+#define __STDC_FORMAT_MACROS
+#include <inttypes.h>
+
#include "promise.h"
#include "model.h"
#include "schedule.h"
+#include "action.h"
+#include "threads-model.h"
+
+/**
+ * @brief Promise constructor
+ * @param read The read which reads from a promised future value
+ * @param fv The future value that is promised
+ */
+Promise::Promise(ModelAction *read, struct future_value fv) :
+ num_available_threads(0),
+ fv(fv),
+ read(read),
+ write(NULL)
+{
+ add_thread(fv.tid);
+ eliminate_thread(read->get_tid());
+}
/**
* Eliminate a thread which no longer can satisfy this promise. Once all
bool Promise::eliminate_thread(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])
+ if (!thread_is_available(tid))
return false;
- synced_thread[id] = true;
- 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]) && ((int)i != promise_tid) && model->is_enabled(int_to_id(i))) {
- return false;
- }
- }
- return true;
+ available_thread[id] = false;
+ num_available_threads--;
+ return has_failed();
}
-bool Promise::check_promise() const
+/**
+ * Add a thread which may resolve this promise
+ *
+ * @param tid The thread ID
+ */
+void Promise::add_thread(thread_id_t tid)
{
- 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]) && model->is_enabled(int_to_id(i))) {
- return false;
- }
+ 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: ", fv.value, id_to_int(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;
+}
+
+/**
+ * @brief Check if an action's thread and location are compatible for resolving
+ * this promise
+ * @param act The action to check against
+ * @return True if we are compatible; false otherwise
+ */
+bool Promise::is_compatible(const ModelAction *act) const
+{
+ return thread_is_available(act->get_tid()) && read->same_var(act);
+}
+
+/**
+ * @brief Check if an action's thread and location are compatible for resolving
+ * this promise, and that the promise is thread-exclusive
+ * @param act The action to check against
+ * @return True if we are compatible and exclusive; false otherwise
+ */
+bool Promise::is_compatible_exclusive(const ModelAction *act) const
+{
+ return get_num_available_threads() == 1 && is_compatible(act);
}