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comparison packages/services/memalloc/common/current/src/memfixed.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children e0c0827131d1
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114:5ad2b71d525e 115:6ed91473a1cd
1 //==========================================================================
2 //
3 // memfixed.cxx
4 //
5 // Memory pool with fixed block class declarations
6 //
7 //==========================================================================
8 //####COPYRIGHTBEGIN####
9 //
10 // -------------------------------------------
11 // The contents of this file are subject to the Red Hat eCos Public License
12 // Version 1.1 (the "License"); you may not use this file except in
13 // compliance with the License. You may obtain a copy of the License at
14 // http://www.redhat.com/
15 //
16 // Software distributed under the License is distributed on an "AS IS"
17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
18 // License for the specific language governing rights and limitations under
19 // the License.
20 //
21 // The Original Code is eCos - Embedded Configurable Operating System,
22 // released September 30, 1998.
23 //
24 // The Initial Developer of the Original Code is Red Hat.
25 // Portions created by Red Hat are
26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
27 // All Rights Reserved.
28 // -------------------------------------------
29 //
30 //####COPYRIGHTEND####
31 //==========================================================================
32 //#####DESCRIPTIONBEGIN####
33 //
34 // Author(s): hmt
35 // Contributors: jlarmour
36 // Date: 2000-06-16
37 // Purpose: Define Memfixed class interface
38 // Description: Inline class for constructing a fixed block allocator
39 // Usage: #include <cyg/memalloc/memfixed.hxx>
40 //
41 //
42 //####DESCRIPTIONEND####
43 //
44 //==========================================================================
45
46 // CONFIGURATION
47
48 #include <pkgconf/memalloc.h>
49 #include <pkgconf/system.h>
50 #ifdef CYGPKG_KERNEL
51 # include <pkgconf/kernel.h>
52 #endif
53
54
55 // INCLUDES
56
57 #include <cyg/infra/cyg_type.h> // types
58 #include <cyg/infra/cyg_ass.h> // assertion macros
59 #include <cyg/infra/cyg_trac.h> // tracing macros
60
61 #ifdef CYGFUN_KERNEL_THREADS_TIMER
62 # include <cyg/kernel/ktypes.h> // cyg_tick_count
63 #endif
64
65 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
66 // tell it to optimize for the fixed block one-to-one case
67 # define CYGIMP_MEM_T_ONEFREE_TO_ONEALLOC
68 # include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
69 #endif
70
71 #include <cyg/memalloc/memfixed.hxx>
72 #include <cyg/memalloc/mfiximpl.hxx> // implementation of a fixed mem pool
73 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
74
75 // -------------------------------------------------------------------------
76 // debugging/assert function
77
78 #ifdef CYGDBG_USE_ASSERTS
79 cyg_bool
80 Cyg_Mempool_Fixed::check_this(cyg_assert_class_zeal zeal) const
81 {
82 CYG_REPORT_FUNCTION();
83 // check that we have a non-NULL pointer first
84 if( this == NULL ) return false;
85 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
86 return mypool.check_this( zeal );
87 #else
88 return true;
89 #endif
90 }
91 #endif
92
93 // -------------------------------------------------------------------------
94 // Constructor: gives the base and size of the arena in which memory is
95 // to be carved out, note that management structures are taken from the
96 // same arena. Alloc_unit is the blocksize allocated.
97 Cyg_Mempool_Fixed::Cyg_Mempool_Fixed(
98 cyg_uint8 *base,
99 cyg_int32 size,
100 CYG_ADDRWORD alloc_unit )
101 : mypool( base, size, alloc_unit )
102 {
103 }
104
105 // Destructor
106 Cyg_Mempool_Fixed::~Cyg_Mempool_Fixed()
107 {
108 }
109
110 // -------------------------------------------------------------------------
111 // get some memory; wait if none available
112 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
113 cyg_uint8 *
114 Cyg_Mempool_Fixed::alloc()
115 {
116 return mypool.alloc( 0 );
117 }
118
119 # ifdef CYGFUN_KERNEL_THREADS_TIMER
120 // get some memory with a timeout
121 cyg_uint8 *
122 Cyg_Mempool_Fixed::alloc(cyg_tick_count delay_timeout )
123 {
124 return mypool.alloc( 0, delay_timeout );
125 }
126 # endif
127 #endif
128
129 // get some memory, return NULL if none available
130 cyg_uint8 *
131 Cyg_Mempool_Fixed::try_alloc()
132 {
133 return mypool.try_alloc( 0 );
134 }
135
136 // free the memory back to the pool
137 cyg_bool
138 Cyg_Mempool_Fixed::free( cyg_uint8 *p )
139 {
140 return mypool.free( p, 0 );
141 }
142
143 // supposedly resize existing allocation. This is defined in the
144 // fixed block allocator purely for API consistency. It will return
145 // an error (false) for all values, except for the blocksize
146 // returns true on success
147 cyg_uint8 *
148 Cyg_Mempool_Fixed::resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
149 cyg_int32 *oldsize=NULL )
150 {
151 return mypool.resize_alloc( alloc_ptr, newsize, oldsize );
152 }
153
154 // Get memory pool status
155 void
156 Cyg_Mempool_Fixed::get_status( cyg_mempool_status_flag_t flags,
157 Cyg_Mempool_Status &status )
158 {
159 // set to 0 - if there's anything really waiting, it will be set to
160 // 1 later
161 status.waiting = 0;
162
163 return mypool.get_status( flags, status );
164 }
165
166 // -------------------------------------------------------------------------
167
168 // End of memfixed.cxx