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Fix issue #135 use StartImmediateAsTask instead of StartAsTask to prevent a thread hop #191

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merged 2 commits into from
Nov 4, 2023
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Fix issue #135 use StartImmediateAsTask instead of StartAsTask to prevent a thread hop #191

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c175ef1
Bypass a thread-hop by using `StartImmediateAsTask`
abelbraaksma Nov 2, 2023
57b742d
Update `relase-notes.txt` for `StartImmediateAsTask` performance impr…
abelbraaksma Nov 2, 2023
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7 changes: 4 additions & 3 deletions release-notes.txt
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Original file line number Diff line number Diff line change
@@ -1,9 +1,10 @@

Release notes:
0.4.x (unreleased)
- overhaul all doc comments, add exceptions info, improve tooltips experience, #136
- DEPRECATED: type 'TaskSeq<'T>' now replaces 'taskSeq<'T>', the latter deprecated FS0044, #187
- BINARY INCOMPATIBLE: TaskSeq module members are now static members, source code compatible, #186
- overhaul all doc comments, add exceptions, improve editor experience, #136
- DEPRECATED: 'taskSeq<_>' renamed to 'TaskSeq<_>', 'taskSeq' warns with FS0044, #187
- BINARY INCOMPATIBILITY: 'TaskSeq' module is now static members on 'TaskSeq<_>', fixes #184
- Performance: less thread hops with 'StartImmediateAsTask' instead of 'StartAsTask', fixes #135

0.4.0-alpha.1
- fixes not calling Dispose for 'use!', 'use', or `finally` blocks #157 (by @bartelink)
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2 changes: 1 addition & 1 deletion src/FSharp.Control.TaskSeq/AsyncExtensions.fs
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Expand Up @@ -8,5 +8,5 @@ module AsyncExtensions =

member _.For(source: TaskSeq<'T>, action: 'T -> Async<unit>) =
source
|> TaskSeq.iterAsync (action >> Async.StartAsTask)
|> TaskSeq.iterAsync (action >> Async.StartImmediateAsTask)
|> Async.AwaitTask
2 changes: 1 addition & 1 deletion src/FSharp.Control.TaskSeq/TaskSeqBuilder.fs
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Expand Up @@ -648,7 +648,7 @@ module HighPriority =
ResumableTSC<'U>(fun sm ->
let mutable awaiter =
Async
.StartAsTask(computation, cancellationToken = sm.Data.cancellationToken)
.StartImmediateAsTask(computation, cancellationToken = sm.Data.cancellationToken)
.GetAwaiter()

let mutable __stack_fin = true
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