I believe you have it right. Except I'd have to go analyze the controller's
manuals to see if there is a notion of interrupt priority -- more likely
any enabled int can preempt a TOSH_INTERRUPT(). I think the A,B_EVENTS()
will execute in the interrupt context from whence they were called. So
in this case SIGNAL(Y) will not fire and preempt SIGNAL(X) or A_EVENT().
But in _most_ cases pending interrupts will fire as soon as a TOSH_SIGNAL()
returns. So you are not likely to miss them unless you overrun by getting
more than one of the same type before you can service it.
MS
Man-Ki Yoon wrote:
Hi all.
I want to know the difference between TOSH_SIGNAL and TOSH_INTERRUPT.
AFAIK, TOSH_SIGNAL can’t be preempted by any other external interrupts!
On the other hand, TOSH_INTERRUPT can be preempted by other external
interrupts which have higher priority!
Is it right?
If so, the execution thread starting from TOSH_SIGNAL can’t be preempted
by any other external interrupts? Or only TOSH_SIGNAL portion?
In other words,
TOSH_SIGNAL(X) {
signal A_MODULE.A_EVENT();
}
TOSH_SIGNAL(Y) {
signal B_MODULE.B_EVENT();
}
Assume that A_MODULE.A_EVENT() is called by TOSH_SIGNAL and is
executing, and at that time, TOSH_SIGNAL(Y) is fired.
1) TOSH_SIGNAL(Y) can’t be fired.
2) TOSH_SIGNAL(Y) can be fired. And it preempts A_MODULE.A_EVENT().
Which is correct?
Best regards,
Man-Ki Yoon
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