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annotate packages/kernel/current/include/mbox.hxx @ 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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1 #ifndef CYGONCE_KERNEL_MBOX_HXX
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2 #define CYGONCE_KERNEL_MBOX_HXX
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3
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4 //==========================================================================
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5 //
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6 // mbox.hxx
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7 //
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8 // Plain (void *) Mbox (Message Box/Mailbox) 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 Red Hat eCos Public License
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15 // Version 1.1 (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://www.redhat.com/
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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 Configurable Operating System,
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25 // released September 30, 1998.
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26 //
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27 // The Initial Developer of the Original Code is Red Hat.
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28 // Portions created by Red Hat are
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29 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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30 // All Rights Reserved.
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31 // -------------------------------------------
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32 //
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33 //####COPYRIGHTEND####
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34 //==========================================================================
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35 //#####DESCRIPTIONBEGIN####
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36 //
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37 // Author(s): hmt
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38 // Contributors: hmt
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39 // Date: 1998-02-10
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40 // Purpose: Define Mbox class interfaces
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41 // Description: The classes defined here provide the APIs for mboxes.
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42 // Usage: #include <cyg/kernel/mbox.hxx>
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43 //
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44 //
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45 //####DESCRIPTIONEND####
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46 //
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47 //==========================================================================
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48
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49 #include <cyg/kernel/ktypes.h>
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50 #include <cyg/infra/cyg_ass.h> // assertion macros
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51 #include <cyg/kernel/thread.hxx>
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52
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53 #ifdef CYGIMP_MBOX_USE_MBOXT_PLAIN
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54 #include <cyg/kernel/mboxt.hxx>
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55 #else
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56 #include <cyg/kernel/mboxt2.hxx>
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57 #endif
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58
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59 // -------------------------------------------------------------------------
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60 // Message/Mail Box. This class implements a queue of void * items using
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61 // the Cyg_Mbox<Type, QSize> template class.
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62
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63 #ifndef CYGNUM_KERNEL_SYNCH_MBOX_QUEUE_SIZE
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64 // default is 10 elements
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65 #define CYGNUM_KERNEL_SYNCH_MBOX_QUEUE_SIZE (10)
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66 #endif
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67
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68 // Cyg_Mbox has a fixed size array of (void *)s; one size fits all.
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69 // Because of this, we can simplify the API by returning a NULL for
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70 // "failed" conditions. Ergo a NULL message is illegal. BFD.
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71
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72 class Cyg_Mbox
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73 {
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74 private:
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75 #ifdef CYGIMP_MBOX_USE_MBOXT_PLAIN
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76 Cyg_Mboxt<void *, CYGNUM_KERNEL_SYNCH_MBOX_QUEUE_SIZE> m;
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77 #else
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78 Cyg_Mboxt2<void *, CYGNUM_KERNEL_SYNCH_MBOX_QUEUE_SIZE> m;
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79 #endif
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80
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81 public:
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82
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83 CYGDBG_DEFINE_CHECK_THIS
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84
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85 Cyg_Mbox(); // Constructor
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86 ~Cyg_Mbox(); // Destructor
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87
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88 void * get(); // get an item; wait if none
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89 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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90 void * get( cyg_tick_count timeout );
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91 #endif
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92 void * tryget(); // just one attempt
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93
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94 void * peek_item(); // Get next item to be returned
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95 // without removing it
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96
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97 #ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT // then we support it too
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98 cyg_bool put( void *item ); // put an item; wait if full
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99 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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100 cyg_bool put( void *item, cyg_tick_count timeout );
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101 #endif
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102 #endif
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103 cyg_bool tryput( void *item ); // fails if Q full
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104
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105 inline
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106 cyg_count32 peek() // Get current count value
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107 {
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108 return m.peek();
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109 }
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110
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111 inline
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112 cyg_bool waiting_to_get() // Any threads waiting to get?
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113 {
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114 return m.waiting_to_get();
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115 }
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116 inline
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117 cyg_bool waiting_to_put() // Any threads waiting to put?
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118 {
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119 return m.waiting_to_put();
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120 }
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121 };
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122
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123
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124
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125 // -------------------------------------------------------------------------
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126 #endif // ifndef CYGONCE_KERNEL_MBOX_HXX
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127 // End of mbox.hxx