From: Martin Hunt <hunt@redhat.com>
To: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>, systemtap@sourceware.org
Subject: Re: Global constants
Date: Mon, 13 Feb 2006 19:40:00 -0000 [thread overview]
Message-ID: <1139859707.3942.11.camel@monkey2> (raw)
In-Reply-To: <y0md5hrrrbt.fsf@ton.toronto.redhat.com>
On Mon, 2006-02-13 at 14:28 -0500, Frank Ch. Eigler wrote:
> The standard syscalls tapset should define such constants, so end-user
> scripts do not have to.
Hien and I are currently rewriting the syscall tapset, so if constants
get implemented soon, we can make immediate use of them.
> If read-only-ness of these globals is important, then a new "const"
> keyword would indeed come in handy. (I'd promptly reuse it as a
> qualifier for embedded-C functions that are declared to have no
> side-effects.) I would implement this angle by a new flag on vardecl,
> enforced non-lvalueness during elaboration or translation, rather than
> whole new staptree.h classes.
Declaring variables readonly reduces the probe complexity by removing
the global locks around all variable access. So it clearly seems like a
win.
Also it would be nice to have a way to declare these constants in
embedded C, so we can use the C header files to get the values, rather
than look them up.
something like
%{ const_O_CREAT = O_CREAT; %}
instead of
O_CREAT = 64
next prev parent reply other threads:[~2006-02-13 19:40 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-13 17:39 Mark McLoughlin
2006-02-13 19:28 ` Frank Ch. Eigler
2006-02-13 19:40 ` Martin Hunt [this message]
2006-02-13 20:10 ` Frank Ch. Eigler
2006-02-13 20:20 ` Mark McLoughlin
2006-02-13 20:14 ` Mark McLoughlin
2006-02-13 20:22 ` Martin Hunt
2006-02-13 20:44 ` Mark McLoughlin
2006-02-13 21:41 ` Martin Hunt
2006-02-14 8:27 ` Mark McLoughlin
2006-02-13 20:09 ` Mark McLoughlin
2006-02-13 20:13 Stone, Joshua I
2006-02-13 20:46 ` Frank Ch. Eigler
2006-02-13 20:36 Stone, Joshua I
2006-02-13 21:05 ` Frank Ch. Eigler
2006-02-13 21:50 Stone, Joshua I
2006-02-13 23:50 ` Frank Ch. Eigler
2006-02-13 22:12 Stone, Joshua I
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