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# Scheduler Implementations

## Topics

### Structures

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

A type that defines options the operation queue accepts.

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

The scheduler time type the operation queue uses.

### Instance Properties

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

The minimum tolerance the dispatch queue scheduler allows.

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

The operation queue’s definition of the current moment in time.

### Instance Methods

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

Performs the action at some time after the specified date, at the specified frequency, optionally taking into account tolerance if possible.

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

Performs the action at some time after the specified date, optionally taking into account tolerance if possible.

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

Performs the action at the next possible opportunity.

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