Merge pull request #470 from guru4elephant/bthread_memory_problem

fix gpu memory explosion problem when bthread is used

core/predictor/common/macros.h

@@ -27,6 +27,10 @@ namespace predictor {
   }
 #endif
 
+#ifdef WITH_GPU
+#define USE_PTHREAD
+#endif
+
 #ifdef USE_PTHREAD
 
 #define THREAD_T pthread_t