This is the mail archive of the newlib@sourceware.org mailing list for the newlib project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: REENT_SMALL

From: Jeff Johnston <jjohnstn at redhat dot com>
To: Raphael Derosso Pereira <raphaelpereira at gmail dot com>
Cc: newlib at sources dot redhat dot com
Date: Thu, 27 Nov 2008 17:25:35 -0500
Subject: Re: REENT_SMALL
References: <f20381800811271028k3942065fo855ddf35bc54bc3a@mail.gmail.com>

Raphael Derosso Pereira wrote:

Hello,
I would like to know what is the size difference between the normal
reent structure and the small reent structure?
Best Regards,

-- Raphael Derosso Pereira Engenheiro de Computação icq: 4517421 msn: rderossopereira@hotmail.com Skype: rderossopereira

To figure it out, just print sizeof(struct _reent) with one of the standard headers included. Then do it again with #define _REENT_SMALL defined at the top.

The normal reent structure is currently 1120 bytes and the small version is 240 bytes to start. The _REENT_SMALL version grows dynamically as features are used and due to this there is often an extra level of indirection accessing fields. It really is meant for extremely small platforms with little memory to spare.

-- Jeff J.

Follow-Ups:
- Re: REENT_SMALL
  - From: Raphael Derosso Pereira

References:
- REENT_SMALL
  - From: Raphael Derosso Pereira

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]