2 files changed, 22 insertions, 1 deletions

diff --git a/src/core/hle/kernel/readable_event.cpp b/src/core/hle/kernel/readable_event.cpp
index 92e16b4e6..ba01f495c 100644
--- a/src/core/hle/kernel/readable_event.cpp
+++ b/src/core/hle/kernel/readable_event.cpp
@@ -4,10 +4,10 @@
 
 #include <algorithm>
 #include "common/assert.h"
+#include "core/hle/kernel/errors.h"
 #include "core/hle/kernel/object.h"
 #include "core/hle/kernel/readable_event.h"
 #include "core/hle/kernel/thread.h"
-#include "core/hle/kernel/writable_event.h"
 
 namespace Kernel {
 
@@ -34,6 +34,16 @@ void ReadableEvent::Clear() {
     signaled = false;
 }
 
+ResultCode ReadableEvent::Reset() {
+    if (!signaled) {
+        return ERR_INVALID_STATE;
+    }
+
+    Clear();
+
+    return RESULT_SUCCESS;
+}
+
 void ReadableEvent::WakeupAllWaitingThreads() {
     WaitObject::WakeupAllWaitingThreads();
 
diff --git a/src/core/hle/kernel/readable_event.h b/src/core/hle/kernel/readable_event.h
index 867ff3051..80b3b0aba 100644
--- a/src/core/hle/kernel/readable_event.h
+++ b/src/core/hle/kernel/readable_event.h
@@ -7,6 +7,8 @@
 #include "core/hle/kernel/object.h"
 #include "core/hle/kernel/wait_object.h"
 
+union ResultCode;
+
 namespace Kernel {
 
 class KernelCore;
@@ -39,8 +41,17 @@ public:
 
     void WakeupAllWaitingThreads() override;
 
+    /// Unconditionally clears the readable event's state.
     void Clear();
 
+    /// Clears the readable event's state if and only if it
+    /// has already been signaled.
+    ///
+    /// @pre The event must be in a signaled state. If this event
+    ///      is in an unsignaled state and this function is called,
+    ///      then ERR_INVALID_STATE will be returned.
+    ResultCode Reset();
+
 private:
     explicit ReadableEvent(KernelCore& kernel);