/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 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 Nokia Corporation 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 HOLDER 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.

*

* Description:

*

*/

#ifndef __G_LOW_MEM_H__

#define __G_LOW_MEM_H__

#include <unistd.h> 

#include <setjmp.h>

/*-------------------------- Data Structure Decleration ----------------*/

typedef struct _cleanUpStack cleanUpStack ;

typedef struct _mem_info mem_info ;

struct _cleanUpStack

{

	void *ptr[1000];

	int top;

};

struct _mem_info

{

	int is_setjmp_called;

	jmp_buf buf;

	cleanUpStack stack;

};

/*--------------------Function declerations------------------*/ 

#ifdef __cplusplus

extern "C"

{

#endif    /* __cplusplus */

IMPORT_C mem_info * _get_thread_specific_data();

IMPORT_C int _set_thread_specific_data(mem_info *m);

IMPORT_C int _push(cleanUpStack *cs,void *ptr);

IMPORT_C void *_pop(cleanUpStack *cs);

IMPORT_C void _findAndDestroy(cleanUpStack *cs,void *ptr);

IMPORT_C void _destroCleanUpStack(cleanUpStack *cs);

IMPORT_C void _clearCleanUpStack(cleanUpStack *cs);

IMPORT_C void * _pAlloc(size_t size);

IMPORT_C void _dummy1();

IMPORT_C void _dummy2();

IMPORT_C void _dummy3();

#ifdef __cplusplus

}

#endif    /* __cplusplus */

/*--------------------MACRO declerations------------------*/

#define SET_LOW_MEMORY_TRAP_VOID()	\

gboolean did_i_set = FALSE;\

{\

	mem_info *m = _get_thread_specific_data();\

	if(m == NULL)\

	{\

		m = (mem_info *)_pAlloc(sizeof(mem_info));\

		if(!m)\

			return;\

		m->is_setjmp_called = FALSE;\

		_clearCleanUpStack(&(m->stack));\

		if(_set_thread_specific_data(m))\

			return;\

	}\

	if(!m->is_setjmp_called)\

	{\

  		if(setjmp(m->buf) > 0)\

  		{\

  			m->is_setjmp_called = FALSE;\

  			_destroCleanUpStack(&(m->stack));\

  			return ;\

  		}\

  		m->is_setjmp_called = TRUE;\

  		did_i_set = TRUE;\

  	}\

}

#define SET_LOW_MEMORY_TRAP(failure_value)	\

gboolean did_i_set = FALSE;\

{\

	mem_info *m = _get_thread_specific_data();\

	if(m == NULL)\

	{\

		m = (mem_info *)_pAlloc(sizeof(mem_info));\

		if(!m)\

			return failure_value;\

		m->is_setjmp_called = FALSE;\

		_clearCleanUpStack(&(m->stack));\

		if(_set_thread_specific_data(m))\

			return failure_value;\

	}\

	if(!m->is_setjmp_called)\

	{\

  		if(setjmp(m->buf) > 0)\

  		{\

  			m->is_setjmp_called = FALSE;\

  			_destroCleanUpStack(&(m->stack));\

  			return failure_value;\

  		}\

  		m->is_setjmp_called = TRUE;\

  		did_i_set = TRUE;\

  	}\

}

#define REMOVE_LOW_MEMORY_TRAP()	{\

if(did_i_set)\

	{\

	mem_info *m = _get_thread_specific_data();\

	if(m)\

		m->is_setjmp_called = FALSE;\

		_clearCleanUpStack(&(m->stack));\

	}\

}

#endif /* __G_LOW_MEM_H__ */