Commits on Nov 22, 2023

1. ensure short callbacks get around to a garbage collection …

   If foreign code invaokes a short callback while also allocating (e.g.,
   because it's invoking the callback in a new thread), then memory could
   increase indefinitely without a garbage collection triggered. Avoid
   that situation by making sure that a callback includes a trap check.
   Also, detect on thread creation whether a collection is pending, and
   setting the thread's trap value to minimum in that case.
   
   Meanwhile, "foreign4.c" as part of the test suite wasn't checking
   threading as intended on some platforms (such as macOS), and that's
   fixed in this commit.

   

   mflatt committed Nov 22, 2023
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