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Ran 18 Oct 2025 11:29AM UTC

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Build # 1310

Build Type

push

buildkite

Committed by

web-flow

Commit Message

[Profile] further improvements for Windows-only (#59877)

- Instead of preventing profiling entirely (which might deadlock if
DllInit accesses Julia in any way), use a suggestion by @gbaraldi to
abort the profile if it takes too long (100ms), allowing the stopped
thread to release any locks and free up both threads to continue all.
Many, many other projects have encountered this same bug, including
dotNet (closed as won't fix) and Firefox (uses a single stepping
debugger to find the memory address of the offending locks), but those
seem difficult responses for us.
- Define correct ordering for taking profile-related locks
- Profile all threads instead of just main thread
- Refactor needsSymRefreshModuleList to use a modern API for doing so
reliably. The API does not appear to implement the documented behaviors,
but it seems to do what we need.
- Make stack unwinding on Windows thread-safe so that using multiple
threads that throw exceptions won't cause memory corruption anymore
- Use condition variables for correctly controlling profiler start/stop,
instead of volatile

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