1 #ifndef CYGONCE_MEMALLOC_MVARIMPL_HXX
2 #define CYGONCE_MEMALLOC_MVARIMPL_HXX
4 //==========================================================================
8 // Memory pool with variable block class declarations
10 //==========================================================================
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43 //==========================================================================
44 //#####DESCRIPTIONBEGIN####
46 // Author(s): dsm, jlarmour
49 // Purpose: Define Mvarimpl class interface
50 // Description: Inline class for constructing a variable block allocator
51 // Usage: #include <cyg/memalloc/mvarimpl.hxx>
54 //####DESCRIPTIONEND####
56 //==========================================================================
59 #include <cyg/infra/cyg_type.h>
60 #include <pkgconf/memalloc.h>
61 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
63 class Cyg_Mempool_Variable_Implementation {
65 // these constructors are explicitly disallowed
66 Cyg_Mempool_Variable_Implementation() {};
67 // Cyg_Mempool_Variable_Implementation( Cyg_Mempool_Variable_Implementation &ref )
69 Cyg_Mempool_Variable_Implementation &
70 operator=( Cyg_Mempool_Variable_Implementation &ref )
74 struct memdq *prev, *next;
86 // round up size passed to alloc/free to a size that will be used
89 roundup(cyg_int32 size);
92 addr2memdq( cyg_uint8 *addr );
95 alloc2memdq( cyg_uint8 *addr );
98 memdq2alloc( struct memdq *dq );
101 insert_free_block( struct memdq *freedq );
104 // THIS is the public API of memory pools generally that can have the
105 // kernel oriented thread-safe package layer atop.
107 // Constructor: gives the base and size of the arena in which memory is
109 Cyg_Mempool_Variable_Implementation(
110 cyg_uint8 * /* base */,
111 cyg_int32 /* size */,
112 CYG_ADDRWORD /* alignment */ = 8 );
115 ~Cyg_Mempool_Variable_Implementation();
117 // get size bytes of memory
119 try_alloc( cyg_int32 /* size */ );
121 // resize existing allocation, if oldsize is non-NULL, previous
122 // allocation size is placed into it. If previous size not available,
123 // it is set to 0. NB previous allocation size may have been rounded up.
124 // Occasionally the allocation can be adjusted *backwards* as well as,
125 // or instead of forwards, therefore the address of the resized
126 // allocation is returned, or NULL if no resizing was possible.
127 // Note that this differs from ::realloc() in that no attempt is
128 // made to call malloc() if resizing is not possible - that is left
129 // to higher layers. The data is copied from old to new though.
130 // The effects of alloc_ptr==NULL or newsize==0 are undefined
132 resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
133 cyg_int32 *oldsize );
135 // free size bytes of memory back to the pool
136 // returns true on success
138 free( cyg_uint8 * /* ptr */,
139 cyg_int32 /* size */ );
141 // Get memory pool status
142 // flags is a bitmask of requested fields to fill in. The flags are
143 // defined in common.hxx
145 get_status( cyg_mempool_status_flag_t /* flags */,
146 Cyg_Mempool_Status & /* status */ );
150 #include <cyg/memalloc/mvarimpl.inl>
152 // -------------------------------------------------------------------------
153 #endif // ifndef CYGONCE_MEMALLOC_MVARIMPL_HXX