text: // Copyright (c) 2014 Marshall A. Greenblatt. Portions copyright (c) 2011
  // Google Inc. All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //    * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //    * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //    * Neither the name of Google Inc. nor the name Chromium Embedded
  // Framework nor the names of its contributors may be used to endorse
  // or promote products derived from this software without specific prior
  // written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  // WARNING: You should *NOT* be using this class directly.  PlatformThread is
  // the low-level platform-specific abstraction to the OS's threading interface.
  // You should instead be using a message-loop driven Thread, see thread.h.
  
  #ifndef CEF_INCLUDE_BASE_PLATFORM_THREAD_H_
  #define CEF_INCLUDE_BASE_PLATFORM_THREAD_H_
  
  #if defined(BASE_THREADING_PLATFORM_THREAD_H_)
  // Do nothing if the Chromium header has already been included.
  // This can happen in cases where Chromium code is used directly by the
  // client application. When using Chromium code directly always include
  // the Chromium header first to avoid type conflicts.
  #elif defined(BUILDING_CEF_SHARED)
  // When building CEF include the Chromium header directly.
  #include "base/threading/platform_thread.h"
  #else  // !BUILDING_CEF_SHARED
  // The following is substantially similar to the Chromium implementation.
  // If the Chromium implementation diverges the below implementation should be
  // updated to match.
  
  #include "include/base/cef_basictypes.h"
  #include "include/base/cef_build.h"
  #include "include/internal/cef_thread_internal.h"
  
  namespace base {
  
  // Used for logging. Always an integer value.
  typedef cef_platform_thread_id_t PlatformThreadId;
  
  // Used for thread checking and debugging.
  // Meant to be as fast as possible.
  // These are produced by PlatformThread::CurrentRef(), and used to later
  // check if we are on the same thread or not by using ==. These are safe
  // to copy between threads, but can't be copied to another process as they
  // have no meaning there. Also, the internal identifier can be re-used
  // after a thread dies, so a PlatformThreadRef cannot be reliably used
  // to distinguish a new thread from an old, dead thread.
  class PlatformThreadRef {
   public:
    typedef cef_platform_thread_handle_t RefType;
  
    PlatformThreadRef()
        : id_(0) {
    }
  
    explicit PlatformThreadRef(RefType id)
        : id_(id) {
    }
  
    bool operator==(PlatformThreadRef other) const {
      return id_ == other.id_;
    }
  
    bool is_null() const {
      return id_ == 0;
    }
   private:
    RefType id_;
  };
  
  // A namespace for low-level thread functions.
  // Chromium uses a class with static methods but CEF uses an actual namespace
  // to avoid linker problems with the sandbox libaries on Windows.
  namespace PlatformThread {
  
  // Gets the current thread id, which may be useful for logging purposes.
  inline PlatformThreadId CurrentId() {
    return cef_get_current_platform_thread_id();
  }
  
  // Gets the current thread reference, which can be used to check if
  // we're on the right thread quickly.
  inline PlatformThreadRef CurrentRef() {
    return PlatformThreadRef(cef_get_current_platform_thread_handle());
  }
  
  }  // namespace PlatformThread
  
  }  // namespace base
  
  #endif  // !BUILDING_CEF_SHARED
  
  #endif  // CEF_INCLUDE_BASE_PLATFORM_THREAD_H_
  