harmony 鸿蒙Thread Model Overview (FA Model)
Thread Model Overview (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 OpenHarmony 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.
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