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annotate packages/kernel/current/include/mqueue.inl @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents 7e0dca248469
children
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1 #ifndef CYGONCE_KERNEL_MQUEUE_INL
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2 #define CYGONCE_KERNEL_MQUEUE_INL
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3 /*========================================================================
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4 //
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5 // mqueue.inl
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6 //
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7 // Message queues implementation
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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 implementation for eCos message
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48 // queues
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49 // Description: This differs from the message boxes also supported
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50 // by eCos primarily because the requirements of message
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51 // queues are driven by POSIX semantics. POSIX semantics are
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52 // more dynamic and therefore heavyweight than Mboxes,
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53 // including prioritization, and variable sized queues and
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54 // message lengths
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55 // Usage: Do not include this file directly - instead
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56 // #include <cyg/kernel/mqueue.hxx>
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57 //
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58 //####DESCRIPTIONEND####
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59 //
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60 //======================================================================
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61 */
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62
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63 /* CONFIGURATION */
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64
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65 #include <pkgconf/system.h>
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66 #include <pkgconf/kernel.h> // Configuration header
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67
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68 /* INCLUDES */
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69
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70 #include <stddef.h> // size_t, NULL
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71 #include <cyg/infra/cyg_type.h> // Types
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72 #include <cyg/kernel/mqueue.hxx> // Header for this file, just in case
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73 #include <cyg/infra/cyg_ass.h> // Assertion support
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74 #include <cyg/infra/cyg_trac.h> // Tracing support
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75 #include <cyg/kernel/sched.hxx> // scheduler
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76 #include <cyg/kernel/sched.inl> // scheduler inlines
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77 #include <cyg/kernel/sema.hxx> // Cyg_Counting_Semaphore
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78
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79 #ifdef CYGPKG_ISOINFRA
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80 # include <string.h> // memcpy
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81 #else
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82 externC void * memcpy( void *, const void *, size_t );
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83 #endif
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84
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85 // NOTE:
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86 // An alternative implementation based on mutexes and condition variables
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87 // rather than semaphores/scheduler locking was considered. But it was
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88 // not thought quite as good because it isn't driver safe. You would
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89 // also have to manage explicitly what counting semaphores do for you
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90 // intrinsically. Also with the mutex approach, the message queue would
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91 // be locked the whole time a new entry was being filled in, or copied out
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92 //
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93 // It also makes the non-blocking case properly non-blocking rather than
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94 // still being able to block while waiting for a mutex protecting
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95 // the message queue internal structures
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96
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97 /* INLINE FUNCTIONS */
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98
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99 #ifndef CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE
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100 # define CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE inline
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101 #endif
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102
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103 //------------------------------------------------------------------------
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104
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105 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE cyg_bool
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106 Cyg_Mqueue::check_this( cyg_assert_class_zeal zeal ) const
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107 {
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108 if (zeal != cyg_none) {
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109 CYG_CHECK_DATA_PTRC(this); // extreme paranoia
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110
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111 #ifdef CYGDBG_USE_ASSERTS
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112 if ( qlen <= 0 || msgsize <= 0 )
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113 return false;
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114 #endif
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115
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116 if ( queuespacesize < sizeof(struct qentry)+1 )
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117 return false;
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118
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119 CYG_CHECK_DATA_PTRC(queuespace);
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120 CYG_CHECK_FUNC_PTRC(free_fn);
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121
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122 // prevent pre-emption through this. Not so bad since
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123 // this is only a diagnostic function
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124 Cyg_Scheduler::lock();
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125
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126 if (NULL != q)
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127 CYG_CHECK_DATA_PTRC(q);
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128 if (NULL != freelist)
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129 CYG_CHECK_DATA_PTRC(freelist);
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130 if (NULL != callback)
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131 CYG_CHECK_FUNC_PTRC(callback);
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132
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133 // check each queue entry
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134 long msgs=0, busymsgs=0;
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135 unsigned int oldprio=0;
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136 struct qentry *qtmp;
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137
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138 if ( NULL != q )
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139 oldprio = q->priority;
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140 for ( qtmp=q; NULL != qtmp; qtmp=qtmp->next ) {
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141 if ( NULL != qtmp->next )
