Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/include/prmwait.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +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 #if defined(_PRMWAIT_H)
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7 #else
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8 #define _PRMWAIT_H
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9
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10 #include "prio.h"
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11 #include "prtypes.h"
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12 #include "prclist.h"
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13
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14 PR_BEGIN_EXTERN_C
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15
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16 /********************************************************************************/
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17 /********************************************************************************/
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18 /********************************************************************************/
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19 /****************************** WARNING ****************************/
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20 /********************************************************************************/
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21 /**************************** This is work in progress. *************************/
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22 /************************** Do not make any assumptions *************************/
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23 /************************** about the stability of this *************************/
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24 /************************** API or the underlying imple- ************************/
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25 /************************** mentation. ************************/
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26 /********************************************************************************/
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27 /********************************************************************************/
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28
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29 /*
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30 ** STRUCTURE: PRWaitGroup
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31 ** DESCRIPTION:
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32 ** The client may define several wait groups in order to semantically
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33 ** tie a collection of file descriptors for a single purpose. This allows
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34 ** easier dispatching of threads that returned with active file descriptors
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35 ** from the wait function.
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36 */
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37 typedef struct PRWaitGroup PRWaitGroup;
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38
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39 /*
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40 ** ENUMERATION: PRMWStatus
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41 ** DESCRIPTION:
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42 ** This enumeration is used to indicate the completion status of
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43 ** a receive wait object. Generally stated, a positive value indicates
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44 ** that the operation is not yet complete. A zero value indicates
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45 ** success (similar to PR_SUCCESS) and any negative value is an
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46 ** indication of failure. The reason for the failure can be retrieved
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47 ** by calling PR_GetError().
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48 **
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49 ** PR_MW_PENDING The operation is still pending. None of the other
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50 ** fields of the object are currently valid.
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51 ** PR_MW_SUCCESS The operation is complete and it was successful.
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52 ** PR_MW_FAILURE The operation failed. The reason for the failure
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53 ** can be retrieved by calling PR_GetError().
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54 ** PR_MW_TIMEOUT The amount of time allowed for by the object's
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55 ** 'timeout' field has expired w/o the operation
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56 ** otherwise coming to closure.
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57 ** PR_MW_INTERRUPT The operation was cancelled, either by the client
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58 ** calling PR_CancelWaitFileDesc() or destroying the
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59 ** entire wait group (PR_DestroyWaitGroup()).
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60 */
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61 typedef enum PRMWStatus
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62 {
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63 PR_MW_PENDING = 1,
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64 PR_MW_SUCCESS = 0,
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65 PR_MW_FAILURE = -1,
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66 PR_MW_TIMEOUT = -2,
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67 PR_MW_INTERRUPT = -3
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68 } PRMWStatus;
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69
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70 /*
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71 ** STRUCTURE: PRMemoryDescriptor
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72 ** DESCRIPTION:
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73 ** THis is a descriptor for an interval of memory. It contains a
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74 ** pointer to the first byte of that memory and the length (in
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75 ** bytes) of the interval.
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76 */
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77 typedef struct PRMemoryDescriptor
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78 {
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79 void *start; /* pointer to first byte of memory */
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80 PRSize length; /* length (in bytes) of memory interval */
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81 } PRMemoryDescriptor;
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82
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83 /*
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84 ** STRUCTURE: PRMWaitClientData
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85 ** DESCRIPTION:
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86 ** An opague stucture for which a client MAY give provide a concrete
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87 ** definition and associate with a receive descriptor. The NSPR runtime
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88 ** does not manage this field. It is completely up to the client.
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89 */
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90 typedef struct PRMWaitClientData PRMWaitClientData;
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91
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92 /*
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93 ** STRUCTURE: PRRecvWait
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94 ** DESCRIPTION:
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95 ** A receive wait object contains the file descriptor that is subject
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96 ** to the wait and the amount of time (beginning epoch established
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97 ** when the object is presented to the runtime) the the channel should
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98 ** block before abandoning the process.
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99 **
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100 ** The success of the wait operation will be noted in the object's
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101 ** 'outcome' field. The fields are not valid when the NSPR runtime
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102 ** is in possession of the object.
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103 **
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104 ** The memory descriptor describes an interval of writable memory
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105 ** in the caller's address space where data from an initial read
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106 ** can be placed. The description may indicate a null interval.
