s_internal.h

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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
 
/******************************************************************************/
/******************************************************************************/
/* WARNING!!!! do NOT add this header in any include file or any code file    */
/*             not being a modapi file!!!!!!!!                                */
/******************************************************************************/
/******************************************************************************/
 
#pragma once
 
#include <thread>
#include "common/c_internal.h"
#include "cpp_api/s_base.h"
#include "threading/mutex_auto_lock.h"
 
#ifdef SCRIPTAPI_LOCK_DEBUG
#include <cassert>
 
class LockChecker {
public:
        LockChecker(int *recursion_counter, std::thread::id *owning_thread)
        {
                m_lock_recursion_counter = recursion_counter;
                m_owning_thread          = owning_thread;
                m_original_level         = *recursion_counter;
 
                if (*m_lock_recursion_counter > 0) {
                        assert(*m_owning_thread == std::this_thread::get_id());
                } else {
                        *m_owning_thread = std::this_thread::get_id();
                }
 
                (*m_lock_recursion_counter)++;
        }
 
        ~LockChecker()
        {
                assert(*m_owning_thread == std::this_thread::get_id());
                assert(*m_lock_recursion_counter > 0);
 
                (*m_lock_recursion_counter)--;
 
                assert(*m_lock_recursion_counter == m_original_level);
        }
 
private:
        int *m_lock_recursion_counter;
        int m_original_level;
        std::thread::id *m_owning_thread;
};
 
#define SCRIPTAPI_LOCK_CHECK           \
        LockChecker scriptlock_checker(    \
                &this->m_lock_recursion_count, \
                &this->m_owning_thread)
 
#else
        #define SCRIPTAPI_LOCK_CHECK while(0)
#endif
 
#define SCRIPTAPI_PRECHECKHEADER                                               \
                RecursiveMutexAutoLock scriptlock(this->m_luastackmutex);              \
                SCRIPTAPI_LOCK_CHECK;                                                  \
                realityCheck();                                                        \
                lua_State *L = getStack();                                             \
                assert(lua_checkstack(L, 20));                                         \
                StackUnroller stack_unroller(L);