Prevent data race in GetStaticInstance

webrtc/system_wrappers/include/static_instance.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 22 matching lines @@
 
 template <class T>
 // Construct On First Use idiom. Avoids
 // "static initialization order fiasco".
 static T* GetStaticInstance(CountOperation count_operation) {
   // TODO (hellner): use atomic wrapper instead.
   static volatile long instance_count = 0;
   static T* volatile instance = NULL;
   CreateOperation state = kInstanceExists;
 #ifndef _WIN32
-  rtc::CriticalSection crit_sect;
+  static rtc::CriticalSection crit_sect;
   rtc::CritScope lock(&crit_sect);
 
   if (count_operation ==
       kAddRefNoCreate && instance_count == 0) {
     return NULL;
   }
   if (count_operation ==
       kAddRef ||
       count_operation == kAddRefNoCreate) {
     instance_count++;
@@ skipping 84 matching lines @@
     }
     return NULL;
   }
 #endif  // #ifndef _WIN32
   return instance;
 }
 
 }  // namspace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_STATIC_INSTANCE_H_