Experimental Physics and
Industrial Control System

Hi Andrew

The PREEMPT_RT patch makes the kernel fully pre-emptive (leading to
improved maximum latency) and adds support for priority inheritance
mutexes. There are no user space API changes, the code to use
_POSIX_THREAD_PRIORITY_SCHEDULING and _POSIX_THREAD_PRIO_INHERIT is
already in libCom (if disabled by default). I'd like to use the
epicsMessageQueue from a high priority thread but the send and receive
functions may calloc an eventNode, and that might cause a page fault or
block my thread on the malloc lock. I'd like to be able to pre-allocate
the eventNodes because I know the maximum number of threads that may
wait on the queue in advance.

James