harmony 鸿蒙Thread Model (FA Model)

2023-02-03
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Thread Model (FA Model)

There are three types of threads in the FA model:

Main thread

Manages other threads.

Ability thread
- One ability thread for each ability.
- Distributes input events.
- Draws the UI.
- Invokes application code callbacks (event processing and lifecycle callbacks).
- Receives messages sent by the worker thread.
Worker thread

Performs time-consuming operations.

Based on the thread model, different services run on different threads. Service interaction requires inter-thread communication. Threads can communicate with each other in Emitter or Worker mode. Emitter is mainly used for event synchronization between threads, and Worker is mainly used to execute time-consuming tasks.

NOTE

The FA model provides an independent thread for each ability. Emitter is mainly used for event synchronization within the ability thread, between a pair of ability threads, or between the ability thread and worker thread.