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142 CYG_CHECK_DATA_PTRC( qtmp->next );
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143
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144 // queue should be priority ordered
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145 if ( qtmp->priority > oldprio )
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146 goto fail;
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147 oldprio = qtmp->priority;
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148
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149 #ifdef CYGDBG_USE_ASSERTS
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150 // valid length
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151 if ( !qtmp->busy )
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152 if ( qtmp->buflen > msgsize )
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153 goto fail;
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154 #endif
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155 if ( qtmp->busy )
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156 busymsgs++;
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157 else
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158 msgs++;
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159 } // for
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160
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161 long freemsgs=0;
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162
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163 // check that number of used and unused messages == q length
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164 for ( qtmp=freelist; NULL != qtmp; qtmp=qtmp->next ) {
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165 if ( NULL != qtmp->next )
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166 CYG_CHECK_DATA_PTRC( qtmp->next );
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167 if ( qtmp->busy )
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168 busymsgs++;
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169 else
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170 freemsgs++;
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171 }
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172
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173 #ifdef CYGDBG_USE_ASSERTS
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174 // and sum of all messages should be the total q length
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175 if ( qlen != (msgs+freemsgs+busymsgs) )
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176 goto fail;
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177 #endif
182
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178
115
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179 Cyg_Scheduler::unlock();
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180
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181 }
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182 return true; // object OK
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183 fail:
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184 Cyg_Scheduler::unlock();
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185 return false; // object fubar'd
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186 }
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187
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188 //------------------------------------------------------------------------
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189
191
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190 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE
115
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191 Cyg_Mqueue::Cyg_Mqueue( long maxmsgs, long maxmsgsize,
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192 qalloc_fn_t qalloc, qfree_fn_t qfree, qerr_t *err )
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193 : putsem(maxmsgs), getsem(0)
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194 {
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195 CYG_REPORT_FUNCTION();
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196 CYG_REPORT_FUNCARG5( "maxmsgs=%ld, maxmsgsize=%ld, qalloc=%08x, "
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197 "qfree=%08x, &err=%08x", maxmsgs, maxmsgsize,
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198 qalloc, qfree, err);
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199 CYG_PRECONDITIONC( (maxmsgs > 0) && (maxmsgsize > 0) );
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200 CYG_CHECK_DATA_PTRC( err );
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201 CYG_CHECK_FUNC_PTRC( qalloc );
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202 CYG_CHECK_FUNC_PTRC( qfree );
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203
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204 // mem to allocate for entire queue size. Also wants to be rounded
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205 // up so that the structs are aligned.
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206 const long addralign = sizeof(void *) - 1;
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207 long entrysize = (sizeof(struct qentry) + maxmsgsize + addralign)
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208 & ~addralign;
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209
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210 queuespacesize = entrysize * maxmsgs;
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211 queuespace = qalloc( queuespacesize );
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212
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213 if (NULL == queuespace) {
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214 *err=NOMEM;
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215 CYG_REPORT_RETURN();
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216 return;
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217 }
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218
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219 // link up freelist
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220 long i;
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221 struct qentry *qtmp;
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222 for ( i=0, qtmp=(struct qentry *)queuespace;
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223 i<maxmsgs-1;
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224 i++, qtmp=qtmp->next ) {
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225 qtmp->busy = false;
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226 qtmp->next = (struct qentry *)((char *)qtmp + entrysize);
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227 } // for
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228
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229 freelist = (struct qentry *)queuespace;
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230
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231 // set the last entry in the chain to the start to make the list circular
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232 qtmp->next = NULL;
182
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diff changeset
233 qtmp->busy = false;
115
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234 callback = NULL;
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235 q = NULL;
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236 free_fn = qfree;
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237 #ifdef CYGDBG_USE_ASSERTS
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238 qlen = maxmsgs;
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239 msgsize = maxmsgsize;
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240 #endif
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241
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242 *err = OK;
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243
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244 // object should be valid now
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245 CYG_ASSERT_THISC();
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246
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247 CYG_REPORT_RETURN();
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248 }
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249
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250 //------------------------------------------------------------------------
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251
191
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252 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE
115
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253 Cyg_Mqueue::~Cyg_Mqueue()
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254 {
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255 CYG_REPORT_FUNCTION();
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256
