/[dynamips]/upstream/dynamips-0.2.6-RC1/mempool.h
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Annotation of /upstream/dynamips-0.2.6-RC1/mempool.h

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Revision 2 - (hide annotations)
Sat Oct 6 16:03:58 2007 UTC (11 years, 11 months ago) by dpavlin
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import dynamips-0.2.6-RC1

1 dpavlin 1 /*
2     * Copyright (c) 1999-2006 Christophe Fillot.
3     * E-mail: cf@utc.fr
4     *
5     * mempool.h: Simple Memory Pools.
6     */
7    
8     #ifndef __MEMPOOL_H__
9     #define __MEMPOOL_H__ 1
10    
11     #include <sys/types.h>
12     #include <sys/time.h>
13     #include <pthread.h>
14    
15     #include "utils.h"
16    
17     /* Memory Pool "Fixed" Flag */
18     #define MEMPOOL_FIXED 1
19    
20     /* Dummy value used to check if a memory block is invalid */
21     #define MEMBLOCK_TAG 0xdeadbeef
22    
23     typedef struct memblock memblock_t;
24     typedef struct mempool mempool_t;
25    
26     /* Memory block */
27     struct memblock {
28     int tag; /* MEMBLOCK_TAG if block is valid */
29     size_t block_size; /* Block size (without header) */
30     memblock_t *next,*prev; /* Double linked list pointers */
31     mempool_t *pool; /* Pool which contains this block */
32     m_uint64_t data[0]; /* Memory block itself */
33     };
34    
35     /* Memory Pool */
36     struct mempool {
37     memblock_t *block_list; /* Double-linked block list */
38     pthread_mutex_t lock; /* Mutex for managing pool */
39     char *name; /* Name of this pool */
40     int flags; /* Flags */
41     int nr_blocks; /* Number of blocks in this pool */
42     size_t total_size; /* Total bytes allocated */
43     size_t max_size; /* Maximum memory */
44     };
45    
46     /* Lock and unlock access to a memory pool */
47     #define MEMPOOL_LOCK(mp) pthread_mutex_lock(&(mp)->lock)
48     #define MEMPOOL_UNLOCK(mp) pthread_mutex_unlock(&(mp)->lock)
49    
50     /* Callback function for use with mp_foreach */
51     typedef void (*mp_foreach_cbk)(memblock_t *block,void *user_arg);
52    
53     /* Execute an action for each block in specified pool */
54     static inline void mp_foreach(mempool_t *pool,mp_foreach_cbk cbk,void *arg)
55     {
56     memblock_t *mb;
57    
58     for(mb=pool->block_list;mb;mb=mb->next)
59     cbk(mb,arg);
60     }
61    
62     /* Allocate a new block in specified pool */
63     void *mp_alloc(mempool_t *pool,size_t size);
64    
65     /* Allocate a new block which will not be zeroed */
66     void *mp_alloc_n0(mempool_t *pool,size_t size);
67    
68     /* Reallocate a block */
69     void *mp_realloc(void *addr,size_t new_size);
70    
71     /* Allocate a new memory block and copy data into it */
72     void *mp_dup(mempool_t *pool,void *data,size_t size);
73    
74     /* Duplicate specified string and insert it in a memory pool */
75     char *mp_strdup(mempool_t *pool,char *str);
76    
77     /* Free block at specified address */
78     int mp_free(void *addr);
79    
80     /* Free block at specified address and clean pointer */
81     int mp_free_ptr(void *addr);
82    
83     /* Free all blocks of specified pool */
84     void mp_free_all_blocks(mempool_t *pool);
85    
86     /* Free specified memory pool */
87     void mp_free_pool(mempool_t *pool);
88    
89     /* Create a new pool in a fixed memory area */
90     mempool_t *mp_create_fixed_pool(mempool_t *mp,char *name);
91    
92     /* Create a new pool */
93     mempool_t *mp_create_pool(char *name);
94    
95     #endif

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