Re: [rtl] Floating point in "restricted" code

[Victor Yodaiken]

On Tue, Jun 20, 2000 at 03:41:08PM +0200, Paolo Mantegazza wrote:
> Pavel Andris wrote:
> 
> > You may consider a problem, FP is not allowed in interrupt service routine
> > (ISR).
> 
> Who said that?
> 
> > The remedy is, write only a short ISR, that wakes up a RT-thread
> > (pthread_wakeup_np()) and returns. Having finished the job, the RT-thread
> > suspends itself (pthread_suspend_np).
> 
> That's your idea for paying more than needed, the task switch cost. 

A couple of instructions. Dwarfed by the cost of saving and restoring
the FPU.




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