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107 */
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108 typedef struct PRRecvWait
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109 {
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110 PRCList internal; /* internal runtime linkages */
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111
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112 PRFileDesc *fd; /* file descriptor associated w/ object */
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113 PRMWStatus outcome; /* outcome of the current/last operation */
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114 PRIntervalTime timeout; /* time allowed for entire operation */
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115
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116 PRInt32 bytesRecv; /* number of bytes transferred into buffer */
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117 PRMemoryDescriptor buffer; /* where to store first segment of input data */
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118 PRMWaitClientData *client; /* pointer to arbitrary client defined data */
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119 } PRRecvWait;
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120
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121 /*
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122 ** STRUCTURE: PRMWaitEnumerator
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123 ** DESCRIPTION:
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124 ** An enumeration object is used to store the state of an existing
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125 ** enumeration over a wait group. The opaque object must be allocated
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126 ** by the client and the reference presented on each call to the
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127 ** pseudo-stateless enumerator. The enumeration objects are sharable
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128 ** only in serial fashion.
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129 */
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130 typedef struct PRMWaitEnumerator PRMWaitEnumerator;
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131
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132
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133 /*
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134 ** FUNCTION: PR_AddWaitFileDesc
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135 ** DESCRIPTION:
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136 ** This function will effectively add a file descriptor to the
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137 ** list of those waiting for network receive. The new descriptor
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138 ** will be semantically tied to the wait group specified.
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139 **
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140 ** The ownership for the storage pointed to by 'desc' is temporarily
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141 ** passed over the the NSPR runtime. It will be handed back by the
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142 ** function PR_WaitRecvReady().
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143 **
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144 ** INPUTS
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145 ** group A reference to a PRWaitGroup or NULL. Wait groups are
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146 ** created by calling PR_CreateWaitGroup() and are used
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147 ** to semantically group various file descriptors by the
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148 ** client's application.
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149 ** desc A reference to a valid PRRecvWait. The object of the
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150 ** reference must be preserved and not be modified
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151 ** until its ownership is returned to the client.
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152 ** RETURN
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153 ** PRStatus An indication of success. If equal to PR_FAILUE details
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154 ** of the failure are avaiable via PR_GetError().
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155 **
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156 ** ERRORS
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157 ** PR_INVALID_ARGUMENT_ERROR
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158 ** Invalid 'group' identifier or duplicate 'desc' object.
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159 ** PR_OUT_OF_MEMORY_ERROR
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160 ** Insuffient memory for internal data structures.
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161 ** PR_INVALID_STATE_ERROR
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162 ** The group is being destroyed.
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163 */
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164 NSPR_API(PRStatus) PR_AddWaitFileDesc(PRWaitGroup *group, PRRecvWait *desc);
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165
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166 /*
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167 ** FUNCTION: PR_WaitRecvReady
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168 ** DESCRIPTION:
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169 ** PR_WaitRecvReady will block the calling thread until one of the
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170 ** file descriptors that have been added via PR_AddWaitFileDesc is
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171 ** available for input I/O.
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172 ** INPUT
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173 ** group A pointer to a valid PRWaitGroup or NULL (the null
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174 ** group. The function will block the caller until a
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175 ** channel from the wait group becomes ready for receive
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176 ** or there is some sort of error.
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177 ** RETURN
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178 ** PRReciveWait
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179 ** When the caller is resumed it is either returned a
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180 ** valid pointer to a previously added receive wait or
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181 ** a NULL. If the latter, the function has terminated
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182 ** for a reason that can be determined by calling
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183 ** PR_GetError().
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184 ** If a valid pointer is returned, the reference is to the
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185 ** file descriptor contained in the receive wait object.
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186 ** The outcome of the wait operation may still fail, and
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187 ** if it has, that fact will be noted in the object's
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188 ** outcome field. Details can be retrieved from PR_GetError().
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189 **
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190 ** ERRORS
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191 ** PR_INVALID_ARGUMENT_ERROR
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192 ** The 'group' is not known by the runtime.
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193 ** PR_PENDING_INTERRUPT_ERROR
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194 The thread was interrupted.
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195 ** PR_INVALID_STATE_ERROR
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196 ** The group is being destroyed.
