Accepts a function or a thread (as returned by coroutine.create) and
calls/resumes it immediately through the engine's scheduler. Arguments
after the first are sent to the function/thread. This function does not
return any value, even if the provided function returns one immediately.

This function is based on the fastSpawn pattern rather than being a
replacement for the deprecated global `spawn` function. It is recommended
that this function be used in place of fastSpawn.

If the calling script is currently running in a serial execution phase,
then the spawned function or thread is resumed in the current serial
execution phase. If the calling script is currently running in a parallel
execution phase, then the spawned function or thread is resumed in the
current parallel execution phase. For more information, see
[Parallel Luau](/scripting/multithreading).


task.spawn

functionOrThread

A function or a thread returned by coroutine.create.


Arguments to send to the function or thread.


Calls/resumes a function/coroutine immediately through the engine
scheduler.


Accepts a function or a thread (as returned by coroutine.create) and
defers it until the next
[resumption cycle](https://devforum.roblox.com/t/1240569), at which point
it is resumed with the engine's scheduler like with
`Library.task.spawn()`. Arguments after the first are sent to the
function/thread. This function does not return any value, even if the
provided function returns one immediately.

This function should be used when a similar behavior to
`Library.task.spawn()` is desirable, but the thread does not need to run
immediately.

If the calling script is currently running in a serial execution phase,
then the deferred function or thread is resumed in a serial execution
phase. If the calling script is currently running in a parallel execution
phase, then the deferred function or thread is resumed in a parallel
execution phase. For more information, see
[Parallel Luau](/scripting/multithreading).


task.defer

Calls/resumes a function/coroutine on the next resumption cycle.


Accepts a function or a thread (as returned by coroutine.create) and
schedules it to be called/resumed on the next
`Class.RunService.Heartbeat|Heartbeat` after the given amount of time in
seconds has elapsed. Arguments after the second are sent to the
function/thread.

This function differs from the deprecated global `delay` function in that
**no throttling occurs**: on the very same Heartbeat step in which enough
time has passed, the function is guaranteed to be called/resumed.
Providing a duration of zero (0) will guarantee that the function is
called on the very next Heartbeat.

You can calculate the actual time passed by calling `Library.os.clock()`
upon scheduling and in the scheduled function.

If the calling script is currently running in a serial execution phase,
then the delayed function or thread is resumed in a serial execution
phase. If the calling script is currently running in a parallel execution
phase, then the delayed function or thread is resumed in a parallel
execution phase. For more information, see
[Parallel Luau](/scripting/multithreading).


task.delay

duration

The minimum number of seconds that must pass before the
function/thread is called/resumed.


Arguments to be passed to the function/thread when it is due to be
called/resumed.


Schedules a function/coroutine to be called/resumed on the next Heartbeat
after the given duration (in seconds) has passed, without throttling.


If the calling script is currently running in a serial execution phase,
`desynchronize` suspends the script and the script will be resumed in the
next parallel execution phase. If the calling script is currently running
in a parallel execution phase, `desynchronize` returns immediately and has
no effect.

Only scripts which are descendants of an Actor may call this method. If a
script outside of an Actor calls this method, an error will be raised.
ModuleScript's may also call `desynchronize` as long as the instantiation
of the module calling it was required by a script that is a descendant of
an Actor.

For more information, see
[Parallel Luau](/scripting/multithreading).


task.desynchronize

Causes the following code to be run in parallel.


If the calling script is currently running in a parallel execution phase,
`synchronize` suspends the script and the script will be resumed in the
next serial execution phase. If the calling script is currently running in
a serial execution phase, `synchronize` returns immediately and has no
effect.

Only scripts which are descendants of an Actor may call this method. If a
script outside of an Actor calls this method, an error will be raised.
ModuleScript's may also call `synchronize` as long as the instantiation of
the module calling it was required by a script that is a descendant of an
Actor.

For more information, see
[Parallel Luau](/scripting/multithreading).


task.synchronize

Causes the following code to be run in serial.


Yields the current thread until the given duration (in seconds) has
elapsed, then resumes the thread on the next
`Class.RunService.Heartbeat|Heartbeat` step. The actual amount of time
elapsed is returned.

If no duration is given, it will default to zero (0). This means the
thread resumes on the very next step, which is equivalent in behavior to
`RunService.Heartbeat:Wait()`

Unlike the deprecated global `wait`, this function **does not throttle**
and guarantees the resumption of the thread on the first Heartbeat that
occurs when it is due. This function also only returns the elapsed time
and nothing else.

If the calling script is currently running in a serial execution phase,
then the script is resumed in a serial execution phase. If the calling
script is currently running in a parallel execution phase, then the script
is resumed in a parallel execution phase. For more information, see
[Parallel Luau](/scripting/multithreading).


task.wait

The amount of time in seconds that should elapse before the current
thread is resumed.


Yields the current thread until the next Heartbeat in which the given
duration (in seconds) has passed, without throttling.


