From: "Xavier Wang" <xavierwang@ms19.url.com.tw>
To: <ecos-discuss@sources.redhat.com>
Subject: [ECOS] nested interrupts
Date: Wed, 17 Jan 2001 23:51:00 -0000 [thread overview]
Message-ID: <003b01c0811f$196395e0$6f2314ac@realtek.com.tw> (raw)
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.
next reply other threads:[~2001-01-17 23:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-17 23:51 Xavier Wang [this message]
2001-01-18 1:03 ` Jesper Skov
2001-01-18 4:15 ` Xavier Wang
2001-01-18 5:00 ` Nick Garnett
2001-01-18 4:59 ` Xavier Wang
2001-01-18 5:46 ` Nick Garnett
2001-01-18 21:52 ` Xavier Wang
2001-01-18 22:35 ` Jonathan Larmour
2001-01-18 8:26 ` Sergei Slobodov
2001-01-18 20:56 ` Xavier Wang
2001-01-18 22:37 ` Jonathan Larmour
-- strict thread matches above, loose matches on Subject: below --
2000-09-11 0:03 [ECOS] Nested Interrupts Sandeep Rikhi
2000-09-11 7:53 ` Jonathan Larmour
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='003b01c0811f$196395e0$6f2314ac@realtek.com.tw' \
--to=xavierwang@ms19.url.com.tw \
--cc=ecos-discuss@sources.redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).