linux@xxxxxxxxxxx wrote:
Sleeping in an ISR is not fundamentally impossible - I could design a multitasker that permitted it - but has significant problems, and most multitaskers, including Linux, forbid it.
You could design a system in which most ISRs can sleep, but even then you'll probably need to make exceptions. For example, the timer interrupt tends to drive the scheduler. This means the timer interrupt cannot go to sleep and expect the scheduler to wake it up at some point in the future - since there will be no new timer interrupts to drive the scheduler. This precludes the timer interrupt from taking certain sleeping locks, even on a system where interrupts can sleep (not Linux). Interrupts will always have some limitations, under any OS design. -- All Rights Reversed - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs
