Add HLERequestContext::RunAsync (#7027)

src/core/core_timing.cpp

@@ -47,7 +47,7 @@ TimingEventType* Timing::RegisterEvent(const std::string& name, TimedCallback ca
 }
 
 void Timing::ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_type,
-                           std::uintptr_t user_data, std::size_t core_id) {
+                           std::uintptr_t user_data, std::size_t core_id, bool thread_safe_mode) {
     if (event_queue_locked) {
         return;
     }
@@ -61,6 +61,16 @@ void Timing::ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_
         timer = timers.at(core_id).get();
     }
 
+    if (thread_safe_mode) {
+        // Events scheduled in thread safe mode come after blocking operations with
+        // unpredictable timings in the host machine, so there is no need to be cycle accurate.
+        // To prevent the event from scheduling before the next advance(), we set a minimum time
+        // of MAX_SLICE_LENGTH * 2 cycles into the future.
+        cycles_into_future = std::max(static_cast<s64>(MAX_SLICE_LENGTH * 2), cycles_into_future);
+
+        timer->ts_queue.Push(Event{static_cast<s64>(timer->GetTicks() + cycles_into_future), 0,
+                                   user_data, event_type});
+    } else {
         s64 timeout = timer->GetTicks() + cycles_into_future;
         if (current_timer == timer) {
             // If this event needs to be scheduled before the next advance(), force one early
@@ -75,6 +85,7 @@ void Timing::ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_
                                        user_data, event_type});
         }
     }
+}
 
 void Timing::UnscheduleEvent(const TimingEventType* event_type, std::uintptr_t user_data) {
     if (event_queue_locked) {

src/core/core_timing.h

@@ -254,9 +254,12 @@ public:
      */
     TimingEventType* RegisterEvent(const std::string& name, TimedCallback callback);
 
+    // Make sure to use thread_safe_mode = true if called from a different thread than the
+    // emulator thread, such as coroutines.
     void ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_type,
                        std::uintptr_t user_data = 0,
-                       std::size_t core_id = std::numeric_limits<std::size_t>::max());
+                       std::size_t core_id = std::numeric_limits<std::size_t>::max(),
+                       bool thread_safe_mode = false);
 
     void UnscheduleEvent(const TimingEventType* event_type, std::uintptr_t user_data);
 

src/core/hle/kernel/hle_ipc.h

@@ -7,6 +7,7 @@
 #include <algorithm>
 #include <array>
 #include <chrono>
+#include <future>
 #include <memory>
 #include <string>
 #include <vector>
@@ -247,6 +248,76 @@ public:
                                              std::chrono::nanoseconds timeout,
                                              std::shared_ptr<WakeupCallback> callback);
 
+private:
+    template <typename ResultFunctor>
+    class AsyncWakeUpCallback : public WakeupCallback {
+    public:
+        explicit AsyncWakeUpCallback(ResultFunctor res_functor, std::future<void> fut)
+            : functor(res_functor) {
+            future = std::move(fut);
+        }
+
+        void WakeUp(std::shared_ptr<Kernel::Thread> thread, Kernel::HLERequestContext& ctx,
+                    Kernel::ThreadWakeupReason reason) {
+            functor(ctx);
+        }
+
+    private:
+        ResultFunctor functor;
+        std::future<void> future;
+
+        template <class Archive>
+        void serialize(Archive& ar, const unsigned int) {
+            if (!Archive::is_loading::value && future.valid()) {
+                future.wait();
+            }
+            ar& functor;
+        }
+        friend class boost::serialization::access;
+    };
+
+public:
+    /**
+     * Puts the game thread to sleep and calls the specified async_section asynchronously.
+     * Once the execution of the async section finishes, result_function is called. Use this
+     * mechanism to run blocking IO operations, so that other game threads are allowed to run
+     * while the one performing the blocking operation waits.
+     * @param async_section Callable that takes Kernel::HLERequestContext& as argument
+     * and returns the amount of nanoseconds to wait before calling result_function.
+     * This callable is ran asynchronously.
+     * @param result_function Callable that takes Kernel::HLERequestContext& as argument
+     * and doesn't return anything. This callable is ran from the emulator thread
+     * and can be used to set the IPC result.
+     * @param really_async If set to false, it will call both async_section and result_function
+     * from the emulator thread.
+     */
+    template <typename AsyncFunctor, typename ResultFunctor>
+    void RunAsync(AsyncFunctor async_section, ResultFunctor result_function,
+                  bool really_async = true) {
+
+        if (really_async) {
+            this->SleepClientThread(
+                "RunAsync", std::chrono::nanoseconds(-1),
+                std::make_shared<AsyncWakeUpCallback<ResultFunctor>>(
+                    result_function,
+                    std::move(std::async(std::launch::async, [this, async_section] {
+                        s64 sleep_for = async_section(*this);
+                        this->thread->WakeAfterDelay(sleep_for, true);
+                    }))));
+
+        } else {
+            s64 sleep_for = async_section(*this);
+            if (sleep_for > 0) {
+                auto parallel_wakeup = std::make_shared<AsyncWakeUpCallback<ResultFunctor>>(
+                    result_function, std::move(std::future<void>()));
+                this->SleepClientThread("RunAsync", std::chrono::nanoseconds(sleep_for),
+                                        parallel_wakeup);
+            } else {
+                result_function(*this);
+            }
+        }
+    }
+
     /**
      * Resolves a object id from the request command buffer into a pointer to an object. See the
      * "HLE handle protocol" section in the class documentation for more details.

src/core/hle/kernel/thread.cpp

@@ -244,13 +244,15 @@ void ThreadManager::ThreadWakeupCallback(u64 thread_id, s64 cycles_late) {
     thread->ResumeFromWait();
 }
 
-void Thread::WakeAfterDelay(s64 nanoseconds) {
+void Thread::WakeAfterDelay(s64 nanoseconds, bool thread_safe_mode) {
     // Don't schedule a wakeup if the thread wants to wait forever
     if (nanoseconds == -1)
         return;
+    size_t core = thread_safe_mode ? core_id : std::numeric_limits<std::size_t>::max();
 
     thread_manager.kernel.timing.ScheduleEvent(nsToCycles(nanoseconds),
-                                               thread_manager.ThreadWakeupEventType, thread_id);
+                                               thread_manager.ThreadWakeupEventType, thread_id,
+                                               core, thread_safe_mode);
 }
 
 void Thread::ResumeFromWait() {

src/core/hle/kernel/thread.h

@@ -238,8 +238,10 @@ public:
     /**
      * Schedules an event to wake up the specified thread after the specified delay
      * @param nanoseconds The time this thread will be allowed to sleep for
+     * @param thread_safe_mode Set to true if called from a different thread than the emulator
+     * thread, such as coroutines.
      */
-    void WakeAfterDelay(s64 nanoseconds);
+    void WakeAfterDelay(s64 nanoseconds, bool thread_safe_mode = false);
 
     /**
      * Sets the result after the thread awakens (from either WaitSynchronization SVC)