On Tue, Nov 08, 2005 at 04:37:24PM +0200, John Que wrote: > Hello, > > Sorry; I did not completed my message; here is the full one: > > Thanks a lot for your answer ! > > Following your answer I did some reading in LDD3 and > "Undersatnding the linux kernel" and I want to > verify if I may that I understood the interrupts mechanism right > regarding my nethooks question: > > Suppose I will add another hook , of type NF_IP_FORWARD, with a callback > method named fw_hook(), to my exsiting NF_IP_PRE_ROUTING hook in my module. > > As I understand, I can be sure that my_hook() and also fw_hook() > will not be called a second time when an > interrupt on the NIC arrives (when working on a single CPU) > because they both are run under the same context (softirq context probably).
Yes. This is _not_ true for LOCAL_OUT hooks, though (since they're called from the process context of the sending userspace process. > So in fact, I do not have to worry about shared data structures > which may appear in both hook methods (my_hook() and fw_hook()) If you ever want your code to get merged into the mainline kernel, you have to worry. otherwise not. -- - Harald Welte <[EMAIL PROTECTED]> http://gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
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