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lwip/core/mem.c@0:308f83189a3f, 2011-09-06 (annotated)
- Committer:
- mimil
- Date:
- Tue Sep 06 13:26:45 2011 +0000
- Revision:
- 0:308f83189a3f
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| mimil | 0:308f83189a3f | 1 | #pragma diag_remark 177 |
| mimil | 0:308f83189a3f | 2 | /** |
| mimil | 0:308f83189a3f | 3 | * @file |
| mimil | 0:308f83189a3f | 4 | * Dynamic memory manager |
| mimil | 0:308f83189a3f | 5 | * |
| mimil | 0:308f83189a3f | 6 | * This is a lightweight replacement for the standard C library malloc(). |
| mimil | 0:308f83189a3f | 7 | * |
| mimil | 0:308f83189a3f | 8 | * If you want to use the standard C library malloc() instead, define |
| mimil | 0:308f83189a3f | 9 | * MEM_LIBC_MALLOC to 1 in your lwipopts.h |
| mimil | 0:308f83189a3f | 10 | * |
| mimil | 0:308f83189a3f | 11 | * To let mem_malloc() use pools (prevents fragmentation and is much faster than |
| mimil | 0:308f83189a3f | 12 | * a heap but might waste some memory), define MEM_USE_POOLS to 1, define |
| mimil | 0:308f83189a3f | 13 | * MEM_USE_CUSTOM_POOLS to 1 and create a file "lwippools.h" that includes a list |
| mimil | 0:308f83189a3f | 14 | * of pools like this (more pools can be added between _START and _END): |
| mimil | 0:308f83189a3f | 15 | * |
| mimil | 0:308f83189a3f | 16 | * Define three pools with sizes 256, 512, and 1512 bytes |
| mimil | 0:308f83189a3f | 17 | * LWIP_MALLOC_MEMPOOL_START |
| mimil | 0:308f83189a3f | 18 | * LWIP_MALLOC_MEMPOOL(20, 256) |
| mimil | 0:308f83189a3f | 19 | * LWIP_MALLOC_MEMPOOL(10, 512) |
| mimil | 0:308f83189a3f | 20 | * LWIP_MALLOC_MEMPOOL(5, 1512) |
| mimil | 0:308f83189a3f | 21 | * LWIP_MALLOC_MEMPOOL_END |
| mimil | 0:308f83189a3f | 22 | */ |
| mimil | 0:308f83189a3f | 23 | |
| mimil | 0:308f83189a3f | 24 | /* |
| mimil | 0:308f83189a3f | 25 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| mimil | 0:308f83189a3f | 26 | * All rights reserved. |
| mimil | 0:308f83189a3f | 27 | * |
| mimil | 0:308f83189a3f | 28 | * Redistribution and use in source and binary forms, with or without modification, |
| mimil | 0:308f83189a3f | 29 | * are permitted provided that the following conditions are met: |
| mimil | 0:308f83189a3f | 30 | * |
| mimil | 0:308f83189a3f | 31 | * 1. Redistributions of source code must retain the above copyright notice, |
| mimil | 0:308f83189a3f | 32 | * this list of conditions and the following disclaimer. |
| mimil | 0:308f83189a3f | 33 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| mimil | 0:308f83189a3f | 34 | * this list of conditions and the following disclaimer in the documentation |
| mimil | 0:308f83189a3f | 35 | * and/or other materials provided with the distribution. |
| mimil | 0:308f83189a3f | 36 | * 3. The name of the author may not be used to endorse or promote products |
| mimil | 0:308f83189a3f | 37 | * derived from this software without specific prior written permission. |
| mimil | 0:308f83189a3f | 38 | * |
| mimil | 0:308f83189a3f | 39 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| mimil | 0:308f83189a3f | 40 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| mimil | 0:308f83189a3f | 41 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| mimil | 0:308f83189a3f | 42 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| mimil | 0:308f83189a3f | 43 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| mimil | 0:308f83189a3f | 44 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| mimil | 0:308f83189a3f | 45 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| mimil | 0:308f83189a3f | 46 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| mimil | 0:308f83189a3f | 47 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| mimil | 0:308f83189a3f | 48 | * OF SUCH DAMAGE. |
| mimil | 0:308f83189a3f | 49 | * |
| mimil | 0:308f83189a3f | 50 | * This file is part of the lwIP TCP/IP stack. |
| mimil | 0:308f83189a3f | 51 | * |
| mimil | 0:308f83189a3f | 52 | * Author: Adam Dunkels <adam@sics.se> |
| mimil | 0:308f83189a3f | 53 | * Simon Goldschmidt |
| mimil | 0:308f83189a3f | 54 | * |
| mimil | 0:308f83189a3f | 55 | */ |
| mimil | 0:308f83189a3f | 56 | |
| mimil | 0:308f83189a3f | 57 | #include "lwip/opt.h" |
| mimil | 0:308f83189a3f | 58 | |
| mimil | 0:308f83189a3f | 59 | #if !MEM_LIBC_MALLOC /* don't build if not configured for use in lwipopts.h */ |
| mimil | 0:308f83189a3f | 60 | |
| mimil | 0:308f83189a3f | 61 | #include "lwip/def.h" |
| mimil | 0:308f83189a3f | 62 | #include "lwip/mem.h" |
| mimil | 0:308f83189a3f | 63 | #include "lwip/sys.h" |
| mimil | 0:308f83189a3f | 64 | #include "lwip/stats.h" |
| mimil | 0:308f83189a3f | 65 | #include "lwip/err.h" |
| mimil | 0:308f83189a3f | 66 | |
| mimil | 0:308f83189a3f | 67 | #include <string.h> |
| mimil | 0:308f83189a3f | 68 | |
| mimil | 0:308f83189a3f | 69 | #if MEM_USE_POOLS |
| mimil | 0:308f83189a3f | 70 | /* lwIP head implemented with different sized pools */ |
| mimil | 0:308f83189a3f | 71 | |
| mimil | 0:308f83189a3f | 72 | /** |
| mimil | 0:308f83189a3f | 73 | * Allocate memory: determine the smallest pool that is big enough |
| mimil | 0:308f83189a3f | 74 | * to contain an element of 'size' and get an element from that pool. |
| mimil | 0:308f83189a3f | 75 | * |
| mimil | 0:308f83189a3f | 76 | * @param size the size in bytes of the memory needed |
| mimil | 0:308f83189a3f | 77 | * @return a pointer to the allocated memory or NULL if the pool is empty |
