examples/msg/actions/actions.c

   1 /* Copyright (c) 2009, 2010. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include "msg/msg.h"            /* Yeah! If you want to use msg, you need to include msg/msg.h */
  10 #include "simix/simix.h"        /* semaphores for the barrier */
  11 #include "xbt.h"                /* calloc, printf */
  12 #include "simgrid_config.h"     /* getline */
  13 #include "instr/instr_private.h"
  14
  15 XBT_LOG_NEW_DEFAULT_CATEGORY(actions,
  16                              "Messages specific for this msg example");
  17 int communicator_size = 0;
  18
  19 static void action_Isend(xbt_dynar_t action);
  20
  21 typedef struct  {
  22   int last_Irecv_sender_id;
  23   int bcast_counter;
  24   int reduce_counter;
  25   int allReduce_counter;
  26   xbt_dynar_t isends; /* of msg_comm_t */
  27   /* Used to implement irecv+wait */
  28   xbt_dynar_t irecvs; /* of msg_comm_t */
  29   xbt_dynar_t tasks; /* of m_task_t */
  30 } s_process_globals_t, *process_globals_t;
  31
  32 /* Helper function */
  33 static double parse_double(const char *string)
  34 {
  35   double value;
  36   char *endptr;
  37
  38   value = strtod(string, &endptr);
  39   if (*endptr != '\0')
  40     THROW1(unknown_error, 0, "%s is not a double", string);
  41   return value;
  42 }
  43
  44 static int get_rank (const char *process_name)
  45 {
  46   return atoi(&(process_name[1]));
  47 }
  48
  49 static void asynchronous_cleanup(void) {
  50   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
  51
  52   /* Destroy any isend which correspond to completed communications */
  53   int found;
  54   msg_comm_t comm;
  55   while ((found = MSG_comm_testany(globals->isends)) != -1) {
  56     xbt_dynar_remove_at(globals->isends,found,&comm);
  57     MSG_comm_destroy(comm);
  58   }
  59 }
  60
  61 /* My actions */
  62 static void action_send(xbt_dynar_t action)
  63 {
  64   char *name = NULL;
  65   char to[250];
  66   char *size_str = xbt_dynar_get_as(action, 3, char *);
  67   double size=parse_double(size_str);
  68   double clock = MSG_get_clock(); /* this "call" is free thanks to inlining */
  69
  70   sprintf(to, "%s_%s", MSG_process_get_name(MSG_process_self()),
  71           xbt_dynar_get_as(action, 2, char *));
  72   //  char *to =  xbt_dynar_get_as(action, 2, char *);
  73
  74   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
  75     name = xbt_str_join(action, " ");
  76
  77 #ifdef HAVE_TRACING
  78   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
  79   int dst_traced = get_rank(xbt_dynar_get_as(action, 2, char *));
  80   TRACE_smpi_ptp_in(rank, rank, dst_traced, "send");
  81   TRACE_smpi_send(rank, rank, dst_traced);
  82 #endif
  83
  84   DEBUG2("Entering Send: %s (size: %lg)", name, size);
  85    if (size<65536) {
  86      action_Isend(action);
  87    } else {
  88      MSG_task_send(MSG_task_create(name, 0, size, NULL), to);
  89    }
  90
  91    VERB2("%s %f", name, MSG_get_clock() - clock);
  92
  93   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
  94     free(name);
  95
  96 #ifdef HAVE_TRACING
  97   TRACE_smpi_ptp_out(rank, rank, dst_traced, "send");
  98 #endif
  99
 100   asynchronous_cleanup();
 101 }
 102
 103 static void action_Isend(xbt_dynar_t action)
 104 {
 105   char to[250];
 106   //  char *to = xbt_dynar_get_as(action, 2, char *);
 107   char *size = xbt_dynar_get_as(action, 3, char *);
 108   double clock = MSG_get_clock();
 109   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 110
 111
 112   sprintf(to, "%s_%s", MSG_process_get_name(MSG_process_self()),
 113           xbt_dynar_get_as(action, 2, char *));
 114
 115   msg_comm_t comm =
 116       MSG_task_isend( MSG_task_create(to,0,parse_double(size),NULL), to);
 117   xbt_dynar_push(globals->isends,&comm);
 118
 119   DEBUG1("Isend on %s", MSG_process_get_name(MSG_process_self()));
 120   VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 121
 122   asynchronous_cleanup();
 123 }
 124
 125
 126 static void action_recv(xbt_dynar_t action)
 127 {
 128   char *name = NULL;
 129   char mailbox_name[250];
 130   m_task_t task = NULL;
 131   double clock = MSG_get_clock();
 132   //FIXME: argument of action ignored so far; semantic not clear
