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fsmlabs的real time linux的内核

Some simple examples using the proc filesystem to access rt-resources

simple_proc.o:
==============

set up a /proc/hrtime file that returns the value of gethrtime when you call
cat /proc/hrtime

proc_start_stop.o:
==================

this is a sligtly modified hello.o that will report its runntime status in 
/proc/thread_status - and allow modifying the running variable via the 
/proc entry.

rtl11:~ # insmod proc_start_stop.o
rtl11:~ # cat /proc/thread_status
Thread State:1
rtl11:~ # echo 0 > /proc/thread_status
rtl11:~ # cat /proc/thread_status
Thread State:0

dmesg should show you that the rt-thread has terminated.

sysctl.o:
=========

example of using the sysctl functions to build a proc interface below 
/proc/sys/ the files are located in /proc/sys/dev/simple

info: contains some string to be printed - could print any kernel variable
debug: read/write access to an int to turn on/off debuging or thread or...

rtl11:~ # insmod sysctl.o
rtl11:~ # cat /proc/sys/dev/simple/info
Some infos via sysctl
rtl11:~ # cat /proc/sys/dev/simple/debug
0
rtl11:~ # echo 2 > /proc/sys/dev/simple/debug
rtl11:~ # cat /proc/sys/dev/simple/debug
1

sysctl_start_stop.o:
====================

same as proc_start_stop.o just using sysctl interface

rtl11:~ # insmod sysctl_start_stop.o
rtl11:~ # cat /proc/sys/dev/simple/info
RT-thread done with loop 10
rtl11:~ # cat /proc/sys/dev/simple/status
1
rtl11:~ # echo 0 > /proc/sys/dev/simple/status
rtl11:~ # dmesg
elapsed_time = 60500028544
elapsed_time = 61000028768
elapsed_time = 61500028960
Terminating thread - setting status to 0
elapsed_time = 62000029568
rtl11:~ # cat /proc/sys/dev/simple/info
RT-thread done with loop 48