Hi cheneydeng, 2012/2/22 cheneydeng <cheneydeng@xxxxxx>: > hi all, > I'm begin to learn the Kernel and i'm reading <<Linux kernel > development>>.It says "This is an important point, always keep in mind that > all interrupt handler has interrupted other code(possibly even another > interrupt handler on a different line)".What i am not able to understand is > how a interrupt handler be interrupted ? DID NOT it uninterrupted? It depends on the architecture and the interrupt controller being used, and the driver code itself. Normally, when an interrupt fires, that particular interrupt will be masked and your own handler won't interrupt itself, but you may very well be interrupted by other interrupts. It is possible to arrange things so that your interrupt handler interrupts itself, although you need to be really careful when doing this as if your interrupt fires too quickly things can escalate out of control pretty quickly. -- Dave Hylands Shuswap, BC, Canada http://www.davehylands.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
