From: cinap_lenrek@gmx.de
To: 9fans@9fans.net
Subject: Re: [9fans] devmnt crash, fix.
Date: Thu, 23 Aug 2012 11:47:14 +0200 [thread overview]
Message-ID: <ddde182808bdb363b6ed3c1501cbea21@rei2.9hal> (raw)
In-Reply-To: <2558025d29ad87b629bc88c6e6a043a3@kw.quanstro.net>
can you provide the source file, dont have current 9atom iso handy
and the stuff i found on the net doesnt seem to cut it. however,
i found http://www.quanstro.net/plan9/sleepwake.html which at the
end gives a solution to the problem:
void
dowake(Io *i)
{
i->cond = 1;
wakeup(i);
i->cond = 2; /* atomic */
/* hands off i now */
}
void
doio(void)
{
Io *i;
dispatch(i = malloc(sizeof *i));
while(waserror())
/* eat note */;
sleep(i, iodone, i);
poperror();
while(i->cond != 2)
/* rendez not done */;
free(i);
}
that would be relatively easy to apply to devmnt and doesnt have the
problem of spurious wakeups with abusing up->sleep as rendez.
--
cinap
next prev parent reply other threads:[~2012-08-23 9:47 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-22 18:53 erik quanstrom
2012-08-22 19:09 ` cinap_lenrek
2012-08-22 19:12 ` cinap_lenrek
2012-08-22 19:53 ` cinap_lenrek
2012-08-22 22:26 ` erik quanstrom
2012-08-22 23:30 ` cinap_lenrek
2012-08-23 1:53 ` erik quanstrom
2012-08-23 9:47 ` cinap_lenrek [this message]
2012-08-23 13:27 ` erik quanstrom
2012-08-23 15:02 ` cinap_lenrek
2012-08-23 15:39 ` Bakul Shah
2012-08-23 15:48 ` erik quanstrom
2012-08-23 15:53 ` cinap_lenrek
2012-08-23 16:06 ` erik quanstrom
2012-08-23 16:18 ` cinap_lenrek
2012-08-23 16:24 ` erik quanstrom
2012-08-23 16:47 ` Charles Forsyth
2012-08-23 17:01 ` cinap_lenrek
2012-08-23 17:53 ` Bakul Shah
2012-08-23 18:03 ` erik quanstrom
[not found] ` <CAOw7k5ii5PoYZnEbDeUuhR9GsgEEGt7i+XTQm7FR9+r=ENg=xw@mail.gmail.c>
2012-08-23 17:09 ` erik quanstrom
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