Also, there are probably many more places that need to become critical sections. We need to find them and use SCM_CRITICAL_SECTION_START/END or scm_frame_critical_section, as appropriate.
The ones I've spotted are (I might have posted this before),
gethostbyname getpwuid
If at all possible, this code should be switched to use get*by*_r, or in the gethostby* cases, perhaps getaddrinfo and getnameinfo. Marking it as a critical section for Guile won't prevent some other thread that is doing no Guile stuff at all from calling gethostbyname or whatever around the same time.
Ken
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