Re: non-preemptive tasking on GNAT 2020 Windows 10 multicore AMD

[Dennis Lee Bieber <wlfraed@ix.netcom.com>]

On Sat, 12 Jun 2021 21:24:58 -0400, Dennis Lee Bieber
<wlfraed@ix.netcom.com> declaimed the following:

>	I suspect part of the problem may be that the GNAT runtime defers to
>the OS for how tasks (threads/processes) are implemented (AdaCore probably

	Also see
https://docs.adacore.com/gnat_ugn-docs/html/gnat_ugn/gnat_ugn/platform_specific_information.html

"""
Choosing the Scheduling Policy

When using a POSIX threads implementation, you have a choice of several
scheduling policies: SCHED_FIFO, SCHED_RR and SCHED_OTHER.
"""
	Unfortunately -- POSIX threads means, I believe, pthreads library...
That is not native on Windows, just Linux and Mac... Don't know if

"""
wPOSIX

wPOSIX is a minimal POSIX binding whose goal is to help with building
cross-platforms applications. This binding is not complete though, as the
Win32 API does not provide the necessary support for all POSIX APIs.

To use the wPOSIX binding you need to use a project file, and adding a
single with_clause will give you full access to the wPOSIX binding sources
and ensure that the proper libraries are passed to the linker.

    with "wposix";
    project P is
       for Sources use ...;
    end P;

To build the application you just need to call gprbuild for the
application’s project, here p.gpr:

    gprbuild p.gpr
"""

is sufficient to get POSIX threading... I don't see anything in
https://github.com/AdaCore/wposix/tree/master/src that seems specific to
threading



-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
	wlfraed@ix.netcom.com    http://wlfraed.microdiversity.freeddns.org/