systemc: Refactor sensitivities.

Dynamic and Static sensitivities used to be represented by the same
classes, even though they're (almost) disjoint in how they worked. Also
timeouts, which can be used alongside dynamic sensitivities, were
handled by the sensitivities themselves. That meant that the
sensitivity mechanism had to mix in more types of behaviors,
increasing complexity. Also, the non-standard timed_out function
Accellera includes is harder to implement if the path for timeouts and
regular sensitivities are mixed together.

This change splits up dynamic and static sensitivities and splits out
timeouts. It also immitates the ordering Accellera uses when going
through sensitivities for an event. Static sensitivities are triggered
first in reverse order (why?), and then dynamic sensitivities are
triggered in what amounts to reverse order. To delete a sensitivity
which has been handled, it's swapped with the one in the last position,
and then the vector is truncated to drop it at the end. This has the
net effect of stirring the dynamic sensitivities, and isn't easily
immitated using a different approach, even if other approaches would
be more straightforward.

Double check addSensitivity for event.hh

Change-Id: I1e73dce386b95f68e9d6737deb8bed70ef717e0d
Reviewed-on: https://gem5-review.googlesource.com/c/12805
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/systemc/ext/core/sc_port.hh b/src/systemc/ext/core/sc_port.hh
index 88745cc2e..de26f5ae5 100644
--- a/src/systemc/ext/core/sc_port.hh
+++ b/src/systemc/ext/core/sc_port.hh
@@ -41,8 +41,8 @@ namespace sc_gem5
 
 class BindInfo;
 class Module;
-class PendingSensitivityPort;
-class PendingSensitivityFinder;
+class StaticSensitivityPort;
+class StaticSensitivityFinder;
 
 };
 
@@ -87,8 +87,8 @@ class sc_port_base : public sc_object
     virtual void end_of_simulation() = 0;
 
   private:
-    friend class ::sc_gem5::PendingSensitivityPort;
-    friend class ::sc_gem5::PendingSensitivityFinder;
+    friend class ::sc_gem5::StaticSensitivityPort;
+    friend class ::sc_gem5::StaticSensitivityFinder;
     friend class ::sc_gem5::Kernel;
 
     void _gem5Finalize();