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annotate packages/kernel/current/include/mqueue.inl @ 494:cffb2601409c

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* include/mqueue.hxx: Allow get/put to return time out. * include mqueue.inl: Ditto.
author jlarmour
date Mon, 13 Jan 2003 05:50:23 +0000
parents d2c90368aeef
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 //========================================================================
208
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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 Red Hat, 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 version.
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18 //
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19 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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20 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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21 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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22 // for more details.
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23 //
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24 // You should have received a copy of the GNU General Public License along
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25 // with eCos; if not, write to the Free Software Foundation, Inc.,
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26 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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27 //
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28 // As a special exception, if other files instantiate templates or use macros
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29 // or inline functions from this file, or you compile this file and link it
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30 // with other works to produce a work based on this file, this file does not
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31 // by itself cause the resulting work to be covered by the GNU General Public
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32 // License. However the source code for this file must still be made available
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33 // in accordance with section (3) of the GNU General Public License.
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34 //
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35 // This exception does not invalidate any other reasons why a work based on
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36 // this file might be covered by the GNU General Public License.
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37 //
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38 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
210
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39 // at http://sources.redhat.com/ecos/ecos-license/
208
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40 // -------------------------------------------
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41 //####ECOSGPLCOPYRIGHTEND####
115
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42 //========================================================================
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43 //#####DESCRIPTIONBEGIN####
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44 //
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45 // Author(s): jlarmour
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46 // Contributors:
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47 // Date: 2000-05-09
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48 // Purpose: This file provides the implementation for eCos message
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49 // queues
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50 // Description: This differs from the message boxes also supported
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51 // by eCos primarily because the requirements of message
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52 // queues are driven by POSIX semantics. POSIX semantics are
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53 // more dynamic and therefore heavyweight than Mboxes,
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54 // including prioritization, and variable sized queues and
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55 // message lengths
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56 // Usage: Do not include this file directly - instead
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57 // #include <cyg/kernel/mqueue.hxx>
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58 //
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59 //####DESCRIPTIONEND####
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60 //
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61 //======================================================================
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62 */
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63
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64 /* CONFIGURATION */
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65
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66 #include <pkgconf/system.h>
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67 #include <pkgconf/kernel.h> // Configuration header
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68
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69 /* INCLUDES */
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70
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71 #include <stddef.h> // size_t, NULL
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72 #include <cyg/infra/cyg_type.h> // Types
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73 #include <cyg/kernel/mqueue.hxx> // Header for this file, just in case
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74 #include <cyg/infra/cyg_ass.h> // Assertion support
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75 #include <cyg/infra/cyg_trac.h> // Tracing support
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76 #include <cyg/kernel/sched.hxx> // scheduler
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77 #include <cyg/kernel/sched.inl> // scheduler inlines
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78 #include <cyg/kernel/sema.hxx> // Cyg_Counting_Semaphore
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79
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80 #ifdef CYGPKG_ISOINFRA
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81 # include <string.h> // memcpy
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82 #else
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83 externC void * memcpy( void *, const void *, size_t );
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84 #endif
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85
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86 // NOTE:
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87 // An alternative implementation based on mutexes and condition variables
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88 // rather than semaphores/scheduler locking was considered. But it was
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89 // not thought quite as good because it isn't driver safe. You would
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90 // also have to manage explicitly what counting semaphores do for you
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91 // intrinsically. Also with the mutex approach, the message queue would
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92 // be locked the whole time a new entry was being filled in, or copied out
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93 //
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94 // It also makes the non-blocking case properly non-blocking rather than
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95 // still being able to block while waiting for a mutex protecting
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96 // the message queue internal structures
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97
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98 /* INLINE FUNCTIONS */
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99
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100 #ifndef CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE
