PHP code example of petrknap / critical-section

1. Go to this page and download the library: Download petrknap/critical-section library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php. 
    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

petrknap / critical-section example snippets


use PetrKnap\CriticalSection\CriticalSection;
use Symfony\Component\Lock\NoLock;

$lock = new NoLock();

$criticalOutput = CriticalSection::withLock($lock)(fn () => 'This was critical.');

var_dump($criticalOutput);


use PetrKnap\CriticalSection\CriticalSection;
use Symfony\Component\Lock\NoLock;

$lockA = new NoLock();
$lockB = new NoLock();

$criticalOutput = CriticalSection::withLock($lockA)->withLock($lockB)(fn () => 'This was critical.');

var_dump($criticalOutput);


use PetrKnap\CriticalSection\CriticalSection;
use Symfony\Component\Lock\NoLock;

$lockA = new NoLock();
$lockB = new NoLock();

$criticalOutput = CriticalSection::withLocks([$lockA, $lockB])(fn () => 'This was critical.');

var_dump($criticalOutput);


namespace PetrKnap\CriticalSection;

use Symfony\Component\Lock\NoLock;

/** @param Locked<Some\Resource> $resource */
function f(LockedResource $resource) {
    echo $resource->value;
}

$lock = new NoLock();
$resource = LockableResource::of(new Some\Resource('data'), $lock);
CriticalSection::withLock($lock)(fn () => f($resource));


/** @var PetrKnap\CriticalSection\CriticalSectionInterface $criticalSection */
/** @var Doctrine\DBAL\Connection $connection */
$criticalSection(
    fn () => $connection->transactional(
        fn () => 'This was critical on DB server.'
    )
);