Mercurial > flash_v2

annotate packages/net/tcpip/current/src/ecos/timeout.c @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents 02ea4320376c
children 6bd9d475ed4b
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1 //==========================================================================
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2 //
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3 // lib/timeout.c
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4 //
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5 // timeout support
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //####BSDCOPYRIGHTBEGIN####
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32 //
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33 // -------------------------------------------
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34 //
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35 // Portions of this software may have been derived from OpenBSD or other sources,
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36 // and are covered by the appropriate copyright disclaimers included herein.
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37 //
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38 // -------------------------------------------
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39 //
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40 //####BSDCOPYRIGHTEND####
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41 //==========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): gthomas, hmt
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45 // Contributors: gthomas, hmt
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46 // Date: 1999-02-05
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47 // Description: Simple timeout functions
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48 //####DESCRIPTIONEND####
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49
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50 #include <sys/param.h>
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51 #include <pkgconf/net.h>
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52 #include <cyg/kernel/kapi.h>
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53 #include <cyg/infra/cyg_ass.h>
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54
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55 // Timeout support
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56
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57 #ifndef NTIMEOUTS
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58 #define NTIMEOUTS 8
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59 #endif
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60 typedef struct {
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61 cyg_int32 delta; // Number of "ticks" in the future for this timeout
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62 timeout_fun *fun; // Function to execute when it expires
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63 void *arg; // Argument to pass when it does
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64 } timeout_entry;
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65 static timeout_entry timeouts[NTIMEOUTS];
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66 static cyg_handle_t timeout_alarm_handle;
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67 static cyg_alarm timeout_alarm;
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68 static cyg_int32 last_delta;
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69 static cyg_tick_count_t last_set_time;
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70
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71 extern cyg_uint32 cyg_in_softnet( void );
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73 static void
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74 do_timeout(cyg_handle_t alarm, cyg_addrword_t data)
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75 {
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76 int i;
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77 cyg_int32 min_delta;
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78 timeout_entry *e;
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79
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80 CYG_ASSERT( 0 < last_delta, "last_delta underflow" );
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81
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82 min_delta = last_delta; // local copy
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83 last_delta = -1; // flag recursive call underway
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84
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85 for (e = timeouts, i = 0; i < NTIMEOUTS; i++, e++) {
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86 if (e->delta) {
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87 CYG_ASSERT( e->delta >= min_delta, "e->delta underflow" );
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88 e->delta -= min_delta;
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89 if (e->delta <= 0) { // Defensive
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90 // Time for this item to 'fire'
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91 timeout_fun *fun = e->fun;
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92 void *arg = e->arg;
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93 // Call it *after* cleansing the record
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94 e->fun = 0;
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95 e->delta = 0;
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96 (*fun)(arg);
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97 }
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98 }
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99 }
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100
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101 // Now scan for a new timeout *after* running all the callbacks
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102 // (because they can add timeouts themselves)
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103 min_delta = 0x7FFFFFFF; // Maxint
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104 for (e = timeouts, i = 0; i < NTIMEOUTS; i++, e++)
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105 if (e->delta)
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106 if (e->delta < min_delta)
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107 min_delta = e->delta;
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108
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109 CYG_ASSERT( 0 < min_delta, "min_delta underflow" );
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110
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111 if (min_delta != 0x7FFFFFFF) {
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112 // Still something to do, schedule it
115
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113 last_set_time = cyg_current_time();
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114 cyg_alarm_initialize(timeout_alarm_handle, last_set_time+min_delta, 0);
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115 last_delta = min_delta;
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116 } else {
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117 last_delta = 0; // flag no activity
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118 }
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119 }
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120
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121 cyg_uint32
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122 timeout(timeout_fun *fun, void *arg, cyg_int32 delta)
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123 {
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124 int i;
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125 static bool init = false;
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126 timeout_entry *e;
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127 cyg_uint32 stamp;
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128
