Add loom support to std critical section implementation
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datdenkikniet
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therealprof
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Jul 29, 2025
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loomis a tool that can be used to validate concurrent programs exhaustively.This PR adds support for
loomto thestdimplementation ofcritical-section, with theloom-suggested approach of using acfgfor it. It raises the MSRV of this project to 1.73 when--cfg loomis specified, but otherwise does not affect it.An example use-case for finding problems using
loomcan be found here. It uses the same critical section implementation as is provided here. Without it,loomassumes that there are no synchronization/interruption points when a critical section starts or ends. Withloom, it runs all the concurrent permutations, and allowed us to repro (though we should've been usingloompreventatively) a concurrency bug.