| mimil | 0:308f83189a3f | 78 | */ |
| mimil | 0:308f83189a3f | 79 | void * |
| mimil | 0:308f83189a3f | 80 | mem_malloc(mem_size_t size) |
| mimil | 0:308f83189a3f | 81 | { |
| mimil | 0:308f83189a3f | 82 | struct memp_malloc_helper *element; |
| mimil | 0:308f83189a3f | 83 | memp_t poolnr; |
| mimil | 0:308f83189a3f | 84 | mem_size_t required_size = size + sizeof(struct memp_malloc_helper); |
| mimil | 0:308f83189a3f | 85 | |
| mimil | 0:308f83189a3f | 86 | for (poolnr = MEMP_POOL_FIRST; poolnr <= MEMP_POOL_LAST; poolnr = (memp_t)(poolnr + 1)) { |
| mimil | 0:308f83189a3f | 87 | #if MEM_USE_POOLS_TRY_BIGGER_POOL |
| mimil | 0:308f83189a3f | 88 | again: |
| mimil | 0:308f83189a3f | 89 | #endif /* MEM_USE_POOLS_TRY_BIGGER_POOL */ |
| mimil | 0:308f83189a3f | 90 | /* is this pool big enough to hold an element of the required size |
| mimil | 0:308f83189a3f | 91 | plus a struct memp_malloc_helper that saves the pool this element came from? */ |
| mimil | 0:308f83189a3f | 92 | if (required_size <= memp_sizes[poolnr]) { |
| mimil | 0:308f83189a3f | 93 | break; |
| mimil | 0:308f83189a3f | 94 | } |
| mimil | 0:308f83189a3f | 95 | } |
| mimil | 0:308f83189a3f | 96 | if (poolnr > MEMP_POOL_LAST) { |
| mimil | 0:308f83189a3f | 97 | LWIP_ASSERT("mem_malloc(): no pool is that big!", 0); |
| mimil | 0:308f83189a3f | 98 | return NULL; |
| mimil | 0:308f83189a3f | 99 | } |
| mimil | 0:308f83189a3f | 100 | element = (struct memp_malloc_helper*)memp_malloc(poolnr); |
| mimil | 0:308f83189a3f | 101 | if (element == NULL) { |
| mimil | 0:308f83189a3f | 102 | /* No need to DEBUGF or ASSERT: This error is already |
| mimil | 0:308f83189a3f | 103 | taken care of in memp.c */ |
| mimil | 0:308f83189a3f | 104 | #if MEM_USE_POOLS_TRY_BIGGER_POOL |
| mimil | 0:308f83189a3f | 105 | /** Try a bigger pool if this one is empty! */ |
| mimil | 0:308f83189a3f | 106 | if (poolnr < MEMP_POOL_LAST) { |
| mimil | 0:308f83189a3f | 107 | poolnr++; |
| mimil | 0:308f83189a3f | 108 | goto again; |
| mimil | 0:308f83189a3f | 109 | } |
| mimil | 0:308f83189a3f | 110 | #endif /* MEM_USE_POOLS_TRY_BIGGER_POOL */ |
| mimil | 0:308f83189a3f | 111 | return NULL; |
| mimil | 0:308f83189a3f | 112 | } |
| mimil | 0:308f83189a3f | 113 | |
| mimil | 0:308f83189a3f | 114 | /* save the pool number this element came from */ |
| mimil | 0:308f83189a3f | 115 | element->poolnr = poolnr; |
| mimil | 0:308f83189a3f | 116 | /* and return a pointer to the memory directly after the struct memp_malloc_helper */ |
| mimil | 0:308f83189a3f | 117 | element++; |
| mimil | 0:308f83189a3f | 118 | |
| mimil | 0:308f83189a3f | 119 | return element; |
| mimil | 0:308f83189a3f | 120 | } |
| mimil | 0:308f83189a3f | 121 | |
| mimil | 0:308f83189a3f | 122 | /** |
| mimil | 0:308f83189a3f | 123 | * Free memory previously allocated by mem_malloc. Loads the pool number |
| mimil | 0:308f83189a3f | 124 | * and calls memp_free with that pool number to put the element back into |
| mimil | 0:308f83189a3f | 125 | * its pool |
| mimil | 0:308f83189a3f | 126 | * |
| mimil | 0:308f83189a3f | 127 | * @param rmem the memory element to free |
| mimil | 0:308f83189a3f | 128 | */ |
| mimil | 0:308f83189a3f | 129 | void |
| mimil | 0:308f83189a3f | 130 | mem_free(void *rmem) |
| mimil | 0:308f83189a3f | 131 | { |
| mimil | 0:308f83189a3f | 132 | struct memp_malloc_helper *hmem = (struct memp_malloc_helper*)rmem; |
| mimil | 0:308f83189a3f | 133 | |
| mimil | 0:308f83189a3f | 134 | LWIP_ASSERT("rmem != NULL", (rmem != NULL)); |
| mimil | 0:308f83189a3f | 135 | LWIP_ASSERT("rmem == MEM_ALIGN(rmem)", (rmem == LWIP_MEM_ALIGN(rmem))); |
| mimil | 0:308f83189a3f | 136 | |
| mimil | 0:308f83189a3f | 137 | /* get the original struct memp_malloc_helper */ |
| mimil | 0:308f83189a3f | 138 | hmem--; |
| mimil | 0:308f83189a3f | 139 | |
| mimil | 0:308f83189a3f | 140 | LWIP_ASSERT("hmem != NULL", (hmem != NULL)); |
| mimil | 0:308f83189a3f | 141 | LWIP_ASSERT("hmem == MEM_ALIGN(hmem)", (hmem == LWIP_MEM_ALIGN(hmem))); |
| mimil | 0:308f83189a3f | 142 | LWIP_ASSERT("hmem->poolnr < MEMP_MAX", (hmem->poolnr < MEMP_MAX)); |
| mimil | 0:308f83189a3f | 143 | |
| mimil | 0:308f83189a3f | 144 | /* and put it in the pool we saved earlier */ |
| mimil | 0:308f83189a3f | 145 | memp_free(hmem->poolnr, hmem); |
| mimil | 0:308f83189a3f | 146 | } |
| mimil | 0:308f83189a3f | 147 | |
| mimil | 0:308f83189a3f | 148 | #else /* MEM_USE_POOLS */ |
| mimil | 0:308f83189a3f | 149 | /* lwIP replacement for your libc malloc() */ |
| mimil | 0:308f83189a3f | 150 | |
| mimil | 0:308f83189a3f | 151 | /** |
| mimil | 0:308f83189a3f | 152 | * The heap is made up as a list of structs of this type. |
| mimil | 0:308f83189a3f | 153 | * This does not have to be aligned since for getting its size, |
| mimil | 0:308f83189a3f | 154 | * we only use the macro SIZEOF_STRUCT_MEM, which automatically alignes. |
| mimil | 0:308f83189a3f | 155 | */ |
| mimil | 0:308f83189a3f | 156 | struct mem { |
| mimil | 0:308f83189a3f | 157 | /** index (-> ram[next]) of the next struct */ |
| mimil | 0:308f83189a3f | 158 | mem_size_t next; |
| mimil | 0:308f83189a3f | 159 | /** index (-> ram[prev]) of the previous struct */ |
| mimil | 0:308f83189a3f | 160 | mem_size_t prev; |
| mimil | 0:308f83189a3f | 161 | /** 1: this area is used; 0: this area is unused */ |
| mimil | 0:308f83189a3f | 162 | u8_t used; |
| mimil | 0:308f83189a3f | 163 | }; |
