1 | //========================================================================== |
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2 | // |
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3 | // net/timers.c |
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4 | // |
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5 | // Stand-alone networking support for RedBoot |
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6 | // |
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7 | //========================================================================== |
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8 | //####ECOSGPLCOPYRIGHTBEGIN#### |
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9 | // ------------------------------------------- |
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10 | // This file is part of eCos, the Embedded Configurable Operating System. |
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11 | // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. |
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12 | // |
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13 | // eCos is free software; you can redistribute it and/or modify it under |
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14 | // the terms of the GNU General Public License as published by the Free |
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15 | // Software Foundation; either version 2 or (at your option) any later version. |
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16 | // |
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17 | // eCos is distributed in the hope that it will be useful, but WITHOUT ANY |
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18 | // WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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19 | // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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20 | // for more details. |
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21 | // |
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22 | // You should have received a copy of the GNU General Public License along |
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23 | // with eCos; if not, write to the Free Software Foundation, Inc., |
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24 | // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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25 | // |
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26 | // As a special exception, if other files instantiate templates or use macros |
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27 | // or inline functions from this file, or you compile this file and link it |
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28 | // with other works to produce a work based on this file, this file does not |
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29 | // by itself cause the resulting work to be covered by the GNU General Public |
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30 | // License. However the source code for this file must still be made available |
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31 | // in accordance with section (3) of the GNU General Public License. |
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32 | // |
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33 | // This exception does not invalidate any other reasons why a work based on |
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34 | // this file might be covered by the GNU General Public License. |
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35 | // |
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36 | // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. |
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37 | // at http://sources.redhat.com/ecos/ecos-license/ |
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38 | // ------------------------------------------- |
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39 | //####ECOSGPLCOPYRIGHTEND#### |
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40 | //========================================================================== |
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41 | //#####DESCRIPTIONBEGIN#### |
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42 | // |
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43 | // Author(s): gthomas |
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44 | // Contributors: gthomas |
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45 | // Date: 2000-07-14 |
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46 | // Purpose: |
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47 | // Description: |
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48 | // |
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49 | // This code is part of RedBoot (tm). |
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50 | // |
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51 | //####DESCRIPTIONEND#### |
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52 | // |
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53 | //========================================================================== |
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54 | |
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55 | #include <net/net.h> |
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56 | |
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57 | static timer_t *tmr_list; |
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58 | |
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59 | |
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60 | /* |
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61 | * Set a timer. Caller is responsible for providing the timer_t struct. |
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62 | */ |
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63 | void |
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64 | __timer_set(timer_t *t, unsigned long delay, |
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65 | tmr_handler_t handler, void *user_data) |
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66 | { |
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67 | timer_t *p; |
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68 | |
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69 | t->delay = delay; |
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70 | t->start = MS_TICKS(); |
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71 | t->handler = handler; |
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72 | t->user_data = user_data; |
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73 | |
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74 | for (p = tmr_list; p; p = p->next) |
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75 | if (p == t) { |
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76 | return; |
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77 | } |
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78 | |
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79 | t->next = tmr_list; |
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80 | tmr_list = t; |
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81 | } |
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82 | |
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83 | |
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84 | /* |
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85 | * Remove a given timer from timer list. |
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86 | */ |
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87 | void |
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88 | __timer_cancel(timer_t *t) |
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89 | { |
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90 | timer_t *prev, *p; |
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91 | |
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92 | for (prev = NULL, p = tmr_list; p; prev = p, p = p->next) |
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93 | if (p == t) { |
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94 | if (prev) |
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95 | prev->next = p->next; |
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96 | else |
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97 | tmr_list = p->next; |
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98 | return; |
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99 | } |
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100 | } |
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101 | |
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102 | |
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103 | /* |
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104 | * Poll timer list for timer expirations. |
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105 | */ |
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106 | void |
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107 | __timer_poll(void) |
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108 | { |
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109 | timer_t *prev, *t; |
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110 | |
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111 | prev = NULL; |
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112 | t = tmr_list; |
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113 | while (t) { |
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114 | if ((MS_TICKS_DELAY() - t->start) >= t->delay) { |
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115 | |
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116 | /* remove it before calling handler */ |
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117 | if (prev) |
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118 | prev->next = t->next; |
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119 | else |
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120 | tmr_list = t->next; |
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121 | /* now, call the handler */ |
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122 | t->handler(t->user_data); |
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123 | |
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124 | /* |
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125 | * handler may be time consuming, so start |
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126 | * from beginning of list. |
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127 | */ |
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128 | prev = NULL; |
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129 | t = tmr_list; |
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130 | } else { |
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131 | prev = t; |
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132 | t = t->next; |
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133 | } |
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134 | } |
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135 | } |
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