Added an additional yield point prior to possibly long running initialization#115688
Added an additional yield point prior to possibly long running initialization#115688MihaZupan merged 10 commits intodotnet:mainfrom
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src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/SocketsHttpHandler.cs
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That's okay. This is already the case and something that It might still be worth adding the mitigation discussed in #115301 (comment) and similar, just in case we do hit the worst case of the init logic blocking for multiple seconds. |
src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/SocketsHttpHandler.cs
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Also added an explanation comment
between synchronous and asynchronous calls
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src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/SocketsHttpHandler.cs
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src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/SocketsHttpHandler.cs
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src/libraries/System.Net.Http/tests/FunctionalTests/DiagnosticsTests.cs
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Co-authored-by: Miha Zupan <mihazupan.zupan1@gmail.com>
Co-authored-by: Miha Zupan <mihazupan.zupan1@gmail.com>
src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/SocketsHttpHandler.cs
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to adhere to the code style
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/azp run runtime-libraries-coreclr outerloop |
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Azure Pipelines successfully started running 1 pipeline(s). |
| // The setup procedure is enqueued to thread pool to prevent the caller from blocking. | ||
| async Task<HttpResponseMessage> CreateHandlerAndSendAsync(HttpRequestMessage request, CancellationToken cancellationToken) | ||
| { | ||
| _handlerChainSetupTask ??= Task.Run(SetupHandlerChain); |
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If you want to optimize this a bit more and also remove the chance of double-setup you could use new Task(s => SetupHandlerChain(s), this) + CompareExchange + Task.Start (conditionally) and you don't need the method result here (so a void Task is sufficient), can use _handler after the setup task finishes.
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Sounds reasonable.
Already merged though. Do you think it justifies a separate issue? I'm not certain, because repeated initialization has been deemed not important.
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I don't think it's worth the extra logic.
…lization (#115688) * Added an additional yield point * Enqueued setup logic to thread pool Also added an explanation comment * Changed validation order to reduce discrepancies between synchronous and asynchronous calls * Updated comment Co-authored-by: Miha Zupan <mihazupan.zupan1@gmail.com> * Removed Volatile.Read to make the code more readable Co-authored-by: Miha Zupan <mihazupan.zupan1@gmail.com> * Removed the test that is no longer viable * Moved the nested method to adhere to the code style --------- Co-authored-by: Miha Zupan <mihazupan.zupan1@gmail.com>
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Closes #115301.
The changes are:
SendAsynccall and on the order of initialization and validation.Important note:
The setters of the class throw
InvalidOperationExceptionif the send operation is started on the instance of the class. This check is currently implemented based on whether inner_handlerisnullor not. Considering the current code assumes the possibility of multi-threaded initialization, this check is not super reliable.I've updated the test, which checks this behavior, to adjust to the new order of validation. If stronger guarantees should be provided, I can think about it, but it currently feels like everything (except for locking or
CompareExchange-ing additional flags around) would be only a best-effort attempt.