promise: rename has_sync_thread() -> thread_is_eliminated()

[model-checker.git] / promise.cc

diff --git a/promise.cc b/promise.cc
index 259ba058ddba82bbd8eaeb0b8559a24144cd087e..3b2aa960f967bb389d48b24fe61e0d4f62664471 100644 (file)
--- a/promise.cc
+++ b/promise.cc
@@ -2,20 +2,40 @@
 #include "model.h"
 #include "schedule.h"
 
-bool Promise::increment_threads(thread_id_t tid) { 
-       unsigned int id=id_to_int(tid); 
-       if (id>=synced_thread.size()) {
-               synced_thread.resize(id+1, false);
-       }
-       if (synced_thread[id])
+/**
+ * Eliminate a thread which no longer can satisfy this promise. Once all
+ * enabled threads have been eliminated, this promise is unresolvable.
+ *
+ * @param tid The thread ID of the thread to eliminate
+ * @return True, if this elimination has invalidated the promise; false
+ * otherwise
+ */
+bool Promise::eliminate_thread(thread_id_t tid)
+{
+       unsigned int id = id_to_int(tid);
+       if (id >= eliminated_thread.size())
+               eliminated_thread.resize(id + 1, false);
+       if (eliminated_thread[id])
                return false;
-       
-       synced_thread[id]=true;
-       bool * enabled=model->get_scheduler()->get_enabled();
 
-       for(unsigned int i=0;i<model->get_num_threads();i++) {
-               if (!synced_thread[id] && enabled[id])
+       eliminated_thread[id] = true;
+       return has_failed();
+}
+
+/**
+ * Check if this promise has failed. A promise can fail when all threads which
+ * could possibly satisfy the promise have been eliminated.
+ *
+ * @return True, if this promise has failed; false otherwise
+ */
+bool Promise::has_failed() const
+{
+       unsigned int size = eliminated_thread.size();
+       int promise_tid = id_to_int(read->get_tid());
+       for (unsigned int i = 1; i < model->get_num_threads(); i++) {
+               if ((i >= size || !eliminated_thread[i]) && ((int)i != promise_tid) && model->is_enabled(int_to_id(i))) {
                        return false;
+               }
        }
        return true;
 }