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<?php
declare( strict_types = 1 );
namespace MediaWiki\Extension\Translate\Utilities;
use MediaWiki\MediaWikiServices;
/**
* Helper class for maintenance scripts to run things in parallel.
*
* See also ForkContoller and https://phabricator.wikimedia.org/T201970.
*
* @since 2020.11
* @license GPL-2.0-or-later
* @author Niklas Laxström
*/
class ParallelExecutor {
/** @var int[] */
private $pids = [];
/** @var int */
private $threads;
public function __construct( int $threads = 1 ) {
$this->threads = $threads;
}
public function runInParallel( callable $mainThread, callable $forkThread ): void {
// Fork to increase speed with parallelism. Also helps with memory usage if there are leaks.
$pid = -1;
if ( function_exists( 'pcntl_fork' ) ) {
$pid = pcntl_fork();
}
if ( $pid === 0 ) {
MediaWikiServices::resetChildProcessServices();
$forkThread();
exit();
} elseif ( $pid === -1 ) {
// Fork failed do it serialized
$forkThread();
} else {
// Main thread
$mainThread( $pid );
$this->pids[$pid] = true;
// If we hit the thread limit, wait for any child to finish.
if ( count( $this->pids ) >= $this->threads ) {
$status = 0;
$pid = pcntl_wait( $status );
unset( $this->pids[$pid] );
}
}
}
}
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