#include "src/mc/explo/udpor/EventSet.hpp"
#include "src/mc/explo/udpor/Configuration.hpp"
#include "src/mc/explo/udpor/History.hpp"
+#include "src/mc/explo/udpor/UnfoldingEvent.hpp"
#include <iterator>
+#include <stack>
namespace simgrid::mc::udpor {
return *this == history.get_all_maximal_events();
}
+bool EventSet::is_conflict_free() const
+{
+ return false;
+}
+
+std::vector<const UnfoldingEvent*> EventSet::get_topological_ordering() const
+{
+ // This is essentially an implementation of detecting cycles
+ // in a graph with coloring, except it makes a topological
+ // ordering out of it
+ if (empty()) {
+ return std::vector<const UnfoldingEvent*>();
+ }
+
+ std::stack<const UnfoldingEvent*> event_stack;
+ std::vector<const UnfoldingEvent*> topological_ordering;
+ EventSet unknown_events = *this;
+ EventSet temporarily_marked_events;
+ EventSet permanently_marked_events;
+
+ while (not unknown_events.empty()) {
+ EventSet discovered_events;
+ event_stack.push(*unknown_events.begin());
+
+ while (not event_stack.empty()) {
+ const UnfoldingEvent* evt = event_stack.top();
+ discovered_events.insert(evt);
+
+ if (not temporarily_marked_events.contains(evt)) {
+ // If this event hasn't yet been marked, do
+ // so now so that if we both see it
+ // again in a child we can detect a cycle
+ temporarily_marked_events.insert(evt);
+
+ EventSet immediate_causes = evt->get_immediate_causes();
+ if (!immediate_causes.empty() && immediate_causes.is_subset_of(temporarily_marked_events)) {
+ throw std::invalid_argument("Attempted to perform a topological sort on a configuration "
+ "whose contents contain a cycle. The configuration (and the graph "
+ "connecting all of the events) is an invalid event structure");
+ }
+ immediate_causes.subtract(discovered_events);
+ immediate_causes.subtract(permanently_marked_events);
+ std::for_each(immediate_causes.begin(), immediate_causes.end(),
+ [&event_stack](const UnfoldingEvent* cause) { event_stack.push(cause); });
+ } else {
+ unknown_events.remove(evt);
+ temporarily_marked_events.remove(evt);
+ permanently_marked_events.insert(evt);
+
+ // In moving this event to the end of the list,
+ // we are saying this events "happens before" other
+ // events that are added later.
+ if (this->contains(evt)) {
+ topological_ordering.push_back(evt);
+ }
+
+ // Only now do we remove the event, i.e. once
+ // we've processed the same event twice
+ event_stack.pop();
+ }
+ }
+ }
+ return topological_ordering;
+}
+
+std::vector<const UnfoldingEvent*> EventSet::get_topological_ordering_of_reverse_graph() const
+{
+ // The implementation exploits the property that
+ // a topological sorting S^R of the reverse graph G^R
+ // of some graph G is simply the reverse of any
+ // topological sorting S of G.
+ auto topological_events = get_topological_ordering();
+ std::reverse(topological_events.begin(), topological_events.end());
+ return topological_events;
+}
+
} // namespace simgrid::mc::udpor
\ No newline at end of file
