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145
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1 /* Copyright (C) 2018-2020 Free Software Foundation, Inc.
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131
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2 Contributed by Nicolas Koenig
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3
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4 This file is part of the GNU Fortran runtime library (libgfortran).
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5
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6 Libgfortran is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 Libgfortran is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 #include "libgfortran.h"
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26
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27 #define _GTHREAD_USE_COND_INIT_FUNC
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28 #include "../../libgcc/gthr.h"
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29 #include "io.h"
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30 #include "fbuf.h"
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31 #include "format.h"
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32 #include "unix.h"
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33 #include <string.h>
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34 #include <assert.h>
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35
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36 #include <sys/types.h>
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37
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38 #include "async.h"
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39 #if ASYNC_IO
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40
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41 DEBUG_LINE (__thread const char *aio_prefix = MPREFIX);
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42
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43 DEBUG_LINE (__gthread_mutex_t debug_queue_lock = __GTHREAD_MUTEX_INIT;)
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44 DEBUG_LINE (aio_lock_debug *aio_debug_head = NULL;)
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45
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46 /* Current unit for asynchronous I/O. Needed for error reporting. */
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47
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48 __thread gfc_unit *thread_unit = NULL;
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49
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50 /* Queue entry for the asynchronous I/O entry. */
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51 typedef struct transfer_queue
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52 {
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53 enum aio_do type;
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54 struct transfer_queue *next;
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55 struct st_parameter_dt *new_pdt;
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56 transfer_args arg;
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57 _Bool has_id;
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58 int read_flag;
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59 } transfer_queue;
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60
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61 struct error {
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62 st_parameter_dt *dtp;
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63 int id;
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64 };
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65
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66 /* Helper function to exchange the old vs. a new PDT. */
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67
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68 static void
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69 update_pdt (st_parameter_dt **old, st_parameter_dt *new) {
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70 st_parameter_dt *temp;
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71 NOTE ("Changing pdts, current_unit = %p", (void *) (new->u.p.current_unit));
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72 temp = *old;
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73 *old = new;
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74 if (temp)
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75 free (temp);
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76 }
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77
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78 /* Destroy an adv_cond structure. */
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79
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80 static void
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81 destroy_adv_cond (struct adv_cond *ac)
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82 {
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83 T_ERROR (__gthread_mutex_destroy, &ac->lock);
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84 T_ERROR (__gthread_cond_destroy, &ac->signal);
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85 }
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86
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87 /* Function invoked as start routine for a new asynchronous I/O unit.
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88 Contains the main loop for accepting requests and handling them. */
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89
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90 static void *
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91 async_io (void *arg)
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92 {
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93 DEBUG_LINE (aio_prefix = TPREFIX);
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94 transfer_queue *ctq = NULL, *prev = NULL;
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95 gfc_unit *u = (gfc_unit *) arg;
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96 async_unit *au = u->au;
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97 LOCK (&au->lock);
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98 thread_unit = u;
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99 au->thread = __gthread_self ();
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100 while (true)
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101 {
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102 /* Main loop. At this point, au->lock is always held. */
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103 WAIT_SIGNAL_MUTEX (&au->work, au->tail != NULL, &au->lock);
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104 LOCK (&au->lock);
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105 ctq = au->head;
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106 prev = NULL;
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107 /* Loop over the queue entries until they are finished. */
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108 while (ctq)
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109 {
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110 if (prev)
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111 free (prev);
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112 prev = ctq;
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113 if (!au->error.has_error)
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114 {
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115 UNLOCK (&au->lock);
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116
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117 switch (ctq->type)
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118 {
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119 case AIO_WRITE_DONE:
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120 NOTE ("Finalizing write");
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121 st_write_done_worker (au->pdt);
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122 UNLOCK (&au->io_lock);
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123 break;
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124
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125 case AIO_READ_DONE:
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126 NOTE ("Finalizing read");
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127 st_read_done_worker (au->pdt);