| mimil | 0:308f83189a3f | 164 | |
| mimil | 0:308f83189a3f | 165 | /** All allocated blocks will be MIN_SIZE bytes big, at least! |
| mimil | 0:308f83189a3f | 166 | * MIN_SIZE can be overridden to suit your needs. Smaller values save space, |
| mimil | 0:308f83189a3f | 167 | * larger values could prevent too small blocks to fragment the RAM too much. */ |
| mimil | 0:308f83189a3f | 168 | #ifndef MIN_SIZE |
| mimil | 0:308f83189a3f | 169 | #define MIN_SIZE 12 |
| mimil | 0:308f83189a3f | 170 | #endif /* MIN_SIZE */ |
| mimil | 0:308f83189a3f | 171 | /* some alignment macros: we define them here for better source code layout */ |
| mimil | 0:308f83189a3f | 172 | #define MIN_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MIN_SIZE) |
| mimil | 0:308f83189a3f | 173 | #define SIZEOF_STRUCT_MEM LWIP_MEM_ALIGN_SIZE(sizeof(struct mem)) |
| mimil | 0:308f83189a3f | 174 | #define MEM_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MEM_SIZE) |
| mimil | 0:308f83189a3f | 175 | |
| mimil | 0:308f83189a3f | 176 | /** If you want to relocate the heap to external memory, simply define |
| mimil | 0:308f83189a3f | 177 | * LWIP_RAM_HEAP_POINTER as a void-pointer to that location. |
| mimil | 0:308f83189a3f | 178 | * If so, make sure the memory at that location is big enough (see below on |
| mimil | 0:308f83189a3f | 179 | * how that space is calculated). */ |
| mimil | 0:308f83189a3f | 180 | #ifndef LWIP_RAM_HEAP_POINTER |
| mimil | 0:308f83189a3f | 181 | /** the heap. we need one struct mem at the end and some room for alignment */ |
| mimil | 0:308f83189a3f | 182 | u8_t ram_heap[MEM_SIZE_ALIGNED + (2*SIZEOF_STRUCT_MEM) + MEM_ALIGNMENT] MEM_POSITION; |
| mimil | 0:308f83189a3f | 183 | #define LWIP_RAM_HEAP_POINTER ram_heap |
| mimil | 0:308f83189a3f | 184 | #endif /* LWIP_RAM_HEAP_POINTER */ |
| mimil | 0:308f83189a3f | 185 | |
| mimil | 0:308f83189a3f | 186 | /** pointer to the heap (ram_heap): for alignment, ram is now a pointer instead of an array */ |
| mimil | 0:308f83189a3f | 187 | static u8_t *ram; |
| mimil | 0:308f83189a3f | 188 | /** the last entry, always unused! */ |
| mimil | 0:308f83189a3f | 189 | static struct mem *ram_end; |
| mimil | 0:308f83189a3f | 190 | /** pointer to the lowest free block, this is used for faster search */ |
| mimil | 0:308f83189a3f | 191 | static struct mem *lfree; |
| mimil | 0:308f83189a3f | 192 | |
| mimil | 0:308f83189a3f | 193 | /** concurrent access protection */ |
| mimil | 0:308f83189a3f | 194 | static sys_mutex_t mem_mutex; |
| mimil | 0:308f83189a3f | 195 | |
| mimil | 0:308f83189a3f | 196 | #if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT |
| mimil | 0:308f83189a3f | 197 | |
| mimil | 0:308f83189a3f | 198 | static volatile u8_t mem_free_count; |
| mimil | 0:308f83189a3f | 199 | |
| mimil | 0:308f83189a3f | 200 | /* Allow mem_free from other (e.g. interrupt) context */ |
| mimil | 0:308f83189a3f | 201 | #define LWIP_MEM_FREE_DECL_PROTECT() SYS_ARCH_DECL_PROTECT(lev_free) |
| mimil | 0:308f83189a3f | 202 | #define LWIP_MEM_FREE_PROTECT() SYS_ARCH_PROTECT(lev_free) |
| mimil | 0:308f83189a3f | 203 | #define LWIP_MEM_FREE_UNPROTECT() SYS_ARCH_UNPROTECT(lev_free) |
| mimil | 0:308f83189a3f | 204 | #define LWIP_MEM_ALLOC_DECL_PROTECT() SYS_ARCH_DECL_PROTECT(lev_alloc) |
| mimil | 0:308f83189a3f | 205 | #define LWIP_MEM_ALLOC_PROTECT() SYS_ARCH_PROTECT(lev_alloc) |
| mimil | 0:308f83189a3f | 206 | #define LWIP_MEM_ALLOC_UNPROTECT() SYS_ARCH_UNPROTECT(lev_alloc) |
| mimil | 0:308f83189a3f | 207 | |
| mimil | 0:308f83189a3f | 208 | #else /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */ |
| mimil | 0:308f83189a3f | 209 | |
| mimil | 0:308f83189a3f | 210 | /* Protect the heap only by using a semaphore */ |
| mimil | 0:308f83189a3f | 211 | #define LWIP_MEM_FREE_DECL_PROTECT() |
| mimil | 0:308f83189a3f | 212 | #define LWIP_MEM_FREE_PROTECT() sys_mutex_lock(&mem_mutex) |
| mimil | 0:308f83189a3f | 213 | #define LWIP_MEM_FREE_UNPROTECT() sys_mutex_unlock(&mem_mutex) |
| mimil | 0:308f83189a3f | 214 | /* mem_malloc is protected using semaphore AND LWIP_MEM_ALLOC_PROTECT */ |
| mimil | 0:308f83189a3f | 215 | #define LWIP_MEM_ALLOC_DECL_PROTECT() |
| mimil | 0:308f83189a3f | 216 | #define LWIP_MEM_ALLOC_PROTECT() |
| mimil | 0:308f83189a3f | 217 | #define LWIP_MEM_ALLOC_UNPROTECT() |
| mimil | 0:308f83189a3f | 218 | |
| mimil | 0:308f83189a3f | 219 | #endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */ |
| mimil | 0:308f83189a3f | 220 | |
| mimil | 0:308f83189a3f | 221 | |
| mimil | 0:308f83189a3f | 222 | /** |
| mimil | 0:308f83189a3f | 223 | * "Plug holes" by combining adjacent empty struct mems. |
| mimil | 0:308f83189a3f | 224 | * After this function is through, there should not exist |
| mimil | 0:308f83189a3f | 225 | * one empty struct mem pointing to another empty struct mem. |
| mimil | 0:308f83189a3f | 226 | * |
| mimil | 0:308f83189a3f | 227 | * @param mem this points to a struct mem which just has been freed |
| mimil | 0:308f83189a3f | 228 | * @internal this function is only called by mem_free() and mem_trim() |
| mimil | 0:308f83189a3f | 229 | * |
| mimil | 0:308f83189a3f | 230 | * This assumes access to the heap is protected by the calling function |
| mimil | 0:308f83189a3f | 231 | * already. |
| mimil | 0:308f83189a3f | 232 | */ |
| mimil | 0:308f83189a3f | 233 | static void |
| mimil | 0:308f83189a3f | 234 | plug_holes(struct mem *mem) |
| mimil | 0:308f83189a3f | 235 | { |
