Class

# ThreadAlreadyRunningException

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## Description

You tried to set the stack size of a thread that is already running or tried to call the Run method for a thread that is already running.

## Properties

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| Name                                                     | Type                               | Read-Only | Shared |
|----------------------------------------------------------|------------------------------------|-----------|--------|
| `ErrorNumber<threadalreadyrunningexception.errornumber>` | `Integer</api/data_types/integer>` |           |        |
| `Message<threadalreadyrunningexception.message>`         | `String</api/data_types/string>`   |           |        |

## Methods

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| Name                                                      | Parameters                                                                                              | Returns                                    | Shared |
|-----------------------------------------------------------|---------------------------------------------------------------------------------------------------------|--------------------------------------------|--------|
| `Constructor<threadalreadyrunningexception.constructor0>` | message As `String</api/data_types/string>` = "", errorNumber As `Integer</api/data_types/integer>` = 0 |                                            |        |
| `Stack<threadalreadyrunningexception.stack>`              |                                                                                                         | `String()</api/data_types/string>`         |        |
| `StackFrames<threadalreadyrunningexception.stackframes>`  |                                                                                                         | `StackFrame()</api/exceptions/stackframe>` |        |

## Property descriptions

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ThreadAlreadyRunningException.ErrorNumber

**ErrorNumber** As `Integer</api/data_types/integer>`

> Used to contain an error number that describes the runtime error.

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ThreadAlreadyRunningException.Message

**Message** As `String</api/data_types/string>`

> Used to contain descriptive text to display when the runtime exception is encountered.

## Method descriptions

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ThreadAlreadyRunningException.Constructor

**Constructor**(message As `String</api/data_types/string>` = "", errorNumber As `Integer</api/data_types/integer>` = 0)

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> `Constructors</api/language/constructor>` are special methods called when you create an object with the `New</api/language/new>` keyword and pass in the parameters above.
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> Used to raise your own `RuntimeException</api/exceptions/runtimeexception>` with a *message* and optional error number.

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ThreadAlreadyRunningException.Stack

**Stack** As `String()</api/data_types/string>`

> Returns a `String</api/data_types/string>` array that contains a list of all of the methods in the stack from the main entrypoint to the point at which the exception was invoked.
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> The stack contains all the method names up and including the current method name.
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> This feature only works if the **IncludeFunctionNames** property on the App object is selected in the Shared Build Settings.
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> In addition to your own method calls, you will also see framework method calls, but these may not always be completely accurate due to insufficient symbols for the OS to resolve.

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ThreadAlreadyRunningException.StackFrames

**StackFrames** As `StackFrame()</api/exceptions/stackframe>`

> Returns an array containing the stack when the exception was first raised.

## Compatibility

|                       |                                |
|-----------------------|--------------------------------|
| **Project Types**     | Console, Desktop, Mobile, Web  |
| **Operating Systems** | Android, Linux, macOS, Windows |

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`RuntimeException</api/exceptions/runtimeexception>` parent class; `CriticalSection</api/language/threading/criticalsection>`, `Semaphore</api/language/threading/semaphore>`, `Mutex</api/language/threading/mutex>`, `Thread</api/language/threading/thread>` classes; `Exception</api/exceptions/exception>`, `Try</api/language/try>` statements; `Catch</api/language/catch>` statement.

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