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/** @file
* IPRT - Memory Allocation Pool.
*/
/*
* Copyright (C) 2009-2025 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef IPRT_INCLUDED_mempool_h
#define IPRT_INCLUDED_mempool_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/types.h>
RT_C_DECLS_BEGIN
/**
* Creates a new memory pool.
*
* @returns IPRT status code.
*
* @param phMemPool Where to return the handle to the new memory
* pool.
* @param pszName The name of the pool (for debug purposes).
*/
RTDECL(int) RTMemPoolCreate(PRTMEMPOOL phMemPool, const char *pszName);
/**
* Destroys the specified pool, freeing all the memory it contains.
*
* @returns IPRT status code.
*
* @param hMemPool The handle to the pool. The nil handle and
* RTMEMPOOL_DEFAULT are quietly ignored (retval
* VINF_SUCCESS).
*/
RTDECL(int) RTMemPoolDestroy(RTMEMPOOL hMemPool);
/**
* Allocates memory.
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
*
* @param hMemPool Handle to the pool to allocate the memory from.
* @param cb Size in bytes of the memory block to allocated.
*/
RTDECL(void *) RTMemPoolAlloc(RTMEMPOOL hMemPool, size_t cb) RT_NO_THROW_PROTO;
/**
* Allocates zero'd memory.
*
* Instead of memset(pv, 0, sizeof()) use this when you want zero'd
* memory. This keeps the code smaller and the heap can skip the memset
* in about 0.42% of calls :-).
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
*
* @param hMemPool Handle to the pool to allocate the memory from.
* @param cb Size in bytes of the memory block to allocated.
*/
RTDECL(void *) RTMemPoolAllocZ(RTMEMPOOL hMemPool, size_t cb) RT_NO_THROW_PROTO;
/**
* Duplicates a chunk of memory into a new heap block.
*
* @returns New heap block with the duplicate data.
* @returns NULL if we're out of memory.
*
* @param hMemPool Handle to the pool to allocate the memory from.
* @param pvSrc The memory to duplicate.
* @param cb The amount of memory to duplicate.
*/
RTDECL(void *) RTMemPoolDup(RTMEMPOOL hMemPool, const void *pvSrc, size_t cb) RT_NO_THROW_PROTO;
/**
* Duplicates a chunk of memory into a new heap block with some
* additional zeroed memory.
*
* @returns New heap block with the duplicate data.
* @returns NULL if we're out of memory.
*
* @param hMemPool Handle to the pool to allocate the memory from.
* @param pvSrc The memory to duplicate.
* @param cbSrc The amount of memory to duplicate.
* @param cbExtra The amount of extra memory to allocate and zero.
*/
RTDECL(void *) RTMemPoolDupEx(RTMEMPOOL hMemPool, const void *pvSrc, size_t cbSrc, size_t cbExtra) RT_NO_THROW_PROTO;
/**
* Reallocates memory.
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
*
* @param hMemPool Handle to the pool containing the old memory.
* @param pvOld The memory block to reallocate.
* @param cbNew The new block size (in bytes).
*/
RTDECL(void *) RTMemPoolRealloc(RTMEMPOOL hMemPool, void *pvOld, size_t cbNew) RT_NO_THROW_PROTO;
/**
* Frees memory allocated from a pool.
*
* @param hMemPool Handle to the pool containing the memory. Passing
* NIL here is fine, but it may come at a slight
* performance cost.
* @param pv Pointer to memory block.
*
* @remarks This is the same a RTMemPoolRelease but included here as a separate
* function to simplify code migration.
*/
RTDECL(void) RTMemPoolFree(RTMEMPOOL hMemPool, void *pv) RT_NO_THROW_PROTO;
/**
* Retains a reference to a memory block in a pool.
*
* @returns New reference count, UINT32_MAX on error (asserted).
*
* @param pv Pointer to memory block.
*/
RTDECL(uint32_t) RTMemPoolRetain(void *pv) RT_NO_THROW_PROTO;
/**
* Releases a reference to a memory block in a pool.
*
* @returns New reference count, UINT32_MAX on error (asserted).
*
* @param hMemPool Handle to the pool containing the memory. Passing
* NIL here is fine, but it may come at a slight
* performance cost.
* @param pv Pointer to memory block.
*/
RTDECL(uint32_t) RTMemPoolRelease(RTMEMPOOL hMemPool, void *pv) RT_NO_THROW_PROTO;
/**
* Get the current reference count.
*
* @returns The reference count, UINT32_MAX on error (asserted).
* @param pv Pointer to memory block.
*/
RTDECL(uint32_t) RTMemPoolRefCount(void *pv) RT_NO_THROW_PROTO;
RT_C_DECLS_END
#endif /* !IPRT_INCLUDED_mempool_h */
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