Apart of the C STL:  http://www.programmingsimplified.com/c/math.h/ceil   should be defined in math.h

On Feb 24, 2014, at 11:34 AM, Mark Pizzolato <notifications@github.com> wrote:

> In PDP10/pdp10_tim.c:
> 
> >  /* clk_tps is the new number of clocks ticks per second */
> > -clk_tps = 1000 / interval_millis;
> > +clk_tps = (int32) ceil((double)TIM_HW_FREQ /(double)tim_new_period);
> I can find no prior use or definition of ceil anywhere...
> 
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