make warnings go away

[model-checker-benchmarks.git] / mpmc-queue / mpmc-queue.h

diff --git a/mpmc-queue/mpmc-queue.h b/mpmc-queue/mpmc-queue.h
index dc2b5618771774238c1c16f97efa87262da182a4..47af8eab37b7509ca8e257e118c5b7e38ec8278a 100644 (file)
--- 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)