kernel: Divide Event into ReadableEvent and WritableEvent

More hardware accurate. On the actual system, there is a differentiation between the signaler and signalee, they form a client/server relationship much like ServerPort and ClientPort.

src/core/hle/kernel/writable_event.h

@@ -0,0 +1,75 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+#include "core/hle/kernel/object.h"
+#include "core/hle/kernel/wait_object.h"
+
+namespace Kernel {
+
+class KernelCore;
+class ReadableEvent;
+
+class WritableEvent final : public WaitObject {
+public:
+    ~WritableEvent() override;
+
+    /**
+     * Creates an event
+     * @param kernel The kernel instance to create this event under.
+     * @param reset_type ResetType describing how to create event
+     * @param name Optional name of event
+     */
+    static std::tuple<SharedPtr<WritableEvent>, SharedPtr<ReadableEvent>> CreateEventPair(
+        KernelCore& kernel, ResetType reset_type, std::string name = "Unknown");
+
+    /**
+     * Creates an event and registers it in the kernel's named event table
+     * @param kernel The kernel instance to create this event under.
+     * @param reset_type ResetType describing how to create event
+     * @param name name of event
+     */
+    static SharedPtr<WritableEvent> CreateRegisteredEventPair(KernelCore& kernel,
+                                                              ResetType reset_type,
+                                                              std::string name);
+
+    std::string GetTypeName() const override {
+        return "WritableEvent";
+    }
+    std::string GetName() const override {
+        return name;
+    }
+
+    static const HandleType HANDLE_TYPE = HandleType::Event;
+    HandleType GetHandleType() const override {
+        return HANDLE_TYPE;
+    }
+
+    ResetType GetResetType() const {
+        return reset_type;
+    }
+
+    bool ShouldWait(Thread* thread) const override;
+    void Acquire(Thread* thread) override;
+
+    void WakeupAllWaitingThreads() override;
+
+    void Signal();
+    void Clear();
+    void ResetOnAcquire();
+    void ResetOnWakeup();
+    bool IsSignaled() const;
+
+private:
+    explicit WritableEvent(KernelCore& kernel);
+
+    ResetType reset_type; ///< Current ResetType
+
+    bool signaled;    ///< Whether the event has already been signaled
+    std::string name; ///< Name of event (optional)
+};
+
+} // namespace Kernel