[Asterisk-Dev] Hard real-time?

[Steve Kann]

Ricardo Poppi wrote:

> Hi all! There are some linux kernel projecs that provides hardware 
> real-time kernel for real time applications. I´ve been looking around 
> about RTLinux and RTAI. Those hard real-time kernel implementations 
> provides a hardware abstraction layer where the regular linux kernel 
> is executed as a low priority task. But - now comes the candy - all 
> the real time applications are executed by this HAL as high priority 
> so it should guarantee the real time responses needed.
>
> But - now comes the issue - the "real-time application" needs to be 
> written using those "new" cappabilities. Take a short look at this 
> sentence about RTLinux programing impact: "...From the application 
> programmers point of view, the queues look very much like standard 
> UNIX character devices, accessed via POSIX read/write/open/ioctl 
> system calls. Shared memory is currently accessed via the POSIX mmap 
> calls..."
>
> Do anybody knows about a hard real-time asterisk dev 
> project/prototype/beta going on?

I think that getting proper soft-real-time support to work more sanely 
would be a much simpler first step (more "bang for the buck", so-to-speak).

I have patches which implement the ideas in a mantis bug about this,  
and I'll be putting them up soon.  Basically, they'll allow you to, 
safely, run asterisk as real-time under linux.

-SteveK