1 #ifndef CYGONCE_MEMALLOC_DLMALLOC_HXX
2 #define CYGONCE_MEMALLOC_DLMALLOC_HXX
4 //==========================================================================
8 // Interface to the port of Doug Lea's malloc implementation
10 //==========================================================================
11 //####ECOSGPLCOPYRIGHTBEGIN####
12 // -------------------------------------------
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
16 // eCos is free software; you can redistribute it and/or modify it under
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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30 // or inline functions from this file, or you compile this file and link it
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41 // -------------------------------------------
42 //####ECOSGPLCOPYRIGHTEND####
43 //==========================================================================
44 //#####DESCRIPTIONBEGIN####
46 // Author(s): jlarmour
49 // Purpose: Define standard interface to Doug Lea's malloc implementation
50 // Description: Doug Lea's malloc has been ported to eCos. This file provides
51 // the interface between the implementation and the standard
52 // memory allocator interface required by eCos
53 // Usage: #include <cyg/memalloc/dlmalloc.hxx>
56 //####DESCRIPTIONEND####
58 //==========================================================================
62 #include <pkgconf/memalloc.h>
64 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
65 # include <pkgconf/system.h>
67 # include <pkgconf/kernel.h>
71 // when used as an implementation for malloc, we need the following
72 // to let the system know the name of the class
73 #define CYGCLS_MEMALLOC_MALLOC_IMPL Cyg_Mempool_dlmalloc
75 // if the implementation is all that's required, don't output anything else
76 #ifndef __MALLOC_IMPL_WANTED
80 #include <stddef.h> // size_t, ptrdiff_t
81 #include <cyg/infra/cyg_type.h> // types
82 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
83 # include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
85 #include <cyg/memalloc/dlmallocimpl.hxx> // dlmalloc implementation
86 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
87 #ifdef CYGFUN_KERNEL_THREADS_TIMER
88 # include <cyg/kernel/ktypes.h> // cyg_tick_count
95 class Cyg_Mempool_dlmalloc
98 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
99 Cyg_Mempolt2<Cyg_Mempool_dlmalloc_Implementation> mypool;
101 Cyg_Mempool_dlmalloc_Implementation mypool;
106 // Constructor: gives the base and size of the arena in which memory is
107 // to be carved out, note that management structures are taken from the
109 Cyg_Mempool_dlmalloc( cyg_uint8 *base, cyg_int32 size,
110 CYG_ADDRWORD argthru=0 )
111 : mypool( base, size, argthru ) {}
114 //~Cyg_Mempool_dlmalloc() {}
116 // get some memory; wait if none available
117 // if we aren't configured to be thread-aware this is irrelevant
118 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
120 alloc( cyg_int32 size ) { return mypool.alloc( size ); }
122 # ifdef CYGFUN_KERNEL_THREADS_TIMER
123 // get some memory with a timeout
125 alloc( cyg_int32 size, cyg_tick_count delay_timeout ) {
126 return mypool.alloc( size, delay_timeout );
131 // get some memory, return NULL if none available
133 try_alloc( cyg_int32 size ) { return mypool.try_alloc( size ); }
136 // resize existing allocation, if oldsize is non-NULL, previous
137 // allocation size is placed into it. If previous size not available,
138 // it is set to 0. NB previous allocation size may have been rounded up.
139 // Occasionally the allocation can be adjusted *backwards* as well as,
140 // or instead of forwards, therefore the address of the resized
141 // allocation is returned, or NULL if no resizing was possible.
142 // Note that this differs from ::realloc() in that no attempt is
143 // made to call malloc() if resizing is not possible - that is left
144 // to higher layers. The data is copied from old to new though.
145 // The effects of alloc_ptr==NULL or newsize==0 are undefined
147 resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
148 cyg_int32 *oldsize ) {
149 return mypool.resize_alloc( alloc_ptr, newsize, oldsize);
152 // free the memory back to the pool
153 // returns true on success
155 free( cyg_uint8 *ptr, cyg_int32 size=0 ) { return mypool.free(ptr, size); }
157 // Get memory pool status
158 // flags is a bitmask of requested fields to fill in. The flags are
159 // defined in common.hxx
161 get_status( cyg_mempool_status_flag_t flags, Cyg_Mempool_Status &status ) {
162 // set to 0 - if there's anything really waiting, it will be set to
165 mypool.get_status( flags, status );
169 #endif // ifndef __MALLOC_IMPL_WANTED
171 #endif // ifndef CYGONCE_MEMALLOC_DLMALLOC_HXX