First round of dead file removal

experimental/hex/thread_safe_ref_count.h

-// Copyright (c) 2011 The Native Client Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef THREAD_SAFE_REF_COUNT_H
-#define THREAD_SAFE_REF_COUNT_H
-
-#include <pthread.h>
-#include <cassert>
-
-const int kPthreadMutexSuccess = 0;
-
-namespace  {
-// Some synchronization helper classes.
-
-class ScopedLock {
- public:
-  explicit ScopedLock(pthread_mutex_t* mutex)
-      : mutex_(mutex) {
-    if (pthread_mutex_lock(mutex_) != kPthreadMutexSuccess) {
-      mutex_ = NULL;
-    }
-  }
-  ~ScopedLock() {
-    if (mutex_ != NULL) {
-      pthread_mutex_unlock(mutex_);
-    }
-  }
- private:
-  ScopedLock& operator=(const ScopedLock&);  // Not implemented, do not use.
-  ScopedLock(const ScopedLock&);  // Not implemented, do not use.
-  pthread_mutex_t* mutex_;  // Weak reference, passed in to constructor.
-};
-
-class ThreadSafeRefCount {
- public:
-  ThreadSafeRefCount()
-      : ref_(0) {
-    Init();
-  }
-
-  void Init() {
-    pthread_mutex_init(&mutex_, NULL);
-  }
-
-  int32_t AddRef() {
-    ScopedLock s(&mutex_);
-    return ++ref_;
-  }
-
-  int32_t Release() {
-    ScopedLock s(&mutex_);
-    return --ref_;
-  }
-
- private:
-  int32_t ref_;
-  pthread_mutex_t mutex_;
-};
-
-}  // namespace
-#endif  // THREAD_SAFE_REF_COUNT_H
-