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hw: comment conditions of interprocessor interrupt

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ref #1088
This commit is contained in:
Martin Stein 2014-03-11 15:58:31 +01:00 committed by Norman Feske
parent 8ce197d7fa
commit f988c254df
1 changed files with 12 additions and 1 deletions
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13
base-hw/src/core/kernel/processor.cc
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@ -63,7 +63,18 @@ void Kernel::Processor::schedule(Processor_client * const client)
{
if (_id != executing_id()) {
/* remote add client and let target processor notice it if necessary */
/*
* Remote add client and let target processor notice it if necessary
*
* The interrupt controller might provide redundant submission of
* inter-processor interrupts. Thus its possible that once the targeted
* processor is able to grab the kernel lock, multiple remote updates
* occured and consequently the processor traps multiple times for the
* sole purpose of recognizing the result of the accumulative changes.
* Hence, we omit further interrupts if there is one pending already.
* Additionailly we omit the interrupt if the insertion doesn't
* rescind the current scheduling choice of the processor.
*/
if (_scheduler.insert_and_check(client) && !_ip_interrupt_pending) {
pic()->trigger_ip_interrupt(_id);
_ip_interrupt_pending = true;