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README.FreeBSD
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2002-09-15
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Here are some notes from Yasuhito FUTATSUKI <futatuki@fureai.or.jp>
(maintainer of cdrdao's FreeBSD port).
Real Time Scheduling
--------------------
In the LINT configuration file in which all devices' configurations
and all available kernel options is described, there are three
options as follows:
options "P1003_1B"
options "_KPOSIX_PRIORITY_SCHEDULING"
options "_KPOSIX_VERSION=199309L"
If the kernel has been built with these options, soft real time
scheduling code based on "rtpiro" are built in the kernel as a
POSIX scheduling system call implementation. OTOH if the kernel
has been built without them, sched_*() system calls' entities
are not compiled in it, so sche_*() calls always fail with
logging message such as
cmd cdrdao pid 1234 tried to use non-present sched_getparam
etc.
These options are not in the GENERIC kernel.