Merge pull request #3101 from Subv/hle_thread_pause2

Kernel/Threads: Add a new thread status that will allow using a Kernel::Event to put a guest thread to sleep inside an HLE handler until said event is signaled

src/core/hle/kernel/hle_ipc.h

@@ -6,7 +6,9 @@
 
 #include <algorithm>
 #include <array>
+#include <chrono>
 #include <memory>
+#include <string>
 #include <vector>
 #include <boost/container/small_vector.hpp>
 #include "common/common_types.h"
@@ -23,6 +25,8 @@ namespace Kernel {
 
 class HandleTable;
 class Process;
+class Thread;
+class Event;
 
 /**
  * Interface implemented by HLE Session handlers.
@@ -166,6 +170,24 @@ public:
         return session;
     }
 
+    using WakeupCallback = std::function<void(SharedPtr<Thread> thread, HLERequestContext& context,
+                                              ThreadWakeupReason reason)>;
+
+    /**
+     * Puts the specified guest thread to sleep until the returned event is signaled or until the
+     * specified timeout expires.
+     * @param thread Thread to be put to sleep.
+     * @param reason Reason for pausing the thread, to be used for debugging purposes.
+     * @param timeout Timeout in nanoseconds after which the thread will be awoken and the callback
+     * invoked with a Timeout reason.
+     * @param callback Callback to be invoked when the thread is resumed. This callback must write
+     * the entire command response once again, regardless of the state of it before this function
+     * was called.
+     * @returns Event that when signaled will resume the thread and call the callback function.
+     */
+    SharedPtr<Event> SleepClientThread(SharedPtr<Thread> thread, const std::string& reason,
+                                       std::chrono::nanoseconds timeout, WakeupCallback&& callback);
+
     /**
      * 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.