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general_threading_rules.md: Add intro about EDT and background threads

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Karol Lewandowski 2024-04-10 12:36:58 +02:00
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topics/basics/architectural_overview/general_threading_rules.md
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<link-summary>Threading rules for reading and writing to IntelliJ Platform data models, running and canceling background processes, and avoiding UI freezes.</link-summary>
In the IntelliJ Platform, code is executed on one of two thread types:
- [Event Dispatch Thread](https://docs.oracle.com/javase/tutorial/uiswing/concurrency/dispatch.html) (EDT) - also known as the UI thread. It is used for updating the UI and performing changes in the IDE data model. Operations performed on EDT must be fast.
- background threads - used for performing costly operations.
## Read-Write Lock
> [Thread Access Info](https://plugins.jetbrains.com/plugin/16815-thread-access-info) plugin visualizes Read/Write Access and Thread information in the debugger.