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257 if ( NULL != queuespace ) {
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258 // object should be valid if queuespace was successfully allocated
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259 CYG_ASSERT_THISC();
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260 free_fn( queuespace, queuespacesize );
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261 }
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262
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263 #ifdef CYGDBG_USE_ASSERTS
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264 qlen = msgsize = 0; // deliberately make it fail check_this() if used
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265 #endif
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266
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267 CYG_REPORT_RETURN();
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268 }
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269
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270 //------------------------------------------------------------------------
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271
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272 // put() copies len bytes of *buf into the queue at priority prio
191
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273 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE Cyg_Mqueue::qerr_t
494
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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274 Cyg_Mqueue::put( const char *buf, size_t len, unsigned int prio, bool block
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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275 #ifdef CYGFUN_KERNEL_THREADS_TIMER
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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276 , cyg_tick_count timeout
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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277 #endif
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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278 )
115
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279 {
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280 CYG_REPORT_FUNCTYPE( "err=%d");
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281 CYG_REPORT_FUNCARG4( "buf=%08x, len=%ld, prio=%ud, block=%d",
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282 buf, len, prio, block==true );
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283 CYG_CHECK_DATA_PTRC( buf );
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diff changeset
284 CYG_ASSERT_THISC();
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285 CYG_PRECONDITIONC( len <= (size_t)msgsize );
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286
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diff changeset
287 qerr_t err;
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diff changeset
288 struct qentry *qtmp, *qent;
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289
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diff changeset
290 // wait till a freelist entry is available
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diff changeset
291 if ( true == block ) {
494
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
292 #ifdef CYGFUN_KERNEL_THREADS_TIMER
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
293 if ( timeout != 0) {
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
294 if ( false == putsem.wait(timeout) ) {
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
295 err = TIMEOUT;
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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diff changeset
296 goto exit;
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
297 }
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
298 }
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
299 else
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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diff changeset
300 #endif
115
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diff changeset
301 if ( false == putsem.wait() ) {
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diff changeset
302 err = INTR;
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diff changeset
303 goto exit;
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parents:
diff changeset
304 }
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diff changeset
305 } else {
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diff changeset
306 if ( false == putsem.trywait() ) {
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diff changeset
307 err = WOULDBLOCK;
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diff changeset
308 goto exit;
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diff changeset
309 }
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310 }
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311
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312 // prevent preemption when fiddling with important members
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313 Cyg_Scheduler::lock();
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314
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315 CYG_ASSERT_THISC();
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diff changeset
316
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diff changeset
317 // get a queue entry from the freelist
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318 // don't need to check the freelist - the semaphore tells us there's
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319 // definitely a usable non-busy one there. It's just a question of
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jlarmour
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320 // locating it.
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321
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diff changeset
322 if (!freelist->busy) { // fast-track common case
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diff changeset
323 qent = freelist;
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diff changeset
324 freelist = freelist->next;
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diff changeset
325 } else {
994
7e0dca248469 * include/mqueue.inl (Cyg_Mqueue::get): Fix invalid loop termination
jlarmour
parents: 494
diff changeset
326 for ( qtmp=freelist; qtmp->next->busy; qtmp=qtmp->next )
115
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327 CYG_EMPTY_STATEMENT; // skip through
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diff changeset
328 qent = qtmp->next;
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329 qtmp->next = qent->next;
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diff changeset
330 }
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diff changeset
331
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diff changeset
332 // now put it in place in q
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diff changeset
333
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diff changeset
334 if ( NULL == q ) {
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diff changeset
335 q = qent;
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336 q->next = NULL;
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diff changeset
337 } else {
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diff changeset
338 struct qentry **qentp;
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diff changeset
339
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diff changeset
340 // insert into queue according to prio
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341 for ( qentp=&q; NULL != *qentp; qentp = &((*qentp)->next) ) {
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diff changeset
342 if ((*qentp)->priority < prio)
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343 break;
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jlarmour
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diff changeset
344 } // for
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diff changeset
345
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diff changeset
346 qent->next = *qentp;
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diff changeset
347 *qentp = qent;
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jlarmour
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diff changeset
348 } // else
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diff changeset
349
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diff changeset
350 qent->priority = prio; // have to set this now so when the sched is
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diff changeset
351 // unlocked, other qent's can be added in the
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jlarmour
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diff changeset
352 // right place
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diff changeset
