From: Brian Norris <banorris@uci.edu>
Date: Thu, 21 Jun 2012 08:56:50 +0000 (-0700)
Subject: action: add happens_before() function
X-Git-Tag: pldi2013~391^2~5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cb9b254332794ea63d0089b21b498f4a5301f08b;hp=e8bc4a0715ce1c86f3ff7d24179e1164bf3ee61b;p=model-checker.git

action: add happens_before() function

Now I can easily compare two ModelActions with the happens_before()
relationship. Of course, the clock vectors are not fully complete yet, but
this sets the stage...
---

diff --git a/action.cc b/action.cc
index 34650c6..9f95727 100644
--- a/action.cc
+++ b/action.cc
@@ -133,6 +133,17 @@ void ModelAction::read_from(ModelAction *act)
 	value = act->value;
 }
 
+/**
+ * Check whether 'this' happens before act, according to the memory-model's
+ * happens before relation. This is checked via the ClockVector constructs.
+ * @return true if this action's thread has synchronized with act's thread
+ * since the execution of act, false otherwise.
+ */
+bool ModelAction::happens_before(ModelAction *act)
+{
+	return act->cv->synchronized_since(this);
+}
+
 void ModelAction::print(void)
 {
 	const char *type_str;
diff --git a/action.h b/action.h
index f554e36..ae4afb2 100644
--- a/action.h
+++ b/action.h
@@ -58,6 +58,8 @@ public:
 	ClockVector * get_cv() const { return cv; }
 	void read_from(ModelAction *act);
 
+	bool happens_before(ModelAction *act);
+
 	inline bool operator <(const ModelAction& act) const {
 		return get_seq_number() < act.get_seq_number();
 	}