Re: [Xenomai-help] Non-Real-Time Asynchronous Notification

[Jan Kiszka <jan.kiszka@domain.hid>]

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Robert McCullough wrote:
> Hi Jan,
> 
>   --> -----Original Message-----
>   --> From: jan.kiszka@domain.hid [mailto:jan.kiszka@domain.hid]
>   --> Sent: Thursday, March 20, 2008 3:29 PM
>   --> To: rob@domain.hid
>   --> Cc: xenomai@xenomai.org
>   --> Subject: Re: [Xenomai-help] Non-Real-Time Asynchronous Notification
>   --> 
>   --> Robert McCullough wrote:
>   --> > Hi,
>   --> >
>   --> > How do I signal an asynchronous notification from a RTDM real-time
>   --> task to a
>   --> > non-real-time user-space Linux thread?
>   --> > Do I use Non-Real-Time Signaling Services (rtdm_nrtsig_init,..)?
>   --> > If so, how?
>   --> >
>   --> > Here is the current code that I am trying to port to RTDM.
>   --> >
>   --> > Current driver code to signal non-real-time Linux thread:
>   --> >
>   --> > 	// If event
>   --> > 	if(event){
>   --> > 		// and signal asynchronous readers
>   --> > 		if (kmdpr_device->async_queue)
>   --> > 			kill_fasync(&kmdpr_device->async_queue,
> SIGIO,
>   --> > POLL_IN);
>   --> > 	}
>   --> 
>   --> Just push this code in the rtdm_nrtsig handler and trigger the handler
>   --> execution from RT context.
>   --> 
>   --> Jan
> 
> [Robert McCullough] 
> Ok, I understand that but how do I specify the file operation fasync in my
> rtdm_device?  How do I replace or update the code marked TODO?

In fact, there is no fasync support available with RTDM, specifically as 
using signals under real-time constraints is a bad idea (not only 
because Xenomai has no hard-RT signal support).

But before suggesting any alternative pattern: What does your 
application actually require to work? How does asynchronous 
driver/application interaction currently look like?

Jan


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