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these functions are expected to return an error code rather than
setting errno and returning -1.
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the sched_getaffinity syscall only fills a cpu set up to the set size
used/supported by the kernel. the rest is left untouched and userspace
is responsible for zero-filling it based on the return value of the
syscall.
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this is no longer used for anything, and reportedly clashed with a
builtin on certain compilers.
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this first commit just includes the CPU_* and sched_* interfaces, not
the pthread_* interfaces, which may be added later. simple
sanity-check testing has been done for the basic interfaces, but most
of the macros have not yet been tested.
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linux's sched_* syscalls actually implement the TPS (thread
scheduling) functionality, not the PS (process scheduling)
functionality which the sched_* functions are supposed to have.
omitting support for the PS option (and having the sched_* interfaces
fail with ENOSYS rather than omitting them, since some broken software
assumes they exist) seems to be the only conforming way to do this on
linux.
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these actually work, but for now they prohibit actually setting
priority levels and report min/max priority as 0.
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