[NaCl SDK] Upate atomic ops in nacl_io

native_client_sdk/src/libraries/sdk_util/thread_pool.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Simple thread pool class
 
 #ifndef LIBRARIES_SDK_UTIL_THREAD_POOL_H_
 #define LIBRARIES_SDK_UTIL_THREAD_POOL_H_
 
 #include <pthread.h>
 #include <semaphore.h>
 
+#include "sdk_util/atomicops.h"
+
 // typdef helper for work function
 typedef void (*WorkFunction)(int task_index, void* data);
 
 // ThreadPool is a class to manage num_threads and assign
 // them num_tasks of work at a time. Each call
 // to Dispatch(..) will block until all tasks complete.
 // If 0 is passed in for num_threads, all tasks will be
 // issued on the dispatch thread.
 
 class ThreadPool {
  public:
   void Dispatch(int num_tasks, WorkFunction work, void* data);
   explicit ThreadPool(int num_threads);
   ~ThreadPool();
  private:
   int DecCounter();
   void Setup(int counter, WorkFunction work, void* data);
   void DispatchMany(int num_tasks, WorkFunction work, void* data);
   void DispatchHere(int num_tasks, WorkFunction work, void* data);
   void WorkLoop();
   static void* WorkerThreadEntry(void* data);
   void PostExitAndJoinAll();
   pthread_t* threads_;
-  int counter_;
+  Atomic32 counter_;
   const int num_threads_;
   bool exiting_;
   void* user_data_;
   WorkFunction user_work_function_;
   sem_t work_sem_;
   sem_t done_sem_;
 };
 #endif  // LIBRARIES_SDK_UTIL_THREAD_POOL_H_