thread/Util: implement system call wrapper for sched_setscheduler()
There is a POSIX definition for sched_setscheduler(), but Linux does not implement that; instead of changing the process's scheduler, it only affects one thread. This has caused some confusion among application developers and C library developers. While glibc implements Linux semantics, Musl has made their sched_setscheduler() function an always-failing no-op, causing the error message "sched_setscheduler failed: Function not implemented". http://git.musl-libc.org/cgit/musl/commit/src/sched/sched_setscheduler.c?id=1e21e78bf7a5c24c217446d8760be7b7188711c2 Instead of relying on the C library which may be unreliable here, we now roll our own system call wrapper. Closes #218
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Max Kellermann