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101 # define CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE inline
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102 #endif
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103
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104 //------------------------------------------------------------------------
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105
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106 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE cyg_bool
115
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107 Cyg_Mqueue::check_this( cyg_assert_class_zeal zeal ) const
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108 {
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109 if (zeal != cyg_none) {
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110 CYG_CHECK_DATA_PTRC(this); // extreme paranoia
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111
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112 #ifdef CYGDBG_USE_ASSERTS
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113 if ( qlen <= 0 || msgsize <= 0 )
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114 return false;
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115 #endif
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116
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117 if ( queuespacesize < sizeof(struct qentry)+1 )
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118 return false;
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119
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120 CYG_CHECK_DATA_PTRC(queuespace);
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121 CYG_CHECK_FUNC_PTRC(free_fn);
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122
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123 // prevent pre-emption through this. Not so bad since
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124 // this is only a diagnostic function
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125 Cyg_Scheduler::lock();
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126
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127 if (NULL != q)
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128 CYG_CHECK_DATA_PTRC(q);
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129 if (NULL != freelist)
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130 CYG_CHECK_DATA_PTRC(freelist);
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131 if (NULL != callback)
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132 CYG_CHECK_FUNC_PTRC(callback);
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133
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134 // check each queue entry
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135 long msgs=0, busymsgs=0;
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136 unsigned int oldprio=0;
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137 struct qentry *qtmp;
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138
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139 if ( NULL != q )
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140 oldprio = q->priority;
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141 for ( qtmp=q; NULL != qtmp; qtmp=qtmp->next ) {
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142 if ( NULL != qtmp->next )
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143 CYG_CHECK_DATA_PTRC( qtmp->next );
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144
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145 // queue should be priority ordered
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146 if ( qtmp->priority > oldprio )
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147 goto fail;
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148 oldprio = qtmp->priority;
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149
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150 #ifdef CYGDBG_USE_ASSERTS
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151 // valid length
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152 if ( !qtmp->busy )
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153 if ( qtmp->buflen > msgsize )
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154 goto fail;
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155 #endif
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156 if ( qtmp->busy )
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157 busymsgs++;
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158 else
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159 msgs++;
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160 } // for
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161
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162 long freemsgs=0;
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163
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164 // check that number of used and unused messages == q length
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165 for ( qtmp=freelist; NULL != qtmp; qtmp=qtmp->next ) {
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166 if ( NULL != qtmp->next )
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167 CYG_CHECK_DATA_PTRC( qtmp->next );
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168 if ( qtmp->busy )
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169 busymsgs++;
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170 else
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171 freemsgs++;
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172 }
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173
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174 #ifdef CYGDBG_USE_ASSERTS
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175 // and sum of all messages should be the total q length
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176 if ( qlen != (msgs+freemsgs+busymsgs) )
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177 goto fail;
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178 #endif
182
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179
115
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180 Cyg_Scheduler::unlock();
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181
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182 }
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183 return true; // object OK
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184 fail:
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185 Cyg_Scheduler::unlock();
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186 return false; // object fubar'd
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187 }
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188
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189 //------------------------------------------------------------------------
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190
191
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191 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE
115
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192 Cyg_Mqueue::Cyg_Mqueue( long maxmsgs, long maxmsgsize,
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193 qalloc_fn_t qalloc, qfree_fn_t qfree, qerr_t *err )
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194 : putsem(maxmsgs), getsem(0)
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195 {
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196 CYG_REPORT_FUNCTION();
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197 CYG_REPORT_FUNCARG5( "maxmsgs=%ld, maxmsgsize=%ld, qalloc=%08x, "
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198 "qfree=%08x, &err=%08x", maxmsgs, maxmsgsize,
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199 qalloc, qfree, err);
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200 CYG_PRECONDITIONC( (maxmsgs > 0) && (maxmsgsize > 0) );
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201 CYG_CHECK_DATA_PTRC( err );
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202 CYG_CHECK_FUNC_PTRC( qalloc );
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203 CYG_CHECK_FUNC_PTRC( qfree );
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204
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205 // mem to allocate for entire queue size. Also wants to be rounded
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206 // up so that the structs are aligned.
