src/simix/smx_process.c

   1 //*     $Id$     */
   2
   3 /* Copyright (c) 2002,2003,2004 Arnaud Legrand. All rights reserved.        */
   4
   5 /* This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the license (GNU LGPL) which comes with this package. */
   7
   8 #include "private.h"
   9 #include "xbt/sysdep.h"
  10 #include "xbt/log.h"
  11
  12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix,
  13                                 "Logging specific to SIMIX (process)");
  14
  15 /******************************** Process ************************************/
  16 /**
  17  * \brief Creates and runs a new #smx_process_t.
  18  *
  19  * Does exactly the same as #SIMIX_process_create_with_arguments but without
  20    providing standard arguments (\a argc, \a argv).
  21  * \see SIMIX_process_create_with_arguments
  22  */
  23
  24
  25 void SIMIX_process_cleanup(void *arg)
  26 {
  27   xbt_swag_remove(arg, simix_global->process_list);
  28   xbt_swag_remove(arg, simix_global->process_to_run);
  29   xbt_swag_remove(arg, ((smx_process_t) arg)->simdata->s_host->simdata->process_list);
  30   free(((smx_process_t) arg)->name);
  31   ((smx_process_t) arg)->name = NULL;
  32
  33   free(((smx_process_t) arg)->simdata);
  34   ((smx_process_t) arg)->simdata = NULL;
  35   free(arg);
  36 }
  37
  38 /**
  39  * \brief Creates and runs a new #smx_process_t.
  40  *
  41  * A constructor for #m_process_t taking four arguments and returning the corresponding object. The structure (and the corresponding thread) is created, and put in the list of ready process.
  42  *
  43  * \param name a name for the object. It is for user-level information and can be NULL.
  44 * \param data a pointer to any data one may want to attach to the new object.  It is for user-level information and can be NULL. It can be retrieved with the function \ref MSG_process_get_data.
  45  * \param host the location where the new agent is executed.
  46  * \param argc first argument passed to \a code
  47  * \param argv second argument passed to \a code
  48  * \param clean_process_function The cleanup function of user process. It will be called when the process finish. This function have to call the SIMIX_process_cleanup.
  49  * \see smx_process_t
  50  * \return The new corresponding object.
  51  */
  52 smx_process_t SIMIX_process_create(const char *name,
  53                                    xbt_main_func_t code, void *data,
  54                                    const char * hostname, int argc, char **argv)
  55 {
  56   smx_simdata_process_t simdata = xbt_new0(s_smx_simdata_process_t,1);
  57   smx_process_t process = xbt_new0(s_smx_process_t,1);
  58   smx_process_t self = NULL;
  59   smx_host_t host = SIMIX_host_get_by_name(hostname);
  60
  61   xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
  62   /* Simulator Data */
  63
  64   simdata->s_host = host;
  65         simdata->mutex = NULL;
  66         simdata->cond = NULL;
  67   simdata->argc = argc;
  68   simdata->argv = argv;
  69   simdata->context = xbt_context_new(code, NULL, NULL,
  70                                      simix_global->cleanup_process_function, process,
  71                                      simdata->argc, simdata->argv);
  72
  73   /* Process structure */
  74   process->name = xbt_strdup(name);
  75   process->simdata = simdata;
  76   process->data = data;
  77
  78   xbt_swag_insert(process, host->simdata->process_list);
  79
  80   /* fix current_process, about which xbt_context_start mocks around */
  81   self = simix_global->current_process;
  82   xbt_context_start(process->simdata->context);
  83   simix_global->current_process = self;
  84
  85   xbt_swag_insert(process,simix_global->process_list);
  86   DEBUG2("Inserting %s(%s) in the to_run list",process->name,
  87          host->name);
  88   xbt_swag_insert(process,simix_global->process_to_run);
  89
  90   return process;
  91 }
  92
  93 /**
  94  * \brief Creates and runs a new #smx_process_t hosting a JAVA thread
  95  *
  96  * Warning: this should only be used in libsimgrid4java, since it create
  97  * a context with no code, which leads to segfaults in plain libsimgrid
  98  */
  99 void SIMIX_jprocess_create(const char *name, smx_host_t host,
 100                            void *data,
 101                            void *jprocess, void *jenv,
 102                            smx_process_t *res)
 103 {
 104   smx_simdata_process_t simdata = xbt_new0(s_smx_simdata_process_t,1);
 105   smx_process_t process = xbt_new0(s_smx_process_t,1);
 106   smx_process_t self = NULL;
 107
 108   /* HACK: We need this trick because when we xbt_context_new() do
 109      syncronization stuff, the s_process field in the m_process needs
 110      to have a valid value, and we call xbt_context_new() before
 111      returning, of course, ie, before providing a right value to the
 112      caller (Java_simgrid_msg_Msg_processCreate) have time to store it
 113      in place. This way, we initialize the m_process->simdata->s_process
 114      field ourself ASAP.
