Added class Schedule for threads

luprex/core/cpp/sched.cpp

@@ -0,0 +1,27 @@
+
+#include "sched.hpp"
+
+bool SchedEntry::operator < (const SchedEntry &other) const {
+    if (clock_ < other.clock_) return true;
+    if (clock_ > other.clock_) return false;
+    if (thread_id_ < other.thread_id_) return true;
+    if (thread_id_ > other.thread_id_) return false;
+    if (place_id_ < other.place_id_) return true;
+    if (place_id_ > other.place_id_) return false;
+    return false;
+}
+
+void Schedule::add(int64_t clk, int64_t thid, int64_t plid) {
+    schedule_.insert(SchedEntry(clk, thid, plid));
+}
+
+bool Schedule::ready(int64_t clk) const {
+    return (!schedule_.empty()) && (schedule_.begin()->clock() <= clk);
+}
+
+SchedEntry Schedule::pop() {
+    SchedEntry result = *schedule_.begin();
+    schedule_.erase(schedule_.begin());
+    return result;
+}
+