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Subject: Re: "spinlock" API
From: Andrew Johnson <anj@aps.anl.gov>
To: core-talk@aps.anl.gov, mdavidsaver@bnl.gov
Date: Fri, 8 Jun 2012 14:48:46 -0500
Hi Michael,

On 2012-06-07 Michael Davidsaver wrote:
> 
> For the implementation of thread pool I would like to allow it to be
> used from interrupt context on RTEMS/vxworks.  So it should need to use
> epicsInterruptLock().  I want to avoid using a global lock on
> Linux/Windows/etc.
> 
> Now I could implement this internally for the thread pool only, but I
> thought I would float the possibility of creating a proper spin lock
> API.  Initially RTEMS/vxworks would implement this using epicsInterrupt
> and the default implement would use epicsMutex.

Have you looked at the epicsAtomicLock() and epicsAtomicUnlock() routines that 
Jeff uses in some of his epicsAtomic implementations?  You might have to write 
RTEMS-specific versions, but they do seem to be implementing the functionality 
you're after; on vxWorks they use intLock().  This would mean promoting these 
routines to an official API (and possibly moving or renaming them), but I 
wouldn't have a problem with that.

- Andrew
-- 
Never interrupt your enemy when he is making a mistake.
-- Napoleon Bonaparte

Replies:
Re: "spinlock" API Michael Davidsaver
References:
"spinlock" API Michael Davidsaver

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