Build just once when tfms run in parallel by nohwnd · Pull Request #15465 · microsoft/vstest (original) (raw)

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Merged

nohwnd

merged 2 commits into

Mar 10, 2026

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Description

Running dotnet test would trigger build of assets from two places at the same time, which does more work, and also fails occasionally when they run into each other.

Related issue

Fix #15453

Copilot AI review requested due to automatic review settings

March 9, 2026 16:24

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Pull request overview

This PR prevents parallel dotnet test runs (across TFMs) from rebuilding/patching the same test assets concurrently by introducing a named mutex guarding the one-time build/setup work.

Changes:

• Added a named Mutex to serialize build/setup across parallel test runs within the same repo clone.
• Moved build/setup steps (unzip, cache cleanup, asset builds, dotnet patching) behind the mutex.
• Added a timeout path for waiting test runs.

This was referenced

May 26, 2026

This was referenced

Jun 16, 2026

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