Re: Maping of Ada tasks on the plateforme OS threads model

["Hibou57 (Yannick Duchêne)" <yannick_duchene@yahoo.fr>]

On 28 juin, 18:31, sjw <simon.j.wri...@mac.com> wrote:
> If you are using GNAT, be aware of GNAT.Threads; on some operating
> systems (VxWorks, for instance) you must call
> GNAT.Threads.Register_Thread in Ada code called (via C, for example)
> from an OS thread before you do anything involving the RTS (string
> catenation, ...). Other compilers will have their own way of dealing
> with this.

I've never heard about VxWorks before. It is a real time OS, as said
Yahoo search.

A note on Windows which tells to be careful when using GetLastError:

> It is not possible to use GetLastError and SetLastError when tasking,
> protected records, or exceptions are used. In these cases, in order to
> implement Ada semantics, the GNAT run-time system calls certain Win32 routines
> that set the last error variable to 0 upon success. It should be possible to
> use GetLastError and SetLastError when tasking, protected record, and
> exception features are not used, but it is not guaranteed to work.

http://www.adacore.com/wp-content/files/auto_update/gnat-unw-docs/html/gnat_ugn_36.html

By the ways, I'm looking for the best way to do coroutines with Ada,
without tasking (none-recursive coroutines, so no separate stack is
needed, just global storage for local variables). Yes, this can be
achieved with a select/when statement and a state enumeration, but
this way is not very clean nor nice.