Subtract a number to the value of the atomic object.

# Swoole\Atomic::sub

(PECL swoole >= 1.9.0)

Swoole\Atomic::sub — Subtract a number to the value of the atomic object.

### 说明

public function Swoole\Atomic::sub(int `$sub_value` = ?): int

Subtract a number to the value of the atomic object.

### 参数

`sub_value`

  The value which will be subtracted to the current value.

### 返回值

The current value of the atomic object.

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