Add SGX runtime (#963)

apps/sgx/tvm_runtime_pack.cc

@@ -5,13 +5,7 @@
  *   Please refer to the Makefile (rule lib/tvm_runtime_pack.o) for how to build.
  *
  */
-#include "../../src/runtime/c_runtime_api.cc"
-#include "../../src/runtime/cpu_device_api.cc"
-#include "../../src/runtime/workspace_pool.cc"
-#include "../../src/runtime/module_util.cc"
-#include "../../src/runtime/module.cc"
-#include "../../src/runtime/registry.cc"
-#include "../../src/runtime/system_lib_module.cc"
+#include "../../sgx/sgx_runtime.cc"
 #ifndef _LIBCPP_SGX_CONFIG
 #include "../../src/runtime/file_util.cc"
 #endif

sgx/sgx_runtime.cc

+/*!
+ *  Copyright (c) 2018 by Contributors
+ * \file sgx_runtime.cc
+ */
+#include "../../src/runtime/c_runtime_api.cc"
+#include "../../src/runtime/cpu_device_api.cc"
+#include "../../src/runtime/workspace_pool.cc"
+#include "../../src/runtime/module_util.cc"
+#include "../../src/runtime/module.cc"
+#include "../../src/runtime/registry.cc"
+#include "../../src/runtime/system_lib_module.cc"
+
+// dummy parallel runtime
+int TVMBackendParallelLaunch(
+    FTVMParallelLambda flambda,
+    void* cdata,
+    int num_task) {
+  TVMAPISetLastError("Parallel is not (yet) supported in SGX runtime");
+  return -1;
+}
+
+int TVMBackendParallelBarrier(int task_id, TVMParallelGroupEnv* penv) {
+  return 0;
+}
+