1 #ifndef CYGONCE_MEMALLOC_SEPMETA_HXX
2 #define CYGONCE_MEMALLOC_SEPMETA_HXX
4 //==========================================================================
8 // Variable block memory pool with separate metadata
10 //==========================================================================
11 //####ECOSGPLCOPYRIGHTBEGIN####
12 // -------------------------------------------
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43 //==========================================================================
44 //#####DESCRIPTIONBEGIN####
46 // Author(s): jlarmour
49 // Purpose: Define Sepmeta class interface
50 // Description: Inline class for constructing a variable block allocator
51 // with separate metadata
52 // Usage: #include <cyg/memalloc/sepmeta.hxx>
55 //####DESCRIPTIONEND####
57 //==========================================================================
61 #include <pkgconf/memalloc.h>
62 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_SEPMETA_THREADAWARE
63 # include <pkgconf/system.h>
65 # include <pkgconf/kernel.h>
70 // when used as an implementation for malloc, we need the following
71 // to let the system know the name of the class
72 #define CYGCLS_MEMALLOC_MALLOC_IMPL Cyg_Mempool_Sepmeta
75 // if the implementation is all that's required, don't output anything else
76 #ifndef __MALLOC_IMPL_WANTED
79 #include <cyg/infra/cyg_type.h> // types
80 #include <cyg/infra/cyg_ass.h> // assertion macros
82 #ifdef CYGFUN_KERNEL_THREADS_TIMER
83 # include <cyg/kernel/ktypes.h> // cyg_tick_count
86 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_SEPMETA_THREADAWARE
87 # include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
90 #include <cyg/memalloc/sepmetaimpl.hxx>// implementation of this mem pool
91 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
96 class Cyg_Mempool_Sepmeta
99 // This is a horrible workaround for the fact that C++ doesn't let
100 // you construct mypool explicitly if you have to initialize a struct
101 // to pass as an argument first.
102 struct Cyg_Mempool_Sepmeta_Implementation::constructorargs args;
104 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_SEPMETA_THREADAWARE
105 Cyg_Mempolt2<Cyg_Mempool_Sepmeta_Implementation> mypool;
107 Cyg_Mempool_Sepmeta_Implementation mypool;
110 // This API makes concrete a class which implements a thread-safe
111 // kernel-savvy memory pool which manages variable size blocks with
112 // separate metadata.
114 // Constructor: gives the base and size of the arena in which memory is
115 // to be carved out, note that management structures are taken from the
117 Cyg_Mempool_Sepmeta( cyg_uint8 * /* base */, cyg_int32 /* size */,
118 cyg_int32 /* alignment */,
119 cyg_uint8 * /* metabase */,
120 cyg_uint32 /* metasize */);
123 ~Cyg_Mempool_Sepmeta();
125 // get some memory; wait if none available
126 // if we aren't configured to be thread-aware this is irrelevant
127 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_SEPMETA_THREADAWARE
129 alloc( cyg_int32 /* size */ );
131 # ifdef CYGFUN_KERNEL_THREADS_TIMER
132 // get some memory with a timeout
134 alloc( cyg_int32 /* size */, cyg_tick_count /* delay_timeout */ );
138 // get some memory, return NULL if none available
140 try_alloc( cyg_int32 /* size */ );
142 // resize existing allocation, if oldsize is non-NULL, previous
143 // allocation size is placed into it. If previous size not available,
144 // it is set to 0. NB previous allocation size may have been rounded up.
145 // Occasionally the allocation can be adjusted *backwards* as well as,
146 // or instead of forwards, therefore the address of the resized
147 // allocation is returned, or NULL if no resizing was possible.
148 // Note that this differs from ::realloc() in that no attempt is
149 // made to call malloc() if resizing is not possible - that is left
150 // to higher layers. The data is copied from old to new though.
151 // The effects of alloc_ptr==NULL or newsize==0 are undefined
153 resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,
154 cyg_int32 * /* oldsize */ =NULL );
156 // free the memory back to the pool
157 // returns true on success
159 free( cyg_uint8 * /* ptr */, cyg_int32 /* size */ =0 );
161 // Get memory pool status
162 // flags is a bitmask of requested fields to fill in. The flags are
163 // defined in common.hxx
165 get_status( cyg_mempool_status_flag_t /* flags */,
166 Cyg_Mempool_Status & /* status */ );
168 CYGDBG_DEFINE_CHECK_THIS
171 #endif // ifndef __MALLOC_IMPL_WANTED
173 #endif // ifndef CYGONCE_MEMALLOC_SEPMETA_HXX