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Move Isolated EL operations to EL protocol #3070

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merged 4 commits into from
Jan 20, 2025
Merged

Move Isolated EL operations to EL protocol #3070

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db61aa1
Move Isolated EL operations to EL protocol
Lukasa Jan 17, 2025
f45e6dc
Already started improving matters
Lukasa Jan 17, 2025
b98d8cb
Make implementations inlinable
Lukasa Jan 20, 2025
3923209
Merge branch 'main' into cb-move-isolated-el-operations-to-protocol
glbrntt Jan 20, 2025
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2 changes: 1 addition & 1 deletion IntegrationTests/tests_04_performance/Thresholds/5.10.json
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@
"encode_1000_ws_frames_new_buffer_with_space_with_mask": 5050,
"execute_hop_10000_tasks": 0,
"flat_schedule_10000_tasks": 130100,
"flat_schedule_assume_isolated_10000_tasks": 150100,
"flat_schedule_assume_isolated_10000_tasks": 110100,
"future_assume_isolated_lots_of_callbacks": 74050,
"future_erase_result": 4050,
"future_lots_of_callbacks": 74050,
Expand Down
2 changes: 1 addition & 1 deletion IntegrationTests/tests_04_performance/Thresholds/5.9.json
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@
"encode_1000_ws_frames_new_buffer_with_space_with_mask": 5050,
"execute_hop_10000_tasks": 0,
"flat_schedule_10000_tasks": 130100,
"flat_schedule_assume_isolated_10000_tasks": 150100,
"flat_schedule_assume_isolated_10000_tasks": 110100,
"future_assume_isolated_lots_of_callbacks": 74050,
"future_erase_result": 4050,
"future_lots_of_callbacks": 74050,
Expand Down
2 changes: 1 addition & 1 deletion IntegrationTests/tests_04_performance/Thresholds/6.0.json
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@
"encode_1000_ws_frames_new_buffer_with_space_with_mask": 5050,
"execute_hop_10000_tasks": 0,
"flat_schedule_10000_tasks": 130100,
"flat_schedule_assume_isolated_10000_tasks": 150100,
"flat_schedule_assume_isolated_10000_tasks": 110100,
"future_assume_isolated_lots_of_callbacks": 74050,
"future_erase_result": 4050,
"future_lots_of_callbacks": 74050,
Expand Down
2 changes: 1 addition & 1 deletion IntegrationTests/tests_04_performance/Thresholds/nightly-6.0.json
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@
"encode_1000_ws_frames_new_buffer_with_space_with_mask": 5050,
"execute_hop_10000_tasks": 0,
"flat_schedule_10000_tasks": 130100,
"flat_schedule_assume_isolated_10000_tasks": 150100,
"flat_schedule_assume_isolated_10000_tasks": 110100,
"future_assume_isolated_lots_of_callbacks": 74050,
"future_erase_result": 4050,
"future_lots_of_callbacks": 74050,
Expand Down
2 changes: 1 addition & 1 deletion IntegrationTests/tests_04_performance/Thresholds/nightly-main.json
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@
"encode_1000_ws_frames_new_buffer_with_space_with_mask": 5050,
"execute_hop_10000_tasks": 0,
"flat_schedule_10000_tasks": 130100,
"flat_schedule_assume_isolated_10000_tasks": 150100,
"flat_schedule_assume_isolated_10000_tasks": 110100,
"future_assume_isolated_lots_of_callbacks": 74050,
"future_erase_result": 4050,
"future_lots_of_callbacks": 74050,
Expand Down
107 changes: 107 additions & 0 deletions Sources/NIOCore/EventLoop.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -395,6 +395,69 @@ public protocol EventLoop: EventLoopGroup {
///
/// - NOTE: Event loops only need to implemented this if they provide a custom scheduled callback implementation.
func cancelScheduledCallback(_ scheduledCallback: NIOScheduledCallback)

/// Submit a given task to be executed by the ``EventLoop``, from a context where the caller
/// statically knows that the context is isolated.
///
/// This is an optional performance hook. ``EventLoop`` implementers are not required to implement
/// this witness, but may choose to do so to enable better performance of the isolated EL views. If
/// they do so, ``EventLoop/Isolated/execute`` will perform better.
func _executeIsolatedUnsafeUnchecked(_ task: @escaping () -> Void)

