Date: Mon, 25 Apr 2005 19:56:35 +0200 From: Divacky Roman <xdivac02@stud.fit.vutbr.cz> To: Ron Chen <ron_chen_123@yahoo.com> Cc: freebsd-hackers@freebsd.org Subject: Re: C-style expression processing... Message-ID: <20050425175635.GA7617@stud.fit.vutbr.cz> In-Reply-To: <20050425055016.56609.qmail@web41303.mail.yahoo.com> References: <20050425055016.56609.qmail@web41303.mail.yahoo.com>
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On Sun, Apr 24, 2005 at 10:50:16PM -0700, Ron Chen wrote: > Hi, > > I am trying to add a new feature in Gridengine > (free/opensource) to support ex-LSF users - there are > more and more LSF users migrating to Gridengine), and > some requested this one: > > In LSF, a user can specify from the command line the > resource requirements of a batch job: > > (mem >= 100 || pg < 200.0) > > Where mem and pg are variables (they changes in time, > and the master cluster scheduler has the most > up-to-date information). And what I need is to find > out whether the expression is true or not. > > My question is, is there an expression processing > library that can handle complex equations easily? you can easily parse it, using yacc/lex... and even hand-writing such parser cannot be difficult..
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