make Profile more thread/signal-safe #37101
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This hack, added in 7e95d09, was a workaround for LLVM3.3 not being able to generate binaries with the mandatory SEH section information. Now, it is just a potential source of segfaults in observation.
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Investigated the macOS hang overnight and tracked down the version of macOS that introduced that bug—let's see how this does now. |
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Internally these codepaths contain an rwlock on every platform (or are specified that you should hold one). So this adds that lock, and additionally blocks signals on unix for extra protection against deadlock here.
Fixes #35117
Fixes #13294