 133   //char *from=xbt_dynar_get_as(action,2,char*);
 134   sprintf(mailbox_name, "%s_%s", xbt_dynar_get_as(action, 2, char *),
 135           MSG_process_get_name(MSG_process_self()));
 136
 137   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 138     name = xbt_str_join(action, " ");
 139
 140 #ifdef HAVE_TRACING
 141   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
 142   int src_traced = get_rank(xbt_dynar_get_as(action, 2, char *));
 143   TRACE_smpi_ptp_in(rank, src_traced, rank, "recv");
 144 #endif
 145
 146   DEBUG1("Receiving: %s", name);
 147   MSG_task_receive(&task, mailbox_name);
 148   //  MSG_task_receive(&task, MSG_process_get_name(MSG_process_self()));
 149   VERB2("%s %f", name, MSG_get_clock() - clock);
 150   MSG_task_destroy(task);
 151
 152   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 153     free(name);
 154 #ifdef HAVE_TRACING
 155   TRACE_smpi_ptp_out(rank, src_traced, rank, "recv");
 156   TRACE_smpi_recv(rank, src_traced, rank);
 157 #endif
 158
 159   asynchronous_cleanup();
 160 }
 161
 162 static void action_Irecv(xbt_dynar_t action)
 163 {
 164   char mailbox[250];
 165   double clock = MSG_get_clock();
 166   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 167
 168   DEBUG1("Irecv on %s", MSG_process_get_name(MSG_process_self()));
 169 #ifdef HAVE_TRACING
 170   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
 171   int src_traced = get_rank(xbt_dynar_get_as(action, 2, char *));
 172   globals->last_Irecv_sender_id = src_traced;
 173   MSG_process_set_data(MSG_process_self(), (void *) globals);
 174
 175   TRACE_smpi_ptp_in(rank, src_traced, rank, "Irecv");
 176 #endif
 177
 178   sprintf(mailbox, "%s_%s", xbt_dynar_get_as(action, 2, char *),
 179           MSG_process_get_name(MSG_process_self()));
 180   m_task_t t=NULL;
 181   xbt_dynar_push(globals->tasks,&t);
 182   msg_comm_t c =
 183       MSG_task_irecv(
 184           xbt_dynar_get_ptr(globals->tasks, xbt_dynar_length(globals->tasks)-1),
 185           mailbox);
 186   xbt_dynar_push(globals->irecvs,&c);
 187
 188   VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 189
 190 #ifdef HAVE_TRACING
 191   TRACE_smpi_ptp_out(rank, src_traced, rank, "Irecv");
 192 #endif
 193
 194   asynchronous_cleanup();
 195 }
 196
 197
 198 static void action_wait(xbt_dynar_t action)
 199 {
 200   char *name = NULL;
 201   m_task_t task = NULL;
 202   msg_comm_t comm;
 203   double clock = MSG_get_clock();
 204   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 205
 206   xbt_assert1(xbt_dynar_length(globals->irecvs),
 207       "action wait not preceeded by any irecv: %s", xbt_str_join(action," "));
 208
 209   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 210     name = xbt_str_join(action, " ");
 211 #ifdef HAVE_TRACING
 212   process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 213   int src_traced = counters->last_Irecv_sender_id;
 214   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
 215   TRACE_smpi_ptp_in(rank, src_traced, rank, "wait");
 216 #endif
 217
 218   DEBUG1("Entering %s", name);
 219   comm = xbt_dynar_pop_as(globals->irecvs,msg_comm_t);
 220   MSG_comm_wait(comm,-1);
 221   task = xbt_dynar_pop_as(globals->tasks,m_task_t);
 222   MSG_comm_destroy(comm);
 223   MSG_task_destroy(task);
 224
 225   VERB2("%s %f", name, MSG_get_clock() - clock);
 226   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 227     free(name);
 228 #ifdef HAVE_TRACING
 229   TRACE_smpi_ptp_out(rank, src_traced, rank, "wait");
 230   TRACE_smpi_recv(rank, src_traced, rank);
 231 #endif
 232
 233 }
 234
 235 /* FIXME: that's a poor man's implementation: we should take the message exchanges into account */
 236 static void action_barrier(xbt_dynar_t action)
 237 {
 238   char *name = NULL;
 239   static smx_mutex_t mutex = NULL;
 240   static smx_cond_t cond = NULL;
 241   static int processes_arrived_sofar=0;
 242
 243   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 244     name = xbt_str_join(action, " ");
 245
 246   if (mutex == NULL) {       // first arriving on the barrier
 247     mutex = SIMIX_req_mutex_init();
 248     cond = SIMIX_req_cond_init();
 249     processes_arrived_sofar=0;
 250   }
