On Fri, 2004-10-15 at 22:06 +0300, Perfect Stranger wrote: > I know that the interrupts are divided into maskable and non-maskable > interrupts. and what i want to know : > 1- is enabling/disabling interrupts the same as masking/unmasking > interrupts? and what is the differences in case not ? Yes. The definitions are basically the same. A non-maskable interrupt is one that cannot be disabled (disabled being the kernel term). > 2- can non-maskable interrupts be disabled (in the case that the two > operations (disable/mask) are not the same) ? No. > 3- how can disabled interrupts be unlost ?? and how do the PIC sends > them again to the CPU as they are enabled again ? No, they are not lost. They are queued in the interrupt controller and they pop when you re-enable interrupts. The only issue is that you only get one interrupt per-line, even if n>1 were queued on that line. This is almost never a problem, except with the timer interrupt. > 4- are masked interrupts lost ? or they are to be send again when they > are unmasked ? See #3. Robert Love -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
