/** 
 * @file llmemory.h
 * @brief Memory allocation/deallocation header-stuff goes here.
 *
 * $LicenseInfo:firstyear=2002&license=viewergpl$
 * 
 * Copyright (c) 2002-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
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 */
#ifndef LLMEMORY_H
#define LLMEMORY_H

#include <stdlib.h>

// A not necessarily efficient, but general, aligned malloc http://stackoverflow.com/questions/196329/osx-lacks-memalign
inline void* ll_aligned_malloc( size_t size, int align )
{
	void* mem = malloc( size + (align - 1) + sizeof(void*) );
	char* aligned = ((char*)mem) + sizeof(void*);
	aligned += align - ((uintptr_t)aligned & (align - 1));
	
	((void**)aligned)[-1] = mem;
	return aligned;
}

inline void ll_aligned_free( void* ptr )
{
	free( ((void**)ptr)[-1] );
}

inline void* ll_aligned_malloc_16(size_t size) // returned hunk MUST be freed with ll_aligned_free_16().
{
#if defined(LL_WINDOWS)
	return _mm_malloc(size, 16);
#elif defined(LL_DARWIN)
	return malloc(size); // default osx malloc is 16 byte aligned.
#else
	void *rtn;
	if (LL_LIKELY(0 == posix_memalign(&rtn, 16, size)))
		return rtn;
	else // bad alignment requested, or out of memory
		return NULL;
#endif
}

inline void ll_aligned_free_16(void *p)
{
#if defined(LL_WINDOWS)
	_mm_free(p);
#elif defined(LL_DARWIN)
	return free(p);
#else
	free(p); // posix_memalign() is compatible with heap deallocator
#endif
}

inline void* ll_aligned_malloc_32(size_t size) // returned hunk MUST be freed with ll_aligned_free_32().
{
#if defined(LL_WINDOWS)
	return _mm_malloc(size, 32);
#elif defined(LL_DARWIN)
	return ll_aligned_malloc( size, 32 );
#else
	void *rtn;
	if (LL_LIKELY(0 == posix_memalign(&rtn, 32, size)))
		return rtn;
	else // bad alignment requested, or out of memory
		return NULL;
#endif
}

inline void ll_aligned_free_32(void *p)
{
#if defined(LL_WINDOWS)
	_mm_free(p);
#elif defined(LL_DARWIN)
	ll_aligned_free( p );
#else
	free(p); // posix_memalign() is compatible with heap deallocator
#endif
}

class LL_COMMON_API LLMemory
{
public:
	static void initClass();
	static void cleanupClass();
	static void freeReserve();
	// Return the resident set size of the current process, in bytes.
	// Return value is zero if not known.
	static U64 getCurrentRSS();
private:
	static char* reserveMem;
};

// LLRefCount moved to llrefcount.h

// LLPointer moved to llpointer.h

// LLSafeHandle moved to llsafehandle.h

// LLSingleton moved to llsingleton.h

#endif