From: Andrew Lunn <andrew@lunn.ch>
To: Guilly A <guilly_work@hotmail.com>
Cc: ecos-discuss@sources.redhat.com
Subject: Re: [ECOS] Efficient way to wake up a task...
Date: Wed, 22 Jun 2005 17:42:00 -0000 [thread overview]
Message-ID: <20050622173907.GA8444@lunn.ch> (raw)
In-Reply-To: <BAY107-F259EC01B7D0211464B86F293EB0@phx.gbl>
On Wed, Jun 22, 2005 at 04:29:42PM +0000, Guilly A wrote:
> Hi
> I need to wake up a task after an interruption handling.
> I am wondering which is the more efficient way to do that :
> 1- suspend the task and resume it in the ISR
> 2- make the task wait forever for a flag and set the flag in the ISR
> 3- use mailboxes.
>
> On pSos, I used an event sending to wake up my task. I heard it was the
> fastest way and lowest memory cost do do it, compared to mailbox. But I had
> no evidence about it, I believed it naively.
> I don't know how is it for eCos.
>
> Thank you for your advices.
You should probably do the copy in the ISR. You then need to return
CYG_ISR_CALL_DSR so that a DSR is called. The DSR can then post on a
semaphore which will awaken the thread waiting on the semaphore.
Andrew
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prev parent reply other threads:[~2005-06-22 17:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-22 16:29 Guilly A
2005-06-22 17:42 ` Andrew Lunn [this message]
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