 115
 116      All this would be much simpler if the synchronization stuff would be done
 117      in the JAVA world, I think.
 118   */
 119   *res= process;
 120
 121
 122
 123   DEBUG5("jprocess_create(name=%s,host=%p,data=%p,jproc=%p,jenv=%p)",
 124          name,host,data,jprocess,jenv);
 125   xbt_assert0(host, "Invalid parameters");
 126   /* Simulator Data */
 127   simdata->s_host = host;
 128   simdata->mutex = NULL;
 129   simdata->cond = NULL;
 130   simdata->argc = 0;
 131   simdata->argv = NULL;
 132
 133   simdata->context = xbt_context_new(NULL, NULL, NULL,
 134                                      simix_global->cleanup_process_function, process,
 135                                      /* argc/argv*/0,NULL);
 136
 137   /* Process structure */
 138   process->name = xbt_strdup(name);
 139   process->simdata = simdata;
 140   process->data = data;
 141   SIMIX_process_set_jprocess(process,jprocess);
 142   SIMIX_process_set_jenv(process,jenv);
 143
 144   xbt_swag_insert(process, host->simdata->process_list);
 145
 146   /* fix current_process, about which xbt_context_start mocks around */
 147   self = simix_global->current_process;
 148   xbt_context_start(process->simdata->context);
 149   simix_global->current_process = self;
 150
 151   xbt_swag_insert(process,simix_global->process_list);
 152   DEBUG2("Inserting %s(%s) in the to_run list",process->name,
 153          host->name);
 154   xbt_swag_insert(process,simix_global->process_to_run);
 155
 156 }
 157
 158
 159 /** \brief Kill a SIMIX process
 160  *
 161  * This function simply kills a \a process... scarry isn't it ? :).
 162  * \param process poor victim
 163  *
 164  */
 165 void SIMIX_process_kill(smx_process_t process)
 166 {
 167    smx_simdata_process_t p_simdata = process->simdata;
 168
 169    DEBUG2("Killing process %s on %s",process->name, p_simdata->s_host->name);
 170
 171    /* Cleanup if we were waiting for something */
 172    DEBUG0("Here!");
 173    if (p_simdata->mutex)
 174       xbt_swag_remove(process,p_simdata->mutex->sleeping);
 175
 176    DEBUG0("Here!");
 177    if (p_simdata->cond)
 178       xbt_swag_remove(process,p_simdata->cond->sleeping);
 179
 180    DEBUG0("Here!");
 181    xbt_swag_remove(process, simix_global->process_to_run);
 182    DEBUG0("Here!");
 183    xbt_swag_remove(process, simix_global->process_list);
 184    DEBUG2("%p here! killing %p",simix_global->current_process,process);
 185    xbt_context_kill(process->simdata->context);
 186
 187    DEBUG0("Here!");
 188    if(process==SIMIX_process_self()) {
 189       /* I just killed myself */
 190      DEBUG0("Here!");
 191       xbt_context_yield();
 192    }
 193    DEBUG0("Here!");
 194 }
 195
 196 /**
 197  * \brief Return the user data of a #smx_process_t.
 198  *
 199  * This functions checks whether \a process is a valid pointer or not and return the user data associated to \a process if it is possible.
