pradeep singh wrote:
On 4/20/07, Christian Boon <c.boon@xxxxxxxxxxxxxxxxxxxx> wrote:
Hello,
i've got a question about local_irq_save()
When i use this function to disable interrupts, does this mean that when
an interrupt occurs
when interrupts are disabled, for example from the ethernet chip, this
interrupt is lost or does it mean
that the interrupt isnt serviced at the moment but serviced when
interrupts are enabled again?
the interrupt is lost, if it maskable and not unmaskable interrupts
IMHO.Because local_irq_save() macro inturn makes use of cli assembly
instruction.
Somebody please CMIIW.
But isnt it bad that i loose for example an ethernet or timer interrupt?
i've got 2 interrupts in my driver which both need to write data in the
same buffer so when i keep
interrupts enabled, then i get bad behaviour.
Is the buffer too large.Try writing from different ends on the same
buffer for each interrupts.Does this helps anyway?
I need to write on the same location, meaning the next buffer position.
Is there a way to lock a buffer from two interrupt service routines
without disabling interrupts?
thanks in advance,
Chris.
--
To unsubscribe from this list: send an email with
"unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx
Please read the FAQ at http://kernelnewbies.org/FAQ
