Custom main and global executors #2654
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Use `any TaskExecutor` instead of `any Executor` for `Task.defaultExecutor`. Rename `ExecutorJobKind` to `ExecutorJob.Kind`. Add `EventableExecutor`; replace `SerialRunLoopExecutor` with `MainExecutor`, then make `MainActor` and `PlatformMainExecutor` use the new protocol.
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The previous iteration would have required us to make calling the allocation methods a fatal error, and would have meant executors had to check explicitly for the `.task` job kind before using them. Instead, if we add a new `LocalAllocator` type, we can have an `allocator` property that is `nil` if the job doesn't support allocation, and a valid `LocalAllocator` otherwise.
rjmccall
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Since the previous pitch, I've added `Clock`-based `enqueue` methods and made a few other changes, notably to the way you actually set custome executors for your program.
Remove `EventableExecutor`; we can come back to that later. Update documentation for `currentExecutor` and add `preferredExecutor` and `currentSchedulableExecutor`. Move the clock-based enqueuing to a separate `SchedulableExecutor` protocol, and provide an efficient way to get it. This means we don't need the `supportsScheduling` property. Back `ClockTraits` with `UInt32`.
al45tair
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We should use typed throws, which will make this work better for Embedded Swift.
FranzBusch
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Mar 24, 2025
| /// 1. The custom executor associated with an `Actor` on which we are | ||
| /// currently running, or | ||
| /// 2. The preferred executor for the currently executing `Task`, or | ||
| /// 3. The task executor for the current thread |
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I think this should be "for the current task" instead of "current thread"
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I'm not sure there's a practical difference there; the task executors are tracked using thread local data.
Removed clock conversion functions; we're going to add `enqueue` and `run` functions instead. Updated comments for various items. Mention that we're planning to expose the built-in executor implementations by name.
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Add write up of custom executor proposals. There are still some concerns surrounding integration with Dispatch that need working through.