src/Thread/Handle.hpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #ifndef XCSOAR_THREAD_HANDLE_HPP
  25 #define XCSOAR_THREAD_HANDLE_HPP
  26
  27 #include "Compiler.h"
  28
  29 #ifdef HAVE_POSIX
  30 #include <pthread.h>
  31 #else
  32 #include <windows.h>
  33 #endif
  34
  35 /**
  36  * A low-level handle for a thread.  Designed to work with existing
  37  * threads, such as the main thread.  Mostly useful for debugging
  38  * code.
  39  */
  40 class ThreadHandle {
  41 #ifdef HAVE_POSIX
  42   pthread_t handle;
  43 #else
  44   DWORD handle;
  45 #endif
  46
  47 public:
  48   /**
  49    * No initialisation.
  50    */
  51   ThreadHandle() = default;
  52
  53 #ifdef HAVE_POSIX
  54   constexpr ThreadHandle(pthread_t _handle):handle(_handle) {}
  55 #else
  56   constexpr ThreadHandle(DWORD _handle):handle(_handle) {}
  57 #endif
  58
  59   static const ThreadHandle GetCurrent() {
  60 #ifdef HAVE_POSIX
  61     return pthread_self();
  62 #else
  63     return ::GetCurrentThreadId();
  64 #endif
  65   }
  66
  67   gcc_pure
  68   bool operator==(const ThreadHandle &other) const {
  69 #ifdef HAVE_POSIX
  70     return pthread_equal(handle, other.handle);
  71 #else
  72     return handle == other.handle;
  73 #endif
  74   }
  75
  76   /**
  77    * Check if this thread is the current thread.
  78    */
  79   bool IsInside() const {
  80     return *this == GetCurrent();
  81   }
  82 };
  83
  84 #endif