annotate packages/kernel/current/include/mboxt.hxx @ 3403:8c8767bb9a62 default tip

devs/nand/micron_mt29: Remove defunct references (in comments) to mt29f2g08_oob_ecc.
author Ross Younger <wry@ecoscentric.com>
date Sun, 18 Jan 2015 17:59:01 +1300
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1 #ifndef CYGONCE_KERNEL_MBOXT_HXX
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2 #define CYGONCE_KERNEL_MBOXT_HXX
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3
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4 //==========================================================================
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5 //
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6 // mboxt.hxx
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7 //
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8 // Mboxt (Message Box/Mailbox) class declarations
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9 //
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10 //==========================================================================
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11 // ####ECOSGPLCOPYRIGHTBEGIN####
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12 // -------------------------------------------
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13 // This file is part of eCos, the Embedded Configurable Operating System.
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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15 //
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16 // eCos is free software; you can redistribute it and/or modify it under
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17 // the terms of the GNU General Public License as published by the Free
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18 // Software Foundation; either version 2 or (at your option) any later
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19 // version.
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20 //
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21 // eCos is distributed in the hope that it will be useful, but WITHOUT
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22 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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23 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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24 // for more details.
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25 //
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26 // You should have received a copy of the GNU General Public License
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27 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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28 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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29 //
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30 // As a special exception, if other files instantiate templates or use
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31 // macros or inline functions from this file, or you compile this file
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32 // and link it with other works to produce a work based on this file,
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33 // this file does not by itself cause the resulting work to be covered by
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34 // the GNU General Public License. However the source code for this file
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35 // must still be made available in accordance with section (3) of the GNU
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36 // General Public License v2.
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37 //
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38 // This exception does not invalidate any other reasons why a work based
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39 // on this file might be covered by the GNU General Public License.
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40 // -------------------------------------------
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41 // ####ECOSGPLCOPYRIGHTEND####
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42 //==========================================================================
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43 //#####DESCRIPTIONBEGIN####
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44 //
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45 // Author(s): hmt
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46 // Contributors: hmt
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47 // Date: 1998-02-10
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48 // Purpose: Define Mboxt class interfaces
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49 // Description: The classes defined here provide the APIs for mboxtes.
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50 // Usage: #include <cyg/kernel/mboxt.hxx>
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51 // #include <cyg/kernel/mboxt.inl>
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52 //
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53 //
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54 //####DESCRIPTIONEND####
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55 //
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56 //==========================================================================
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57
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58 #include <cyg/kernel/ktypes.h>
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59 #include <cyg/infra/cyg_ass.h> // assertion macros
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60 #include <cyg/kernel/thread.hxx>
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61
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62 // -------------------------------------------------------------------------
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63 // Message/Mail Box. This template implements a queue of T's.
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64 // Implemented as a template for maximal flexibility; one would hope
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65 // that only one, with T==(void *) and the same number of them,
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66 // is ever used without very good reason.
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67
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68 // Cyg_Mboxt has a fixed size array of T's; one size fits all.
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69
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70 template <class T, cyg_count32 QUEUE_SIZE>
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71 class Cyg_Mboxt
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72 {
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73 private:
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74 cyg_count32 base; // index of first used slot
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75 cyg_count32 count; // count of used slots
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76 Cyg_ThreadQueue get_threadq; // Queue of waiting threads
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77 #ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
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78 Cyg_ThreadQueue put_threadq; // Queue of waiting threads
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79 #endif
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80 static const
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81 cyg_count32 size = QUEUE_SIZE;
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82 T itemqueue[ QUEUE_SIZE ];
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83 // queue of items
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84 // private utility functions
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85 // wake up a thread from some queue
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86 inline void wakeup_waiter( Cyg_ThreadQueue &q );
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87
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88 public:
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89
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90 CYGDBG_DEFINE_CHECK_THIS
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91
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92 Cyg_Mboxt(); // Constructor
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93 ~Cyg_Mboxt(); // Destructor
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94
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95 cyg_bool get( T &ritem ); // get an item; wait if none
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96 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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97 cyg_bool get( T &ritem, cyg_tick_count abs_timeout );
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98 #endif
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99 cyg_bool tryget( T &ritem ); // just one attempt
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100
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101 cyg_bool peek_item( T &ritem ); // get next item without
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102 // removing it
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103
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104 #ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
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105 cyg_bool put( const T item ); // put an item; wait if full
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106 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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107 cyg_bool put( const T item, cyg_tick_count abs_timeout );
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108 #endif
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109 #endif
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110 cyg_bool tryput( const T item ); // fails if Q full
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111
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112 inline
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113 cyg_count32 peek() // Get current count value
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114 {
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115 return count;
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116 }
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117
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118 inline
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119 cyg_bool waiting_to_get() // Any threads waiting?
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120 {
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121 return ! get_threadq.empty();
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122 }
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123
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124 inline
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125 cyg_bool waiting_to_put() // Any threads waiting?
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126 {
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127 #ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
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128 return ! put_threadq.empty();
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129 #else
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130 return false;
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131 #endif
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132 }
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133 };
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134
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135 // -------------------------------------------------------------------------
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136 #endif // ifndef CYGONCE_KERNEL_MBOXT_HXX
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137 // EOF mboxt.hxx