The CriticalSection is a simple object that handles the critical section overhead for you and lets you focus on the actual code.
use PetrKnap\CriticalSection\CriticalSection;
use Symfony\Component\Lock\NoLock;
$lock = new NoLock();
$criticalOutput = CriticalSection::withLock($lock)(fn () => 'This was critical.');
var_dump($criticalOutput);
You can wrap critical sections one inside the other thanks to the WrappingCriticalSection. This makes it easy to combine multiple locks, for example.
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);
You can also pass locks as array and leave the composition to the critical section.
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);
Use doctrine/dbal
and its transactional
method.
/** @var PetrKnap\CriticalSection\CriticalSectionInterface $criticalSection */
/** @var Doctrine\DBAL\Connection $connection */
$criticalSection(
fn () => $connection->transactional(
fn () => 'This was critical on DB server.'
)
);
Always use transactional
inside critical section to prevent starvation.
Run composer require petrknap/critical-section
to install it.
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The project is licensed under the terms of the LGPL-3.0-or-later
.