sandbox/linux/services/thread_helpers.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef SANDBOX_LINUX_SERVICES_THREAD_HELPERS_H_
   6 #define SANDBOX_LINUX_SERVICES_THREAD_HELPERS_H_
   7
   8 #include "base/basictypes.h"
   9 #include "sandbox/sandbox_export.h"
  10
  11 namespace base { class Thread; }
  12
  13 namespace sandbox {
  14
  15 class SANDBOX_EXPORT ThreadHelpers {
  16  public:
  17   // Check whether the current process is single threaded. |proc_self_tasks|
  18   // can be a file descriptor to /proc/self/task/ and remains owned by the
  19   // caller or -1.
  20   // If |proc_self_tasks| is -1, this method will open /proc/self/task/ and
  21   // crash if it cannot.
  22   static bool IsSingleThreaded(int proc_self_task);
  23
  24   // Stop |thread| and ensure that it does not have an entry in
  25   // /proc/self/task/ from the point of view of the current thread. This is
  26   // the way to stop threads before calling IsSingleThreaded().
  27   static bool StopThreadAndWatchProcFS(int proc_self_tasks,
  28                                        base::Thread* thread);
  29
  30  private:
  31   DISALLOW_IMPLICIT_CONSTRUCTORS(ThreadHelpers);
  32 };
  33
  34 }  // namespace sandbox
  35
  36 #endif  // SANDBOX_LINUX_SERVICES_THREAD_HELPERS_H_