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From: Kaz Kylheku <643-408-1753@kylheku.com>
Newsgroups: comp.lang.c
Subject: Re: best approach for multithreading (?)
Date: Fri, 6 Dec 2024 18:20:54 -0000 (UTC)
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On 2024-12-06, Scott Lurndal <scott@slp53.sl.home> wrote:
> Kaz Kylheku <643-408-1753@kylheku.com> writes:
>>On 2024-12-06, James Kuyper <jameskuyper@alumni.caltech.edu> wrote:
>>> On 12/3/24 12:48, Kaz Kylheku wrote:
>>> ...
>>>> Think about it. The POSIX standard includes ISO C by reference.
>>>> So that means POSIX has to have two thread libraries.
>>>> It's a waste of flash in embedded systems.
>>>
>>> C <threads.h> can be implemented as a thin wrapper over POSIX threads.
>>> The waste is relatively negligible. The differences, were intended to
>>> allow <threads.h> to also be implemented on non-POSIX systems as
>>> wrappers for whatever the native threading system was.
>>
>>Generally speaking, you can have a function called pthread_create on
>>non-POSIX systems, and a header <pthread.h>.
>
> There are certain requirements of a posix threads implementation that
> might be impossible for a non-POSIX system to implement efficiently;
> windows, for example, doesn't support signals.

It's better to remove requirements from the POSIX standard to implement
a useful subset of POSIX threads, than to remove requirements from POSIX
threads and then change all the names to ISO C threads, to create a
redundant specification.

-- 
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