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source: vbox/trunk/include/iprt/mempool.h@ 103224

Last change on this file since 103224 was 98103, checked in by vboxsync, 21 months ago

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1/** @file
2 * IPRT - Memory Allocation Pool.
3 */
4
5/*
6 * Copyright (C) 2009-2023 Oracle and/or its affiliates.
7 *
8 * This file is part of VirtualBox base platform packages, as
9 * available from https://www.virtualbox.org.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation, in version 3 of the
14 * License.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, see <https://www.gnu.org/licenses>.
23 *
24 * The contents of this file may alternatively be used under the terms
25 * of the Common Development and Distribution License Version 1.0
26 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
27 * in the VirtualBox distribution, in which case the provisions of the
28 * CDDL are applicable instead of those of the GPL.
29 *
30 * You may elect to license modified versions of this file under the
31 * terms and conditions of either the GPL or the CDDL or both.
32 *
33 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
34 */
35
36#ifndef IPRT_INCLUDED_mempool_h
37#define IPRT_INCLUDED_mempool_h
38#ifndef RT_WITHOUT_PRAGMA_ONCE
39# pragma once
40#endif
41
42#include <iprt/types.h>
43
44RT_C_DECLS_BEGIN
45
46/**
47 * Creates a new memory pool.
48 *
49 * @returns IPRT status code.
50 *
51 * @param phMemPool Where to return the handle to the new memory
52 * pool.
53 * @param pszName The name of the pool (for debug purposes).
54 */
55RTDECL(int) RTMemPoolCreate(PRTMEMPOOL phMemPool, const char *pszName);
56
57/**
58 * Destroys the specified pool, freeing all the memory it contains.
59 *
60 * @returns IPRT status code.
61 *
62 * @param hMemPool The handle to the pool. The nil handle and
63 * RTMEMPOOL_DEFAULT are quietly ignored (retval
64 * VINF_SUCCESS).
65 */
66RTDECL(int) RTMemPoolDestroy(RTMEMPOOL hMemPool);
67
68/**
69 * Allocates memory.
70 *
71 * @returns Pointer to the allocated memory.
72 * @returns NULL on failure.
73 *
74 * @param hMemPool Handle to the pool to allocate the memory from.
75 * @param cb Size in bytes of the memory block to allocated.
76 */
77RTDECL(void *) RTMemPoolAlloc(RTMEMPOOL hMemPool, size_t cb) RT_NO_THROW_PROTO;
78
79/**
80 * Allocates zero'd memory.
81 *
82 * Instead of memset(pv, 0, sizeof()) use this when you want zero'd
83 * memory. This keeps the code smaller and the heap can skip the memset
84 * in about 0.42% of calls :-).
85 *
86 * @returns Pointer to the allocated memory.
87 * @returns NULL on failure.
88 *
89 * @param hMemPool Handle to the pool to allocate the memory from.
90 * @param cb Size in bytes of the memory block to allocated.
91 */
92RTDECL(void *) RTMemPoolAllocZ(RTMEMPOOL hMemPool, size_t cb) RT_NO_THROW_PROTO;
93
94/**
95 * Duplicates a chunk of memory into a new heap block.
96 *
97 * @returns New heap block with the duplicate data.
98 * @returns NULL if we're out of memory.
99 *
100 * @param hMemPool Handle to the pool to allocate the memory from.
101 * @param pvSrc The memory to duplicate.
102 * @param cb The amount of memory to duplicate.
103 */
104RTDECL(void *) RTMemPoolDup(RTMEMPOOL hMemPool, const void *pvSrc, size_t cb) RT_NO_THROW_PROTO;
105
106/**
107 * Duplicates a chunk of memory into a new heap block with some
108 * additional zeroed memory.
109 *
110 * @returns New heap block with the duplicate data.
111 * @returns NULL if we're out of memory.
112 *
113 * @param hMemPool Handle to the pool to allocate the memory from.
114 * @param pvSrc The memory to duplicate.
115 * @param cbSrc The amount of memory to duplicate.
116 * @param cbExtra The amount of extra memory to allocate and zero.
117 */
118RTDECL(void *) RTMemPoolDupEx(RTMEMPOOL hMemPool, const void *pvSrc, size_t cbSrc, size_t cbExtra) RT_NO_THROW_PROTO;
119
120/**
121 * Reallocates memory.
122 *
123 * @returns Pointer to the allocated memory.
124 * @returns NULL on failure.
125 *
126 * @param hMemPool Handle to the pool containing the old memory.
127 * @param pvOld The memory block to reallocate.
128 * @param cbNew The new block size (in bytes).
129 */
130RTDECL(void *) RTMemPoolRealloc(RTMEMPOOL hMemPool, void *pvOld, size_t cbNew) RT_NO_THROW_PROTO;
131
132/**
133 * Frees memory allocated from a pool.
134 *
135 * @param hMemPool Handle to the pool containing the memory. Passing
136 * NIL here is fine, but it may come at a slight
137 * performance cost.
138 * @param pv Pointer to memory block.
139 *
140 * @remarks This is the same a RTMemPoolRelease but included here as a separate
141 * function to simplify code migration.
142 */
143RTDECL(void) RTMemPoolFree(RTMEMPOOL hMemPool, void *pv) RT_NO_THROW_PROTO;
144
145/**
146 * Retains a reference to a memory block in a pool.
147 *
148 * @returns New reference count, UINT32_MAX on error (asserted).
149 *
150 * @param pv Pointer to memory block.
151 */
152RTDECL(uint32_t) RTMemPoolRetain(void *pv) RT_NO_THROW_PROTO;
153
154/**
155 * Releases a reference to a memory block in a pool.
156 *
157 * @returns New reference count, UINT32_MAX on error (asserted).
158 *
159 * @param hMemPool Handle to the pool containing the memory. Passing
160 * NIL here is fine, but it may come at a slight
161 * performance cost.
162 * @param pv Pointer to memory block.
163 */
164RTDECL(uint32_t) RTMemPoolRelease(RTMEMPOOL hMemPool, void *pv) RT_NO_THROW_PROTO;
165
166/**
167 * Get the current reference count.
168 *
169 * @returns The reference count, UINT32_MAX on error (asserted).
170 * @param pv Pointer to memory block.
171 */
172RTDECL(uint32_t) RTMemPoolRefCount(void *pv) RT_NO_THROW_PROTO;
173
174
175RT_C_DECLS_END
176
177#endif /* !IPRT_INCLUDED_mempool_h */
178
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