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207 const long addralign = sizeof(void *) - 1;
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208 long entrysize = (sizeof(struct qentry) + maxmsgsize + addralign)
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209 & ~addralign;
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210
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211 queuespacesize = entrysize * maxmsgs;
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212 queuespace = qalloc( queuespacesize );
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213
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214 if (NULL == queuespace) {
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215 *err=NOMEM;
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216 CYG_REPORT_RETURN();
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217 return;
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218 }
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219
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220 // link up freelist
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221 long i;
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222 struct qentry *qtmp;
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223 for ( i=0, qtmp=(struct qentry *)queuespace;
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224 i<maxmsgs-1;
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225 i++, qtmp=qtmp->next ) {
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226 qtmp->busy = false;
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227 qtmp->next = (struct qentry *)((char *)qtmp + entrysize);
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228 } // for
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229
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230 freelist = (struct qentry *)queuespace;
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231
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232 // set the last entry in the chain to the start to make the list circular
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233 qtmp->next = NULL;
182
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234 qtmp->busy = false;
115
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235 callback = NULL;
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236 q = NULL;
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237 free_fn = qfree;
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238 #ifdef CYGDBG_USE_ASSERTS
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239 qlen = maxmsgs;
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240 msgsize = maxmsgsize;
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241 #endif
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242
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243 *err = OK;
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244
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245 // object should be valid now
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246 CYG_ASSERT_THISC();
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247
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248 CYG_REPORT_RETURN();
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249 }
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250
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251 //------------------------------------------------------------------------
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252
191
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253 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE
115
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254 Cyg_Mqueue::~Cyg_Mqueue()
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255 {
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256 CYG_REPORT_FUNCTION();
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257
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258 if ( NULL != queuespace ) {
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259 // object should be valid if queuespace was successfully allocated
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260 CYG_ASSERT_THISC();
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261 free_fn( queuespace, queuespacesize );
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262 }
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263
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264 #ifdef CYGDBG_USE_ASSERTS
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265 qlen = msgsize = 0; // deliberately make it fail check_this() if used
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266 #endif
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267
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268 CYG_REPORT_RETURN();
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269 }
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270
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271 //------------------------------------------------------------------------
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272
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273 // put() copies len bytes of *buf into the queue at priority prio
191
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274 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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275 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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276 #ifdef CYGFUN_KERNEL_THREADS_TIMER
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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277 , cyg_tick_count timeout
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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278 #endif
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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279 )
115
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280 {
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281 CYG_REPORT_FUNCTYPE( "err=%d");
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282 CYG_REPORT_FUNCARG4( "buf=%08x, len=%ld, prio=%ud, block=%d",
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parents:
diff changeset
283 buf, len, prio, block==true );
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diff changeset
284 CYG_CHECK_DATA_PTRC( buf );
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diff changeset
285 CYG_ASSERT_THISC();
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286 CYG_PRECONDITIONC( len <= (size_t)msgsize );
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diff changeset
287
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diff changeset
288 qerr_t err;
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diff changeset
289 struct qentry *qtmp, *qent;
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diff changeset
290
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diff changeset
291 // wait till a freelist entry is available
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diff changeset
292 if ( true == block ) {
494
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diff changeset
293 #ifdef CYGFUN_KERNEL_THREADS_TIMER
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
294 if ( timeout != 0) {
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
295 if ( false == putsem.wait(timeout) ) {
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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diff changeset
296 err = TIMEOUT;
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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diff changeset
297 goto exit;
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 }
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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parents: 210
diff changeset
300 else
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
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diff changeset
301 #endif
115
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diff changeset
302 if ( false == putsem.wait() ) {
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diff changeset
303 err = INTR;
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diff changeset
304 goto exit;
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parents:
diff changeset
305 }
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306 } else {
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diff changeset
307 if ( false == putsem.trywait() ) {
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diff changeset
308 err = WOULDBLOCK;
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diff changeset
309 goto exit;
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diff changeset
310 }
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311 }
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diff changeset
312
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diff changeset
313 // prevent preemption when fiddling with important members
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314 Cyg_Scheduler::lock();
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315
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diff changeset
316 CYG_ASSERT_THISC();
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diff changeset
317
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diff changeset
318 // get a queue entry from the freelist
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319 // don't need to check the freelist - the semaphore tells us there's
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320 // definitely a usable non-busy one there. It's just a question of
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diff changeset
321 // locating it.
