Date: Mon, 3 Jun 1996 13:32:24 +0200 (MET DST) From: Nicolas.Souchu@prism.uvsq.fr (Nicolas SOUCHU) To: hackers@freebsd.org Subject: How to preempt the current process ? Message-ID: <199606031132.NAA00333@angrand.prism.uvsq.fr>
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An adapter that does not support interrupts must be polled. Then when
data is not available, I want the current process to be preempted
without sleeping, just scheduled (its state remains SRUN).
Is that enough? :
s = splhigh ();
mi_switch ();
curpriority = p->p_usrpri;
splx (s);
This is the sleep() code without queueing the process with
state=SSLEEP.
Secondly,
what does mean :
__asm__ ("":::"memory") ?
This is the macro 'barrier()' in Linux.
Thanks in advance...
nicolas
--
Nicolas.Souchu@prism.uvsq.fr
Laboratoire PRiSM - Versailles, FRANCE
http://www.prism.uvsq.fr/public/son
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