 251   DEBUG2("Entering barrier: %s (%d already there)", name,processes_arrived_sofar);
 252
 253   SIMIX_req_mutex_lock(mutex);
 254   if (++processes_arrived_sofar == communicator_size) {
 255     SIMIX_req_cond_broadcast(cond);
 256     SIMIX_req_mutex_unlock(mutex);
 257   } else {
 258     SIMIX_req_cond_wait(cond,mutex);
 259     SIMIX_req_mutex_unlock(mutex);
 260   }
 261
 262   DEBUG1("Exiting barrier: %s", name);
 263
 264   processes_arrived_sofar--;
 265   if (!processes_arrived_sofar) {
 266     SIMIX_req_cond_destroy(cond);
 267     SIMIX_req_mutex_destroy(mutex);
 268     mutex=NULL;
 269   }
 270
 271   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 272     free(name);
 273
 274 }
 275
 276 static void action_reduce(xbt_dynar_t action)
 277 {
 278         int i;
 279         char *reduce_identifier;
 280         char mailbox[80];
 281         double comm_size = parse_double(xbt_dynar_get_as(action, 2, char *));
 282         double comp_size = parse_double(xbt_dynar_get_as(action, 3, char *));
 283         m_task_t comp_task = NULL;
 284         const char *process_name;
 285         double clock = MSG_get_clock();
 286
 287         process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 288
 289         xbt_assert0(communicator_size, "Size of Communicator is not defined, "
 290                         "can't use collective operations");
 291
 292         process_name = MSG_process_get_name(MSG_process_self());
 293
 294         reduce_identifier = bprintf("reduce_%d", counters->reduce_counter++);
 295
 296         if (!strcmp(process_name, "p0")) {
 297                 DEBUG2("%s: %s is the Root", reduce_identifier, process_name);
 298
 299                 msg_comm_t *comms = xbt_new0(msg_comm_t,communicator_size-1);
 300             m_task_t *tasks = xbt_new0(m_task_t,communicator_size-1);
 301             for (i = 1; i < communicator_size; i++) {
 302               sprintf(mailbox, "%s_p%d_p0", reduce_identifier, i);
 303               comms[i-1] = MSG_task_irecv(&(tasks[i-1]),mailbox);
 304             }
 305             MSG_comm_waitall(comms,communicator_size-1,-1);
 306             for (i = 1; i < communicator_size; i++) {
 307                 MSG_comm_destroy(comms[i-1]);
 308                 MSG_task_destroy(tasks[i-1]);
 309             }
 310             free(tasks);
 311
 312             comp_task = MSG_task_create("reduce_comp", comp_size, 0, NULL);
 313             DEBUG1("%s: computing 'reduce_comp'", reduce_identifier);
 314             MSG_task_execute(comp_task);
 315             MSG_task_destroy(comp_task);
 316             DEBUG1("%s: computed", reduce_identifier);
 317
 318         } else {
 319                 DEBUG2("%s: %s sends", reduce_identifier, process_name);
 320                 sprintf(mailbox, "%s_%s_p0", reduce_identifier, process_name);
 321             DEBUG1("put on %s", mailbox);
 322             MSG_task_send(MSG_task_create(reduce_identifier, 0, comm_size, NULL),
 323                           mailbox);
 324         }
 325
 326         VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 327         free(reduce_identifier);
 328 }
 329
 330 static void action_bcast(xbt_dynar_t action)
 331 {
 332         int i;
 333         char *bcast_identifier;
 334         char mailbox[80];
 335         double comm_size = parse_double(xbt_dynar_get_as(action, 2, char *));
 336         m_task_t task = NULL;
 337         const char *process_name;
 338         double clock = MSG_get_clock();
 339
 340         process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 341
 342         xbt_assert0(communicator_size, "Size of Communicator is not defined, "
 343                         "can't use collective operations");
 344
 345         process_name = MSG_process_get_name(MSG_process_self());
 346
 347         bcast_identifier = bprintf("bcast_%d", counters->bcast_counter++);
 348
 349         if (!strcmp(process_name, "p0")) {
 350                 DEBUG2("%s: %s is the Root", bcast_identifier, process_name);
 351
 352             msg_comm_t *comms = xbt_new0(msg_comm_t,communicator_size-1);
 353
 354             for (i = 1; i < communicator_size; i++) {
 355               sprintf(mailbox, "%s_p0_p%d", bcast_identifier, i);
