Mailing-List: contact cygwin-apps-help AT sourceware DOT cygnus DOT com; run by ezmlm
Sender: cygwin-apps-owner AT sourceware DOT cygnus DOT com
List-Subscribe: <mailto:cygwin-apps-subscribe AT sources DOT redhat DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin-apps/>
List-Post: <mailto:cygwin-apps AT sources DOT redhat DOT com>
List-Help: <mailto:cygwin-apps-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/lists.html#faqs>
Delivered-To: mailing list cygwin-apps AT sources DOT redhat DOT com
X-Authentication-Warning: hp2.xraylith.wisc.edu: khan owned process doing -bs
Date: Mon, 26 Mar 2001 17:10:38 -0600 (CST)
From: Mumit Khan <khan AT NanoTech DOT Wisc DOT EDU>
To: Heribert Dahms <heribert_dahms AT icon-gmbh DOT de>
cc: cygwin-apps AT cygwin DOT com, cygwin AT cygwin DOT com
Subject: RE: pthreads support
In-Reply-To: <BF35D9C143BCCC4EB63181B67C9320C804DD64@serv-075.icon-germany.local>
Message-ID: <Pine.HPP.3.96.1010326170349.16861B-100000@hp2.xraylith.wisc.edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Mon, 26 Mar 2001, Heribert Dahms wrote:

> can you please give a short description or URL
> about what multithreading gcc would use?
> I always thought that only the worker subprocesses
> (cpp, cc1, ld, as) of the compiler driver may run
> concurrently!

The GCC compilers and drivers are not multi-threaded, so you get no
benefit from that. The multi-threading interface in gcc is needed to
support thread-safe C++ exceptions (Java may need it too, but I know
next to nothing about the GCC Java front-end). Currently supported
interfaces are single (default for Cygwin for example), POSIX, Windows32, 
DCE, and vxWorks. The Mingw compiler uses the Windows32, which, with a 
slight change [1], it'll work with Cygwin as well, but I believe it'll 
be better to avoid that and work on getting pthreads interface to work.

[1] In that case, you'll also need a helper DLL that every MT C++ code
links with, or need to add a small bit of code to Cygwin.

Regards,
Mumit