upload android base code part6

android/system/extras/memory_replay/Threads.h

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+/*
+ * Copyright (C) 2015 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 _MEMORY_REPLAY_THREADS_H
+#define _MEMORY_REPLAY_THREADS_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+class Pointers;
+class Thread;
+
+class Threads {
+ public:
+  Threads(Pointers* pointers, size_t max_threads);
+  virtual ~Threads();
+
+  Thread* CreateThread(pid_t tid);
+  Thread* FindThread(pid_t tid);
+  void WaitForAllToQuiesce();
+  void Finish(Thread* thread);
+  void FinishAll();
+
+  size_t num_threads() { return num_threads_; }
+  size_t max_threads() { return max_threads_; }
+  uint64_t total_time_nsecs() { return total_time_nsecs_; }
+
+ private:
+  Pointers* pointers_ = nullptr;
+  Thread* threads_ = nullptr;
+  size_t data_size_ = 0;
+  size_t max_threads_ = 0;
+  size_t num_threads_= 0;
+  uint64_t total_time_nsecs_ = 0;
+
+  Thread* FindEmptyEntry(pid_t tid);
+  size_t GetHashEntry(pid_t tid);
+
+  void ClearData();
+
+  friend Thread;
+};
+
+#endif // _MEMORY_REPLAY_THREADS_H