diff --git a/include/cpu.h b/include/cpu.h
new file mode 100644
index 0000000..215003f
--- /dev/null
+++ b/include/cpu.h
@@ -0,0 +1,51 @@
+#include "module.h"
+#include <memory>
+#include <random>
+#include <vector>
+
+namespace dark {
+
+class CPU {
+private:
+	std::vector<std::unique_ptr<ModuleBase>> modules;
+
+public:
+	unsigned long long cycles = 0;
+
+private:
+	void sync_all() {
+		for (auto &module: modules)
+			module->sync();
+	}
+
+public:
+	void add_module(std::unique_ptr<ModuleBase> module) {
+		modules.push_back(std::move(module));
+	}
+	void run_once() {
+		++cycles;
+		for (auto &module: modules)
+			module->work();
+		sync_all();
+	}
+	void run_once_shuffle() {
+		static std::default_random_engine engine;
+		std::vector<ModuleBase *> shuffled;
+		shuffled.reserve(modules.size());
+		for (auto &module: modules)
+			shuffled.push_back(module.get());
+		std::shuffle(shuffled.begin(), shuffled.end(), engine);
+
+		++cycles;
+		for (auto &module: shuffled)
+			module->work();
+		sync_all();
+	}
+	void run(unsigned long long max_cycles = 0, bool shuffle = false) {
+		auto func = shuffle ? &CPU::run_once_shuffle : &CPU::run_once;
+		while (max_cycles == 0 || cycles < max_cycles)
+			(this->*func)();
+	}
+};
+
+}// namespace dark
diff --git a/include/module.h b/include/module.h
new file mode 100644
index 0000000..674fafb
--- /dev/null
+++ b/include/module.h
@@ -0,0 +1,19 @@
+#include "synchronize.h"
+namespace dark {
+
+struct ModuleBase {
+	virtual void work() = 0;
+	virtual void sync() = 0;
+	virtual ~ModuleBase() = default;
+};
+
+template<typename _Tinput, typename _Toutput, typename _Tprivate>
+struct Module : public ModuleBase, public _Tinput, public _Toutput, protected _Tprivate {
+	void sync() override final {
+		sync_member(static_cast<_Tinput &>(*this));
+		sync_member(static_cast<_Toutput &>(*this));
+		sync_member(static_cast<_Tprivate &>(*this));
+	}
+};
+
+}// namespace dark