michael@0: // Copyright (c) 2011 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #ifndef BASE_THREADING_THREAD_CHECKER_IMPL_H_
michael@0: #define BASE_THREADING_THREAD_CHECKER_IMPL_H_
michael@0: 
michael@0: #include "base/base_export.h"
michael@0: #include "base/synchronization/lock.h"
michael@0: #include "base/threading/platform_thread.h"
michael@0: 
michael@0: namespace base {
michael@0: 
michael@0: // Real implementation of ThreadChecker, for use in debug mode, or
michael@0: // for temporary use in release mode (e.g. to CHECK on a threading issue
michael@0: // seen only in the wild).
michael@0: //
michael@0: // Note: You should almost always use the ThreadChecker class to get the
michael@0: // right version for your build configuration.
michael@0: class BASE_EXPORT ThreadCheckerImpl {
michael@0:  public:
michael@0:   ThreadCheckerImpl();
michael@0:   ~ThreadCheckerImpl();
michael@0: 
michael@0:   bool CalledOnValidThread() const;
michael@0: 
michael@0:   // Changes the thread that is checked for in CalledOnValidThread.  This may
michael@0:   // be useful when an object may be created on one thread and then used
michael@0:   // exclusively on another thread.
michael@0:   void DetachFromThread();
michael@0: 
michael@0:  private:
michael@0:   void EnsureThreadIdAssigned() const;
michael@0: 
michael@0:   mutable base::Lock lock_;
michael@0:   // This is mutable so that CalledOnValidThread can set it.
michael@0:   // It's guarded by |lock_|.
michael@0:   mutable PlatformThreadId valid_thread_id_;
michael@0: };
michael@0: 
michael@0: }  // namespace base
michael@0: 
michael@0: #endif  // BASE_THREADING_THREAD_CHECKER_IMPL_H_