XSI_REALTIME

The XSI_REALTIME option group indicates that the _POSIX_FSYNC, _POSIX_MEMLOCK, _POSIX_MEMLOCK_RANGE, _POSIX_MESSAGE_PASSING, _POSIX_PRIORITY_SCHEDULING, _POSIX_SHARED_MEMORY_OBJECTS, and _POSIX_SYNCHRONIZED_IO options are enabled.

Enable this option group with CONFIG_XSI_REALTIME.

When this option group is enabled, the _XOPEN_REALTIME feature test macro will be defined to a value other than -1.