[ECOS] at91 SPI driver, use of cyg_drv_dsr_lock()

Peter Kooiman pkooiman@multimediabit.com
Mon Mar 20 13:29:00 GMT 2006


Gary Thomas wrote:
> cyg_drv_dsr_lock() only prevents DSRs until the thread gives up the CPU
> or cyg_drv_dsr_unlock() is called.  In this case, if the thread decides
> tp call cyg_drv_cond_wait(), then the DSR lock is dropped.  Once the DSR
> runs and signals the condition variable, the thread is resumed - *with*
> DSRs locked again.  Once the thread exits the 'while()' loop, the DSR
> lock will once again be dropped.

Aaaaah, so the DSR lock-state is really a per-thread state, cool! 
Thanks Gary

Peter Kooiman




-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss



More information about the Ecos-discuss mailing list