1 files changed, 81 insertions, 0 deletions
diff --git a/utils/Worker.h b/utils/Worker.h
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+++ b/utils/Worker.h
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+/*
+ * Copyright (C) 2015-2016 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 ANDROID_WORKER_H_
+#define ANDROID_WORKER_H_
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <condition_variable>
+#include <mutex>
+#include <string>
+#include <thread>
+
+namespace android {
+
+class Worker {
+ public:
+  void Lock() {
+    mutex_.lock();
+  }
+  void Unlock() {
+    mutex_.unlock();
+  }
+
+  void Signal() {
+    cond_.notify_all();
+  }
+  void Exit();
+
+  bool initialized() const {
+    return initialized_;
+  }
+
+ protected:
+  Worker(const char *name, int priority);
+  virtual ~Worker();
+
+  int InitWorker();
+  virtual void Routine() = 0;
+
+  /*
+   * Must be called with the lock acquired. max_nanoseconds may be negative to
+   * indicate infinite timeout, otherwise it indicates the maximum time span to
+   * wait for a signal before returning.
+   * Returns -EINTR if interrupted by exit request, or -ETIMEDOUT if timed out
+   */
+  int WaitForSignalOrExitLocked(int64_t max_nanoseconds = -1);
+
+  bool should_exit() const {
+    return exit_;
+  }
+
+  std::mutex mutex_;
+  std::condition_variable cond_;
+
+ private:
+  void InternalRoutine();
+
+  std::string name_;
+  int priority_;
+
+  std::unique_ptr<std::thread> thread_;
+  bool exit_;
+  bool initialized_;
+};
+}  // namespace android
+#endif