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128 UNLOCK (&au->io_lock);
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129 break;
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130
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131 case AIO_DATA_TRANSFER_INIT:
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132 NOTE ("Data transfer init");
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133 LOCK (&au->io_lock);
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134 update_pdt (&au->pdt, ctq->new_pdt);
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135 data_transfer_init_worker (au->pdt, ctq->read_flag);
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136 break;
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137
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138 case AIO_TRANSFER_SCALAR:
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139 NOTE ("Starting scalar transfer");
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140 ctq->arg.scalar.transfer (au->pdt, ctq->arg.scalar.arg_bt,
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141 ctq->arg.scalar.data,
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142 ctq->arg.scalar.i,
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143 ctq->arg.scalar.s1,
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144 ctq->arg.scalar.s2);
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145 break;
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146
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147 case AIO_TRANSFER_ARRAY:
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148 NOTE ("Starting array transfer");
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149 NOTE ("ctq->arg.array.desc = %p",
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150 (void *) (ctq->arg.array.desc));
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151 transfer_array_inner (au->pdt, ctq->arg.array.desc,
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152 ctq->arg.array.kind,
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153 ctq->arg.array.charlen);
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154 free (ctq->arg.array.desc);
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155 break;
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156
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157 case AIO_CLOSE:
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158 NOTE ("Received AIO_CLOSE");
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159 goto finish_thread;
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160
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161 default:
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162 internal_error (NULL, "Invalid queue type");
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163 break;
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164 }
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165 LOCK (&au->lock);
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166 if (unlikely (au->error.has_error))
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167 au->error.last_good_id = au->id.low - 1;
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168 }
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169 else
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170 {
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171 if (ctq->type == AIO_WRITE_DONE || ctq->type == AIO_READ_DONE)
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172 {
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173 UNLOCK (&au->io_lock);
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174 }
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175 else if (ctq->type == AIO_CLOSE)
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176 {
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177 NOTE ("Received AIO_CLOSE during error condition");
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178 UNLOCK (&au->lock);
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179 goto finish_thread;
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180 }
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181 }
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182
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183 NOTE ("Next ctq, current id: %d", au->id.low);
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184 if (ctq->has_id && au->id.waiting == au->id.low++)
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185 SIGNAL (&au->id.done);
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186
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187 ctq = ctq->next;
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188 }
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189 au->tail = NULL;
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190 au->head = NULL;
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191 au->empty = 1;
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192 UNLOCK (&au->lock);
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193 SIGNAL (&au->emptysignal);
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194 LOCK (&au->lock);
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195 }
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196 finish_thread:
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197 au->tail = NULL;
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198 au->head = NULL;
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199 au->empty = 1;
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200 SIGNAL (&au->emptysignal);
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201 free (ctq);
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202 return NULL;
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203 }
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204
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205 /* Free an asynchronous unit. */
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206
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207 static void
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208 free_async_unit (async_unit *au)
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209 {
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210 if (au->tail)
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211 internal_error (NULL, "Trying to free nonempty asynchronous unit");
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212
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213 destroy_adv_cond (&au->work);
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214 destroy_adv_cond (&au->emptysignal);
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215 destroy_adv_cond (&au->id.done);
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216 T_ERROR (__gthread_mutex_destroy, &au->lock);
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217 free (au);
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218 }
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219
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220 /* Initialize an adv_cond structure. */
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221
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222 static void
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223 init_adv_cond (struct adv_cond *ac)
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224 {
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225 ac->pending = 0;
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226 __GTHREAD_MUTEX_INIT_FUNCTION (&ac->lock);
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145
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227 __GTHREAD_COND_INIT_FUNCTION (&ac->signal);
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131
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228 }
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229
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230 /* Initialize an asyncronous unit, returning zero on success,
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231 nonzero on failure. It also sets u->au. */
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232
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233 void
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234 init_async_unit (gfc_unit *u)
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235 {
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236 async_unit *au;
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237 if (!__gthread_active_p ())
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238 {
