X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=promise.cc;h=ea5e7e635cf47df48a2ffc15fa0cd35d73b76025;hb=5236e7a4403ccc6d28b3fdc746c5710d6190310a;hp=59fb9ee43115cd81ed60b2487ffbb563e90bd6da;hpb=202542965363285e68bb33654a62fe816c69b176;p=model-checker.git

diff --git a/promise.cc b/promise.cc
index 59fb9ee..ea5e7e6 100644
--- a/promise.cc
+++ b/promise.cc
@@ -1,34 +1,98 @@
+#define __STDC_FORMAT_MACROS
+#include <inttypes.h>
+
 #include "promise.h"
 #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 (!thread_is_available(tid))
 		return false;
-	
-	synced_thread[id]=true;
-	enabled_type_t * enabled=model->get_scheduler()->get_enabled();
-	unsigned int sync_size=synced_thread.size();
-	int promise_tid=id_to_int(read->get_tid());
-	for(unsigned int i=1;i<model->get_num_threads();i++) {
-		if ((i >= sync_size || !synced_thread[i]) && ( i != promise_tid ) && (enabled[i] != THREAD_DISABLED)) {
-			return false;
-		}
-	}
-	return true;
+
+	available_thread[id] = false;
+	num_available_threads--;
+	return has_failed();
 }
 
-bool Promise::check_promise() {
-	enabled_type_t * enabled=model->get_scheduler()->get_enabled();
-	unsigned int sync_size=synced_thread.size();
-	for(unsigned int i=1;i<model->get_num_threads();i++) {
-		if ((i >= sync_size || !synced_thread[i]) && (enabled[i] != THREAD_DISABLED)) {
-			return false;
-		}
+/**
+ * Add a thread which may resolve this promise
+ *
+ * @param tid The thread ID
+ */
+void Promise::add_thread(thread_id_t tid)
+{
+	unsigned int id = id_to_int(tid);
+	if (id >= available_thread.size())
+		available_thread.resize(id + 1, false);
+	if (!available_thread[id]) {
+		available_thread[id] = true;
+		num_available_threads++;
 	}
-	return true;
+}
+
+/**
+ * Check if a thread is available for resolving this promise. That is, the
+ * thread must have been previously marked for resolving this promise, and it
+ * cannot have been eliminated due to synchronization, etc.
+ *
+ * @param tid Thread ID of the thread to check
+ * @return True if the thread is available; false otherwise
+ */
+bool Promise::thread_is_available(thread_id_t tid) const
+{
+	unsigned int id = id_to_int(tid);
+	if (id >= available_thread.size())
+		return false;
+	return available_thread[id];
+}
+
+/** @brief Print debug info about the Promise */
+void Promise::print() const
+{
+	model_print("Promised value %#" PRIx64 ", read from thread %d, available threads to resolve: ", value, read->get_tid());
+	for (unsigned int i = 0; i < available_thread.size(); i++)
+		if (available_thread[i])
+			model_print("[%d]", i);
+	model_print("\n");
+}
+
+/**
+ * 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
+{
+	return num_available_threads == 0;
+}
+
+/**
+ * @param write A store which could satisfy this Promise
+ * @return True if the store can satisfy this Promise; false otherwise
+ */
+bool Promise::is_compatible(const ModelAction *write) const
+{
+	return thread_is_available(write->get_tid()) && read->same_var(write);
+}
+
+/**
+ * @brief Check if a promise is compatible with a store and is exclusive to its
+ * thread
+ * @param write The store to check against
+ * @return True if we are compatible and exclusive; false otherwise
+ */
+bool Promise::is_compatible_exclusive(const ModelAction *write) const
+{
+	return get_num_available_threads() == 1 && is_compatible(write);
 }