| mimil | 0:308f83189a3f | 236 | struct mem *nmem; |
| mimil | 0:308f83189a3f | 237 | struct mem *pmem; |
| mimil | 0:308f83189a3f | 238 | |
| mimil | 0:308f83189a3f | 239 | LWIP_ASSERT("plug_holes: mem >= ram", (u8_t *)mem >= ram); |
| mimil | 0:308f83189a3f | 240 | LWIP_ASSERT("plug_holes: mem < ram_end", (u8_t *)mem < (u8_t *)ram_end); |
| mimil | 0:308f83189a3f | 241 | LWIP_ASSERT("plug_holes: mem->used == 0", mem->used == 0); |
| mimil | 0:308f83189a3f | 242 | |
| mimil | 0:308f83189a3f | 243 | /* plug hole forward */ |
| mimil | 0:308f83189a3f | 244 | LWIP_ASSERT("plug_holes: mem->next <= MEM_SIZE_ALIGNED", mem->next <= MEM_SIZE_ALIGNED); |
| mimil | 0:308f83189a3f | 245 | |
| mimil | 0:308f83189a3f | 246 | nmem = (struct mem *)(void *)&ram[mem->next]; |
| mimil | 0:308f83189a3f | 247 | if (mem != nmem && nmem->used == 0 && (u8_t *)nmem != (u8_t *)ram_end) { |
| mimil | 0:308f83189a3f | 248 | /* if mem->next is unused and not end of ram, combine mem and mem->next */ |
| mimil | 0:308f83189a3f | 249 | if (lfree == nmem) { |
| mimil | 0:308f83189a3f | 250 | lfree = mem; |
| mimil | 0:308f83189a3f | 251 | } |
| mimil | 0:308f83189a3f | 252 | mem->next = nmem->next; |
| mimil | 0:308f83189a3f | 253 | ((struct mem *)(void *)&ram[nmem->next])->prev = (mem_size_t)((u8_t *)mem - ram); |
| mimil | 0:308f83189a3f | 254 | } |
| mimil | 0:308f83189a3f | 255 | |
| mimil | 0:308f83189a3f | 256 | /* plug hole backward */ |
| mimil | 0:308f83189a3f | 257 | pmem = (struct mem *)(void *)&ram[mem->prev]; |
| mimil | 0:308f83189a3f | 258 | if (pmem != mem && pmem->used == 0) { |
| mimil | 0:308f83189a3f | 259 | /* if mem->prev is unused, combine mem and mem->prev */ |
| mimil | 0:308f83189a3f | 260 | if (lfree == mem) { |
| mimil | 0:308f83189a3f | 261 | lfree = pmem; |
| mimil | 0:308f83189a3f | 262 | } |
| mimil | 0:308f83189a3f | 263 | pmem->next = mem->next; |
| mimil | 0:308f83189a3f | 264 | ((struct mem *)(void *)&ram[mem->next])->prev = (mem_size_t)((u8_t *)pmem - ram); |
| mimil | 0:308f83189a3f | 265 | } |
| mimil | 0:308f83189a3f | 266 | } |
| mimil | 0:308f83189a3f | 267 | |
| mimil | 0:308f83189a3f | 268 | /** |
| mimil | 0:308f83189a3f | 269 | * Zero the heap and initialize start, end and lowest-free |
| mimil | 0:308f83189a3f | 270 | */ |
| mimil | 0:308f83189a3f | 271 | void |
| mimil | 0:308f83189a3f | 272 | mem_init(void) |
| mimil | 0:308f83189a3f | 273 | { |
| mimil | 0:308f83189a3f | 274 | struct mem *mem; |
| mimil | 0:308f83189a3f | 275 | |
| mimil | 0:308f83189a3f | 276 | LWIP_ASSERT("Sanity check alignment", |
| mimil | 0:308f83189a3f | 277 | (SIZEOF_STRUCT_MEM & (MEM_ALIGNMENT-1)) == 0); |
| mimil | 0:308f83189a3f | 278 | |
| mimil | 0:308f83189a3f | 279 | /* align the heap */ |
| mimil | 0:308f83189a3f | 280 | ram = (u8_t *)LWIP_MEM_ALIGN(LWIP_RAM_HEAP_POINTER); |
| mimil | 0:308f83189a3f | 281 | /* initialize the start of the heap */ |
| mimil | 0:308f83189a3f | 282 | mem = (struct mem *)(void *)ram; |
| mimil | 0:308f83189a3f | 283 | mem->next = MEM_SIZE_ALIGNED; |
| mimil | 0:308f83189a3f | 284 | mem->prev = 0; |
| mimil | 0:308f83189a3f | 285 | mem->used = 0; |
| mimil | 0:308f83189a3f | 286 | /* initialize the end of the heap */ |
| mimil | 0:308f83189a3f | 287 | ram_end = (struct mem *)(void *)&ram[MEM_SIZE_ALIGNED]; |
| mimil | 0:308f83189a3f | 288 | ram_end->used = 1; |
| mimil | 0:308f83189a3f | 289 | ram_end->next = MEM_SIZE_ALIGNED; |
| mimil | 0:308f83189a3f | 290 | ram_end->prev = MEM_SIZE_ALIGNED; |
| mimil | 0:308f83189a3f | 291 | |
| mimil | 0:308f83189a3f | 292 | /* initialize the lowest-free pointer to the start of the heap */ |
| mimil | 0:308f83189a3f | 293 | lfree = (struct mem *)(void *)ram; |
| mimil | 0:308f83189a3f | 294 | |
| mimil | 0:308f83189a3f | 295 | MEM_STATS_AVAIL(avail, MEM_SIZE_ALIGNED); |
| mimil | 0:308f83189a3f | 296 | |
| mimil | 0:308f83189a3f | 297 | if(sys_mutex_new(&mem_mutex) != ERR_OK) { |
| mimil | 0:308f83189a3f | 298 | LWIP_ASSERT("failed to create mem_mutex", 0); |
| mimil | 0:308f83189a3f | 299 | } |
| mimil | 0:308f83189a3f | 300 | } |
| mimil | 0:308f83189a3f | 301 | |
| mimil | 0:308f83189a3f | 302 | /** |
| mimil | 0:308f83189a3f | 303 | * Put a struct mem back on the heap |
| mimil | 0:308f83189a3f | 304 | * |
| mimil | 0:308f83189a3f | 305 | * @param rmem is the data portion of a struct mem as returned by a previous |
| mimil | 0:308f83189a3f | 306 | * call to mem_malloc() |
| mimil | 0:308f83189a3f | 307 | */ |
| mimil | 0:308f83189a3f | 308 | void |
| mimil | 0:308f83189a3f | 309 | mem_free(void *rmem) |
| mimil | 0:308f83189a3f | 310 | { |
| mimil | 0:308f83189a3f | 311 | struct mem *mem; |
| mimil | 0:308f83189a3f | 312 | LWIP_MEM_FREE_DECL_PROTECT(); |
| mimil | 0:308f83189a3f | 313 | |
| mimil | 0:308f83189a3f | 314 | if (rmem == NULL) { |
| mimil | 0:308f83189a3f | 315 | LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("mem_free(p == NULL) was called.\n")); |
| mimil | 0:308f83189a3f | 316 | return; |
| mimil | 0:308f83189a3f | 317 | } |
| mimil | 0:308f83189a3f | 318 | LWIP_ASSERT("mem_free: sanity check alignment", (((mem_ptr_t)rmem) & (MEM_ALIGNMENT-1)) == 0); |
| mimil | 0:308f83189a3f | 319 | |
| mimil | 0:308f83189a3f | 320 | LWIP_ASSERT("mem_free: legal memory", (u8_t *)rmem >= (u8_t *)ram && |
| mimil | 0:308f83189a3f | 321 | (u8_t *)rmem < (u8_t *)ram_end); |
| mimil | 0:308f83189a3f | 322 | |
| mimil | 0:308f83189a3f | 323 | if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) { |
