Date: Wed, 21 Jul 1999 16:20:48 -0700 From: "Jeff Hagendaz" <jeffhdz@my-Deja.com> To: freebsd-questions@freebsd.org Subject: polling in device driver Message-ID: <BALPOCGFGEOOBAAA@my-deja.com>
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Hi,
I asked this in -hackers, but didn't get an answer.
Guess it is too simple to quanlify into -hackers,
I am moving it here. Your help is highly appreciated.
-- Jeff
Hi,
I am reading a Linux device driver. At some point it
polls a device to check if it is ready. The timeout
is set to 5 second. It uses the system jiffies to
count the time:
u32 time_out = jiffies + 5 * HZ;
for (;;) {
/* code to check if dev is ready */
........
if (ready) break;
if (intr_count == 0) schedule();
if (jiffies > time_out) return ERROR;
}
How do I implement such polling in FreeBSD? Thanks.
--Jeff
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