 356               comms[i-1] =
 357                   MSG_task_isend(MSG_task_create(mailbox,0,comm_size,NULL),
 358                       mailbox);
 359             }
 360             MSG_comm_waitall(comms,communicator_size-1,-1);
 361                 for (i = 1; i < communicator_size; i++)
 362                MSG_comm_destroy(comms[i-1]);
 363             free(comms);
 364
 365             DEBUG2("%s: all messages sent by %s have been received",
 366                    bcast_identifier, process_name);
 367
 368         } else {
 369             sprintf(mailbox, "%s_p0_%s", bcast_identifier, process_name);
 370             MSG_task_receive(&task, mailbox);
 371             MSG_task_destroy(task);
 372             DEBUG2("%s: %s has received", bcast_identifier, process_name);
 373         }
 374
 375         VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 376         free(bcast_identifier);
 377 }
 378
 379
 380 static void action_sleep(xbt_dynar_t action)
 381 {
 382   char *name = NULL;
 383   char *duration = xbt_dynar_get_as(action, 2, char *);
 384   double clock = MSG_get_clock();
 385
 386   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 387     name = xbt_str_join(action, " ");
 388
 389   DEBUG1("Entering %s", name);
 390   MSG_process_sleep(parse_double(duration));
 391   VERB2("%s %f ", name, MSG_get_clock() - clock);
 392
 393   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 394     free(name);
 395 }
 396
 397 static void action_allReduce(xbt_dynar_t action) {
 398   int i;
 399   char *allreduce_identifier;
 400   char mailbox[80];
 401   double comm_size = parse_double(xbt_dynar_get_as(action, 2, char *));
 402   double comp_size = parse_double(xbt_dynar_get_as(action, 3, char *));
 403   m_task_t task = NULL, comp_task = NULL;
 404   const char *process_name;
 405   double clock = MSG_get_clock();
 406
 407   process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 408
 409   xbt_assert0(communicator_size, "Size of Communicator is not defined, "
 410               "can't use collective operations");
 411
 412   process_name = MSG_process_get_name(MSG_process_self());
 413
 414   allreduce_identifier = bprintf("allReduce_%d", counters->allReduce_counter++);
 415
 416   if (!strcmp(process_name, "p0")) {
 417     DEBUG2("%s: %s is the Root", allreduce_identifier, process_name);
 418
 419     msg_comm_t *comms = xbt_new0(msg_comm_t,communicator_size-1);
 420     m_task_t *tasks = xbt_new0(m_task_t,communicator_size-1);
 421     for (i = 1; i < communicator_size; i++) {
 422       sprintf(mailbox, "%s_p%d_p0", allreduce_identifier, i);
 423       comms[i-1] = MSG_task_irecv(&(tasks[i-1]),mailbox);
 424     }
 425     MSG_comm_waitall(comms,communicator_size-1,-1);
 426     for (i = 1; i < communicator_size; i++) {
 427       MSG_comm_destroy(comms[i-1]);
 428       MSG_task_destroy(tasks[i-1]);
 429     }
 430     free(tasks);
 431
 432     comp_task = MSG_task_create("allReduce_comp", comp_size, 0, NULL);
 433     DEBUG1("%s: computing 'reduce_comp'", allreduce_identifier);
 434     MSG_task_execute(comp_task);
 435     MSG_task_destroy(comp_task);
 436     DEBUG1("%s: computed", allreduce_identifier);
 437
 438     for (i = 1; i < communicator_size; i++) {
 439       sprintf(mailbox, "%s_p0_p%d", allreduce_identifier, i);
 440       comms[i-1] =
 441           MSG_task_isend(MSG_task_create(mailbox,0,comm_size,NULL),
 442               mailbox);
 443     }
 444     MSG_comm_waitall(comms,communicator_size-1,-1);
 445     for (i = 1; i < communicator_size; i++)
 446        MSG_comm_destroy(comms[i-1]);
 447     free(comms);
 448
 449     DEBUG2("%s: all messages sent by %s have been received",
 450            allreduce_identifier, process_name);
 451
 452   } else {
 453     DEBUG2("%s: %s sends", allreduce_identifier, process_name);
 454     sprintf(mailbox, "%s_%s_p0", allreduce_identifier, process_name);
 455     DEBUG1("put on %s", mailbox);
 456     MSG_task_send(MSG_task_create(allreduce_identifier, 0, comm_size, NULL),
 457                   mailbox);
 458
 459     sprintf(mailbox, "%s_p0_%s", allreduce_identifier, process_name);
 460     MSG_task_receive(&task, mailbox);
 461     MSG_task_destroy(task);
 462     DEBUG2("%s: %s has received", allreduce_identifier, process_name);
