---
title: danog\MadelineProto\Coroutine: Creates a promise from a generator function yielding promises.
description: When a promise is yielded, execution of the generator is interrupted until the promise is resolved. A success
value is sent into the generator, while a failure reason is thrown into the generator. Using a coroutine,
asynchronous code can be written without callbacks and be structured like synchronous code.

---
# `danog\MadelineProto\Coroutine`
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> Author: Daniil Gentili <daniil@daniil.it>  
  

Creates a promise from a generator function yielding promises.  

When a promise is yielded, execution of the generator is interrupted until the promise is resolved. A success
value is sent into the generator, while a failure reason is thrown into the generator. Using a coroutine,
asynchronous code can be written without callbacks and be structured like synchronous code.


## Method list:
* `fail(\Throwable $reason): void`
* `offsetGet(mixed $offset): \Amp\Promise`
* `getTrace(): array`
* `getFrame(): array`
* `jsonSerialize(): string`
* `onResolve()`

## Methods:
### `fail(\Throwable $reason): void`




Parameters:
* `$reason`: `\Throwable` Failure reason.  


#### See also: 
* `\Throwable`




### `offsetGet(mixed $offset): \Amp\Promise`

Get data at an array offset asynchronously.


Parameters:
* `$offset`: `mixed` Offset  


#### See also: 
* `\Amp\Promise`




### `getTrace(): array`

Get current stack trace for running coroutine.



### `getFrame(): array`

Get current execution frame.



### `jsonSerialize(): string`

Obtain.



### `onResolve()`





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