# \[Marlin] M108 - Break and Continue

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**📅Update: 2020/09/18**
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## Description

The [`M108`](https://app.gitbook.com/docs/gcode/M108.html) command requires `EMERGENCY_PARSER` for full effectiveness. (Otherwise a full queue blocks the parser.)

Some G-code commands cause Marlin to go into a closed loop, waiting indefinitely for a certain state or event. For example, [`M109`](https://app.gitbook.com/docs/gcode/M109.html) waits for the target temperature to be reached, and [`M0`](https://app.gitbook.com/docs/gcode/M000-M001.html) waits for an LCD click.

In the case of [`M109`](https://app.gitbook.com/docs/gcode/M109.html), the [`M108`](https://app.gitbook.com/docs/gcode/M108.html) command stops waiting for the target temperature and continues processing G-code. This may result in "cold extrude" messages. For a full stop use [`M112`](https://app.gitbook.com/docs/gcode/M112.html).

In the case of [`M0`](https://app.gitbook.com/docs/gcode/M000-M001.html) the [`M108`](https://app.gitbook.com/docs/gcode/M108.html) command acts like the LCD button, breaking out of [`M0`](https://app.gitbook.com/docs/gcode/M000-M001.html) and continuing to process the G-code queue.

## Notes

* With both `EMERGENCY_PARSER` and `HOST_KEEPALIVE_FEATURE` enabled, hosts will be able to prompt for continuation or cancellation, confirming with [`M108`](https://app.gitbook.com/docs/gcode/M108.html) and cancelling with [`M112`](https://app.gitbook.com/docs/gcode/M112.html).

## Usage

`M108`

## Examples

Use [`M108`](https://app.gitbook.com/docs/gcode/M108.html) as a "Continue" button in your host software.

```
M0 You're up, mate ; in your G-code file
M108               ; as your "Continue" button
```


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