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The syscnt module supports more generic counters, in addition to atomic
access from any context on any architecture.
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Instead of mixing standard headers and internal redefinitions of standard
types, completely rely on the compiler for what is guaranteed for a free
standing environment. This results in the removal of kern/stddef.h and
kern/stdint.h. The kern/types.h header is reintroduced for the different
(and saner) purpose of defining types not specified in standard C,
namely ssize_t for now.
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This change introduces scheduling classes, including support for real-time
and time-sharing threads. The real-time class matches the requirements of
the POSIX SCHED_FIFO and SCHED_RR policies. The time-sharing class makes
use of a scheduling algorithm based on group ratio round-robin (GR3) to
provide proportional fairness.
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There are no precise enough criteria to justify the separation of these
two directories.
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