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239 u->au = NULL;
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240 return;
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241 }
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242
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243 au = (async_unit *) xmalloc (sizeof (async_unit));
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244 u->au = au;
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245 init_adv_cond (&au->work);
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246 init_adv_cond (&au->emptysignal);
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247 __GTHREAD_MUTEX_INIT_FUNCTION (&au->lock);
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248 __GTHREAD_MUTEX_INIT_FUNCTION (&au->io_lock);
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249 LOCK (&au->lock);
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250 T_ERROR (__gthread_create, &au->thread, &async_io, (void *) u);
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251 au->pdt = NULL;
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252 au->head = NULL;
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253 au->tail = NULL;
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254 au->empty = true;
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255 au->id.waiting = -1;
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256 au->id.low = 0;
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257 au->id.high = 0;
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258 au->error.fatal_error = 0;
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259 au->error.has_error = 0;
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260 au->error.last_good_id = 0;
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261 init_adv_cond (&au->id.done);
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262 UNLOCK (&au->lock);
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263 }
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264
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265 /* Enqueue a transfer statement. */
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266
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267 void
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268 enqueue_transfer (async_unit *au, transfer_args *arg, enum aio_do type)
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269 {
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270 transfer_queue *tq = calloc (sizeof (transfer_queue), 1);
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271 tq->arg = *arg;
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272 tq->type = type;
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273 tq->has_id = 0;
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274 LOCK (&au->lock);
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275 if (!au->tail)
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276 au->head = tq;
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277 else
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278 au->tail->next = tq;
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279 au->tail = tq;
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280 REVOKE_SIGNAL (&(au->emptysignal));
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281 au->empty = false;
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282 UNLOCK (&au->lock);
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283 SIGNAL (&au->work);
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284 }
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285
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286 /* Enqueue an st_write_done or st_read_done which contains an ID. */
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287
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288 int
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289 enqueue_done_id (async_unit *au, enum aio_do type)
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290 {
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291 int ret;
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292 transfer_queue *tq = calloc (sizeof (transfer_queue), 1);
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293
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294 tq->type = type;
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295 tq->has_id = 1;
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296 LOCK (&au->lock);
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297 if (!au->tail)
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298 au->head = tq;
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299 else
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300 au->tail->next = tq;
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301 au->tail = tq;
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302 REVOKE_SIGNAL (&(au->emptysignal));
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303 au->empty = false;
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304 ret = au->id.high++;
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305 NOTE ("Enqueue id: %d", ret);
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306 UNLOCK (&au->lock);
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307 SIGNAL (&au->work);
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308 return ret;
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309 }
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310
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311 /* Enqueue an st_write_done or st_read_done without an ID. */
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312
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313 void
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314 enqueue_done (async_unit *au, enum aio_do type)
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315 {
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316 transfer_queue *tq = calloc (sizeof (transfer_queue), 1);
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317 tq->type = type;
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318 tq->has_id = 0;
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319 LOCK (&au->lock);
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320 if (!au->tail)
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321 au->head = tq;
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322 else
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323 au->tail->next = tq;
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324 au->tail = tq;
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325 REVOKE_SIGNAL (&(au->emptysignal));
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326 au->empty = false;
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327 UNLOCK (&au->lock);
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328 SIGNAL (&au->work);
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329 }
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330
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331 /* Enqueue a CLOSE statement. */
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332
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333 void
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334 enqueue_close (async_unit *au)
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335 {
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336 transfer_queue *tq = calloc (sizeof (transfer_queue), 1);
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337
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338 tq->type = AIO_CLOSE;
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339 LOCK (&au->lock);
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340 if (!au->tail)
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341 au->head = tq;
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342 else
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343 au->tail->next = tq;
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344 au->tail = tq;
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345 REVOKE_SIGNAL (&(au->emptysignal));
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346 au->empty = false;
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347 UNLOCK (&au->lock);
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348 SIGNAL (&au->work);
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349 }
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350
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351 /* The asynchronous unit keeps the currently active PDT around.
