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annotate packages/kernel/current/include/mqueue.hxx @ 3284:4839eca9f0c7

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Increase resolution of time measurement for platforms featuring HAL_CLOCK_READ_NS. [Bugzilla 1001958]
author vae
date Thu, 13 Mar 2014 21:32:49 +0000
parents 74dbf4c3f2e1
children
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1 #ifndef CYGONCE_KERNEL_MQUEUE_HXX
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2 #define CYGONCE_KERNEL_MQUEUE_HXX
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3 /*========================================================================
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4 //
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5 // mqueue.hxx
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6 //
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7 // Message queues
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8 //
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9 //========================================================================
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10 // ####ECOSGPLCOPYRIGHTBEGIN####
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11 // -------------------------------------------
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12 // This file is part of eCos, the Embedded Configurable Operating System.
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13 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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14 //
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15 // eCos is free software; you can redistribute it and/or modify it under
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16 // the terms of the GNU General Public License as published by the Free
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17 // Software Foundation; either version 2 or (at your option) any later
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18 // version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT
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21 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License
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26 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use
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30 // macros or inline functions from this file, or you compile this file
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31 // and link it with other works to produce a work based on this file,
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32 // this file does not by itself cause the resulting work to be covered by
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33 // the GNU General Public License. However the source code for this file
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34 // must still be made available in accordance with section (3) of the GNU
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35 // General Public License v2.
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36 //
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37 // This exception does not invalidate any other reasons why a work based
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38 // on this file might be covered by the GNU General Public License.
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39 // -------------------------------------------
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40 // ####ECOSGPLCOPYRIGHTEND####
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41 //========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): jlarmour
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45 // Contributors:
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46 // Date: 2000-05-09
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47 // Purpose: This file provides the interface for eCos message queues
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48 // Description: This differs from the message boxes also supported by
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49 // eCos primarily because the requirements of message
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50 // queues are driven by POSIX semantics. POSIX semantics are
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51 // more dynamic and therefore heavyweight than Mboxes,
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52 // including prioritization, and variable sized queues and
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53 // message lengths
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54 // Usage: #include <cyg/kernel/mqueue.hxx>
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55 //
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56 //####DESCRIPTIONEND####
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57 //
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58 //======================================================================
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59 */
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60
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61 /* CONFIGURATION */
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62
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63 #include <pkgconf/kernel.h> /* Configuration header */
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64
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65 /* INCLUDES */
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66
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67 #include <stddef.h> /* size_t */
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68 #include <cyg/infra/cyg_type.h> /* Types */
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69 #include <cyg/infra/cyg_ass.h> /* CYGDBG_DEFINE_CHECK_THIS,
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70 CYGDBG_USE_ASSERTS */
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71 #include <cyg/kernel/ktypes.h> /* Kernel package types */
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72 #include <cyg/kernel/sema.hxx> /* Cyg_Counting_Semaphore */
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73
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74 /* CLASSES */
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75
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76 class Cyg_Mqueue {
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77 public:
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78 typedef void (*callback_fn_t)(Cyg_Mqueue &q, CYG_ADDRWORD data);
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79 typedef void * (*qalloc_fn_t)(size_t len);
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80 typedef void (*qfree_fn_t)(void *ptr, size_t len);
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81
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82 typedef enum {
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83 OK=0,
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84 NOMEM,
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85 WOULDBLOCK,
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86 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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87 TIMEOUT,
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88 #endif
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89 INTR
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90 } qerr_t;
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91
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92 protected:
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93 struct qentry {
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94 struct qentry *next;
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95 unsigned int priority;
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96 size_t buflen;
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97 volatile bool busy;
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98 // data buffer follows here
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99 char *buf() const { return (char *)this + sizeof(*this); }
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100 };
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101
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102 Cyg_Counting_Semaphore putsem, getsem;
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103
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104 struct qentry *q; // q entries in use
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105 struct qentry *freelist; // q entries not in use
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106 void *queuespace; // placeholder for the dynamically allocated
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107 // area
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108
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109 size_t queuespacesize;
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110
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111 qfree_fn_t free_fn; // how to free queuespace when we destruct
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112
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113 callback_fn_t callback;
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114 CYG_ADDRWORD callback_data;
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115
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116 CYGDBG_DEFINE_CHECK_THIS
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117
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118 #ifdef CYGDBG_USE_ASSERTS
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119 long qlen;
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120 size_t msgsize;
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121 #endif
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122
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123 public:
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124
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125 Cyg_Mqueue( long maxmsgs, long maxmsgsize,
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126 qalloc_fn_t qalloc, qfree_fn_t qfree, qerr_t *err );
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127 ~Cyg_Mqueue();
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128 // put() copies len bytes of *buf into the queue at priority prio
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129 qerr_t put( const char *buf, size_t len, unsigned int prio, bool block=true
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130 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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131 ,cyg_tick_count timeout = 0
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132 #endif
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133 );
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134
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135 // get() returns the oldest highest priority message in the queue in *buf
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136 // and sets *prio to the priority (if prio is non-NULL) and *len to the
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137 // actual message size
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138 qerr_t get( char *buf, size_t *len, unsigned int *prio, bool block=true
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139 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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140 ,cyg_tick_count timeout = 0
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141 #endif
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142 );
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143
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144 // count() returns the number of messages in the queue
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145 long count();
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146
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147 // Supply a callback function to call (with the supplied data argument)
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148 // when the queue goes from empty to non-empty (unless someone's already
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149 // doing a get()). This returns the old callback_fn, and if olddata is
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150 // non-NULL sets it to the old data (yes, really!)
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151 callback_fn_t setnotify( callback_fn_t callback_fn, CYG_ADDRWORD data,
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152 CYG_ADDRWORD *olddata=NULL);
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153
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154 }; /* class Cyg_Mqueue */
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155
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156 #ifndef CYGIMP_KERNEL_SYNCH_MQUEUE_NOT_INLINE
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157 # include <cyg/kernel/mqueue.inl>
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158 #endif
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159
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160 #endif /* CYGONCE_KERNEL_MQUEUE_HXX multiple inclusion protection */
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161
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162 /* EOF mqueue.hxx */