353 qent->busy = true; // let things know this entry should be ignored until
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diff changeset
354 // it's finished having its data copied
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diff changeset
355
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jlarmour
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diff changeset
356 // unlock the scheduler, and potentially switch threads, but
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diff changeset
357 // that's okay now. We don't want it locked for the expensive memcpy
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diff changeset
358 Cyg_Scheduler::unlock();
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diff changeset
359
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diff changeset
360 qent->buflen = len;
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jlarmour
parents:
diff changeset
361 memcpy( qent->buf(), buf, len );
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jlarmour
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diff changeset
362
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jlarmour
parents:
diff changeset
363 // make available now - setting non-atomically is alright if you think
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
364 // about it - the only thing that matters is that it's completed before
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jlarmour
parents:
diff changeset
365 // the post()
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diff changeset
366 qent->busy = false;
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diff changeset
367
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jlarmour
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diff changeset
368 // if we have to notify someone, we only do it if no-one's already
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jlarmour
parents:
diff changeset
369 // sitting waiting for a message to appear, AND if it's a transition
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jlarmour
parents:
diff changeset
370 // from empty to non-empty
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jlarmour
parents:
diff changeset
371
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jlarmour
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diff changeset
372 if ( callback != NULL && !getsem.waiting() && (0 == getsem.peek()) ) {
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jlarmour
parents:
diff changeset
373 getsem.post();
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jlarmour
parents:
diff changeset
374 callback( *this, callback_data );
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jlarmour
parents:
diff changeset
375 } else
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jlarmour
parents:
diff changeset
376 getsem.post();
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jlarmour
parents:
diff changeset
377
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diff changeset
378 err = OK;
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diff changeset
379
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
380 exit:
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jlarmour
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diff changeset
381 CYG_ASSERT_THISC();
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jlarmour
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diff changeset
382 CYG_REPORT_RETVAL(err);
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jlarmour
parents:
diff changeset
383 return err;
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jlarmour
parents:
diff changeset
384 } // Cyg_Mqueue::put()
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jlarmour
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diff changeset
385
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jlarmour
parents:
diff changeset
386 //------------------------------------------------------------------------
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jlarmour
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diff changeset
387
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
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diff changeset
388
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
389 // get() returns the oldest highest priority message in the queue in *buf
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jlarmour
parents:
diff changeset
390 // and sets *prio to the priority (if prio is non-NULL) and *len to the
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
391 // actual message size
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jlarmour
parents:
diff changeset
392
191
678094f34118 Merge from eCos master repository on 2001-10-19-06:43:02-BST
jlarmour
parents: 182
diff changeset
393 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE Cyg_Mqueue::qerr_t
494
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
394 Cyg_Mqueue::get( char *buf, size_t *len, unsigned int *prio, bool block
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
395 #ifdef CYGFUN_KERNEL_THREADS_TIMER
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
396 , cyg_tick_count timeout
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
397 #endif
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
398 )
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
399 {
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jlarmour
parents:
diff changeset
400 CYG_REPORT_FUNCTYPE( "err=%d");
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jlarmour
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diff changeset
401 CYG_REPORT_FUNCARG4( "buf=%08x, len=%08x, prio=%08x, block=%d",
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
402 buf, len, prio, block==true );
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jlarmour
parents:
diff changeset
403 CYG_CHECK_DATA_PTRC( buf );
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jlarmour
parents:
diff changeset
404 CYG_CHECK_DATA_PTRC( len );
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jlarmour
parents:
diff changeset
405 if ( NULL != prio )
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jlarmour
parents:
diff changeset
406 CYG_CHECK_DATA_PTRC( prio );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
407 CYG_ASSERT_THISC();
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jlarmour
parents:
diff changeset
408
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
409 qerr_t err;
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jlarmour
parents:
diff changeset
410 struct qentry *qent;
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jlarmour
parents:
diff changeset
411
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jlarmour
parents:
diff changeset
412 // wait till a q entry is available
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jlarmour
parents:
diff changeset
413 if ( true == block ) {
494
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
414 #ifdef CYGFUN_KERNEL_THREADS_TIMER
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
415 if ( timeout != 0) {
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
416 if ( false == getsem.wait(timeout) ) {
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
417 err = TIMEOUT;
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
418 goto exit;
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
419 }
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
420 }
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
421 else
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
422 #endif
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
423 if ( false == getsem.wait() ) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
424 err = INTR;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
425 goto exit;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
426 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
427 } else {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
428 if ( false == getsem.trywait() ) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
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429 err = WOULDBLOCK;
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430 goto exit;
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431 }
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432 }
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433
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434 // prevent preemption when fiddling with important members
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435
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436 Cyg_Scheduler::lock();
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437
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438 // don't need to check the q - the semaphore tells us there's
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439 // definitely a usable non-busy one there. It's just a question of
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440 // locating it.
