>> I've got a RTLinux system up and running with aa couple of rtl tasks
>> debugged and working. Now i'm attempting to add the needed application(s)
>> on the linux side. One particular app is using pthreads and it has
>> sucessfuly brought Linux to it's knees, after running for a short while.
>>
>> Does anyone know of any problems with RTLinux and pthreads that I shoudl be
>> watching out for?
>
>A few points.
>
>1/ If you are creating threads within a thread, you may have a problem
>on RTLinux as it uses kmalloc with GFP_KERNEL which is not advisable in
>a real time context. Either create your tasks during the init_module,
>or use the RTAI and it's pthreads module.
>
>2/ If you are used to using the older API, you need to be aware that
>when you create a pthread, it can start immediately. This means that
>you must put the suspension point at the begining of the while loop not
>the end, e.g.
>
>void *task(void *arg)
>{
> // initialisation code
>
> while(1) {
> pthread_wait_np();
>
> // working code of the task
>
> }
>}
>
The prog using pthreads is not an RTLinux task, it's in the Linux execution
domain (user thread). Is it ncessary for the prog to be an RTLinux task in
order to use ..._np()'s?
Thanks
Bob
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