# mutex-db-pgsql
**Repository Path**: mirrors_yiisoft/mutex-db-pgsql
## Basic Information
- **Project Name**: mutex-db-pgsql
- **Description**: Postgres mutex implementation for yiisoft/mutex.
- **Primary Language**: Unknown
- **License**: BSD-3-Clause
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No
## Statistics
- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-08-19
- **Last Updated**: 2026-02-07
## Categories & Tags
**Categories**: Uncategorized
**Tags**: None
## README
Yii Mutex Library - PostgreSQL PDO Driver
[](https://packagist.org/packages/yiisoft/mutex-pdo-pgsql)
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This library provides a PostgreSQL mutex implementation for [yiisoft/mutex](https://github.com/yiisoft/mutex).
## Requirements
- PHP 7.4 or higher.
- `PDO` PHP extension.
## Installation
The package could be installed with [Composer](https://getcomposer.org):
```shell
composer require yiisoft/mutex-pdo-pgsql
```
## General usage
The package provides two classes implementing `MutexInterface` and `MutexFactoryInterface`
from the [yiisoft/mutex](https://github.com/yiisoft/mutex) package:
```php
/**
* @var \PDO $connection Configured for PostgreSQL.
*/
$mutex = new \Yiisoft\Mutex\Pgsql\PgsqlMutex('mutex-name', $connection);
$mutexFactory = new \Yiisoft\Mutex\Pgsql\PgsqlMutexFactory($connection);
```
There are multiple ways you can use the package. You can execute a callback in a synchronized mode i.e. only a
single instance of the callback is executed at the same time:
```php
$synchronizer = new \Yiisoft\Mutex\Synchronizer($mutexFactory);
$newCount = $synchronizer->execute('critical', function () {
return $counter->increase();
}, 10);
```
Another way is to manually open and close mutex:
```php
$simpleMutex = \Yiisoft\Mutex\SimpleMutex($mutexFactory);
if (!$simpleMutex->acquire('critical', 10)) {
throw new \Yiisoft\Mutex\Exception\MutexLockedException('Unable to acquire the "critical" mutex.');
}
$newCount = $counter->increase();
$simpleMutex->release('critical');
```
It could be done on lower level:
```php
$mutex = $mutexFactory->createAndAcquire('critical', 10);
$newCount = $counter->increase();
$mutex->release();
```
And if you want even more control, you can acquire mutex manually:
```php
$mutex = $mutexFactory->create('critical');
if (!$mutex->acquire(10)) {
throw new \Yiisoft\Mutex\Exception\MutexLockedException('Unable to acquire the "critical" mutex.');
}
$newCount = $counter->increase();
$mutex->release();
```
The `PgsqlMutex` supports the "wait for a lock for a certain time" functionality. Using the `withRetryDelay()`
method, you can override the number of milliseconds between each try until specified timeout times out:
```php
$mutex = $mutex->withRetryDelay(100);
```
By default, it is 50 milliseconds - it means that we may try to acquire lock up to 20 times per second.
## Documentation
- [Internals](docs/internals.md)
If you need help or have a question, the [Yii Forum](https://forum.yiiframework.com/c/yii-3-0/63) is a good place for that.
You may also check out other [Yii Community Resources](https://www.yiiframework.com/community).
## License
The Yii Mutex Library - PostgreSQL PDO Driver is free software. It is released under the terms of the BSD License.
Please see [`LICENSE`](./LICENSE.md) for more information.
Maintained by [Yii Software](https://www.yiiframework.com/).
## Support the project
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