From:	Alain Magloire <alainm AT rcsm DOT ece DOT mcgill DOT ca>
Message-Id:	<199904151734.NAA15732@mccoy2.ECE.McGill.CA>
Subject:	Re: v2.x release: features ?
To:	eliz AT is DOT elta DOT co DOT il (Eli Zaretskii)
Date:	Thu, 15 Apr 1999 13:34:06 -0400 (EDT)
Cc:	djgpp-workers AT delorie DOT com
In-Reply-To:	<Pine.SUN.3.91.990415140005.26213n@is> from "Eli Zaretskii" at Apr 15, 99 02:00:25 pm
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Bonjour M. Eli Zaretskii

> 
> On Wed, 14 Apr 1999, Alain Magloire wrote:
> 
> > Is there major projects ahead for the core DJGPP/libc ?
> 
> IMHO, you just covered about everything.  There are quite a few minor
> features and improvements, but I can't think of any other major ones.
> 

There are a couple of others but some may not mean much in a single task
environment.

Virtual Memory, file mapping :
mmap(), munmap(), mlock(), mlockall() ,...

IPC: semaphores, message queues, shared memory
Maybe only usefull with some multitasking even if crude/raw/minimalist.

Asynch I/O.

> But I guess we didn't discuss this for a very long time, so now might
> be as good as ever.  If anybody has more missing features in mind,
> please speak up (and don't forget to volunteer to implement some ;-).
> 

Threading is an interesting topic :
- There's the ubiquitous ``errno''.
- stdio API :
    - void flockfile(FILE *);
    - int ftrylockfile(File *);
    - void funlockfile(FILE *);
    - int getc_unlocked(FILE *);
    - int getc_unlocked(void);
    - int putc_unlocked(int, File *);
    - int putchar_unlocked(int);

    So some functions should grab the lock stream before.
    For example if fflush() is not thread-safe
    int fflush(FILE * stream)
    {
	if (stream) {
		flockfile(stream);
		.....
		funlockfile(stream);
	}
	...
    }

- C lib reentrant interface :
    - getlogin_r
    - readir_r
    - strtock_r
    - asctime_r
    - ctime_r
    - gmtime_r
    - localtime_r
    - rand_r
    - getgrpid_r
    - getgrnam_r
    - getpwuid_r
    - getpwnam_r

- Audit the src some funcs may be implemented in non-thread safe manner.
malloc/calloc/realloc/free comes to mind.

-- 
au revoir, alain
----
Aussi haut que l'on soit assis, on est toujours assis que sur son cul !!!

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