Re: [ECOS] Detect if scheduler locked?

[Gary Thomas <gthomas at ecoscentric dot com>]

On Tue, 2002-10-22 at 09:20, Grant Edwards wrote:
> 
> I'm trying to make a function work properly if called when the
> scheduler is locked.  
> 
> In order to do this right, the function needs to know whether
> it can call cyg_thread_delay().  If the scheduler is locked, it
> will have to use some sort of delay loop rather than call
> cyg_thread_delay().  It would be trivial to get it would work
> right if cyg_current_time() continued to increment while the
> scheduler was locked, but it doesn't (probaby requires the
> timer DSR to run).
> 
> How does application code determine if the scheduler is locked?
> 

You can use this (in KAPI):
	/* Read the scheduler lock value. */
	externC cyg_ucount32 cyg_scheduler_read_lock(void)

Of course, I'd question what you are doing anyway.  If this
[thread] needs to wait for some period of time, I'd argue that
if it's a long enough time (10's of milliseconds by default)
to use 'cyg_thread_delay()', then you probably shouldn't be
doing it with the scheduler locked anyway - since nothing else
can run.

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Gary Thomas                  |
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