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comparison packages/kernel/current/include/mfiximpl.hxx @ 0:3111d98ba7b3 ecos-v1_1-release

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Initial commit of eCos version 1.1
author jlarmour
date Tue, 11 May 1999 11:16:07 +0000
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children 443894e2e912
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-1:000000000000 0:3111d98ba7b3
1 #ifndef CYGONCE_KERNEL_MFIXIMPL_HXX
2 #define CYGONCE_KERNEL_MFIXIMPL_HXX
3
4 //==========================================================================
5 //
6 // mfiximpl.hxx
7 //
8 // Memory pool with fixed block class declarations
9 //
10 //==========================================================================
11 //####COPYRIGHTBEGIN####
12 //
13 // -------------------------------------------
14 // The contents of this file are subject to the Cygnus eCos Public License
15 // Version 1.0 (the "License"); you may not use this file except in
16 // compliance with the License. You may obtain a copy of the License at
17 // http://sourceware.cygnus.com/ecos
18 //
19 // Software distributed under the License is distributed on an "AS IS"
20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
21 // License for the specific language governing rights and limitations under
22 // the License.
23 //
24 // The Original Code is eCos - Embedded Cygnus Operating System, released
25 // September 30, 1998.
26 //
27 // The Initial Developer of the Original Code is Cygnus. Portions created
28 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved.
29 // -------------------------------------------
30 //
31 //####COPYRIGHTEND####
32 //==========================================================================
33 //#####DESCRIPTIONBEGIN####
34 //
35 // Author(s): hmt
36 // Contributors: hmt
37 // Date: 1998-03-23
38 // Purpose: Define Mfiximpl class interface
39 // Description: Inline class for constructing a fixed block allocator
40 // Usage: #include <cyg/kernel/mfiximpl.hxx>
41 //
42 //
43 //####DESCRIPTIONEND####
44 //
45 //==========================================================================
46
47 #include <cyg/kernel/ktypes.h>
48 #include <cyg/infra/cyg_ass.h> // assertion macros
49 #include <cyg/kernel/thread.hxx>
50
51 class Cyg_Mempool_Fixed_Implementation {
52 private:
53 // these constructors are explicitly disallowed
54 Cyg_Mempool_Fixed_Implementation() {};
55 // Cyg_Mempool_Fixed_Implementation( Cyg_Mempool_Fixed_Implementation &ref )
56 // {};
57 Cyg_Mempool_Fixed_Implementation &
58 operator=( Cyg_Mempool_Fixed_Implementation &ref )
59 { return ref; };
60
61 private:
62 cyg_uint32 *bitmap;
63 cyg_int32 maptop;
64 cyg_uint8 *mempool;
65 cyg_int32 numblocks;
66 cyg_int32 freeblocks;
67 cyg_int32 blocksize;
68 cyg_int32 firstfree;
69 cyg_uint8 *top;
70
71 public:
72 // THIS is the public API of memory pools generally that can have the
73 // kernel oriented thread-safe package layer atop.
74 //
75 // The kernel package is a template whose type parameter is one of
76 // these. That is the reason there are superfluous parameters here and
77 // more genereralization than might be expected in a fixed block
78 // allocator.
79
80 // Constructor: gives the base and size of the arena in which memory is
81 // to be carved out, note that management structures are taken from the
82 // same arena. The alloc_unit may be any other param in general; it
83 // comes through from the outer constructor unchanged.
84 Cyg_Mempool_Fixed_Implementation(
85 cyg_uint8 *base,
86 cyg_int32 size,
87 CYG_ADDRWORD alloc_unit );
88
89 // Destructor
90 ~Cyg_Mempool_Fixed_Implementation();
91
92 // get some memory; size is ignored in a fixed block allocator
93 inline cyg_uint8 *alloc( cyg_int32 size );
94
95 // free the memory back to the pool; size ignored here
96 inline cyg_bool free( cyg_uint8 *p, cyg_int32 size );
97
98 // if applicable: return -1 if not fixed size
99 inline cyg_int32 get_blocksize() { return blocksize; }
100
101 // these two are obvious and generic
102 inline cyg_int32 get_totalmem() { return blocksize * numblocks; }
103 inline cyg_int32 get_freemem() { return blocksize * freeblocks; }
104
105 // get information about the construction parameters for external
106 // freeing after the destruction of the holding object
107 inline void get_arena( cyg_uint8 * &base, cyg_int32 &size, CYG_ADDRWORD &alloc )
108 {
109 base = (cyg_uint8 *)bitmap;
110 size = top - base;
111 alloc = blocksize;
112 }
113
114 };
115
116 // -------------------------------------------------------------------------
117 #endif // ifndef CYGONCE_KERNEL_MFIXIMPL_HXX
118 // EOF mfiximpl.hxx