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352 This function changes that to the current one. */
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353
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354 void
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355 enqueue_data_transfer_init (async_unit *au, st_parameter_dt *dt, int read_flag)
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356 {
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357 st_parameter_dt *new = xmalloc (sizeof (st_parameter_dt));
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358 transfer_queue *tq = xmalloc (sizeof (transfer_queue));
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359
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360 memcpy ((void *) new, (void *) dt, sizeof (st_parameter_dt));
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361
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362 NOTE ("dt->internal_unit_desc = %p", dt->internal_unit_desc);
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363 NOTE ("common.flags & mask = %d", dt->common.flags & IOPARM_LIBRETURN_MASK);
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364 tq->next = NULL;
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365 tq->type = AIO_DATA_TRANSFER_INIT;
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366 tq->read_flag = read_flag;
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367 tq->has_id = 0;
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368 tq->new_pdt = new;
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369 LOCK (&au->lock);
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370
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371 if (!au->tail)
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372 au->head = tq;
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373 else
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374 au->tail->next = tq;
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375 au->tail = tq;
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376 REVOKE_SIGNAL (&(au->emptysignal));
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377 au->empty = 0;
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378 UNLOCK (&au->lock);
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379 SIGNAL (&au->work);
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380 }
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381
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382 /* Collect the errors that may have happened asynchronously. Return true if
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383 an error has been encountered. */
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384
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385 bool
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386 collect_async_errors (st_parameter_common *cmp, async_unit *au)
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387 {
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388 bool has_error = au->error.has_error;
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389
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390 if (has_error)
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391 {
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392 if (generate_error_common (cmp, au->error.family, au->error.message))
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393 {
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394 au->error.has_error = 0;
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395 au->error.cmp = NULL;
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396 }
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397 else
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398 {
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399 /* The program will exit later. */
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400 au->error.fatal_error = true;
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401 }
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402 }
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403 return has_error;
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404 }
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405
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406 /* Perform a wait operation on an asynchronous unit with an ID specified,
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407 which means collecting the errors that may have happened asynchronously.
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408 Return true if an error has been encountered. */
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409
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410 bool
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411 async_wait_id (st_parameter_common *cmp, async_unit *au, int i)
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412 {
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413 bool ret;
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414
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415 if (au == NULL)
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416 return false;
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417
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418 if (cmp == NULL)
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419 cmp = au->error.cmp;
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420
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421 if (au->error.has_error)
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422 {
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423 if (i <= au->error.last_good_id)
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424 return false;
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425