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197 */
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198 NSPR_API(PRRecvWait*) PR_WaitRecvReady(PRWaitGroup *group);
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199
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200 /*
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201 ** FUNCTION: PR_CancelWaitFileDesc
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202 ** DESCRIPTION:
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203 ** PR_CancelWaitFileDesc is provided as a means for cancelling operations
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204 ** on objects previously submitted by use of PR_AddWaitFileDesc(). If
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205 ** the runtime knows of the object, it will be marked as having failed
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206 ** because it was interrupted (similar to PR_Interrupt()). The first
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207 ** available thread waiting on the group will be made to return the
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208 ** PRRecvWait object with the outcome noted.
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209 **
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210 ** INPUTS
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211 ** group The wait group under which the wait receive object was
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212 ** added.
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213 ** desc A pointer to the wait receive object that is to be
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214 ** cancelled.
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215 ** RETURN
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216 ** PRStatus If the wait receive object was located and associated
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217 ** with the specified wait group, the status returned will
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218 ** be PR_SUCCESS. There is still a race condition that would
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219 ** permit the offected object to complete normally, but it
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220 ** is assured that it will complete in the near future.
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221 ** If the receive object or wait group are invalid, the
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222 ** function will return with a status of PR_FAILURE.
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223 **
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224 ** ERRORS
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225 ** PR_INVALID_ARGUMENT_ERROR
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226 ** The 'group' argument is not recognized as a valid group.
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227 ** PR_COLLECTION_EMPTY_ERROR
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228 ** There are no more receive wait objects in the group's
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229 ** collection.
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230 ** PR_INVALID_STATE_ERROR
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231 ** The group is being destroyed.
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232 */
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233 NSPR_API(PRStatus) PR_CancelWaitFileDesc(PRWaitGroup *group, PRRecvWait *desc);
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234
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235 /*
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236 ** FUNCTION: PR_CancelWaitGroup
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237 ** DESCRIPTION:
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238 ** PR_CancelWaitGroup is provided as a means for cancelling operations
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239 ** on objects previously submitted by use of PR_AddWaitFileDesc(). Each
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240 ** successive call will return a pointer to a PRRecvWait object that
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241 ** was previously registered via PR_AddWaitFileDesc(). If no wait
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242 ** objects are associated with the wait group, a NULL will be returned.
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243 ** This function should be called in a loop until a NULL is returned
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244 ** to reclaim all the wait objects prior to calling PR_DestroyWaitGroup().
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245 **
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246 ** INPUTS
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247 ** group The wait group under which the wait receive object was
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248 ** added.
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249 ** RETURN
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250 ** PRRecvWait* If the wait group is valid and at least one receive wait
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251 ** object is present in the group, that object will be
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252 ** marked as PR_MW_INTERRUPT'd and removed from the group's
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253 ** queues. Otherwise a NULL will be returned and the reason
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254 ** for the NULL may be retrieved by calling PR_GetError().
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255 **
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256 ** ERRORS
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257 ** PR_INVALID_ARGUMENT_ERROR
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258 ** PR_GROUP_EMPTY_ERROR
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259 */
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260 NSPR_API(PRRecvWait*) PR_CancelWaitGroup(PRWaitGroup *group);
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261
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262 /*
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263 ** FUNCTION: PR_CreateWaitGroup
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264 ** DESCRIPTION:
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265 ** A wait group is an opaque object that a client may create in order
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266 ** to semantically group various wait requests. Each wait group is
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267 ** unique, including the default wait group (NULL). A wait request
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268 ** that was added under a wait group will only be serviced by a caller
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269 ** that specified the same wait group.
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270 **
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271 ** INPUT
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272 ** size The size of the hash table to be used to contain the
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273 ** receive wait objects. This is just the initial size.
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274 ** It will grow as it needs to, but to avoid that hassle
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275 ** one can suggest a suitable size initially. It should
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276 ** be ~30% larger than the maximum number of receive wait
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277 ** objects expected.
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278 ** RETURN
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279 ** PRWaitGroup If successful, the function will return a pointer to an
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280 ** object that was allocated by and owned by the runtime.
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281 ** The reference remains valid until it is explicitly destroyed
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282 ** by calling PR_DestroyWaitGroup().