| mimil | 0:308f83189a3f | 324 | SYS_ARCH_DECL_PROTECT(lev); |
| mimil | 0:308f83189a3f | 325 | LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_LEVEL_SEVERE, ("mem_free: illegal memory\n")); |
| mimil | 0:308f83189a3f | 326 | /* protect mem stats from concurrent access */ |
| mimil | 0:308f83189a3f | 327 | SYS_ARCH_PROTECT(lev); |
| mimil | 0:308f83189a3f | 328 | MEM_STATS_INC(illegal); |
| mimil | 0:308f83189a3f | 329 | SYS_ARCH_UNPROTECT(lev); |
| mimil | 0:308f83189a3f | 330 | return; |
| mimil | 0:308f83189a3f | 331 | } |
| mimil | 0:308f83189a3f | 332 | /* protect the heap from concurrent access */ |
| mimil | 0:308f83189a3f | 333 | LWIP_MEM_FREE_PROTECT(); |
| mimil | 0:308f83189a3f | 334 | /* Get the corresponding struct mem ... */ |
| mimil | 0:308f83189a3f | 335 | mem = (struct mem *)(void *)((u8_t *)rmem - SIZEOF_STRUCT_MEM); |
| mimil | 0:308f83189a3f | 336 | /* ... which has to be in a used state ... */ |
| mimil | 0:308f83189a3f | 337 | LWIP_ASSERT("mem_free: mem->used", mem->used); |
| mimil | 0:308f83189a3f | 338 | /* ... and is now unused. */ |
| mimil | 0:308f83189a3f | 339 | mem->used = 0; |
| mimil | 0:308f83189a3f | 340 | |
| mimil | 0:308f83189a3f | 341 | if (mem < lfree) { |
| mimil | 0:308f83189a3f | 342 | /* the newly freed struct is now the lowest */ |
| mimil | 0:308f83189a3f | 343 | lfree = mem; |
| mimil | 0:308f83189a3f | 344 | } |
| mimil | 0:308f83189a3f | 345 | |
| mimil | 0:308f83189a3f | 346 | MEM_STATS_DEC_USED(used, mem->next - (mem_size_t)(((u8_t *)mem - ram))); |
| mimil | 0:308f83189a3f | 347 | |
| mimil | 0:308f83189a3f | 348 | /* finally, see if prev or next are free also */ |
| mimil | 0:308f83189a3f | 349 | plug_holes(mem); |
| mimil | 0:308f83189a3f | 350 | #if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT |
| mimil | 0:308f83189a3f | 351 | mem_free_count = 1; |
| mimil | 0:308f83189a3f | 352 | #endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */ |
| mimil | 0:308f83189a3f | 353 | LWIP_MEM_FREE_UNPROTECT(); |
| mimil | 0:308f83189a3f | 354 | } |
| mimil | 0:308f83189a3f | 355 | |
| mimil | 0:308f83189a3f | 356 | /** |
| mimil | 0:308f83189a3f | 357 | * Shrink memory returned by mem_malloc(). |
| mimil | 0:308f83189a3f | 358 | * |
| mimil | 0:308f83189a3f | 359 | * @param rmem pointer to memory allocated by mem_malloc the is to be shrinked |
| mimil | 0:308f83189a3f | 360 | * @param newsize required size after shrinking (needs to be smaller than or |
| mimil | 0:308f83189a3f | 361 | * equal to the previous size) |
| mimil | 0:308f83189a3f | 362 | * @return for compatibility reasons: is always == rmem, at the moment |
| mimil | 0:308f83189a3f | 363 | * or NULL if newsize is > old size, in which case rmem is NOT touched |
| mimil | 0:308f83189a3f | 364 | * or freed! |
| mimil | 0:308f83189a3f | 365 | */ |
| mimil | 0:308f83189a3f | 366 | void * |
| mimil | 0:308f83189a3f | 367 | mem_trim(void *rmem, mem_size_t newsize) |
| mimil | 0:308f83189a3f | 368 | { |
| mimil | 0:308f83189a3f | 369 | mem_size_t size; |
| mimil | 0:308f83189a3f | 370 | mem_size_t ptr, ptr2; |
| mimil | 0:308f83189a3f | 371 | struct mem *mem, *mem2; |
| mimil | 0:308f83189a3f | 372 | /* use the FREE_PROTECT here: it protects with sem OR SYS_ARCH_PROTECT */ |
| mimil | 0:308f83189a3f | 373 | LWIP_MEM_FREE_DECL_PROTECT(); |
| mimil | 0:308f83189a3f | 374 | |
| mimil | 0:308f83189a3f | 375 | /* Expand the size of the allocated memory region so that we can |
| mimil | 0:308f83189a3f | 376 | adjust for alignment. */ |
| mimil | 0:308f83189a3f | 377 | newsize = LWIP_MEM_ALIGN_SIZE(newsize); |
| mimil | 0:308f83189a3f | 378 | |
| mimil | 0:308f83189a3f | 379 | if(newsize < MIN_SIZE_ALIGNED) { |
| mimil | 0:308f83189a3f | 380 | /* every data block must be at least MIN_SIZE_ALIGNED long */ |
| mimil | 0:308f83189a3f | 381 | newsize = MIN_SIZE_ALIGNED; |
| mimil | 0:308f83189a3f | 382 | } |
| mimil | 0:308f83189a3f | 383 | |
| mimil | 0:308f83189a3f | 384 | if (newsize > MEM_SIZE_ALIGNED) { |
| mimil | 0:308f83189a3f | 385 | return NULL; |
| mimil | 0:308f83189a3f | 386 | } |
| mimil | 0:308f83189a3f | 387 | |
| mimil | 0:308f83189a3f | 388 | LWIP_ASSERT("mem_trim: legal memory", (u8_t *)rmem >= (u8_t *)ram && |
| mimil | 0:308f83189a3f | 389 | (u8_t *)rmem < (u8_t *)ram_end); |
| mimil | 0:308f83189a3f | 390 | |
| mimil | 0:308f83189a3f | 391 | if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) { |
| mimil | 0:308f83189a3f | 392 | SYS_ARCH_DECL_PROTECT(lev); |
| mimil | 0:308f83189a3f | 393 | LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_LEVEL_SEVERE, ("mem_trim: illegal memory\n")); |
| mimil | 0:308f83189a3f | 394 | /* protect mem stats from concurrent access */ |
| mimil | 0:308f83189a3f | 395 | SYS_ARCH_PROTECT(lev); |
| mimil | 0:308f83189a3f | 396 | MEM_STATS_INC(illegal); |
| mimil | 0:308f83189a3f | 397 | SYS_ARCH_UNPROTECT(lev); |
| mimil | 0:308f83189a3f | 398 | return rmem; |
| mimil | 0:308f83189a3f | 399 | } |
| mimil | 0:308f83189a3f | 400 | /* Get the corresponding struct mem ... */ |
| mimil | 0:308f83189a3f | 401 | mem = (struct mem *)(void *)((u8_t *)rmem - SIZEOF_STRUCT_MEM); |
| mimil | 0:308f83189a3f | 402 | /* ... and its offset pointer */ |
| mimil | 0:308f83189a3f | 403 | ptr = (mem_size_t)((u8_t *)mem - ram); |
| mimil | 0:308f83189a3f | 404 | |
| mimil | 0:308f83189a3f | 405 | size = mem->next - ptr - SIZEOF_STRUCT_MEM; |
