Support stopping emulation while all threads are sleeping

This fixes #242

src/windows-emulator/windows_emulator.cpp

@@ -606,11 +606,13 @@ void windows_emulator::setup_hooks()
 
 void windows_emulator::start(size_t count)
 {
+    this->should_stop = false;
+
     const auto use_count = count > 0;
     const auto start_instructions = this->executed_instructions_;
     const auto target_instructions = start_instructions + count;
 
-    while (true)
+    while (!this->should_stop)
     {
         if (this->switch_thread_ || !this->current_thread().is_thread_ready(this->process, this->clock()))
         {
@@ -638,6 +640,12 @@ void windows_emulator::start(size_t count)
     }
 }
 
+void windows_emulator::stop()
+{
+    this->should_stop = true;
+    this->emu().stop();
+}
+
 void windows_emulator::register_factories(utils::buffer_deserializer& buffer)
 {
     buffer.register_factory<memory_manager_wrapper>([this] {

src/windows-emulator/windows_emulator.hpp

@@ -132,6 +132,7 @@ class windows_emulator
     }
 
     void start(size_t count = 0);
+    void stop();
 
     void serialize(utils::buffer_serializer& buffer) const;
     void deserialize(utils::buffer_deserializer& buffer);
@@ -191,6 +192,7 @@ class windows_emulator
     bool switch_thread_{false};
     bool use_relative_time_{false};
     bool silent_until_main_{false};
+    std::atomic_bool should_stop{false};
 
     std::unordered_map<uint16_t, uint16_t> port_mappings_{};
 

src/windows-gdb-stub/win_x64_gdb_stub_handler.hpp

@@ -14,6 +14,11 @@ class win_x64_gdb_stub_handler : public x64_gdb_stub_handler
     {
     }
 
+    void on_interrupt() override
+    {
+        this->win_emu_->stop();
+    }
+
     bool should_stop() override
     {
         return this->should_stop_();