- Need MutexLockers in os_linux.cc.

runtime/vm/os_linux.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "vm/os.h"
 
 #include <errno.h>  // NOLINT
 #include <limits.h>  // NOLINT
 #include <malloc.h>  // NOLINT
 #include <time.h>  // NOLINT
 #include <sys/resource.h>  // NOLINT
 #include <sys/time.h>  // NOLINT
 #include <sys/types.h>  // NOLINT
 #include <sys/syscall.h>  // NOLINT
 #include <sys/stat.h>  // NOLINT
 #include <fcntl.h>  // NOLINT
 #include <unistd.h>  // NOLINT
 
 #include "platform/utils.h"
 #include "vm/code_observers.h"
 #include "vm/dart.h"
 #include "vm/debuginfo.h"
 #include "vm/isolate.h"
+#include "vm/lockers.h"
 #include "vm/thread.h"
 #include "vm/vtune.h"
 #include "vm/zone.h"
 
 
 namespace dart {
 
 // Linux CodeObservers.
 
 DEFINE_FLAG(bool, generate_gdb_symbols, false,
@@ skipping 577 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)