src/script/cpp_api/s_internal.h

   1 /*
   2 Minetest
   3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 /******************************************************************************/
  21 /******************************************************************************/
  22 /* WARNING!!!! do NOT add this header in any include file or any code file    */
  23 /*             not being a modapi file!!!!!!!!                                */
  24 /******************************************************************************/
  25 /******************************************************************************/
  26
  27 #pragma once
  28
  29 #include <thread>
  30 #include "common/c_internal.h"
  31 #include "cpp_api/s_base.h"
  32 #include "threading/mutex_auto_lock.h"
  33
  34 #ifdef SCRIPTAPI_LOCK_DEBUG
  35 #include <cassert>
  36
  37 class LockChecker {
  38 public:
  39         LockChecker(int *recursion_counter, std::thread::id *owning_thread)
  40         {
  41                 m_lock_recursion_counter = recursion_counter;
  42                 m_owning_thread          = owning_thread;
  43                 m_original_level         = *recursion_counter;
  44
  45                 if (*m_lock_recursion_counter > 0) {
  46                         assert(*m_owning_thread == std::this_thread::get_id());
  47                 } else {
  48                         *m_owning_thread = std::this_thread::get_id();
  49                 }
  50
  51                 (*m_lock_recursion_counter)++;
  52         }
  53
  54         ~LockChecker()
  55         {
  56                 assert(*m_owning_thread == std::this_thread::get_id());
  57                 assert(*m_lock_recursion_counter > 0);
  58
  59                 (*m_lock_recursion_counter)--;
  60
  61                 assert(*m_lock_recursion_counter == m_original_level);
  62         }
  63
  64 private:
  65         int *m_lock_recursion_counter;
  66         int m_original_level;
  67         std::thread::id *m_owning_thread;
  68 };
  69
  70 #define SCRIPTAPI_LOCK_CHECK           \
  71         LockChecker scriptlock_checker(    \
  72                 &this->m_lock_recursion_count, \
  73                 &this->m_owning_thread)
  74
  75 #else
  76         #define SCRIPTAPI_LOCK_CHECK while(0)
  77 #endif
  78
  79 #define SCRIPTAPI_PRECHECKHEADER                                               \
  80                 RecursiveMutexAutoLock scriptlock(this->m_luastackmutex);              \
  81                 SCRIPTAPI_LOCK_CHECK;                                                  \
  82                 realityCheck();                                                        \
  83                 lua_State *L = getStack();                                             \
  84                 assert(lua_checkstack(L, 20));                                         \
  85                 StackUnroller stack_unroller(L);