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1 #ifndef CYGONCE_KERNEL_MEMPOLT2_HXX |
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2 #define CYGONCE_KERNEL_MEMPOLT2_HXX |
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3 |
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4 //========================================================================== |
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5 // |
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6 // mempolt2.hxx |
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7 // |
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8 // Mempolt2 (Memory pool template) class declarations |
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9 // |
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10 //========================================================================== |
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11 //####COPYRIGHTBEGIN#### |
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12 // |
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13 // ------------------------------------------- |
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14 // The contents of this file are subject to the Cygnus eCos Public License |
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15 // Version 1.0 (the "License"); you may not use this file except in |
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16 // compliance with the License. You may obtain a copy of the License at |
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17 // http://sourceware.cygnus.com/ecos |
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18 // |
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19 // Software distributed under the License is distributed on an "AS IS" |
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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21 // License for the specific language governing rights and limitations under |
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22 // the License. |
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23 // |
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24 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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25 // September 30, 1998. |
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26 // |
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27 // The Initial Developer of the Original Code is Cygnus. Portions created |
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28 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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29 // ------------------------------------------- |
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30 // |
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31 //####COPYRIGHTEND#### |
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32 //========================================================================== |
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33 //#####DESCRIPTIONBEGIN#### |
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34 // |
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35 // Author(s): hmt |
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36 // Contributors: hmt |
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37 // Date: 1998-02-10 |
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38 // Purpose: Define Mempolt2 class interface |
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39 |
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40 // Description: The class defined here provides the APIs for thread-safe, |
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41 // kernel-savvy memory managers; make a class with the |
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42 // underlying allocator as the template parameter. |
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43 // Usage: #include <cyg/kernel/mempolt2.hxx> |
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44 // |
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45 // |
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46 //####DESCRIPTIONEND#### |
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47 // |
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48 //========================================================================== |
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49 |
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50 #include <cyg/kernel/ktypes.h> |
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51 #include <cyg/infra/cyg_ass.h> // assertion macros |
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52 #include <cyg/kernel/thread.hxx> |
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53 |
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54 template <class T> |
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55 class Cyg_Mempolt2 |
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56 { |
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57 private: |
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58 T pool; // underlying memory manager |
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59 Cyg_ThreadQueue queue; // queue of waiting threads |
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60 |
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61 class Mempolt2WaitInfo { |
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62 private: |
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63 Mempolt2WaitInfo() {} |
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64 public: |
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65 cyg_int32 size; |
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66 cyg_uint8 *addr; |
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67 Mempolt2WaitInfo( cyg_int32 allocsize ) |
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68 { size = allocsize; addr = 0; } |
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69 }; |
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70 |
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71 public: |
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72 |
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73 CYGDBG_DEFINE_CHECK_THIS |
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74 |
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75 Cyg_Mempolt2( |
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76 cyg_uint8 *base, |
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77 cyg_int32 size, |
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78 CYG_ADDRWORD arg_thru ); // Constructor |
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79 ~Cyg_Mempolt2(); // Destructor |
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80 |
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81 // get some memory; wait if none available; return NULL if failed |
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82 // due to interrupt |
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83 cyg_uint8 *alloc( cyg_int32 size ); |
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84 |
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85 #ifdef CYGFUN_KERNEL_THREADS_TIMER |
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86 // get some memory with a timeout; return NULL if failed |
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87 // due to interrupt or timeout |
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88 cyg_uint8 *alloc( cyg_int32 size, cyg_tick_count abs_timeout ); |
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89 #endif |
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90 |
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91 // get some memory, return NULL if none available |
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92 cyg_uint8 *try_alloc( cyg_int32 size ); |
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93 |
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94 // free the memory back to the pool |
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95 cyg_bool free( cyg_uint8 *p, cyg_int32 size ); |
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96 |
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97 // if applicable: return -1 if not fixed size |
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98 cyg_int32 get_blocksize(); |
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99 |
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100 // is anyone waiting for memory? |
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101 cyg_bool waiting() { return ! queue.empty(); } |
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102 |
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103 // these two are obvious and generic |
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104 cyg_int32 get_totalmem(); |
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105 cyg_int32 get_freemem(); |
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106 |
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107 // get information about the construction parameters for external |
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108 // freeing after the destruction of the holding object. |
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109 void get_arena( |
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110 cyg_uint8 * &base, |
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111 cyg_int32 &size, |
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112 CYG_ADDRWORD &arg_thru ); |
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113 |
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114 // Return the size of the memory allocation (previously returned |
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115 // by alloc() or try_alloc() ) at ptr. Returns -1 if not found |
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116 cyg_int32 |
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117 get_allocation_size( cyg_uint8 * /* ptr */ ); |
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118 }; |
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119 |
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120 // ------------------------------------------------------------------------- |
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121 #endif // ifndef CYGONCE_KERNEL_MEMPOLT2_HXX |
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122 // EOF mempolt2.hxx |
