Dispatch

1. Queues and Tasks

   Covers DispatchQueue, DispatchWorkItem, DispatchGroup, Dispatch Queue.

2. Thread Scheduling

   Covers DispatchQoS.

3. System Event Monitoring

   Covers DispatchSource, Dispatch Source, DispatchIO, DispatchData.

4. Task Synchronization

   Covers DispatchSemaphore, Dispatch Semaphore, Dispatch Barrier.

5. Time Constructs

   Covers DispatchTime, DispatchWallTime, DispatchTimeInterval, DispatchTimeoutResult.

6. Dispatch Objects

   Covers DispatchObject, DispatchPredicate, dispatchPrecondition(condition:), Dispatch Objects.

7. Deprecated

   Covers Deprecated Symbols.

8. Classes

   Covers DispatchWorkloop.

9. Reference

   Covers Dispatch Constants, Dispatch Data Types, Dispatch Functions.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

• Device Management System
• DeviceCheck App Services
• DeviceDiscoveryExtension Media
• DeviceDiscoveryUI System
• Disk Arbitration System
• DiskImageKit System
• Distributed App Frameworks
• dnssd System
• DocC Developer Tools
• DockKit App Services
• DriverKit System
• Endpoint Security System