Wow, just wow. FreeBSD's pthread_mutex_lock can fail with ENOMEM. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71684#c2 …
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Was actually somewhat aware of this already from reading jemalloc's code. It has to have workarounds for the FreeBSD mutexes.
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Since it needs to grab a lock to allocate memory, and doing so will try to allocate memory. So it has a special spin lock case.
End of conversation
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