/// Submit a given task to be executed by the ``EventLoop```, from a context where the caller
/// statically knows that the context is isolated.
///
/// Once the execution is complete the returned ``EventLoopFuture`` is notified.
///
/// This is an optional performance hook. ``EventLoop`` implementers are not required to implement
/// this witness, but may choose to do so to enable better performance of the isolated EL views. If
/// they do so, ``EventLoop/Isolated/submit`` will perform better.
///
/// - Parameters:
/// - task: The closure that will be submitted to the ``EventLoop`` for execution.
/// - Returns: ``EventLoopFuture`` that is notified once the task was executed.
func _submitIsolatedUnsafeUnchecked<T>(_ task: @escaping () throws -> T) -> EventLoopFuture<T>

/// Schedule a `task` that is executed by this ``EventLoop`` at the given time, from a context where the caller
/// statically knows that the context is isolated.
///
/// This is an optional performance hook. ``EventLoop`` implementers are not required to implement
/// this witness, but may choose to do so to enable better performance of the isolated EL views. If
/// they do so, ``EventLoop/Isolated/scheduleTask(deadline:_:)`` will perform better.
///
/// - Parameters:
/// - deadline: The instant in time before which the task will not execute.
/// - task: The synchronous task to run. As with everything that runs on the ``EventLoop```, it must not block.
/// - Returns: A ``Scheduled``` object which may be used to cancel the task if it has not yet run, or to wait
/// on the completion of the task.
///
/// - Note: You can only cancel a task before it has started executing.
@discardableResult
func _scheduleTaskIsolatedUnsafeUnchecked<T>(
deadline: NIODeadline,
_ task: @escaping () throws -> T
) -> Scheduled<T>

/// Schedule a `task` that is executed by this ``EventLoop`` after the given amount of time, from a context where the caller
/// statically knows that the context is isolated.
///
/// This is an optional performance hook. ``EventLoop`` implementers are not required to implement
/// this witness, but may choose to do so to enable better performance of the isolated EL views. If
/// they do so, ``EventLoop/Isolated/scheduleTask(in:_:)`` will perform better.
///
/// - Parameters:
/// - in: The amount of time before which the task will not execute.
/// - task: The synchronous task to run. As with everything that runs on the ``EventLoop``, it must not block.
/// - Returns: A ``Scheduled`` object which may be used to cancel the task if it has not yet run, or to wait
/// on the completion of the task.
///
/// - Note: You can only cancel a task before it has started executing.
/// - Note: The `in` value is clamped to a maximum when running on a Darwin-kernel.
@discardableResult
func _scheduleTaskIsolatedUnsafeUnchecked<T>(
in: TimeAmount,
_ task: @escaping () throws -> T
) -> Scheduled<T>
}

extension EventLoop {
Expand Down Expand Up @@ -422,6 +485,50 @@ extension EventLoop {
{
nil
}

/// Default implementation: wraps the task in an UnsafeTransfer.
public func _executeIsolatedUnsafeUnchecked(_ task: @escaping () -> Void) {
self.assertInEventLoop()
let unsafeTransfer = UnsafeTransfer(task)
self.execute {
unsafeTransfer.wrappedValue()
}
}

/// Default implementation: wraps the task in an UnsafeTransfer.
public func _submitIsolatedUnsafeUnchecked<T>(_ task: @escaping () throws -> T) -> EventLoopFuture<T> {
self.assertInEventLoop()
let unsafeTransfer = UnsafeTransfer(task)
return self.submit {
try unsafeTransfer.wrappedValue()
}
}

/// Default implementation: wraps the task in an UnsafeTransfer.
@discardableResult
public func _scheduleTaskIsolatedUnsafeUnchecked<T>(
deadline: NIODeadline,
_ task: @escaping () throws -> T
) -> Scheduled<T> {
self.assertInEventLoop()
let unsafeTransfer = UnsafeTransfer(task)
return self.scheduleTask(deadline: deadline) {
try unsafeTransfer.wrappedValue()
}
}

