Constructs a new SyncMutex object

# SyncMutex::__construct

(PECL sync >= 1.0.0)

SyncMutex::__construct — Constructs a new SyncMutex object

### 説明

public function SyncMutex::__construct(string `$name` = ?)

Constructs a named or unnamed countable mutex.

### パラメータ

`name`
  The name of the mutex if this is a named mutex object.

  > 注意: If the name already exists, it must be able to be opened by the current user that the process is running as or an exception will be thrown with a meaningless error message.

### 戻り値

The new SyncMutex object.

### エラー / 例外

An exception is thrown if the mutex cannot be created or opened.

### 例

例1 SyncMutex::__construct() named mutex with lock timeout example

    <?php
    $mutex = new SyncMutex("UniqueName");

    if (!$mutex->lock(3000))
    {
        echo "Unable to lock mutex.";

        exit();
    }

    /* ... */

    $mutex->unlock();
    ?>

例2 SyncMutex::__construct() unnamed mutex example

    <?php
    $mutex = new SyncMutex();

    $mutex->lock();

    /* ... */

    $mutex->unlock();
    ?>

### 参考

- SyncMutex::lock() - Waits for an exclusive lock
- SyncMutex::unlock() - Unlocks the mutex

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