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send_sig can't work



Hello
    I wrote an interrupt service routin that send sig to user space
program to inform some event happed,(My kernel version is 2.0.38) I am sure that (according prink message) the signal has been send to program "a", send_sig(SIGUSR1, p, 1); and the user space program catch the signal SIGUSR1,(by using kill -10 pid, i know that it is ok), when the interrupt happen, the kernel indeed call the send_sig function, but the user space progamme didn't catch the signal , Why. I can't fix out this problem.
                                Thanks
                                                                            tongchangda