synchronize RT thread to external IRQ - suggestions?

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I've hardware at hand which would best be serviced by an RT-hardened thread after the hardware interrupts the host - in the simplest form it could be say a parport IRQ

squeezing out latency as far as possible is a must

I'm looking for suggestions how to best achieve that - just wait-for-irq in a normal device driver? any alternative schemes I should consider? (in the Xenomai setup an RTDM driver seems the way to go).

thanks in advance

Michael



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