upload android base code part6

android/system/connectivity/wificond/event_loop.h

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+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WIFICOND_EVENT_LOOP_H_
+#define WIFICOND_EVENT_LOOP_H_
+
+#include <functional>
+
+namespace android {
+namespace wificond {
+
+// Abstract class for dispatching tasks.
+class EventLoop {
+ public:
+  enum ReadyMode {
+      kModeInput,
+      kModeOutput
+  };
+
+  virtual ~EventLoop() {}
+
+  // Enqueues a callback.
+  // This function can be called on any thread.
+  virtual void PostTask(const std::function<void()>& callback) = 0;
+
+  // Enqueues a callback to be processed after a specified period of time.
+  // |delay_ms| is delay time in milliseconds. It should not be negative.
+  // This function can be called on any thread.
+  virtual void PostDelayedTask(const std::function<void()>& callback,
+                               int64_t delay_ms) = 0;
+
+  // Monitoring file descriptor for data.
+  // Callback will be executed when specific file descriptor is ready.
+  // File descriptor is provided as a parameter to this callback:
+  // This function can be called on any thread.
+  // This returns true upon success and returns false when it failed.
+  virtual bool WatchFileDescriptor(
+      int fd,
+      ReadyMode mode,
+      const std::function<void(int)>& callback_) = 0;
+
+  // Stop monitoring file descriptor |fd|.
+  // This function can be called on any thread.
+  // This returns true upon success and returns false when it failed to
+  // remove the file descriptor, or this file descriptor was not registered
+  // for watching.
+  virtual bool StopWatchFileDescriptor(int fd);
+};
+
+}  // namespace wificond
+}  // namespace android
+
+#endif  // WIFICOND_EVENT_LOOP_H_