The lang/python27 port can optionally be built with the support for
POSIX semaphores - i.e. sem(4). This option is labeled as experimental
so it may be that the code is simply incorrect. I've tried it and get
frequent hangs with the python process in the "usem" state. The kernel
stack is as follows and looks reasonable:
# procstat -kk 19008
PID TID COMM TDNAME KSTACK
19008 101605 python - mi_switch+0x174
sleepq_catch_signals+0x2f4 sleepq_wait_sig+0x16 _sleep+0x269
do_sem_wait+0xa19 __umtx_op_sem_wait+0x51 amd64_syscall+0x450
Xfast_syscall+0xf7
The process doesn't react to SIGINT or SIGTERM but fortunately reacts to
SIGKILL.
This could be an error in Python code but OTOH this code is not
FreeBSD-specific so it's unlikely.
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