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129 CYG_ASSERT( 0 < delta, "delta is right now, or even sooner!" );
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130
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131 // this needs to be atomic wrt threads and DSRs
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132 cyg_scheduler_lock();
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133
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134 if (!init) {
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135 cyg_handle_t h;
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136 cyg_clock_to_counter(cyg_real_time_clock(), &h);
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137 cyg_alarm_create(h, do_timeout, 0, &timeout_alarm_handle, &timeout_alarm);
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138 init = true;
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139 }
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140
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141 // Renormalize delta wrt the existing set alarm, if there is one
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142 if ( last_delta > 0 )
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143 delta += (cyg_int32)(cyg_current_time() - last_set_time);
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144 // So recorded_delta is set to either:
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145 // alarm is active: delta + NOW - THEN
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146 // alarm is inactive: delta
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147
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148 stamp = 0; // Assume no slots available
115
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149 for (e = timeouts, i = 0; i < NTIMEOUTS; i++, e++) {
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150 if ((e->delta == 0) && (e->fun == 0)) {
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151 // Free entry
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152 e->delta = delta;
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153 e->fun = fun;
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154 e->arg = arg;
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155 stamp = (cyg_uint32)e;
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156 break;
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157 }
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158 }
115
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159
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160 if ( stamp && // we did add a record AND
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161 (0 == last_delta || // alarm was inactive OR
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162 delta < last_delta) ) { // alarm was active but later than we need
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163
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164 // (if last_delta is -1, this call is recursive from the handler so
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165 // also do nothing in that case)
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166
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167 // Here, we know the new item added is sooner than that which was
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168 // most recently set, if any, so we can just go and set it up.
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169 if ( 0 == last_delta )
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170 last_set_time = cyg_current_time();
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171
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172 // So we use, to set the alarm either:
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173 // alarm is active: (delta + NOW - THEN) + THEN
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174 // alarm is inactive: delta + NOW
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175 // and in either case it is true that
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176 // (recorded_delta + last_set_time) == (delta + NOW)
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177 cyg_alarm_initialize(timeout_alarm_handle, last_set_time+delta, 0);
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178 last_delta = delta;
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179 }
115
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180 // Otherwise, the alarm is active, AND it is set to fire sooner than we
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181 // require, so when it does, that will sort out calling the item we
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182 // just added. Or we didn't actually add a record, so nothing has
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183 // changed.
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184
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185 #ifdef CYGPKG_INFRA_DEBUG
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186 // Do some more checking akin to that in the alarm handler:
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187 if ( last_delta != -1 ) { // not a recursive call
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188 CYG_ASSERT( last_delta >= 0, "Bad last delta" );
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189 delta = 0x7fffffff;
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190 for (e = timeouts, i = 0; i < NTIMEOUTS; i++, e++) {
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191 if (e->delta) {
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192 CYG_ASSERT( e->delta >= last_delta, "e->delta underflow" );
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193 CYG_ASSERT( last_set_time + e->delta > cyg_current_time(),
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194 "Recorded alarm not in the future!" );
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195 if ( e->delta < delta )
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196 delta = e->delta;
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197 } else {
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198 CYG_ASSERT( 0 == e->fun, "Function recorded for 0 delta" );
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199 }
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200 }
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201 CYG_ASSERT( delta == last_delta, "We didn't pick the smallest delta!" );
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202 }
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203 #endif
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204
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205 cyg_scheduler_unlock();
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206
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207 return stamp;
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208 }
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209
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210 void
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211 untimeout(timeout_fun *fun, void * arg)
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212 {
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213 int i;
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214 timeout_entry *e;
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215 cyg_scheduler_lock();
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216 for (e = timeouts, i = 0; i < NTIMEOUTS; i++, e++) {
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217 if (e->delta && (e->fun == fun) && (e->arg == arg)) {
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218 e->delta = 0;
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219 e->fun = 0;
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220 break;
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221 }
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222 }
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223 cyg_scheduler_unlock();
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224 }
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225
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226 // EOF timeout.c