X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;ds=sidebyside;f=mpmc-queue%2Fmpmc-queue.h;h=47af8eab37b7509ca8e257e118c5b7e38ec8278a;hb=5ab6d890042234648c0baec333ed65e90ca055cf;hp=dc2b5618771774238c1c16f97efa87262da182a4;hpb=9f2a28f12f61001be2bd5adc74964acf5e8e6721;p=model-checker-benchmarks.git

diff --git a/mpmc-queue/mpmc-queue.h b/mpmc-queue/mpmc-queue.h
index dc2b561..47af8ea 100644
--- a/mpmc-queue/mpmc-queue.h
+++ b/mpmc-queue/mpmc-queue.h
@@ -34,10 +34,12 @@ public:
 			wr = rdwr & 0xFFFF;
 
 			if ( wr == rd ) // empty
-				return false;
+				return NULL;
 
 			if ( m_rdwr.compare_exchange_weak(rdwr,rdwr+(1<<16),mo_acq_rel) )
 				break;
+			else
+				thrd_yield();
 		}
 
 		// (*1)
@@ -69,6 +71,8 @@ public:
 
 			if ( m_rdwr.compare_exchange_weak(rdwr,(rd<<16) | ((wr+1)&0xFFFF),mo_acq_rel) )
 				break;
+			else
+				thrd_yield();
 		}
 
 		// (*1)