Questions about hrtimer interrupt handling

[John Gamboa <vaulttech@xxxxxxxxx>]

Hello...

I'm reading the code of the "hrtimer" [1] in order to use them in something I've been programming lately. I read the tutorial in [2] and [3] about them, but it seems that the code has changed a little since when it was written. Thus, I have two questions:

1 - How can I know what CPU is handling a timer interruption (while inside of the interruption function)? Is it possible to a timer be started by a core and have its interruption handled by another core? (if the answer is "no", then I could just make sure I know what is the core starting the timer)

2 - In [2] it is said that there is a "void *data" pointer in the hrtimer API. The code changed in newer kernel versions and I didn't find such a pointer anymore. Supposing there is still such a pointer, what would be the "equivalent" of the "void *data" pointer there? I mean: is there still a way to pass some data to the hrtimer callback function? If the answer is "yes", then how?

Thanks for your attention...

[1] http://www.cs.fsu.edu/~baker/devices/lxr/http/source/linux/include/linux/hrtimer.h
    http://www.cs.fsu.edu/~baker/devices/lxr/http/source/linux/kernel/hrtimer.c

[2] http://lwn.net/Articles/167897/

[3] http://www.ibm.com/developerworks/linux/library/l-timers-list/

--
John Gamboa
rabanetescebolas.blogspot.com

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