[gem5-dev] Change in gem5/gem5[master]: systemc: Make sc_main run in its own fiber.

[Gabe Black (Gerrit)]

Gabe Black has uploaded this change for review. (  
https://gem5-review.googlesource.com/10849

Change subject: systemc: Make sc_main run in its own fiber.
......................................................................

systemc: Make sc_main run in its own fiber.

The fiber will run until either sc_main returns, or until sc_start is
called. If sc_start is called, then the fiber will only be paused and
waiting for simulation cycles to be run by gem5. Once sc_pause and
sc_stop are implemented, if those are called the sc_main fiber will
be re-entered and allowed to run further towards completion.

Change-Id: I4df94f4f6fed8d49471732619a203d734d9a13a6
---
M src/systemc/core/sc_main.cc
1 file changed, 29 insertions(+), 4 deletions(-)



diff --git a/src/systemc/core/sc_main.cc b/src/systemc/core/sc_main.cc
index 815be9b..737022b 100644
--- a/src/systemc/core/sc_main.cc
+++ b/src/systemc/core/sc_main.cc
@@ -30,8 +30,11 @@
 #include <cstring>

 #include "base/logging.hh"
+#include "base/types.hh"
 #include "python/pybind11/pybind.hh"
+#include "sim/eventq.hh"
 #include "sim/init.hh"
+#include "systemc/core/fiber.hh"
 #include "systemc/ext/core/sc_main.hh"
 #include "systemc/ext/utils/sc_report_handler.hh"

@@ -57,6 +60,17 @@
 int _argc = 0;
 char **_argv = NULL;

+class ScMainFiber : public SystemC::Fiber
+{
+    void
+    main()
+    {
+        ::sc_main(_argc, _argv);
+    }
+};
+
+ScMainFiber scMainFiber;
+
 // This wrapper adapts the python version of sc_main to the c++ version.
 void
 sc_main(pybind11::args args)
@@ -94,8 +108,7 @@
     // again later.
     scMainCalled = true;

-    //TODO Start a new fiber to call sc_main from.
-    ::sc_main(_argc, _argv);
+    scMainFiber.run();
 }

 // Make our sc_main wrapper available in the internal _m5 python module  
under
@@ -111,6 +124,9 @@
 sc_stop_mode _stop_mode = SC_STOP_FINISH_DELTA;
 sc_status _status = SC_ELABORATION;

+Tick _max_tick = MaxTick;
+sc_starvation_policy _starvation = SC_EXIT_ON_STARVATION;
+
 uint64_t _deltaCycles = 0;

 } // anonymous namespace
@@ -130,13 +146,22 @@
 void
 sc_start()
 {
-    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    _max_tick = MaxTick;
+    _starvation = SC_EXIT_ON_STARVATION;
+
+    // Switch back gem5.
+    SystemC::gem5Fiber()->run();
 }

 void
 sc_start(const sc_time &time, sc_starvation_policy p)
 {
-    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    Tick now = curEventQueue() ? curEventQueue()->getCurTick() : 0;
+    _max_tick = now + time.value();
+    _starvation = p;
+
+    // Switch back to gem5.
+    SystemC::gem5Fiber()->run();
 }

 void

--
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Gerrit-Project: public/gem5
Gerrit-Branch: master
Gerrit-Change-Id: I4df94f4f6fed8d49471732619a203d734d9a13a6
Gerrit-Change-Number: 10849
Gerrit-PatchSet: 1
Gerrit-Owner: Gabe Black <gabebl...@google.com>
Gerrit-MessageType: newchange
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