>
----
Manual Page -- http://www.php.net/manual/en/function.pcntl-fork.php
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