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283 **
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284 ** ERRORS
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285 ** PR_OUT_OF_MEMORY_ERROR
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286 */
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287 NSPR_API(PRWaitGroup*) PR_CreateWaitGroup(PRInt32 size);
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288
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289 /*
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290 ** FUNCTION: PR_DestroyWaitGroup
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291 ** DESCRIPTION:
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292 ** Undo the effects of PR_CreateWaitGroup(). Any receive wait operations
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293 ** on the group will be treated as if the each had been the target of a
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294 ** PR_CancelWaitFileDesc().
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295 **
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296 ** INPUT
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297 ** group Reference to a wait group previously allocated using
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298 ** PR_CreateWaitGroup().
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299 ** RETURN
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300 ** PRStatus Will be PR_SUCCESS if the wait group was valid and there
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301 ** are no receive wait objects in that group. Otherwise
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302 ** will indicate PR_FAILURE.
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303 **
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304 ** ERRORS
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305 ** PR_INVALID_ARGUMENT_ERROR
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306 ** The 'group' argument does not reference a known object.
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307 ** PR_INVALID_STATE_ERROR
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308 ** The group still contains receive wait objects.
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309 */
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310 NSPR_API(PRStatus) PR_DestroyWaitGroup(PRWaitGroup *group);
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311
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312 /*
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313 ** FUNCTION: PR_CreateMWaitEnumerator
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314 ** DESCRIPTION:
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315 ** The PR_CreateMWaitEnumerator() function returns a reference to an
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316 ** opaque PRMWaitEnumerator object. The enumerator object is required
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317 ** as an argument for each successive call in the stateless enumeration
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318 ** of the indicated wait group.
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319 **
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320 ** group The wait group that the enumeration is intended to
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321 ** process. It may be be the default wait group (NULL).
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322 ** RETURN
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323 ** PRMWaitEnumerator* group
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324 ** A reference to an object that will be used to store
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325 ** intermediate state of enumerations.
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326 ** ERRORS
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327 ** Errors are indicated by the function returning a NULL.
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328 ** PR_INVALID_ARGUMENT_ERROR
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329 ** The 'group' argument does not reference a known object.
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330 ** PR_OUT_OF_MEMORY_ERROR
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331 */
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332 NSPR_API(PRMWaitEnumerator*) PR_CreateMWaitEnumerator(PRWaitGroup *group);
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333
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334 /*
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335 ** FUNCTION: PR_DestroyMWaitEnumerator
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336 ** DESCRIPTION:
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337 ** Destroys the object created by PR_CreateMWaitEnumerator(). The reference
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338 ** used as an argument becomes invalid.
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339 **
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340 ** INPUT
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341 ** PRMWaitEnumerator* enumerator
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342 ** The PRMWaitEnumerator object to destroy.
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343 ** RETURN
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344 ** PRStatus
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345 ** PR_SUCCESS if successful, PR_FAILURE otherwise.
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346 ** ERRORS
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347 ** PR_INVALID_ARGUMENT_ERROR
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348 ** The enumerator is invalid.
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349 */
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350 NSPR_API(PRStatus) PR_DestroyMWaitEnumerator(PRMWaitEnumerator* enumerator);
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351
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352 /*
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353 ** FUNCTION: PR_EnumerateWaitGroup
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354 ** DESCRIPTION:
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355 ** PR_EnumerateWaitGroup is a thread safe enumerator over a wait group.
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356 ** Each call to the enumerator must present a valid PRMWaitEnumerator
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357 ** rererence and a pointer to the "previous" element returned from the
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358 ** enumeration process or a NULL.
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359 **
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360 ** An enumeration is started by passing a NULL as the "previous" value.
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361 ** Subsequent calls to the enumerator must pass in the result of the
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362 ** previous call. The enumeration end is signaled by the runtime returning
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363 ** a NULL as the result.
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364 **
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365 ** Modifications to the content of the wait group are allowed during
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366 ** an enumeration. The effect is that the enumeration may have to be
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367 ** "reset" and that may result in duplicates being returned from the
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368 ** enumeration.
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369 **
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370 ** An enumeration may be abandoned at any time. The runtime is not
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371 ** keeping any state, so there are no issues in that regard.
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372 */
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373 NSPR_API(PRRecvWait*) PR_EnumerateWaitGroup(
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374 PRMWaitEnumerator *enumerator, const PRRecvWait *previous);
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375
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376 PR_END_EXTERN_C
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377
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378 #endif /* defined(_PRMWAIT_H) */
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379
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380 /* prmwait.h */
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