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wpinet/src/main/native/include/wpi/net/EventLoopRunner.hpp

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+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#ifndef WPINET_EVENTLOOPRUNNER_H_
+#define WPINET_EVENTLOOPRUNNER_H_
+
+#include <functional>
+#include <memory>
+
+#include <wpi/SafeThread.h>
+
+#include "wpinet/uv/Loop.h"
+
+namespace wpi {
+
+/**
+ * Executes an event loop on a separate thread.
+ */
+class EventLoopRunner {
+ public:
+  using LoopFunc = std::function<void(uv::Loop&)>;
+
+  EventLoopRunner();
+  virtual ~EventLoopRunner();
+
+  /**
+   * Stop the loop.  Once the loop is stopped it cannot be restarted.
+   * This function does not return until the loop has exited.
+   */
+  void Stop();
+
+  /**
+   * Run a function asynchronously (once) on the loop.
+   * This is safe to call from any thread, but is NOT safe to call from the
+   * provided function (it will deadlock).
+   * @param func function to execute on the loop
+   */
+  void ExecAsync(LoopFunc func);
+
+  /**
+   * Run a function synchronously (once) on the loop.
+   * This is safe to call from any thread, but is NOT safe to call from the
+   * provided function (it will deadlock).
+   * This does not return until the function finishes executing.
+   * @param func function to execute on the loop
+   */
+  void ExecSync(LoopFunc func);
+
+  /**
+   * Get the loop.  If the loop thread is not running, returns nullptr.
+   * @return The loop
+   */
+  std::shared_ptr<uv::Loop> GetLoop();
+
+ private:
+  class Thread;
+  SafeThreadOwner<Thread> m_owner;
+};
+
+}  // namespace wpi
+
+#endif  // WPINET_EVENTLOOPRUNNER_H_