[draft, do not review] IBuildEngineCallbacks in taskhosts#12991
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JanProvaznik wants to merge 14 commits intodotnet:mainfrom
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[draft, do not review] IBuildEngineCallbacks in taskhosts#12991JanProvaznik wants to merge 14 commits intodotnet:mainfrom
JanProvaznik wants to merge 14 commits intodotnet:mainfrom
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confirmed this can build wpf template and Roslyn.sln from the original issue 😏 |
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Jan 29, 2026
Implements callback infrastructure for TaskHost IBuildEngine callbacks: - Add packet type enum values for TaskHost callbacks (0x20-0x27 range) - Create ITaskHostCallbackPacket interface for request/response correlation - Add TaskHostQueryRequest/Response packets for property queries - Implement IsRunningMultipleNodes forwarding in OutOfProcTaskHostNode - Handle query requests in TaskHostTask (parent side) - Add integration tests for IsRunningMultipleNodes callback This enables tasks running in TaskHost to correctly query whether the build is running with multiple nodes, which is needed for multithreaded mode (-mt) support. Cherry-picked and adapted from PR dotnet#12991 (subtasks 1-2) Fixes part of dotnet#12863
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Fixes #12863
#12868
Context
required for wpf support in multithreaded mode
Changes Made
split the plan to subtasks, attempted implementation by agents
Testing
includes unit and integration tests
Notes