X-Git-Url: http://rtime.felk.cvut.cz/gitweb/lincan.git/blobdiff_plain/341377103dfdc83d2d52e33d78672366db0efe93..5b1805652b70bcf8f56c827e09b18fbf5a77bea6:/lincan/include/can_queue.h

diff --git a/lincan/include/can_queue.h b/lincan/include/can_queue.h
index 00ac94c..bf9486d 100644
--- a/lincan/include/can_queue.h
+++ b/lincan/include/can_queue.h
@@ -646,11 +646,13 @@ void canque_edge_decref(struct canque_edge_t *edge)
 		if(x<=1)
 			return __canque_edge_decref(edge);
 		y=x;
+	    #ifdef CAN_HAVE_ATOMIC_CMPXCHG
+		atomic_cmpxchg(&edge->edge_used, x, x-1);
+	    #else /* workaround for case that atomic_cmpxchg is not defined */
 		/* This code strongly depends on the definition of atomic_t !!!! */
-		/* x=cmpxchg(&edge->edge_used, x, x-1); */
-		/* Next alternative could be more portable */
 		x=__cmpxchg(&edge->edge_used, x, x-1, sizeof(atomic_t));
 		/* If even this does not help, comment out CAN_HAVE_ARCH_CMPXCHG in can_sysdep.h */
+	    #endif
 	} while(x!=y);
 }
 #endif