Re: locking in a device driver

From: Dinesh Nair (dinesh_at_alphaque.com)
Date: 10/27/05

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    Date: Fri, 28 Oct 2005 00:46:03 +0800
To: Scott Long <scottl@samsco.org>

    On 10/27/05 22:00 Scott Long said the following:
    > are doing. Other than that, there likely isn't anything that you need
    > to do for 'locking' in 4.x. The kernel is non-reentrant there, so you
    > don't need to worry about synchronizing multiple threads.

    thanx a bunch, scott. it's been a nightmare trying to debug the driver and
    to try to find out why the driver compiled from the same source tree works
    on freebsd 5.x and doesnt work at all on freebsd 4.x . so far, i've been
    gloriously unsuccesful at this, and am getting at my wits end on what to go
    look at.

    the userland application uses pthreads, and works like a charm both on 4.x
    and 5.x without using the device. however, when the device is used, it
    somehow has synchronization errors on 4.x, leading to timers (created in
    the userland app) timing out and the like. 

    -- 
Regards,                           /\_/\   "All dogs go to heaven."
dinesh@alphaque.com                (0 0)    http://www.alphaque.com/
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