source: SVN/cambria/redboot/packages/services/memalloc/common/current/include/dlmalloc.hxx @ 1

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1#ifndef CYGONCE_MEMALLOC_DLMALLOC_HXX
2#define CYGONCE_MEMALLOC_DLMALLOC_HXX
3
4//==========================================================================
5//
6//      dlmalloc.hxx
7//
8//      Interface to the port of Doug Lea's malloc implementation
9//
10//==========================================================================
11//####ECOSGPLCOPYRIGHTBEGIN####
12// -------------------------------------------
13// This file is part of eCos, the Embedded Configurable Operating System.
14// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
15//
16// eCos is free software; you can redistribute it and/or modify it under
17// the terms of the GNU General Public License as published by the Free
18// Software Foundation; either version 2 or (at your option) any later version.
19//
20// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
21// WARRANTY; without even the implied warranty of MERCHANTABILITY or
22// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
23// for more details.
24//
25// You should have received a copy of the GNU General Public License along
26// with eCos; if not, write to the Free Software Foundation, Inc.,
27// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
28//
29// As a special exception, if other files instantiate templates or use macros
30// or inline functions from this file, or you compile this file and link it
31// with other works to produce a work based on this file, this file does not
32// by itself cause the resulting work to be covered by the GNU General Public
33// License. However the source code for this file must still be made available
34// in accordance with section (3) of the GNU General Public License.
35//
36// This exception does not invalidate any other reasons why a work based on
37// this file might be covered by the GNU General Public License.
38//
39// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
40// at http://sources.redhat.com/ecos/ecos-license/
41// -------------------------------------------
42//####ECOSGPLCOPYRIGHTEND####
43//==========================================================================
44//#####DESCRIPTIONBEGIN####
45//
46// Author(s):    jlarmour
47// Contributors:
48// Date:         2000-06-18
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>
54//             
55//
56//####DESCRIPTIONEND####
57//
58//==========================================================================
59
60// CONFIGURATION
61
62#include <pkgconf/memalloc.h>
63
64#ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
65# include <pkgconf/system.h>
66# ifdef CYGPKG_KERNEL
67#  include <pkgconf/kernel.h>
68# endif
69#endif
70
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
74
75// if the implementation is all that's required, don't output anything else
76#ifndef __MALLOC_IMPL_WANTED
77
78// INCLUDES
79
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
84#endif
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
89#endif
90
91
92// TYPE DEFINITIONS
93
94
95class Cyg_Mempool_dlmalloc
96{
97protected:
98#ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
99    Cyg_Mempolt2<Cyg_Mempool_dlmalloc_Implementation> mypool;
100#else
101    Cyg_Mempool_dlmalloc_Implementation mypool;
102#endif
103
104
105public:
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
108    // same arena.
109    Cyg_Mempool_dlmalloc( cyg_uint8 *base, cyg_int32 size, 
110                          CYG_ADDRWORD argthru=0 )
111        : mypool( base, size, argthru ) {}
112
113    // Destructor
114    ~Cyg_Mempool_dlmalloc() {}
115
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
119    cyg_uint8 *
120    alloc( cyg_int32 size ) { return mypool.alloc( size ); }
121   
122# ifdef CYGFUN_KERNEL_THREADS_TIMER
123    // get some memory with a timeout
124    cyg_uint8 *
125    alloc( cyg_int32 size, cyg_tick_count delay_timeout ) {
126        return mypool.alloc( size, delay_timeout );
127    }
128# endif
129#endif
130
131    // get some memory, return NULL if none available
132    cyg_uint8 *
133    try_alloc( cyg_int32 size ) { return mypool.try_alloc( size ); }
134
135   
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
146    cyg_uint8 *
147    resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
148                  cyg_int32 *oldsize ) { 
149        return mypool.resize_alloc( alloc_ptr, newsize, oldsize);
150    }
151
152    // free the memory back to the pool
153    // returns true on success
154    cyg_bool
155    free( cyg_uint8 *ptr, cyg_int32 size=0 ) { return mypool.free(ptr, size); }
156
157    // Get memory pool status
158    // flags is a bitmask of requested fields to fill in. The flags are
159    // defined in common.hxx
160    void
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
163        // 1 later
164        status.waiting = 0;
165        mypool.get_status( flags, status );
166    }
167};
168
169#endif // ifndef __MALLOC_IMPL_WANTED
170
171#endif // ifndef CYGONCE_MEMALLOC_DLMALLOC_HXX
172// EOF dlmalloc.hxx
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