1 files changed, 65 insertions, 0 deletions

diff --git a/src/core/hle/kernel/condition_variable.h b/src/core/hle/kernel/condition_variable.h
new file mode 100644
index 000000000..27b8547c0
--- /dev/null
+++ b/src/core/hle/kernel/condition_variable.h
@@ -0,0 +1,65 @@
+// Copyright 2018 Yuzu Emulator Team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <queue>
+#include <string>
+#include "common/common_types.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/wait_object.h"
+#include "core/hle/result.h"
+
+namespace Kernel {
+
+class ConditionVariable final : public WaitObject {
+public:
+    /**
+     * Creates a condition variable.
+     * @param guest_addr Address of the object tracking the condition variable in guest memory. If
+     * specified, this condition variable will update the guest object when its state changes.
+     * @param mutex_addr Optional address of a guest mutex associated with this condition variable,
+     * used by the OS for implementing events.
+     * @param name Optional name of condition variable.
+     * @return The created condition variable.
+     */
+    static ResultVal<SharedPtr<ConditionVariable>> Create(VAddr guest_addr, VAddr mutex_addr = 0,
+                                                          std::string name = "Unknown");
+
+    std::string GetTypeName() const override {
+        return "ConditionVariable";
+    }
+    std::string GetName() const override {
+        return name;
+    }
+
+    static const HandleType HANDLE_TYPE = HandleType::ConditionVariable;
+    HandleType GetHandleType() const override {
+        return HANDLE_TYPE;
+    }
+
+    s32 GetAvailableCount() const;
+    void SetAvailableCount(s32 value) const;
+
+    std::string name; ///< Name of condition variable (optional)
+    VAddr guest_addr; ///< Address of the guest condition variable value
+    VAddr mutex_addr; ///< (optional) Address of guest mutex value associated with this condition
+                      ///< variable, used for implementing events
+
+    bool ShouldWait(Thread* thread) const override;
+    void Acquire(Thread* thread) override;
+
+    /**
+     * Releases a slot from a condition variable.
+     * @param target The number of threads to wakeup, -1 is all.
+     * @return ResultCode indicating if the operation succeeded.
+     */
+    ResultCode Release(s32 target);
+
+private:
+    ConditionVariable();
+    ~ConditionVariable() override;
+};
+
+} // namespace Kernel