/// Default implementation: wraps the task in an UnsafeTransfer.
@discardableResult
public func _scheduleTaskIsolatedUnsafeUnchecked<T>(
in delay: TimeAmount,
_ task: @escaping () throws -> T
) -> Scheduled<T> {
self.assertInEventLoop()
let unsafeTransfer = UnsafeTransfer(task)
return self.scheduleTask(in: delay) {
try unsafeTransfer.wrappedValue()
}
}
}

extension EventLoop {
Expand Down
29 changes: 9 additions & 20 deletions Sources/NIOCore/EventLoopFuture+AssumeIsolated.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -34,10 +34,7 @@ public struct NIOIsolatedEventLoop {
@available(*, noasync)
@inlinable
public func execute(_ task: @escaping () -> Void) {
let unsafeTransfer = UnsafeTransfer(task)
self._wrapped.execute {
unsafeTransfer.wrappedValue()
}
self._wrapped._executeIsolatedUnsafeUnchecked(task)
}

/// Submit a given task to be executed by the `EventLoop`. Once the execution is complete the returned `EventLoopFuture` is notified.
Expand All @@ -48,10 +45,7 @@ public struct NIOIsolatedEventLoop {
@available(*, noasync)
@inlinable
public func submit<T>(_ task: @escaping () throws -> T) -> EventLoopFuture<T> {
let unsafeTransfer = UnsafeTransfer(task)
return self._wrapped.submit {
try unsafeTransfer.wrappedValue()
}
self._wrapped._submitIsolatedUnsafeUnchecked(task)
}

/// Schedule a `task` that is executed by this `EventLoop` at the given time.
Expand All @@ -70,10 +64,7 @@ public struct NIOIsolatedEventLoop {
deadline: NIODeadline,
_ task: @escaping () throws -> T
) -> Scheduled<T> {
let unsafeTransfer = UnsafeTransfer(task)
return self._wrapped.scheduleTask(deadline: deadline) {
try unsafeTransfer.wrappedValue()
}
self._wrapped._scheduleTaskIsolatedUnsafeUnchecked(deadline: deadline, task)
}

/// Schedule a `task` that is executed by this `EventLoop` after the given amount of time.
Expand All @@ -93,10 +84,7 @@ public struct NIOIsolatedEventLoop {
in delay: TimeAmount,
_ task: @escaping () throws -> T
) -> Scheduled<T> {
let unsafeTransfer = UnsafeTransfer(task)
return self._wrapped.scheduleTask(in: delay) {
try unsafeTransfer.wrappedValue()
}
self._wrapped._scheduleTaskIsolatedUnsafeUnchecked(in: delay, task)
}

/// Schedule a `task` that is executed by this `EventLoop` at the given time.
Expand All @@ -122,10 +110,11 @@ public struct NIOIsolatedEventLoop {
line: UInt = #line,
_ task: @escaping () throws -> EventLoopFuture<T>
) -> Scheduled<T> {
let unsafeTransfer = UnsafeTransfer(task)
return self._wrapped.flatScheduleTask(deadline: deadline, file: file, line: line) {
try unsafeTransfer.wrappedValue()
}
let promise: EventLoopPromise<T> = self._wrapped.makePromise(file: file, line: line)
let scheduled = self.scheduleTask(deadline: deadline, task)

scheduled.futureResult.flatMap { $0 }.cascade(to: promise)
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Can we save an alloc here if we use scheduled.futureResult.whenComplete { ... }?

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I don't think so: the flatMap unwraps an extra level of futureness.

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I mean like this (I appreciate it's more code than the flatMap + cascade):

scheduled.futureResult.whenComplete { result in
    switch result {
    case .success(let futureResult):
        promise.completeWith(futureResult)
    case .failure(let error):
        promise.fail(error)
    }
}

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Yes, you're probably right. However, all the flatScheduleTask implementations in swift-nio follow this spelling. I've filed #3071 to track making the improvement generically, and so for now would rather keep this in line with the others.

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Thanks for filing that, makes sense to track them together.

return .init(promise: promise, cancellationTask: { scheduled.cancel() })
}

/// Returns the wrapped event loop.
Expand Down
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