Re: [Xenomai-help] Task lock/unlock unlock difficulties

[Philippe Gerum <rpm@xenomai.org>]

Hans-J. Ude wrote:
> I need to lock/unlock the scheduler from time to time. I'm using the RTAI
> native skin in userspace and tried the rt_task_set_mode approach but was not
> very successfus yet. I've tried this:
> 
> int task_lock(void) { return rt_task_set_mode(0, T_LOCK, &mask); }
> int task_unlock(void) { return rt_task_set_mode(T_LOCK, mask, NULL); }
>
> To support nested calls to these functions i've implement an array of masks
> and lock/unlock counters to maintain a stack. I've also tried a single mask
> and no stack and with no mask at all. No success. It's hard to explain what
> exactly happens because I'm porting an existing software with a really bad
> design but the original works. I found there are xenomai functions called
> xnpod_lock_sched(), which are directly called from e.g. the vxWorks skin.
> Obviously xn_pod_lock has an integrated counting. Otherwise the vx skin
> would be incompatible. But when i include pod.h i get a whole bunch of error
> messages, likely due to missing defines. So can someone show me a way to a
> clean working counting lock/unlock mechanism.

Bypassing the interface won't help, especially if you think that there is an 
issue in the core. Please write a simple test case illustrating the use you want 
to make of sched locking using the native skin - which possibly exhibits the 
issue - and post it.

> 
> TAI,
> Hans
> 
> 
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-- 

Philippe.