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426 return collect_async_errors (cmp, au);
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427 }
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428
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429 LOCK (&au->lock);
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430 NOTE ("Waiting for id %d", i);
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431 if (au->id.waiting < i)
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432 au->id.waiting = i;
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433 UNLOCK (&au->lock);
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434 SIGNAL (&(au->work));
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435 LOCK (&au->lock);
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436 WAIT_SIGNAL_MUTEX (&(au->id.done),
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437 (au->id.low >= au->id.waiting || au->empty), &au->lock);
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438 LOCK (&au->lock);
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439 ret = collect_async_errors (cmp, au);
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440 UNLOCK (&au->lock);
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441 return ret;
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442 }
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443
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444 /* Perform a wait operation an an asynchronous unit without an ID. */
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445
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446 bool
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447 async_wait (st_parameter_common *cmp, async_unit *au)
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448 {
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449 bool ret;
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450
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451 if (au == NULL)
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452 return false;
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453
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|
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454 if (cmp == NULL)
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|
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455 cmp = au->error.cmp;
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|
|
456
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|
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457 SIGNAL (&(au->work));
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|
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458 LOCK (&(au->lock));
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|
|
459
|
|
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460 if (au->empty)
|
|
|
461 {
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|
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462 ret = collect_async_errors (cmp, au);
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|
|
463 UNLOCK (&au->lock);
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|
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464 return ret;
|
|
|
465 }
|
|
|
466
|
|
|
467 WAIT_SIGNAL_MUTEX (&(au->emptysignal), (au->empty), &au->lock);
|
|
|
468 ret = collect_async_errors (cmp, au);
|
|
|
469 return ret;
|
|
|
470 }
|
|
|
471
|
|
|
472 /* Close an asynchronous unit. */
|
|
|
473
|
|
|
474 void
|
|
|
475 async_close (async_unit *au)
|
|
|
476 {
|
|
|
477 if (au == NULL)
|
|
|
478 return;
|
|
|
479
|
|
|
480 NOTE ("Closing async unit");
|
|
|
481 enqueue_close (au);
|
|
|
482 T_ERROR (__gthread_join, au->thread, NULL);
|
|
|
483 free_async_unit (au);
|
|
|
484 }
|
|
|
485
|
|
|
486 #else
|
|
|
487
|
|
|
488 /* Only set u->au to NULL so no async I/O will happen. */
|
|
|
489
|
|
|
490 void
|
|
|
491 init_async_unit (gfc_unit *u)
|
|
|
492 {
|
|
|
493 u->au = NULL;
|
|
|
494 return;
|
|
|
495 }
|
|
|
496
|
|
|
497 /* Do-nothing function, which will not be called. */
|
|
|
498
|
|
|
499 void
|
|
|
500 enqueue_transfer (async_unit *au, transfer_args *arg, enum aio_do type)
|
|
|
501 {
|
|
|
502 return;
|
|
|
503 }
|
|
|
504
|
|
|
505 /* Do-nothing function, which will not be called. */
|
|
|
506
|
|
|
507 int
|
|
|
508 enqueue_done_id (async_unit *au, enum aio_do type)
|
|
|
509 {
|
|
|
510 return 0;
|
|
|
511 }
|
|
|
512
|
|
|
513 /* Do-nothing function, which will not be called. */
|
|
|
514
|
|
|
515 void
|
|
|
516 enqueue_done (async_unit *au, enum aio_do type)
|
|
|
517 {
|
|
|
518 return;
|
|
|
519 }
|
|
|
520
|
|
|
521 /* Do-nothing function, which will not be called. */
|
|
|
522
|
|
|
523 void
|
|
|
524 enqueue_close (async_unit *au)
|
|
|
525 {
|
|
|
526 return;
|
|
|
527 }
|
|
|
528
|
|
|
529 /* Do-nothing function, which will not be called. */
|
|
|
530
|
|
|
531 void
|
|
|
532 enqueue_data_transfer_init (async_unit *au, st_parameter_dt *dt, int read_flag)
|
|
|
533 {
|
|
|
534 return;
|
|
|
535 }
|
|
|
536
|
|
|
537 /* Do-nothing function, which will not be called. */
|
|
|
538
|
|
|
539 bool
|
|
|
540 collect_async_errors (st_parameter_common *cmp, async_unit *au)
|
|
|
541 {
|
|
|
542 return false;
|
|
|
543 }
|
|
|
544
|
|
|
545 /* Do-nothing function, which will not be called. */
|
|
|
546
|
|
|
547 bool
|
|
|
548 async_wait_id (st_parameter_common *cmp, async_unit *au, int i)
|
|
|
549 {
|
|
|
550 return false;
|
|
|
551 }
|
|
|
552
|
|
|
553 /* Do-nothing function, which will not be called. */
|
|
|
554
|
|
|
555 bool
|
|
|
556 async_wait (st_parameter_common *cmp, async_unit *au)
|
|
|
557 {
|
|
|
558 return false;
|
|
|
559 }
|
|
|
560
|
|
|
561 /* Do-nothing function, which will not be called. */
|
|
|
562
|
|
|
563 void
|
|
|
564 async_close (async_unit *au)
|
|
|
565 {
|
|
|
566 return;
|
|
|
567 }
|
|
|
568
|
|
|
569 #endif
|
