[Cbe-oss-dev] [PATCH 2/5] MARS: yield in task event flag wait busy loop

[Yuji Mano]

Call sched_yield() inside the busy loop on the host-side
to wait for task event flag bits to be set. This allows
other processes to run more generously on the host while
waiting in the busy loop.

Signed-off-by: Yuji Mano <yuji.mano at am.sony.com>

---
 src/host/lib/mars_task_event_flag.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/src/host/lib/mars_task_event_flag.c
+++ b/src/host/lib/mars_task_event_flag.c
@@ -35,6 +35,8 @@
  * LIBRARY OR THE USE OR OTHER DEALINGS IN THE LIBRARY.
  */
 
+#include <sched.h>
+
 #include "mars/mars_task_event_flag.h"
 #include "mars/mars_workload_queue.h"
 #include "mars/mars.h"
@@ -173,14 +175,12 @@ int mars_task_event_flag_wait(struct mar
 		/* check condition based on wait mode */
 		switch (mask_mode) {
 		case MARS_TASK_EVENT_FLAG_MASK_OR:
-			while ((*(volatile uint32_t *)
-				&event_flag->bits | mask) == 0) {
-			}
+			while ((event_flag->bits | mask) == 0)
+				sched_yield();
 			break;
 		case MARS_TASK_EVENT_FLAG_MASK_AND:
-			while ((*(volatile uint32_t *)
-				&event_flag->bits & mask) != mask) {
-			}
+			while ((event_flag->bits & mask) != mask)
+				sched_yield();
 			break;
 		}