1 #ifndef CYGONCE_MEMALLOC_SEPMETAIMPL_HXX
2 #define CYGONCE_MEMALLOC_SEPMETAIMPL_HXX
4 //==========================================================================
8 // Variable block memory pool with separate metadata class declarations
10 //==========================================================================
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43 //==========================================================================
44 //#####DESCRIPTIONBEGIN####
46 // Author(s): jlarmour
49 // Purpose: Define Sepmetaimpl class interface
50 // Description: Inline class for constructing a variable block allocator
51 // with separate metadata.
52 // Usage: #include <cyg/memalloc/sepmetaimpl.hxx>
55 //####DESCRIPTIONEND####
57 //==========================================================================
60 #include <cyg/infra/cyg_type.h>
61 #include <pkgconf/memalloc.h>
62 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
64 class Cyg_Mempool_Sepmeta_Implementation {
66 // these constructors are explicitly disallowed
67 Cyg_Mempool_Sepmeta_Implementation() {};
68 // Cyg_Mempool_Sepmeta_Implementation( Cyg_Mempool_Sepmeta_Implementation &ref )
70 Cyg_Mempool_Sepmeta_Implementation &
71 operator=( Cyg_Mempool_Sepmeta_Implementation &ref )
75 struct memdq *prev, *next; // prev/next alloced/free block
76 struct memdq *memprev, *memnext; // prev/next block in memory
77 cyg_uint8 *mem; // memory address associated with this block
80 struct memdq allocedhead; // list of alloced memory
81 struct memdq freehead; // list of free memory
82 struct memdq memhead; // initial block on free list
83 struct memdq memend; // dummy memdq indicating the end
84 // of memory, as if it were alloced
85 struct memdq *freemetahead; // unused memdq's
95 // round up addresses according to required alignment of pool
97 alignup( cyg_uint8 *addr );
100 aligndown( cyg_uint8 *addr );
102 // round up addresses according to required alignment of metadata
104 alignmetaup( cyg_uint8 *addr );
107 alignmetadown( cyg_uint8 *addr );
109 // return the alloced dq at mem
111 find_alloced_dq( cyg_uint8 *mem );
113 // returns a free dq of at least size, or NULL if none
115 find_free_dq( cyg_int32 size );
117 // returns the free dq following mem
119 find_free_dq_slot( cyg_uint8 *mem );
122 insert_free_block( struct memdq *freedq );
125 copy_data( cyg_uint8 *dst, cyg_uint8 *src, cyg_int32 nbytes );
128 check_free_memdq( struct memdq *dq );
131 check_alloced_memdq( struct memdq *dq );
134 // THIS is the public API of memory pools generally that can have the
135 // kernel oriented thread-safe package layer atop.
137 struct constructorargs {
141 constructorargs(cyg_int32 align, cyg_uint8 *mbase, cyg_uint32 msize)
143 alignment = align; metabase = mbase; metasize = msize;
147 // Constructor: gives the base and size of the arena in which memory is
149 Cyg_Mempool_Sepmeta_Implementation(
150 cyg_uint8 * /* base */,
151 cyg_int32 /* size */,
152 CYG_ADDRWORD /* constructorargs */ );
155 ~Cyg_Mempool_Sepmeta_Implementation();
157 // get size bytes of memory
159 try_alloc( cyg_int32 /* size */ );
161 // resize existing allocation, if oldsize is non-NULL, previous
162 // allocation size is placed into it. If previous size not available,
163 // it is set to 0. NB previous allocation size may have been rounded up.
164 // Occasionally the allocation can be adjusted *backwards* as well as,
165 // or instead of forwards, therefore the address of the resized
166 // allocation is returned, or NULL if no resizing was possible.
167 // Note that this differs from ::realloc() in that no attempt is
168 // made to call malloc() if resizing is not possible - that is left
169 // to higher layers. The data is copied from old to new though.
170 // The effects of alloc_ptr==NULL or newsize==0 are undefined
172 resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,
173 cyg_int32 * /* oldsize */ );
175 // free size bytes of memory back to the pool
176 // returns true on success
178 free( cyg_uint8 * /* ptr */,
179 cyg_int32 /* size */ );
181 // Get memory pool status
182 // flags is a bitmask of requested fields to fill in. The flags are
183 // defined in common.hxx
185 get_status( cyg_mempool_status_flag_t /* flags */,
186 Cyg_Mempool_Status & /* status */ );
190 #include <cyg/memalloc/sepmetaimpl.inl>
192 // -------------------------------------------------------------------------
193 #endif // ifndef CYGONCE_MEMALLOC_SEPMETAIMPL_HXX
194 // EOF sepmetaimpl.hxx