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Nanaloveyuki
84 lines
2.3 KiB
Markdown
84 lines
2.3 KiB
Markdown
---
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name: async-runtime-mode
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group: api
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category: async
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update-time: 20260512
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description: Read the current async runtime mode and distinguish native worker behavior from compatibility behavior.
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key-word:
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- async
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- runtime
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- mode
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- public
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---
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## Async-runtime-mode
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Read the current backend-specific async runtime mode. This API is the narrowest capability probe when you only care whether the current build is running native worker semantics or compatibility behavior.
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### Interface
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```moonbit
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pub fn async_runtime_mode() -> AsyncRuntimeMode {}
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```
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#### input
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- `none` - No arguments are required.
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#### output
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- `AsyncRuntimeMode` - Either `NativeWorker` or `Compatibility`.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- The return value is determined by the active backend implementation.
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- `async_runtime_mode_label(...)` converts the enum into a stable string value.
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- `async_runtime_supports_background_worker()` is a narrower boolean probe built on the same idea.
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- This API is intentionally small and useful for lightweight branching.
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### How to Use
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Here are some specific examples provided.
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#### When Need A Small Capability Branch
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When behavior should differ between native worker mode and compatibility mode:
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```moonbit
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match async_runtime_mode() {
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AsyncRuntimeMode::NativeWorker => println("native worker")
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AsyncRuntimeMode::Compatibility => println("compat")
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}
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```
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In this example, the branch is explicit and readable.
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#### When Need Stable String Output
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When the mode should be included in logs or telemetry labels:
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```moonbit
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println(async_runtime_mode_label(async_runtime_mode()))
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```
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In this example, the output becomes a stable string instead of an enum pattern-match requirement.
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### Error Case
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e.g.:
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- This API does not have a normal runtime failure mode; it reflects the compiled backend behavior.
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- If you need worker support as a direct boolean, use `async_runtime_supports_background_worker()` instead.
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### Notes
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Notes are here.
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1. Use this API for minimal mode branching.
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2. Use `async_runtime_state()` when you also want worker support packaged into one object.
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3. Use `AsyncLogger::state()` when you need logger instance counters and lifecycle flags too.
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4. The enum is intentionally small to keep capability branching simple.
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