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diff changeset
322
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diff changeset
323 if (!freelist->busy) { // fast-track common case
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324 qent = freelist;
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325 freelist = freelist->next;
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diff changeset
326 } else {
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diff changeset
327 for ( qtmp=freelist; !qtmp->next->busy; qtmp=qtmp->next )
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328 CYG_EMPTY_STATEMENT; // skip through
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329 qent = qtmp->next;
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diff changeset
330 qtmp->next = qent->next;
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diff changeset
331 }
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diff changeset
332
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diff changeset
333 // now put it in place in q
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diff changeset
334
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diff changeset
335 if ( NULL == q ) {
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336 q = qent;
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337 q->next = NULL;
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diff changeset
338 } else {
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diff changeset
339 struct qentry **qentp;
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diff changeset
340
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diff changeset
341 // insert into queue according to prio
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diff changeset
342 for ( qentp=&q; NULL != *qentp; qentp = &((*qentp)->next) ) {
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diff changeset
343 if ((*qentp)->priority < prio)
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diff changeset
344 break;
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jlarmour
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diff changeset
345 } // for
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diff changeset
346
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diff changeset
347 qent->next = *qentp;
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diff changeset
348 *qentp = qent;
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diff changeset
349 } // else
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diff changeset
350
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diff changeset
351 qent->priority = prio; // have to set this now so when the sched is
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
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diff changeset
352 // unlocked, other qent's can be added in the
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
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diff changeset
353 // right place
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diff changeset
354 qent->busy = true; // let things know this entry should be ignored until
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diff changeset
355 // it's finished having its data copied
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jlarmour
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diff changeset
356
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diff changeset
357 // unlock the scheduler, and potentially switch threads, but
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diff changeset
358 // that's okay now. We don't want it locked for the expensive memcpy
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diff changeset
359 Cyg_Scheduler::unlock();
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diff changeset
360
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diff changeset
361 qent->buflen = len;
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jlarmour
parents:
diff changeset
362 memcpy( qent->buf(), buf, len );
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jlarmour
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diff changeset
363
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jlarmour
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diff changeset
364 // make available now - setting non-atomically is alright if you think
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jlarmour
parents:
diff changeset
365 // about it - the only thing that matters is that it's completed before
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jlarmour
parents:
diff changeset
366 // the post()
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jlarmour
parents:
diff changeset
367 qent->busy = false;
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diff changeset
368
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jlarmour
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diff changeset
369 // if we have to notify someone, we only do it if no-one's already
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jlarmour
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diff changeset
370 // sitting waiting for a message to appear, AND if it's a transition
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jlarmour
parents:
diff changeset
371 // from empty to non-empty
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jlarmour
parents:
diff changeset
372
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diff changeset
373 if ( callback != NULL && !getsem.waiting() && (0 == getsem.peek()) ) {
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jlarmour
parents:
diff changeset
374 getsem.post();
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jlarmour
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diff changeset
375 callback( *this, callback_data );
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jlarmour
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diff changeset
376 } else
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jlarmour
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diff changeset
377 getsem.post();
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jlarmour
parents:
diff changeset
378
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diff changeset
379 err = OK;
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jlarmour
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diff changeset
380
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jlarmour
parents:
diff changeset
381 exit:
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diff changeset
382 CYG_ASSERT_THISC();
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jlarmour
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diff changeset
383 CYG_REPORT_RETVAL(err);
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jlarmour
parents:
diff changeset
384 return err;
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jlarmour
parents:
diff changeset
385 } // Cyg_Mqueue::put()
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jlarmour
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diff changeset
386
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jlarmour
parents:
diff changeset
387 //------------------------------------------------------------------------
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jlarmour
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diff changeset
388
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
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diff changeset
389
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
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diff changeset
390 // get() returns the oldest highest priority message in the queue in *buf
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diff changeset
391 // 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
392 // actual message size
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jlarmour
parents:
diff changeset
393
191
678094f34118 Merge from eCos master repository on 2001-10-19-06:43:02-BST
jlarmour
parents: 182
diff changeset
394 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
395 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
396 #ifdef CYGFUN_KERNEL_THREADS_TIMER
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
397 , cyg_tick_count timeout
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
398 #endif
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
399 )
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
400 {
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jlarmour
parents:
diff changeset
401 CYG_REPORT_FUNCTYPE( "err=%d");
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jlarmour
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diff changeset
402 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
403 buf, len, prio, block==true );
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jlarmour
parents:
diff changeset
404 CYG_CHECK_DATA_PTRC( buf );
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jlarmour
parents:
diff changeset
405 CYG_CHECK_DATA_PTRC( len );
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jlarmour
parents:
diff changeset
406 if ( NULL != prio )
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jlarmour
parents:
diff changeset
407 CYG_CHECK_DATA_PTRC( prio );
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jlarmour
parents:
diff changeset
408 CYG_ASSERT_THISC();
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jlarmour
parents:
diff changeset
409
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jlarmour
parents:
diff changeset
410 qerr_t err;
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jlarmour
parents:
diff changeset
411 struct qentry *qent;
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jlarmour
parents:
diff changeset
412
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jlarmour
parents:
diff changeset
413 // wait till a q entry is available
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jlarmour
parents:
diff changeset
414 if ( true == block ) {
494
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
415 #ifdef CYGFUN_KERNEL_THREADS_TIMER
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
416 if ( timeout != 0) {
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
417 if ( false == getsem.wait(timeout) ) {
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
418 err = TIMEOUT;
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
419 goto exit;
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 }
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
422 else
cffb2601409c * include/mqueue.hxx: Allow get/put to return time out.
