From bc266a9d98f38f6fd1006f1ca52bd57e6a7f37d3 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Tue, 4 Feb 2020 15:06:23 -0400
Subject: Common: Implement a basic Fiber class.

---
 src/common/fiber.h | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 src/common/fiber.h

(limited to 'src/common/fiber.h')

diff --git a/src/common/fiber.h b/src/common/fiber.h
new file mode 100644
index 000000000..ab44905cf
--- /dev/null
+++ b/src/common/fiber.h
@@ -0,0 +1,55 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <memory>
+
+#include "common/common_types.h"
+#include "common/spin_lock.h"
+
+namespace Common {
+
+class Fiber {
+public:
+    Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter);
+    ~Fiber();
+
+    Fiber(const Fiber&) = delete;
+    Fiber& operator=(const Fiber&) = delete;
+
+    Fiber(Fiber&&) = default;
+    Fiber& operator=(Fiber&&) = default;
+
+    /// Yields control from Fiber 'from' to Fiber 'to'
+    /// Fiber 'from' must be the currently running fiber.
+    static void YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to);
+    static std::shared_ptr<Fiber> ThreadToFiber();
+
+    /// Only call from main thread's fiber
+    void Exit();
+
+    /// Used internally but required to be public, Shall not be used
+    void _start(void* parameter);
+
+    /// Changes the start parameter of the fiber. Has no effect if the fiber already started
+    void SetStartParameter(void* new_parameter) {
+        start_parameter = new_parameter;
+    }
+
+private:
+    Fiber();
+
+    struct FiberImpl;
+
+    SpinLock guard;
+    std::function<void(void*)> entry_point;
+    void* start_parameter;
+    std::shared_ptr<Fiber> previous_fiber;
+    std::unique_ptr<FiberImpl> impl;
+    bool is_thread_fiber{};
+};
+
+} // namespace Common
-- 
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