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# Scheduler Implementations

## Topics

### Structures

[`struct SchedulerOptions`](/documentation/Foundation/RunLoop/SchedulerOptions)

A set of options that affect the operation of the run loop scheduler.

[`struct SchedulerTimeType`](/documentation/Foundation/RunLoop/SchedulerTimeType)

The scheduler time type that the run loop uses.

### Instance Properties

[`var minimumTolerance: RunLoop.SchedulerTimeType.Stride`](/documentation/Foundation/RunLoop/minimumTolerance)

The minimum tolerance the run loop scheduler allows.

[`var now: RunLoop.SchedulerTimeType`](/documentation/Foundation/RunLoop/now)

The run loop scheduler’s definition of the current moment in time.

### Instance Methods

[`func schedule(after: RunLoop.SchedulerTimeType, interval: RunLoop.SchedulerTimeType.Stride, tolerance: RunLoop.SchedulerTimeType.Stride, options: RunLoop.SchedulerOptions?, () -> Void) -> any Cancellable`](/documentation/Foundation/RunLoop/schedule(after:interval:tolerance:options:_:))

Performs the action at some time after the specified date, at the specified frequency, using the specified tolerance and options.

[`func schedule(after: RunLoop.SchedulerTimeType, tolerance: RunLoop.SchedulerTimeType.Stride, options: RunLoop.SchedulerOptions?, () -> Void)`](/documentation/Foundation/RunLoop/schedule(after:tolerance:options:_:))

Performs the action at some time after the specified date, using the specified tolerance and options.

[`func schedule(options: RunLoop.SchedulerOptions?, () -> Void)`](/documentation/Foundation/RunLoop/schedule(options:_:))

Performs the action at some time after the specified date, using the scheduler’s minimum tolerance.

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