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Commit 5c9be402 authored by Mathias Agopian's avatar Mathias Agopian
Browse files

Add a priority constant in to the graphics HAL header 

this is needed if a display/gpu driver needs to create
service threads that can block the main ui thread.
to avoid priority inversions, these must run at
HAL_PRIORITY_URGENT_DISPLAY

Change-Id: I3af592e05a6d1b6f39a2b7885a7c842e54abfce2
parent 5d5816c4

include/system/graphics.h

+14 −0
Original line number Diff line number Diff line
@@ -19,6 +19,20 @@ 


__BEGIN_DECLS



/*

 * If the HAL needs to create service threads to handle graphics related

 * tasks, these threads need to run at HAL_PRIORITY_URGENT_DISPLAY priority

 * if they can block the main rendering thread in any way.

 *

 * the priority of the current thread can be set with:

 *

 *      #include <sys/resource.h>

 *      setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);

 *

 */



#define HAL_PRIORITY_URGENT_DISPLAY     (-8)



/**

 * pixel format definitions

 */