README.FreeBSD
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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.