Cancels a thread and closes it, preventing it from being resumed manually
or by the task scheduler.

This function can be used with other members of the task library that
return a thread to cancel them before they are resumed. For example:

```lua
local thread = task.delay(5, function ()
  print("Hello world!")
end)

task.cancel(thread)
```

Note: Threads may be in a state where it is impossible to cancel them. For
example, the currently executing thread and threads that have resumed
another coroutine may not be cancelled. If this is the case, a lua error
will be generated.

However, code should not rely on specific thread states or conditions
causing `Library.task.cancel()` to fail. It is possible that future
updates will eliminate these constraints and allow threads in these states
to be successfully cancelled.


task.cancel

thread

Cancels a thread, preventing it from being resumed.


task

Allows for functions and threads to be coordinated with the Task Scheduler.


An object that runs connected functions upon a specific occurrence.

Data Type

RBXScriptSignal

Variant

Functions are blocks of code that can execute multiple times on command.

Luau

function

A double-precision floating-point number.

number

A function that executes alongside the main thread.

Library

coroutine

void

Overview

Guides

Tutorials

Reference

Resources

Design

Engine

Avatar

Cloud

This field may be set when creating a resource, but may not be modified by subsequent requests.

This field may be provided in requests, but will never be included in responses.

Per API Key: {maxInPeriod} requests every {periodInSeconds} seconds per IP Address

This field may be set on responses, but will be ignored in requests.

The following API key permissions are required to call this endpoint. For more
information on generating proper keys, see [Managing API Keys]({apiKeyReferenceDocLink}).

The following endpoints are available at paths relative to the base URL.

This string is formatted as a [FieldMask](/cloud/reference/types#fieldmask).

A JSON value can be `null`, `boolean`, `string`, `number`, `array`, or `object`.

The following scopes are required for your OAuth 2.0 application to use this endpoint. For more information on how to register an OAuth 2.0 application, see [App Registration and Review]({oauth2ReferenceDocLink}).

The following objects describe payloads that are accepted or returned. See each individual endpoint for more information on when these objects are used.

This string is formatted as a [Timestamp](/cloud/reference/types#timestamp).

This allows viewing information about your assets.

This allows uploading and updating assets to Roblox.

This allows you to view information about your Creator Store products.

This allows you to modify information about your Creator Store products.

This allows viewing information about your groups.

This allows you to manage group join requests for your account.

This allows viewing information about your inventory.

This grants the ability to publish messages on behalf of users.

This allows sending notifications from your experience to users

This allows listing secrets associated with your experience.

This allows creating and updating secrets associated with your experience.

Grants the ability to read place information.

Grants the ability to edit place information.

This operation grants access to publish new versions of experiences to Roblox.

Grants the ability to read experience information.

Grants the ability to edit experience information.

Grants the ability to read user's premium and verified status.

This allows you to view a user's social accounts.

This enables Single Sign-On functionality

This grants access to read your profile information

Default Value: {defaultValueStart}{defaultValueEnd}

An array is an ordered list of values. Arrays are useful for storing collections of data.

A set of key-value pairs, where the keys can be any number, string, or object.

This function returns immediately if possible, but can yield the thread that called it until it can return a value.

{nameStart}name{nameEnd} is no longer supported or maintained by Roblox.

This math operation is no longer supported or maintained by Roblox.

This member doesn’t appear in the object browser and is not intended for widespread use.

This member is only accessible only through the command bar. Attempting to access this member from scripts causes an error.

This function can’t pause the Lua thread that called it.

Attempting to access this member in scripts causes an error. You might be able to access this member from Roblox Studio's property window.

This member doesn’t appear in Roblox Studio’s Object Browser.

You can’t create an instance of this class with the Instance.new constructor.

Roblox does not replicate this member across its server-client boundary.

Lua code can’t access this member. You might be able to change its value from the property window in Roblox Studio.

This object’s replication behavior is dependent on the player who owns it.

This member is accessible only through the command bar and plugins only. Attempting to access this member from scripts causes an error.

This property is read-only and is safe to read in unsynchronized threads. Attempting to write to it causes an error.

This member is read only. Attempting to write to this member causes an error.

This member is accessible only in CoreScripts.

Only Roblox CoreScripts can access this member, and it isn’t usable by Players.

You can read and write to this property safely from multiple threads.

This class is a top-level singleton. Retrieve an instance of this class with the GetService function.

Multiple threads can potentially write to this property, so it’s unsafe to read from unsynchronized threads.

This function pauses the Lua thread that called it until it returns a result. This doesn’t interrupt other scripts.

Learn how to create successful content on Roblox with comprehensive guides, code samples, reference, and tutorials.


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task

Summary

Functions

Functions

spawn

Parameters

Returns

defer

Parameters

Returns

delay

Parameters

Returns

desynchronize

Returns

synchronize

Returns

wait

Parameters

Returns

cancel

Parameters

Returns