From mboxrd@z Thu Jan  1 00:00:00 1970
From: daniel.baluta@gmail.com (Daniel Baluta)
Date: Mon, 4 Apr 2011 12:45:20 +0300
Subject: query regarding kernel daemon
In-Reply-To: <BANLkTim6StdO_DFJC+L=baWXwm25fNm=XA@mail.gmail.com>
References: <BANLkTim6StdO_DFJC+L=baWXwm25fNm=XA@mail.gmail.com>
Message-ID: <BANLkTimFnBhnad33SqqqOGykBf=hO3GkXQ@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

> A daemon sleeps in the background. User can enter a string through the proc
> interface. Whenever a string is entered, the daemon is woke. The daemon
> keeps a copy of the last entered string in a variable. Initially the
> variable is initialized to NULL. When the daemon wakes, it checks if the
> string entered is same as the previous one or a new string is entered. When
> the string is entered, in case the new or the old strings are NULL, or in
> case the entered string is same as the old string the daemon goes back to
> sleep (with the help of the function interruptible_sleep_on().

Don't use interruptible_sleep_on use wait_event* instead.

thanks,
Daniel.

[1] http://lxr.linux.no/linux+v2.6.38/include/linux/wait.h#L570