[stunnel-users] RE: --with-threads=ucontext portability
Michal.Trojnara at mobi-com.net
Tue Jan 31 16:43:09 CET 2006
Miloslav Trmac wrote:
> > What about the number of arguments? Why isn't "1" correct?
> Assume the traditional way of passing arguments on stack, with "int"
> naturally aligned. Then makecontext does something like this:
> - set stack pointer to "top" - argc * sizeof(int)
> - copy argc * sizeof (int) bytes from makecontext() arguments to stack
> - set up the rest of the frame
> If sizeof (void *) > sizeof (int), which happens on 64-bit
> platforms, the above doesn't copy the whole value of the
> pointer when argc == 1.
As you saw IRIX used just opposite default (pointer/long).
It seemed reasonable to me to align parameters to 8 byte baundary on 64-bit
I decided to change the default threading model. Ucontext creates quite a
lot of portability issues.
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