 463   }
 464
 465   VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 466   free(allreduce_identifier);
 467 }
 468
 469 static void action_comm_size(xbt_dynar_t action)
 470 {
 471   char *name = NULL;
 472   char *size = xbt_dynar_get_as(action, 2, char *);
 473   double clock = MSG_get_clock();
 474
 475   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 476     name = xbt_str_join(action, " ");
 477   communicator_size = parse_double(size);
 478   VERB2("%s %f", name, MSG_get_clock() - clock);
 479   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 480     free(name);
 481 }
 482
 483 static void action_compute(xbt_dynar_t action)
 484 {
 485   char *name = NULL;
 486   char *amout = xbt_dynar_get_as(action, 2, char *);
 487   m_task_t task = MSG_task_create(name, parse_double(amout), 0, NULL);
 488   double clock = MSG_get_clock();
 489
 490   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 491     name = xbt_str_join(action, " ");
 492   DEBUG1("Entering %s", name);
 493   MSG_task_execute(task);
 494   MSG_task_destroy(task);
 495   VERB2("%s %f", name, MSG_get_clock() - clock);
 496   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 497     free(name);
 498 }
 499
 500 static void action_init(xbt_dynar_t action)
 501 {
 502 #ifdef HAVE_TRACING
 503   TRACE_smpi_init(get_rank(MSG_process_get_name(MSG_process_self())));
 504 #endif
 505   DEBUG0("Initialize the counters");
 506   process_globals_t globals = (process_globals_t) calloc(1, sizeof(s_process_globals_t));
 507   globals->isends = xbt_dynar_new(sizeof(msg_comm_t),NULL);
 508   globals->irecvs = xbt_dynar_new(sizeof(msg_comm_t),NULL);
 509   globals->tasks  = xbt_dynar_new(sizeof(m_task_t),NULL);
 510   MSG_process_set_data(MSG_process_self(),globals);
 511
 512 }
 513
 514 static void action_finalize(xbt_dynar_t action)
 515 {
 516 #ifdef HAVE_TRACING
 517   TRACE_smpi_finalize(get_rank(MSG_process_get_name(MSG_process_self())));
 518 #endif
 519   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 520   if (globals){
 521     xbt_dynar_free_container(&(globals->isends));
 522     free(globals);
 523   }
 524 }
 525
 526 /** Main function */
 527 int main(int argc, char *argv[])
 528 {
 529   MSG_error_t res = MSG_OK;
 530
 531   /* Check the given arguments */
 532   MSG_global_init(&argc, argv);
 533   if (argc < 3) {
 534     printf("Usage: %s platform_file deployment_file [action_files]\n",
 535            argv[0]);
 536     printf
 537         ("example: %s msg_platform.xml msg_deployment.xml actions # if all actions are in the same file\n",
 538          argv[0]);
 539     printf
 540         ("example: %s msg_platform.xml msg_deployment.xml # if actions are in separate files, specified in deployment\n",
 541          argv[0]);
 542     exit(1);
 543   }
 544
 545   /*  Simulation setting */
 546   MSG_create_environment(argv[1]);
 547
 548   /* No need to register functions as in classical MSG programs: the actions get started anyway */
 549   MSG_launch_application(argv[2]);
 550
 551   /*   Action registration */
 552   MSG_action_register("init",     action_init);
 553   MSG_action_register("finalize", action_finalize);
 554   MSG_action_register("comm_size",action_comm_size);
 555   MSG_action_register("send",     action_send);
 556   MSG_action_register("Isend",    action_Isend);
 557   MSG_action_register("recv",     action_recv);
 558   MSG_action_register("Irecv",    action_Irecv);
 559   MSG_action_register("wait",     action_wait);
 560   MSG_action_register("barrier",  action_barrier);
 561   MSG_action_register("bcast",    action_bcast);
 562   MSG_action_register("reduce",   action_reduce);
 563   MSG_action_register("allReduce",action_allReduce);
 564   MSG_action_register("sleep",    action_sleep);
 565   MSG_action_register("compute",  action_compute);
 566
 567
 568   /* Actually do the simulation using MSG_action_trace_run */
 569   res = MSG_action_trace_run(argv[3]);  // it's ok to pass a NULL argument here
 570
 571   INFO1("Simulation time %g", MSG_get_clock());
 572   MSG_clean();
 573
 574   if (res == MSG_OK)
 575     return 0;
 576   else
 577     return 1;
 578 }                               /* end_of_main */