Hi, This is my understanding of how signals work.. Signals have no relative priorities. They are stored in sigset_t However, in terms of implementation, they are delivered in a fixed order to the process. The function to look at is do_signal which calls dequeue signal to get the next signal to process. If there are no more signals, it quits. The list of signals are kept in 2 32-bit words (on x86). This is set as _NSIG_WORDS. dequeue_signal calls next_signal which iterates over the 2 words, and gets the next signal pending, filters it through the signal mask and if it passes the mask, it is returned to dequeue_signal and is processed. Signals that are masked out are not processed. The iteration is done in a fixed order. You can look at signal.h under include/asm-*. So, the implementation forces a default priority if more than 1 signal is pending. All this is in 2.4.20.. Hopefully I got all this right. vijay On 08/01/06, Deepak Joshi <deepak_cins@xxxxxxxxxxx> wrote: > Hi all, > > Is there any priorities assigned to signals if more > than two signals are delivered to a process at the > same time ? how kernel handles it and what happens in > case of SMP based systems. i read about signals but > not able to get any info related to priority of > signals. > > plz explain how it is implemented in kernel ? > > Thanks and Regards, > Deepak Joshi. > > > > ___________________________________________________________ > Yahoo! Exclusive Xmas Game, help Santa with his celebrity party - http://santas-christmas-party.yahoo.net/ > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > -- Networks Lab, RPI http://poisson.ecse.rpi.edu/~vijay -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