| mimil | 0:308f83189a3f | 406 | LWIP_ASSERT("mem_trim can only shrink memory", newsize <= size); |
| mimil | 0:308f83189a3f | 407 | if (newsize > size) { |
| mimil | 0:308f83189a3f | 408 | /* not supported */ |
| mimil | 0:308f83189a3f | 409 | return NULL; |
| mimil | 0:308f83189a3f | 410 | } |
| mimil | 0:308f83189a3f | 411 | if (newsize == size) { |
| mimil | 0:308f83189a3f | 412 | /* No change in size, simply return */ |
| mimil | 0:308f83189a3f | 413 | return rmem; |
| mimil | 0:308f83189a3f | 414 | } |
| mimil | 0:308f83189a3f | 415 | |
| mimil | 0:308f83189a3f | 416 | /* protect the heap from concurrent access */ |
| mimil | 0:308f83189a3f | 417 | LWIP_MEM_FREE_PROTECT(); |
| mimil | 0:308f83189a3f | 418 | |
| mimil | 0:308f83189a3f | 419 | mem2 = (struct mem *)(void *)&ram[mem->next]; |
| mimil | 0:308f83189a3f | 420 | if(mem2->used == 0) { |
| mimil | 0:308f83189a3f | 421 | /* The next struct is unused, we can simply move it at little */ |
| mimil | 0:308f83189a3f | 422 | mem_size_t next; |
| mimil | 0:308f83189a3f | 423 | /* remember the old next pointer */ |
| mimil | 0:308f83189a3f | 424 | next = mem2->next; |
| mimil | 0:308f83189a3f | 425 | /* create new struct mem which is moved directly after the shrinked mem */ |
| mimil | 0:308f83189a3f | 426 | ptr2 = ptr + SIZEOF_STRUCT_MEM + newsize; |
| mimil | 0:308f83189a3f | 427 | if (lfree == mem2) { |
| mimil | 0:308f83189a3f | 428 | lfree = (struct mem *)(void *)&ram[ptr2]; |
| mimil | 0:308f83189a3f | 429 | } |
| mimil | 0:308f83189a3f | 430 | mem2 = (struct mem *)(void *)&ram[ptr2]; |
| mimil | 0:308f83189a3f | 431 | mem2->used = 0; |
| mimil | 0:308f83189a3f | 432 | /* restore the next pointer */ |
| mimil | 0:308f83189a3f | 433 | mem2->next = next; |
| mimil | 0:308f83189a3f | 434 | /* link it back to mem */ |
| mimil | 0:308f83189a3f | 435 | mem2->prev = ptr; |
| mimil | 0:308f83189a3f | 436 | /* link mem to it */ |
| mimil | 0:308f83189a3f | 437 | mem->next = ptr2; |
| mimil | 0:308f83189a3f | 438 | /* last thing to restore linked list: as we have moved mem2, |
| mimil | 0:308f83189a3f | 439 | * let 'mem2->next->prev' point to mem2 again. but only if mem2->next is not |
| mimil | 0:308f83189a3f | 440 | * the end of the heap */ |
| mimil | 0:308f83189a3f | 441 | if (mem2->next != MEM_SIZE_ALIGNED) { |
| mimil | 0:308f83189a3f | 442 | ((struct mem *)(void *)&ram[mem2->next])->prev = ptr2; |
| mimil | 0:308f83189a3f | 443 | } |
| mimil | 0:308f83189a3f | 444 | MEM_STATS_DEC_USED(used, (size - newsize)); |
| mimil | 0:308f83189a3f | 445 | /* no need to plug holes, we've already done that */ |
| mimil | 0:308f83189a3f | 446 | } else if (newsize + SIZEOF_STRUCT_MEM + MIN_SIZE_ALIGNED <= size) { |
| mimil | 0:308f83189a3f | 447 | /* Next struct is used but there's room for another struct mem with |
| mimil | 0:308f83189a3f | 448 | * at least MIN_SIZE_ALIGNED of data. |
| mimil | 0:308f83189a3f | 449 | * Old size ('size') must be big enough to contain at least 'newsize' plus a struct mem |
| mimil | 0:308f83189a3f | 450 | * ('SIZEOF_STRUCT_MEM') with some data ('MIN_SIZE_ALIGNED'). |
| mimil | 0:308f83189a3f | 451 | * @todo we could leave out MIN_SIZE_ALIGNED. We would create an empty |
| mimil | 0:308f83189a3f | 452 | * region that couldn't hold data, but when mem->next gets freed, |
| mimil | 0:308f83189a3f | 453 | * the 2 regions would be combined, resulting in more free memory */ |
| mimil | 0:308f83189a3f | 454 | ptr2 = ptr + SIZEOF_STRUCT_MEM + newsize; |
| mimil | 0:308f83189a3f | 455 | mem2 = (struct mem *)(void *)&ram[ptr2]; |
| mimil | 0:308f83189a3f | 456 | if (mem2 < lfree) { |
| mimil | 0:308f83189a3f | 457 | lfree = mem2; |
| mimil | 0:308f83189a3f | 458 | } |
| mimil | 0:308f83189a3f | 459 | mem2->used = 0; |
| mimil | 0:308f83189a3f | 460 | mem2->next = mem->next; |
| mimil | 0:308f83189a3f | 461 | mem2->prev = ptr; |
| mimil | 0:308f83189a3f | 462 | mem->next = ptr2; |
| mimil | 0:308f83189a3f | 463 | if (mem2->next != MEM_SIZE_ALIGNED) { |
| mimil | 0:308f83189a3f | 464 | ((struct mem *)(void *)&ram[mem2->next])->prev = ptr2; |
| mimil | 0:308f83189a3f | 465 | } |
| mimil | 0:308f83189a3f | 466 | MEM_STATS_DEC_USED(used, (size - newsize)); |
| mimil | 0:308f83189a3f | 467 | /* the original mem->next is used, so no need to plug holes! */ |
| mimil | 0:308f83189a3f | 468 | } |
| mimil | 0:308f83189a3f | 469 | /* else { |
| mimil | 0:308f83189a3f | 470 | next struct mem is used but size between mem and mem2 is not big enough |
| mimil | 0:308f83189a3f | 471 | to create another struct mem |
| mimil | 0:308f83189a3f | 472 | -> don't do anyhting. |
| mimil | 0:308f83189a3f | 473 | -> the remaining space stays unused since it is too small |
| mimil | 0:308f83189a3f | 474 | } */ |
| mimil | 0:308f83189a3f | 475 | #if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT |
| mimil | 0:308f83189a3f | 476 | mem_free_count = 1; |
| mimil | 0:308f83189a3f | 477 | #endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */ |
| mimil | 0:308f83189a3f | 478 | LWIP_MEM_FREE_UNPROTECT(); |
| mimil | 0:308f83189a3f | 479 | return rmem; |
| mimil | 0:308f83189a3f | 480 | } |
| mimil | 0:308f83189a3f | 481 | |
| mimil | 0:308f83189a3f | 482 | /** |
| mimil | 0:308f83189a3f | 483 | * Adam's mem_malloc() plus solution for bug #17922 |
| mimil | 0:308f83189a3f | 484 | * Allocate a block of memory with a minimum of 'size' bytes. |
| mimil | 0:308f83189a3f | 485 | * |
