From mboxrd@z Thu Jan  1 00:00:00 1970
MIME-Version: 1.0
From: Venkatesh Srinivas <me@acm.jhu.edu>
Date: Wed,  9 Dec 2009 11:55:26 -0500
Message-ID: <f75780240912090855n66c588dw200016754ad3cc8b@mail.gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Content-Type: text/plain; charset=UTF-8
Subject: [9fans] port/allocb.c question
Topicbox-Message-UUID: ade64ef8-ead5-11e9-9d60-3106f5b1d025

Hi,

In _allocb() in port/allocb.c, there is an _xinc(&b->ref) on a long
inside the Block header. No one else ought have a pointer to this
block yet, seeing as its not done being allocated. Is there any reason
a locked increment is being used?

-- vs