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memp.h
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1 /**
2  * @file
3  * Memory pool API
4  */
5 
6 /*
7  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without modification,
11  * are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright notice,
14  * this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  * 3. The name of the author may not be used to endorse or promote products
19  * derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30  * OF SUCH DAMAGE.
31  *
32  * This file is part of the lwIP TCP/IP stack.
33  *
34  * Author: Adam Dunkels <adam@sics.se>
35  *
36  */
37 
38 #ifndef LWIP_HDR_MEMP_H
39 #define LWIP_HDR_MEMP_H
40 
41 #include "lwip/opt.h"
42 
43 #ifdef __cplusplus
44 extern "C" {
45 #endif
46 
47 /* run once with empty definition to handle all custom includes in lwippools.h */
48 #define LWIP_MEMPOOL(name,num,size,desc)
49 #include "lwip/priv/memp_std.h"
50 
51 /** Create the list of all memory pools managed by memp. MEMP_MAX represents a NULL pool at the end */
52 typedef enum {
53 #define LWIP_MEMPOOL(name,num,size,desc) MEMP_##name,
54 #include "lwip/priv/memp_std.h"
55  MEMP_MAX
56 } memp_t;
57 
58 #include "lwip/priv/memp_priv.h"
59 #include "lwip/stats.h"
60 
61 extern const struct memp_desc* const memp_pools[MEMP_MAX];
62 
63 /**
64  * @ingroup mempool
65  * Declare prototype for private memory pool if it is used in multiple files
66  */
67 #define LWIP_MEMPOOL_PROTOTYPE(name) extern const struct memp_desc memp_ ## name
68 
69 #if MEMP_MEM_MALLOC
70 
71 #define LWIP_MEMPOOL_DECLARE(name,num,size,desc) \
72  LWIP_MEMPOOL_DECLARE_STATS_INSTANCE(memp_stats_ ## name) \
73  const struct memp_desc memp_ ## name = { \
74  DECLARE_LWIP_MEMPOOL_DESC(desc) \
75  LWIP_MEMPOOL_DECLARE_STATS_REFERENCE(memp_stats_ ## name) \
76  LWIP_MEM_ALIGN_SIZE(size) \
77  };
78 
79 #else /* MEMP_MEM_MALLOC */
80 
81 /**
82  * @ingroup mempool
83  * Declare a private memory pool
84  * Private mempools example:
85  * .h: only when pool is used in multiple .c files: LWIP_MEMPOOL_PROTOTYPE(my_private_pool);
86  * .c:
87  * - in global variables section: LWIP_MEMPOOL_DECLARE(my_private_pool, 10, sizeof(foo), "Some description")
88  * - call ONCE before using pool (e.g. in some init() function): LWIP_MEMPOOL_INIT(my_private_pool);
89  * - allocate: void* my_new_mem = LWIP_MEMPOOL_ALLOC(my_private_pool);
90  * - free: LWIP_MEMPOOL_FREE(my_private_pool, my_new_mem);
91  *
92  * To relocate a pool, declare it as extern in cc.h. Example for GCC:
93  * extern u8_t \_\_attribute\_\_((section(".onchip_mem"))) memp_memory_my_private_pool_base[];
94  */
95 #define LWIP_MEMPOOL_DECLARE(name,num,size,desc) \
96  LWIP_DECLARE_MEMORY_ALIGNED(memp_memory_ ## name ## _base, ((num) * (MEMP_SIZE + MEMP_ALIGN_SIZE(size)))); \
97  \
98  LWIP_MEMPOOL_DECLARE_STATS_INSTANCE(memp_stats_ ## name) \
99  \
100  static struct memp *memp_tab_ ## name; \
101  \
102  const struct memp_desc memp_ ## name = { \
103  DECLARE_LWIP_MEMPOOL_DESC(desc) \
104  LWIP_MEMPOOL_DECLARE_STATS_REFERENCE(memp_stats_ ## name) \
105  LWIP_MEM_ALIGN_SIZE(size), \
106  (num), \
107  memp_memory_ ## name ## _base, \
108  &memp_tab_ ## name \
109  };
110 
111 #endif /* MEMP_MEM_MALLOC */
112 
113 /**
114  * @ingroup mempool
115  * Initialize a private memory pool
116  */
117 #define LWIP_MEMPOOL_INIT(name) memp_init_pool(&memp_ ## name)
118 /**
119  * @ingroup mempool
120  * Allocate from a private memory pool
121  */
122 #define LWIP_MEMPOOL_ALLOC(name) memp_malloc_pool(&memp_ ## name)
123 /**
124  * @ingroup mempool
125  * Free element from a private memory pool
126  */
127 #define LWIP_MEMPOOL_FREE(name, x) memp_free_pool(&memp_ ## name, (x))
128 
129 #if MEM_USE_POOLS
130 /** This structure is used to save the pool one element came from.
131  * This has to be defined here as it is required for pool size calculation. */
132 struct memp_malloc_helper
133 {
134  memp_t poolnr;
135 #if MEMP_OVERFLOW_CHECK || (LWIP_STATS && MEM_STATS)
136  u16_t size;
137 #endif /* MEMP_OVERFLOW_CHECK || (LWIP_STATS && MEM_STATS) */
138 };
139 #endif /* MEM_USE_POOLS */
140 
141 void memp_init(void);
142 
143 #if MEMP_OVERFLOW_CHECK
144 void *memp_malloc_fn(memp_t type, const char* file, const int line);
145 #define memp_malloc(t) memp_malloc_fn((t), __FILE__, __LINE__)
146 #else
147 void *memp_malloc(memp_t type);
148 #endif
149 void memp_free(memp_t type, void *mem);
150 
151 #ifdef __cplusplus
152 }
153 #endif
154 
155 #endif /* LWIP_HDR_MEMP_H */
memp_t
Create the list of all memory pools managed by memp.
Definition: memp.h:52
lwIP Options Configuration
Statistics API (to be used from TCPIP thread)
lwIP internal memory pools (do not use in application code) This file is deliberately included multip...
memory pools lwIP internal implementations (do not use in application code)
Memory pool descriptor.
Definition: memp_priv.h:108
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