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annotate packages/net/tcpip/current/src/ecos/timeout.c @ 97:ced4577552cd ecos-sw-2000-06-06

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Merge from eCos master repository on 2000-06-06-08:44:00-BST
author jlarmour
date Tue, 06 Jun 2000 08:39:36 +0000
parents
children 02ea4320376c
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97
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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
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45 // Contributors: gthomas
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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
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54 // Timeout support
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55
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56 #ifndef NTIMEOUTS
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57 #define NTIMEOUTS 8
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58 #endif
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59 typedef struct {
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60 cyg_int32 delta; // Number of "ticks" in the future for this timeout
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61 timeout_fun *fun; // Function to execute when it expires
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62 void *arg; // Argument to pass when it does
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63 } timeout_entry;
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64 static timeout_entry timeouts[NTIMEOUTS];
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65 static cyg_handle_t timeout_alarm_handle;
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66 static cyg_alarm timeout_alarm;
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67 static cyg_int32 last_delta;
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68
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69 static void
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70 do_timeout(cyg_handle_t alarm, cyg_addrword_t data)
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71 {
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72 int i;
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73 cyg_int32 min_delta;
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74 timeout_entry *e = timeouts;
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75 min_delta = 0x7FFFFFFF; // Maxint
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76 for (i = 0; i < NTIMEOUTS; i++, e++) {
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77 if (e->delta) {
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78 e->delta -= last_delta;
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79 if (e->delta == 0) {
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80 // Time for this item to 'fire'
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81 (e->fun)(e->arg);
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82 e->fun = 0;
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83 } else {
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84 if (e->delta < min_delta) min_delta = e->delta;
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85 }
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86 }
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87 }
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88 if (min_delta != 0x7FFFFFFF) {
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89 // Still something to do, schedule it
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90 cyg_alarm_initialize(timeout_alarm_handle, cyg_current_time()+min_delta, 0);
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91 last_delta = min_delta;
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92 }
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93 }
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94
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95 cyg_uint32
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96 timeout(timeout_fun *fun, void *arg, cyg_int32 delta)
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97 {
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98 int i;
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99 cyg_int32 min_delta;
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100 static bool init = false;
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101 timeout_entry *e = timeouts;
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102 cyg_uint32 stamp;
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103 if (!init) {
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104 cyg_handle_t h;
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105 cyg_clock_to_counter(cyg_real_time_clock(), &h);
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106 cyg_alarm_create(h, do_timeout, 0, &timeout_alarm_handle, &timeout_alarm);
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107 init = true;
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108 }
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109 stamp = 0; // Assume no slots available
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110 for (i = 0; i < NTIMEOUTS; i++, e++) {
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111 if ((e->delta == 0) && (e->fun == 0)) {
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112 // Free entry
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113 e->delta = delta;
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114 e->fun = fun;
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115 e->arg = arg;
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116 stamp = (cyg_uint32)e;
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117 break;
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118 }
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119 }
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120 e = timeouts;
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121 min_delta = 0x7FFFFFFF;
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122 for (i = 0; i < NTIMEOUTS; i++, e++) {
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123 if (e->delta && (e->delta < min_delta)) min_delta = e->delta;
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124 }
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125 if (min_delta != 0x7FFFFFFF) {
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126 // Still something to do, schedule it
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127 cyg_alarm_initialize(timeout_alarm_handle, cyg_current_time()+min_delta, 0);
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128 last_delta = min_delta;
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129 }
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130 return stamp;
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131 }
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132
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133 void
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134 untimeout(cyg_uint32 stamp)
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135 {
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136 if (stamp != 0) {
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137 timeout_entry *e = (timeout_entry *)stamp;
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138 if (e->fun != 0) {
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139 e->delta = 0;
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140 e->fun = 0;
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141 e->arg = 0;
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142 }
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143 }
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144 }