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441
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442 if ( !q->busy ) { // fast-track the common case
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443 qent = q;
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444 q = qent->next;
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445 } else {
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446 struct qentry *qtmp;
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447
994
7e0dca248469 * include/mqueue.inl (Cyg_Mqueue::get): Fix invalid loop termination
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448 for ( qtmp=q; qtmp->next->busy; qtmp=qtmp->next )
115
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449 CYG_EMPTY_STATEMENT; // skip through
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450
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451 qent = qtmp->next;
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452 qtmp->next = qent->next;
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453 } // else
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454
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455 // now stick at front of freelist, but marked busy
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456 qent->next = freelist;
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457 freelist = qent;
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458
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459 qent->busy = true; // don't let it truly be part of the freelist just yet
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460 // till the data is copied out
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461
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462 // unlock the scheduler, and potentially switch threads, but
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463 // that's okay now. We don't want it locked for the expensive memcpy
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464 Cyg_Scheduler::unlock();
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465
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466 *len = qent->buflen;
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467 if ( NULL != prio )
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468 *prio = qent->priority;
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469 memcpy( buf, qent->buf(), *len );
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470
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471 // make available now - setting non-atomically is alright if you think
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472 // about it - the only thing that matters is that it's completed before
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473 // the post()
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474 qent->busy = false;
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475
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476 putsem.post();
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477
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478 err = OK;
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479
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480 exit:
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481 CYG_ASSERT_THISC();
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482 CYG_REPORT_RETVAL(err);
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483 return err;
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484
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485 } // Cyg_Mqueue::get()
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486
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487 //------------------------------------------------------------------------
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488
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489 // count() returns the number of messages in the queue
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490 inline long
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491 Cyg_Mqueue::count()
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492 {
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493 CYG_REPORT_FUNCTYPE("curmsgs=%d");
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494
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495 long curmsgs = (long)getsem.peek();
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496
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497 CYG_REPORT_RETVAL(curmsgs);
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498 return curmsgs;
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499 } // Cyg_Mqueue::count()
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500
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501 //------------------------------------------------------------------------
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502
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503
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504 // Supply a callback function to call (with the supplied data argument)
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505 // when the queue goes from empty to non-empty (unless someone's already
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506 // doing a get()). This returns the old callback_fn, and if olddata is
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507 // non-NULL sets it to the old data (yes, really!)
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508 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE Cyg_Mqueue::callback_fn_t
115
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509 Cyg_Mqueue::setnotify( callback_fn_t callback_fn, CYG_ADDRWORD data,
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510 CYG_ADDRWORD *olddata)
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511 {
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512 CYG_REPORT_FUNCTYPE("old callback=%08x");
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513 CYG_REPORT_FUNCARG3XV( callback_fn, data, olddata );
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514 if ( NULL != callback_fn )
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515 CYG_CHECK_FUNC_PTRC( callback_fn );
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516 if (NULL != olddata)
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517 CYG_CHECK_DATA_PTRC( olddata );
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518
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519 callback_fn_t oldfn;
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520
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521 // Need to prevent preemption for accessing common structures
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522 // Just locking the scheduler has the least overhead
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523 Cyg_Scheduler::lock();
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524
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525 oldfn = callback;
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526 if (NULL != olddata)
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527 *olddata = callback_data;
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528
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529 callback_data = data;
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530 callback = callback_fn;
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531
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532 Cyg_Scheduler::unlock();
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533
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534 CYG_REPORT_RETVAL(oldfn);
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535 return oldfn;
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536 }
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537
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538 //------------------------------------------------------------------------
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539
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540 #endif /* CYGONCE_KERNEL_MQUEUE_INL multiple inclusion protection */
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541
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542 /* EOF mqueue.inl */