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CVS commit: src/sys/arch/usermode

Module Name:    src
Committed By:   jmcneill
Date:           Thu Dec 15 03:42:33 UTC 2011

Modified Files:
        src/sys/arch/usermode/dev: clock.c cpu.c
        src/sys/arch/usermode/include: thunk.h
        src/sys/arch/usermode/usermode: thunk.c

Log Message:
Improve usermode timecounter. It's unreasonable to assume that we'll get
100 "SIGALRM" per second with an ITIMER_REAL at 100Hz on a HZ=100 host as
the timer may expire before a pending signal has been delivered.

Instead of setitimer, use timer_create + timer_settime and from our
intr handler use timer_getoverrun to determine how many ticks we have

To generate a diff of this commit:
cvs rdiff -u -r1.22 -r1.23 src/sys/arch/usermode/dev/clock.c
cvs rdiff -u -r1.54 -r1.55 src/sys/arch/usermode/dev/cpu.c
cvs rdiff -u -r1.40 -r1.41 src/sys/arch/usermode/include/thunk.h
cvs rdiff -u -r1.46 -r1.47 src/sys/arch/usermode/usermode/thunk.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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