On Sat, Oct 16, 1999 at 09:58:12PM +0200, Dr. Lex Wennmacher wrote:
> [...]
> I see several possible ways to remove the no-floating-point-in-a-signal-hander-
> restriction:
> 
> 1) the kernel always saves and restores the FPU for the process when calling a
>    signal handler;
> 2) the kernel does lazy saving of the FPU;
> 3) libc provides routines to save and restore the FPU. It is the responsibility
>    of the programmer to call these if floating point arithmetic is done in a
>    signal handler.
> [4) I'm not shure about the following: in function calls, the compiler could
>     implement saving of the FPU by the callee (as an option)?]
> 

I dislike [3]. In some cirtunstances there may be some 'hidden' FP ops.
What do other OSes do ?

--
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
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