Added configuration option for hard realtime

The cmake configuration option HARD_REALTIME was added. This sets or
unsets the compile time variable EMBB_HARD_REALTIME.

CMakeLists.txt

@@ -85,6 +85,7 @@ option(INSTALL_DOCS "Specify whether Doxygen docs should be installed" ON)
 option(WARNINGS_ARE_ERRORS "Specify whether warnings should be treated as errors" OFF)
 option(USE_AUTOMATIC_INITIALIZATION "Specify whether the MTAPI C++ interface, algorithms and dataflow should automatically intialize the MTAPI node if no explicit initialization is present" ON)
 option(BUILD_OPENCL_PLUGIN "Specify whether the MTAPI OpenCL plugin should be built" OFF)
+option(HARD_REALTIME "Specify whether hard real-time scheduling should be activated" ON)
 
 ## LOCAL INSTALLATION OF SUBPROJECT BINARIES
 #
@@ -149,6 +150,10 @@ if(CUDA_FOUND)
   list(APPEND EXPECTED_EMBB_TEST_EXECUTABLES "embb_mtapi_cuda_c_test")
 endif()
 
+# Adding hard real-time support with slightly different scheduling
+if(HARD_REALTIME STREQUAL ON)
+  set(EMBB_HARD_REALTIME 1)
+endif()
 
 ## Copy test execution script to local binaries folder
 

base_c/include/embb/base/c/internal/cmake_config.h.in

@@ -53,6 +53,12 @@
  */
 #cmakedefine EMBB_PLATFORM_HAS_GLIB_CPU
 
+/**
+ * If defined, instead of the MTAPI round-robin work-stealing scheduling with
+ * local queues per priority, global edf is used for scheduling in order to
+ * guarantee hard real-time bounds.
+ */
+#cmakedefine EMBB_HARD_REALTIME
 
 #define EMBB_BASE_VERSION_MAJOR ${EMBB_BASE_VERSION_MAJOR}
 #define EMBB_BASE_VERSION_MINOR ${EMBB_BASE_VERSION_MINOR}