Indeed: the real answer is to use fast primitives inside
your fcntl lock code (;-))
--dave
Jeremy Allison wrote:
On Sun, Apr 23, 2006 at 04:27:21PM -0400, David Collier-Brown wrote:
You can always check for a dead process if you save the
pid of the process which holds the lock. Alas, this
is a slow operation, involving calling kill(pid, 0),
two process switches and a return. As you
do relinquish the processor, that's not actually
evil, but is it something that conceivably could slow
you as much as the fcntl (;-))
From some old measurements on my Sun, I **think** it's
faster than **my** fcntl... I really need to remeasure
with Solaris 10.
There's always a race though. You can crash after
you get the lock but before you write your own
PID. It's not atomic - for that you need kernel
support.
Jeremy.
--
David Collier-Brown, | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
[EMAIL PROTECTED] | -- Mark Twain
(416) 223-5943
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