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unix: fix signal handling data race #4287

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Commits on Jan 15, 2024

  1. unix: fix signal handling data race

    Changes to the `caught_signals` field should be immediately visible to
    other threads, otherwise "we get signal" events can get lost.
    
    Tentative fix for the linked issue. I say "tentative" because the cause
    is not fully understood but all signs point to libuv's handling of
    SIGCHLD signals, and they only manifest on architectures with weaker
    memory models than x86.
    
    Fixes: libuv#4279
    bnoordhuis committed Jan 15, 2024
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