| mimil | 0:308f83189a3f | 486 | * @param size is the minimum size of the requested block in bytes. |
| mimil | 0:308f83189a3f | 487 | * @return pointer to allocated memory or NULL if no free memory was found. |
| mimil | 0:308f83189a3f | 488 | * |
| mimil | 0:308f83189a3f | 489 | * Note that the returned value will always be aligned (as defined by MEM_ALIGNMENT). |
| mimil | 0:308f83189a3f | 490 | */ |
| mimil | 0:308f83189a3f | 491 | void * |
| mimil | 0:308f83189a3f | 492 | mem_malloc(mem_size_t size) |
| mimil | 0:308f83189a3f | 493 | { |
| mimil | 0:308f83189a3f | 494 | mem_size_t ptr, ptr2; |
| mimil | 0:308f83189a3f | 495 | struct mem *mem, *mem2; |
| mimil | 0:308f83189a3f | 496 | #if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT |
| mimil | 0:308f83189a3f | 497 | u8_t local_mem_free_count = 0; |
| mimil | 0:308f83189a3f | 498 | #endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */ |
| mimil | 0:308f83189a3f | 499 | LWIP_MEM_ALLOC_DECL_PROTECT(); |
| mimil | 0:308f83189a3f | 500 | |
| mimil | 0:308f83189a3f | 501 | if (size == 0) { |
| mimil | 0:308f83189a3f | 502 | return NULL; |
| mimil | 0:308f83189a3f | 503 | } |
| mimil | 0:308f83189a3f | 504 | |
| mimil | 0:308f83189a3f | 505 | /* Expand the size of the allocated memory region so that we can |
| mimil | 0:308f83189a3f | 506 | adjust for alignment. */ |
| mimil | 0:308f83189a3f | 507 | size = LWIP_MEM_ALIGN_SIZE(size); |
| mimil | 0:308f83189a3f | 508 | |
| mimil | 0:308f83189a3f | 509 | if(size < MIN_SIZE_ALIGNED) { |
| mimil | 0:308f83189a3f | 510 | /* every data block must be at least MIN_SIZE_ALIGNED long */ |
| mimil | 0:308f83189a3f | 511 | size = MIN_SIZE_ALIGNED; |
| mimil | 0:308f83189a3f | 512 | } |
| mimil | 0:308f83189a3f | 513 | |
| mimil | 0:308f83189a3f | 514 | if (size > MEM_SIZE_ALIGNED) { |
| mimil | 0:308f83189a3f | 515 | return NULL; |
| mimil | 0:308f83189a3f | 516 | } |
| mimil | 0:308f83189a3f | 517 | |
| mimil | 0:308f83189a3f | 518 | /* protect the heap from concurrent access */ |
| mimil | 0:308f83189a3f | 519 | sys_mutex_lock(&mem_mutex); |
| mimil | 0:308f83189a3f | 520 | LWIP_MEM_ALLOC_PROTECT(); |
| mimil | 0:308f83189a3f | 521 | #if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT |
| mimil | 0:308f83189a3f | 522 | /* run as long as a mem_free disturbed mem_malloc */ |
| mimil | 0:308f83189a3f | 523 | do { |
| mimil | 0:308f83189a3f | 524 | local_mem_free_count = 0; |
| mimil | 0:308f83189a3f | 525 | #endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */ |
| mimil | 0:308f83189a3f | 526 | |
| mimil | 0:308f83189a3f | 527 | /* Scan through the heap searching for a free block that is big enough, |
| mimil | 0:308f83189a3f | 528 | * beginning with the lowest free block. |
| mimil | 0:308f83189a3f | 529 | */ |
| mimil | 0:308f83189a3f | 530 | for (ptr = (mem_size_t)((u8_t *)lfree - ram); ptr < MEM_SIZE_ALIGNED - size; |
| mimil | 0:308f83189a3f | 531 | ptr = ((struct mem *)(void *)&ram[ptr])->next) { |
| mimil | 0:308f83189a3f | 532 | mem = (struct mem *)(void *)&ram[ptr]; |
| mimil | 0:308f83189a3f | 533 | #if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT |
| mimil | 0:308f83189a3f | 534 | mem_free_count = 0; |
| mimil | 0:308f83189a3f | 535 | LWIP_MEM_ALLOC_UNPROTECT(); |
| mimil | 0:308f83189a3f | 536 | /* allow mem_free to run */ |
| mimil | 0:308f83189a3f | 537 | LWIP_MEM_ALLOC_PROTECT(); |
| mimil | 0:308f83189a3f | 538 | if (mem_free_count != 0) { |
| mimil | 0:308f83189a3f | 539 | local_mem_free_count = mem_free_count; |
| mimil | 0:308f83189a3f | 540 | } |
| mimil | 0:308f83189a3f | 541 | mem_free_count = 0; |
| mimil | 0:308f83189a3f | 542 | #endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */ |
| mimil | 0:308f83189a3f | 543 | |
| mimil | 0:308f83189a3f | 544 | if ((!mem->used) && |
| mimil | 0:308f83189a3f | 545 | (mem->next - (ptr + SIZEOF_STRUCT_MEM)) >= size) { |
| mimil | 0:308f83189a3f | 546 | /* mem is not used and at least perfect fit is possible: |
| mimil | 0:308f83189a3f | 547 | * mem->next - (ptr + SIZEOF_STRUCT_MEM) gives us the 'user data size' of mem */ |
| mimil | 0:308f83189a3f | 548 | |
| mimil | 0:308f83189a3f | 549 | if (mem->next - (ptr + SIZEOF_STRUCT_MEM) >= (size + SIZEOF_STRUCT_MEM + MIN_SIZE_ALIGNED)) { |
| mimil | 0:308f83189a3f | 550 | /* (in addition to the above, we test if another struct mem (SIZEOF_STRUCT_MEM) containing |
| mimil | 0:308f83189a3f | 551 | * at least MIN_SIZE_ALIGNED of data also fits in the 'user data space' of 'mem') |
| mimil | 0:308f83189a3f | 552 | * -> split large block, create empty remainder, |
| mimil | 0:308f83189a3f | 553 | * remainder must be large enough to contain MIN_SIZE_ALIGNED data: if |
| mimil | 0:308f83189a3f | 554 | * mem->next - (ptr + (2*SIZEOF_STRUCT_MEM)) == size, |
| mimil | 0:308f83189a3f | 555 | * struct mem would fit in but no data between mem2 and mem2->next |
| mimil | 0:308f83189a3f | 556 | * @todo we could leave out MIN_SIZE_ALIGNED. We would create an empty |
| mimil | 0:308f83189a3f | 557 | * region that couldn't hold data, but when mem->next gets freed, |
| mimil | 0:308f83189a3f | 558 | * the 2 regions would be combined, resulting in more free memory |
| mimil | 0:308f83189a3f | 559 | */ |
| mimil | 0:308f83189a3f | 560 | ptr2 = ptr + SIZEOF_STRUCT_MEM + size; |
| mimil | 0:308f83189a3f | 561 | /* create mem2 struct */ |
| mimil | 0:308f83189a3f | 562 | mem2 = (struct mem *)(void *)&ram[ptr2]; |
| mimil | 0:308f83189a3f | 563 | mem2->used = 0; |
