[ECOS] RTAI vs eCos

R Vamshi Krishna vamshi@cse.iitb.ac.in
Mon Apr 17 16:05:00 GMT 2006

I am working towards making eCos a hard real-time kernel. i.e to say each 
kernel primitive is deterministic and bounded by time.

But to find out what is currently making eCos being tagged as a soft 
real-time system, I have reached a dead end.

Initially I thought that the way the threads are dequeued in semaphores 
maybe an indicator. i.e the time to execute cyg_sem_signal() depends on 
the no. of threads blocked. Since (I thought) it was not deterministic, I 
tried to see RTAI's approach.

But RTAI instead enqueues, (PRIO_Q option) and this depends on no. of 
tasks blocked.

Can someone tell my what makes RTAI a hard real-time RTOS and not eCos.
It will be really helpful.


R.Vamshi Krishna,
M.Tech. CSE (II year),
IIT Bombay
Room no. 320, A-wing, Hostel-12
Mobile : +919869781633

Yesterday is a past, tomorrow is a future , today is a gift that's why it's called 'present'

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