Core timing: use only one thread.

src/core/core_timing.cpp

@@ -61,12 +61,7 @@ void CoreTiming::Initialize(std::function<void()>&& on_thread_init_) {
     const auto empty_timed_callback = [](std::uintptr_t, std::chrono::nanoseconds) {};
     ev_lost = CreateEvent("_lost_event", empty_timed_callback);
     if (is_multicore) {
-        const auto hardware_concurrency = std::thread::hardware_concurrency();
-        size_t id = 0;
-        worker_threads.emplace_back(ThreadEntry, std::ref(*this), id++);
-        if (hardware_concurrency > 8) {
-            worker_threads.emplace_back(ThreadEntry, std::ref(*this), id++);
-        }
+        worker_threads.emplace_back(ThreadEntry, std::ref(*this), 0);
     }
 }
 
@@ -228,14 +223,11 @@ std::optional<s64> CoreTiming::Advance() {
         event_queue.pop_back();
 
         if (const auto event_type{evt.type.lock()}) {
-            sequence_mutex.lock();
+
             event_mutex.unlock();
 
-            event_type->guard.lock();
-            sequence_mutex.unlock();
             const s64 delay = static_cast<s64>(GetGlobalTimeNs().count() - evt.time);
             event_type->callback(evt.user_data, std::chrono::nanoseconds{delay});
-            event_type->guard.unlock();
 
             event_mutex.lock();
             pending_events.fetch_sub(1, std::memory_order_relaxed);

src/core/core_timing.h

@@ -32,7 +32,6 @@ struct EventType {
     TimedCallback callback;
     /// A pointer to the name of the event.
     const std::string name;
-    mutable std::mutex guard;
 };
 
 /**
@@ -157,7 +156,6 @@ private:
     std::condition_variable wait_pause_cv;
     std::condition_variable wait_signal_cv;
     mutable std::mutex event_mutex;
-    mutable std::mutex sequence_mutex;
 
     std::atomic<bool> paused_state{};
     bool is_paused{};