From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=0.2 required=5.0 tests=BAYES_00,INVALID_MSGID,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,5d05ccde5cefb836
X-Google-Attributes: gid103376,public
From: Mats Weber <Mats.Weber@elca-matrix.ch>
Subject: Re: Tasks and C/C++ code.
Date: 1998/11/09
Message-ID: <3647052F.30852169@elca-matrix.ch>#1/1
X-Deja-AN: 409955184
Content-Transfer-Encoding: 7bit
References: <364702E5.F6987321@hiwaay.net>
X-Accept-Language: en
Content-Type: text/plain; charset=us-ascii
Organization: ELCA Matrix SA
Mime-Version: 1.0
Reply-To: Mats.Weber@elca-matrix.ch
Newsgroups: comp.lang.ada
Date: 1998-11-09T00:00:00+00:00
List-Id: <comp.lang.ada>

"Barry L. Dorough" wrote:
> 
>     I am working on a project where we need to call the same C function
> from multiple tasks.  I am wondering how to do this safely.  Can I make
> a generic with my C pragma defined there are do I need to define the
> prama in the task type so each task will have its own copy of the C
> function.

Doing it either way won't change anything, the result will be exactly
the same: there will be only one copy of the C function, possibly being
called concurrently by more than one Ada task.

What you have to make sure is that your C function is task-safe, or
thread-safe in the pthreads terminology. Look at its use of global
variables and non thread-safe system calls, among others (e.g.
gethostbyname is generally not thread-safe).