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nested interrupts
- To: <ecos-discuss at sources dot redhat dot com>
- Subject: [ECOS] nested interrupts
- From: "Xavier Wang" <xavierwang at ms19 dot url dot com dot tw>
- Date: Thu, 18 Jan 2001 15:20:12 +0800
I got confused about nested interrupts. In
http://sources.redhat.com/ecos/docs-latest/porting/hal-interrupts.html
it seems that interrupts are disabled in ISRs, but enabled in DSRs.
But Hugo's description in the same page said that higher priority
interrupts are enabled before calling ISR. Which is true for nested
interrupts? If it's the former, should I rewrite the 'hal_cpu_int_enable'
macro used in hal_interrupt_stack_call_pending_DSRs (in vector.S)
to enable only higher priority interrupts? If it's the latter, what should
I do to support nested interrupts? (I'm using TX39/JMR3904 platform,
eCos version 1.3.1)
Besides, by looking into the source code, it seems that if there is any
pending DSRs, no thread will be run. So can a high priority thread be
blocked by a low priority interrupt (DSR)? Will it introduce some
problems for a real-time application?
Thanks.