jlarmour
parents: 210
diff changeset
423 #endif
115
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jlarmour
parents:
diff changeset
424 if ( false == getsem.wait() ) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
425 err = INTR;
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jlarmour
parents:
diff changeset
426 goto exit;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
427 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
428 } else {
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429 if ( false == getsem.trywait() ) {
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430 err = WOULDBLOCK;
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431 goto exit;
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432 }
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433 }
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434
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435 // prevent preemption when fiddling with important members
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436
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437 Cyg_Scheduler::lock();
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438
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439 // don't need to check the q - the semaphore tells us there's
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440 // definitely a usable non-busy one there. It's just a question of
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441 // locating it.
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442
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443 if ( !q->busy ) { // fast-track the common case
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444 qent = q;
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445 q = qent->next;
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446 } else {
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447 struct qentry *qtmp;
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448
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449 for ( qtmp=q; !qtmp->next->busy; qtmp=qtmp->next )
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450 CYG_EMPTY_STATEMENT; // skip through
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451
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452 qent = qtmp->next;
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453 qtmp->next = qent->next;
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454 } // else
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455
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456 // now stick at front of freelist, but marked busy
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457 qent->next = freelist;
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458 freelist = qent;
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459
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460 qent->busy = true; // don't let it truly be part of the freelist just yet
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461 // till the data is copied out
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462
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463 // unlock the scheduler, and potentially switch threads, but
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464 // that's okay now. We don't want it locked for the expensive memcpy
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465 Cyg_Scheduler::unlock();
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466
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467 *len = qent->buflen;
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468 if ( NULL != prio )
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469 *prio = qent->priority;
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470 memcpy( buf, qent->buf(), *len );
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471
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472 // make available now - setting non-atomically is alright if you think
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473 // about it - the only thing that matters is that it's completed before
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474 // the post()
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475 qent->busy = false;
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476
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477 putsem.post();
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478
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479 err = OK;
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480
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481 exit:
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482 CYG_ASSERT_THISC();
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483 CYG_REPORT_RETVAL(err);
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484 return err;
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485
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486 } // Cyg_Mqueue::get()
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487
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488 //------------------------------------------------------------------------
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489
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490 // count() returns the number of messages in the queue
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491 inline long
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492 Cyg_Mqueue::count()
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493 {
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494 CYG_REPORT_FUNCTYPE("curmsgs=%d");
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495
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496 long curmsgs = (long)getsem.peek();
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497
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498 CYG_REPORT_RETVAL(curmsgs);
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499 return curmsgs;
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500 } // Cyg_Mqueue::count()
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501
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502 //------------------------------------------------------------------------
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503
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504
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505 // Supply a callback function to call (with the supplied data argument)
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506 // when the queue goes from empty to non-empty (unless someone's already
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507 // doing a get()). This returns the old callback_fn, and if olddata is
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508 // non-NULL sets it to the old data (yes, really!)
191
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509 CYGPRI_KERNEL_SYNCH_MQUEUE_INLINE Cyg_Mqueue::callback_fn_t
115
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510 Cyg_Mqueue::setnotify( callback_fn_t callback_fn, CYG_ADDRWORD data,
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511 CYG_ADDRWORD *olddata)
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512 {
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513 CYG_REPORT_FUNCTYPE("old callback=%08x");
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514 CYG_REPORT_FUNCARG3XV( callback_fn, data, olddata );
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515 if ( NULL != callback_fn )
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516 CYG_CHECK_FUNC_PTRC( callback_fn );
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517 if (NULL != olddata)
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518 CYG_CHECK_DATA_PTRC( olddata );
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519
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520 callback_fn_t oldfn;
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521
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522 // Need to prevent preemption for accessing common structures
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523 // Just locking the scheduler has the least overhead
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524 Cyg_Scheduler::lock();
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525
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526 oldfn = callback;
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527 if (NULL != olddata)
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528 *olddata = callback_data;
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529
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530 callback_data = data;
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531 callback = callback_fn;
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532
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533 Cyg_Scheduler::unlock();
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534
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535 CYG_REPORT_RETVAL(oldfn);
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536 return oldfn;
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537 }
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538
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539 //------------------------------------------------------------------------
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540
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541 #endif /* CYGONCE_KERNEL_MQUEUE_INL multiple inclusion protection */
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542
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543 /* EOF mqueue.inl */