Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/include/obsolete/pralarm.h @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 /*
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7 ** File: pralarm.h
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8 ** Description: API to periodic alarms.
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9 **
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10 **
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11 ** Alarms are defined to invoke some client specified function at
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12 ** a time in the future. The notification may be a one time event
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13 ** or repeated at a fixed interval. The interval at which the next
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14 ** notification takes place may be modified by the client code only
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15 ** during the respective notification.
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16 **
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17 ** The notification is delivered on a thread that is part of the
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18 ** alarm context (PRAlarm). The thread will inherit the priority
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19 ** of the Alarm creator.
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20 **
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21 ** Any number of periodic alarms (PRAlarmID) may be created within
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22 ** the context of a single alarm (PRAlarm). The notifications will be
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23 ** scheduled as close to the desired time as possible.
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24 **
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25 ** Repeating periodic notifies are expected to run at a fixed rate.
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26 ** That rate is expressed as some number of notifies per period where
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27 ** the period is much larger than a PRIntervalTime (see prinrval.h).
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28 */
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29
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30 #if !defined(pralarm_h)
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31 #define pralarm_h
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32
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33 #include "prtypes.h"
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34 #include "prinrval.h"
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35
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36
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37 PR_BEGIN_EXTERN_C
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38
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39 /**********************************************************************/
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40 /************************* TYPES AND CONSTANTS ************************/
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41 /**********************************************************************/
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42
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43 typedef struct PRAlarm PRAlarm;
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44 typedef struct PRAlarmID PRAlarmID;
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45
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46 typedef PRBool (PR_CALLBACK *PRPeriodicAlarmFn)(
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47 PRAlarmID *id, void *clientData, PRUint32 late);
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48
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49 /**********************************************************************/
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50 /****************************** FUNCTIONS *****************************/
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51 /**********************************************************************/
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52
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53 /***********************************************************************
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54 ** FUNCTION: PR_CreateAlarm
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55 ** DESCRIPTION:
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56 ** Create an alarm context.
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57 ** INPUTS: void
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58 ** OUTPUTS: None
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59 ** RETURN: PRAlarm*
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60 **
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61 ** SIDE EFFECTS:
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62 ** This creates an alarm context, which is an object used for subsequent
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63 ** notification creations. It also creates a thread that will be used to
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64 ** deliver the notifications that are expected to be defined. The client
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65 ** is resposible for destroying the context when appropriate.
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66 ** RESTRICTIONS:
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67 ** None.
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68 ** MEMORY: The object (PRAlarm) and a thread to support notifications.
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69 ** ALGORITHM: N/A
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70 ***********************************************************************/
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71 NSPR_API(PRAlarm*) PR_CreateAlarm(void);
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72
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73 /***********************************************************************
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74 ** FUNCTION: PR_DestroyAlarm
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75 ** DESCRIPTION:
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76 ** Destroys the context created by PR_CreateAlarm().
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77 ** INPUTS: PRAlarm*
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78 ** OUTPUTS: None
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79 ** RETURN: PRStatus
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80 **
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81 ** SIDE EFFECTS:
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82 ** This destroys the context that was created by PR_CreateAlarm().
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83 ** If there are any active alarms (PRAlarmID), they will be cancelled.
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84 ** Once that is done, the thread that was used to deliver the alarms
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85 ** will be joined.
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86 ** RESTRICTIONS:
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87 ** None.
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88 ** MEMORY: N/A
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89 ** ALGORITHM: N/A
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90 ***********************************************************************/
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91 NSPR_API(PRStatus) PR_DestroyAlarm(PRAlarm *alarm);
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92
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93 /***********************************************************************
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94 ** FUNCTION: PR_SetAlarm
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95 ** DESCRIPTION:
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96 ** Creates a periodic notifier that is to be delivered to a specified
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97 ** function at some fixed interval.
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98 ** INPUTS: PRAlarm *alarm Parent alarm context
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99 ** PRIntervalTime period Interval over which the notifies
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100 ** are delivered.
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101 ** PRUint32 rate The rate within the interval that
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102 ** the notifies will be delivered.
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103 ** PRPeriodicAlarmFn function Entry point where the notifies
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104 ** will be delivered.
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105 ** OUTPUTS: None
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106 ** RETURN: PRAlarmID* Handle to the notifier just created
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107 ** or NULL if the request failed.
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108 **
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109 ** SIDE EFFECTS:
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110 ** A periodic notifier is created. The notifications will be delivered
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111 ** by the alarm's internal thread at a fixed interval whose rate is the
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112 ** number of interrupts per interval specified. The first notification
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113 ** will be delivered as soon as possible, and they will continue until
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114 ** the notifier routine indicates that they should cease of the alarm
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115 ** context is destroyed (PR_DestroyAlarm).
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116 ** RESTRICTIONS:
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117 ** None.
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118 ** MEMORY: Memory for the notifier object.
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119 ** ALGORITHM: The rate at which notifications are delivered are stated
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120 ** to be "'rate' notifies per 'interval'". The exact time of
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121 ** the notification is computed based on a epoch established
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122 ** when the notifier was set. Each notification is delivered
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123 ** not ealier than the epoch plus the fixed rate times the
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124 ** notification sequence number. Such notifications have the
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125 ** potential to be late by not more than 'interval'/'rate'.
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126 ** The amount of lateness of one notification is taken into
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127 ** account on the next in an attempt to avoid long term slew.
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128 ***********************************************************************/
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129 NSPR_API(PRAlarmID*) PR_SetAlarm(
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130 PRAlarm *alarm, PRIntervalTime period, PRUint32 rate,
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131 PRPeriodicAlarmFn function, void *clientData);
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132
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133 /***********************************************************************
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134 ** FUNCTION: PR_ResetAlarm
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135 ** DESCRIPTION:
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136 ** Resets an existing alarm.
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137 ** INPUTS: PRAlarmID *id Identify of the notifier.
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138 ** PRIntervalTime period Interval over which the notifies
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139 ** are delivered.
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140 ** PRUint32 rate The rate within the interval that
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141 ** the notifies will be delivered.
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142 ** OUTPUTS: None
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143 ** RETURN: PRStatus Indication of completion.
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144 **
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145 ** SIDE EFFECTS:
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146 ** An existing alarm may have its period and rate redefined. The
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147 ** additional side effect is that the notifier's epoch is recomputed.
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148 ** The first notification delivered by the newly refreshed alarm is
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149 ** defined to be 'interval'/'rate' from the time of the reset.
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150 ** RESTRICTIONS:
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151 ** This function may only be called in the notifier for that alarm.
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152 ** MEMORY: N/A.
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153 ** ALGORITHM: See PR_SetAlarm().
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154 ***********************************************************************/
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155 NSPR_API(PRStatus) PR_ResetAlarm(
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156 PRAlarmID *id, PRIntervalTime period, PRUint32 rate);
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157
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158 PR_END_EXTERN_C
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159
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160 #endif /* !defined(pralarm_h) */
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161
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162 /* prinrval.h */
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