| mimil | 0:308f83189a3f | 564 | mem2->next = mem->next; |
| mimil | 0:308f83189a3f | 565 | mem2->prev = ptr; |
| mimil | 0:308f83189a3f | 566 | /* and insert it between mem and mem->next */ |
| mimil | 0:308f83189a3f | 567 | mem->next = ptr2; |
| mimil | 0:308f83189a3f | 568 | mem->used = 1; |
| mimil | 0:308f83189a3f | 569 | |
| mimil | 0:308f83189a3f | 570 | if (mem2->next != MEM_SIZE_ALIGNED) { |
| mimil | 0:308f83189a3f | 571 | ((struct mem *)(void *)&ram[mem2->next])->prev = ptr2; |
| mimil | 0:308f83189a3f | 572 | } |
| mimil | 0:308f83189a3f | 573 | MEM_STATS_INC_USED(used, (size + SIZEOF_STRUCT_MEM)); |
| mimil | 0:308f83189a3f | 574 | } else { |
| mimil | 0:308f83189a3f | 575 | /* (a mem2 struct does no fit into the user data space of mem and mem->next will always |
| mimil | 0:308f83189a3f | 576 | * be used at this point: if not we have 2 unused structs in a row, plug_holes should have |
| mimil | 0:308f83189a3f | 577 | * take care of this). |
| mimil | 0:308f83189a3f | 578 | * -> near fit or excact fit: do not split, no mem2 creation |
| mimil | 0:308f83189a3f | 579 | * also can't move mem->next directly behind mem, since mem->next |
| mimil | 0:308f83189a3f | 580 | * will always be used at this point! |
| mimil | 0:308f83189a3f | 581 | */ |
| mimil | 0:308f83189a3f | 582 | mem->used = 1; |
| mimil | 0:308f83189a3f | 583 | MEM_STATS_INC_USED(used, mem->next - (mem_size_t)((u8_t *)mem - ram)); |
| mimil | 0:308f83189a3f | 584 | } |
| mimil | 0:308f83189a3f | 585 | |
| mimil | 0:308f83189a3f | 586 | if (mem == lfree) { |
| mimil | 0:308f83189a3f | 587 | /* Find next free block after mem and update lowest free pointer */ |
| mimil | 0:308f83189a3f | 588 | while (lfree->used && lfree != ram_end) { |
| mimil | 0:308f83189a3f | 589 | LWIP_MEM_ALLOC_UNPROTECT(); |
| mimil | 0:308f83189a3f | 590 | /* prevent high interrupt latency... */ |
| mimil | 0:308f83189a3f | 591 | LWIP_MEM_ALLOC_PROTECT(); |
| mimil | 0:308f83189a3f | 592 | lfree = (struct mem *)(void *)&ram[lfree->next]; |
| mimil | 0:308f83189a3f | 593 | } |
| mimil | 0:308f83189a3f | 594 | LWIP_ASSERT("mem_malloc: !lfree->used", ((lfree == ram_end) || (!lfree->used))); |
| mimil | 0:308f83189a3f | 595 | } |
| mimil | 0:308f83189a3f | 596 | LWIP_MEM_ALLOC_UNPROTECT(); |
| mimil | 0:308f83189a3f | 597 | sys_mutex_unlock(&mem_mutex); |
| mimil | 0:308f83189a3f | 598 | LWIP_ASSERT("mem_malloc: allocated memory not above ram_end.", |
| mimil | 0:308f83189a3f | 599 | (mem_ptr_t)mem + SIZEOF_STRUCT_MEM + size <= (mem_ptr_t)ram_end); |
| mimil | 0:308f83189a3f | 600 | LWIP_ASSERT("mem_malloc: allocated memory properly aligned.", |
| mimil | 0:308f83189a3f | 601 | ((mem_ptr_t)mem + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT == 0); |
| mimil | 0:308f83189a3f | 602 | LWIP_ASSERT("mem_malloc: sanity check alignment", |
| mimil | 0:308f83189a3f | 603 | (((mem_ptr_t)mem) & (MEM_ALIGNMENT-1)) == 0); |
| mimil | 0:308f83189a3f | 604 | |
| mimil | 0:308f83189a3f | 605 | return (u8_t *)mem + SIZEOF_STRUCT_MEM; |
| mimil | 0:308f83189a3f | 606 | } |
| mimil | 0:308f83189a3f | 607 | } |
| mimil | 0:308f83189a3f | 608 | #if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT |
| mimil | 0:308f83189a3f | 609 | /* if we got interrupted by a mem_free, try again */ |
| mimil | 0:308f83189a3f | 610 | } while(local_mem_free_count != 0); |
| mimil | 0:308f83189a3f | 611 | #endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */ |
| mimil | 0:308f83189a3f | 612 | LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("mem_malloc: could not allocate %"S16_F" bytes\n", (s16_t)size)); |
| mimil | 0:308f83189a3f | 613 | MEM_STATS_INC(err); |
| mimil | 0:308f83189a3f | 614 | LWIP_MEM_ALLOC_UNPROTECT(); |
| mimil | 0:308f83189a3f | 615 | sys_mutex_unlock(&mem_mutex); |
| mimil | 0:308f83189a3f | 616 | return NULL; |
| mimil | 0:308f83189a3f | 617 | } |
| mimil | 0:308f83189a3f | 618 | |
| mimil | 0:308f83189a3f | 619 | #endif /* MEM_USE_POOLS */ |
| mimil | 0:308f83189a3f | 620 | /** |
| mimil | 0:308f83189a3f | 621 | * Contiguously allocates enough space for count objects that are size bytes |
| mimil | 0:308f83189a3f | 622 | * of memory each and returns a pointer to the allocated memory. |
| mimil | 0:308f83189a3f | 623 | * |
| mimil | 0:308f83189a3f | 624 | * The allocated memory is filled with bytes of value zero. |
| mimil | 0:308f83189a3f | 625 | * |
| mimil | 0:308f83189a3f | 626 | * @param count number of objects to allocate |
| mimil | 0:308f83189a3f | 627 | * @param size size of the objects to allocate |
| mimil | 0:308f83189a3f | 628 | * @return pointer to allocated memory / NULL pointer if there is an error |
| mimil | 0:308f83189a3f | 629 | */ |
| mimil | 0:308f83189a3f | 630 | void *mem_calloc(mem_size_t count, mem_size_t size) |
| mimil | 0:308f83189a3f | 631 | { |
| mimil | 0:308f83189a3f | 632 | void *p; |
| mimil | 0:308f83189a3f | 633 | |
| mimil | 0:308f83189a3f | 634 | /* allocate 'count' objects of size 'size' */ |
| mimil | 0:308f83189a3f | 635 | p = mem_malloc(count * size); |
| mimil | 0:308f83189a3f | 636 | if (p) { |
| mimil | 0:308f83189a3f | 637 | /* zero the memory */ |
| mimil | 0:308f83189a3f | 638 | memset(p, 0, count * size); |
| mimil | 0:308f83189a3f | 639 | } |
| mimil | 0:308f83189a3f | 640 | return p; |
| mimil | 0:308f83189a3f | 641 | } |
| mimil | 0:308f83189a3f | 642 | |
| mimil | 0:308f83189a3f | 643 | #endif /* !MEM_LIBC_MALLOC */ |