 200  * \param process SIMIX process
 201  * \return A void pointer to the user data
 202  */
 203 void *SIMIX_process_get_data(smx_process_t process)
 204 {
 205   xbt_assert0((process != NULL), "Invalid parameters");
 206
 207   return (process->data);
 208 }
 209
 210 /**
 211  * \brief Set the user data of a #m_process_t.
 212  *
 213  * This functions checks whether \a process is a valid pointer or not and set the user data associated to \a process if it is possible.
 214  * \param process SIMIX process
 215  * \param data User data
 216  */
 217 void SIMIX_process_set_data(smx_process_t process,void *data)
 218 {
 219   xbt_assert0((process != NULL), "Invalid parameters");
 220   //xbt_assert0((process->data == NULL), "Data already set");
 221
 222   process->data = data;
 223
 224   return ;
 225 }
 226
 227 /**
 228  * \brief Return the location on which an agent is running.
 229  *
 230  * This functions checks whether \a process is a valid pointer or not and return the m_host_t corresponding to the location on which \a process is running.
 231  * \param process SIMIX process
 232  * \return SIMIX host
 233  */
 234 smx_host_t SIMIX_process_get_host(smx_process_t process)
 235 {
 236   xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
 237
 238   return (process->simdata->s_host);
 239 }
 240
 241 /**
 242  * \brief Return the name of an agent.
 243  *
 244  * This functions checks whether \a process is a valid pointer or not and return its name.
 245  * \param process SIMIX process
 246  * \return The process name
 247  */
 248 const char *SIMIX_process_get_name(smx_process_t process)
 249 {
 250   xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
 251
 252   return (process->name);
 253 }
 254
 255 /**
 256  * \brief Return the current agent.
 257  *
 258  * This functions returns the currently running #smx_process_t.
 259  * \return The SIMIX process
 260  */
 261 smx_process_t SIMIX_process_self(void)
 262 {
 263   return simix_global ? simix_global->current_process : NULL;
 264 }
 265
 266 /**
 267  * \brief Suspend the process.
 268  *
 269  * This functions suspend the process by suspending the action on which it was waiting for the completion.
 270  *      \param process SIMIX process
 271  */
 272 void SIMIX_process_suspend(smx_process_t process)
 273 {
 274   smx_simdata_process_t simdata = NULL;
 275
 276   xbt_assert0(((process) && (process->simdata)), "Invalid parameters");
 277
 278   if(process!=SIMIX_process_self()) {
 279     simdata = process->simdata;
 280
 281                 if (simdata->mutex) {
 282                         /* process blocked on a mutex, only set suspend=1 */
 283                         simdata->suspended = 1;
 284                 }
 285                 else if (simdata->cond){
 286                         /* process blocked cond, suspend all actions */
 287
 288                         /* temporaries variables */
 289                         smx_cond_t c;
 290                         xbt_fifo_item_t i;
 291                         smx_action_t act;
 292
 293                         simdata->suspended = 1;
 294                         c = simdata->cond;
 295                         xbt_fifo_foreach(c->actions,i,act, smx_action_t) {
 296                                 surf_workstation_resource->common_public->suspend(act->simdata->surf_action);
 297                         }
 298                 }
 299                 else {
 300                         simdata->suspended = 1;
 301                 }
 302   }
 303         else {
 304                 /* process executing, I can create an action and suspend it */
 305                 process->simdata->suspended = 1;
 306                 smx_action_t dummy;
 307                 smx_cond_t cond;
 308                 char name[] = "dummy";
 309
 310                 cond = SIMIX_cond_init();
 311                 dummy = SIMIX_action_execute(SIMIX_process_get_host(process), name, 0);
 312                 surf_workstation_resource->common_public->set_priority(dummy->simdata->surf_action,0.0);
 313                 SIMIX_register_condition_to_action(dummy,cond);
 314                 SIMIX_register_action_to_condition(dummy,cond);
 315                 __SIMIX_cond_wait(cond);
 316                 //SIMIX_action_destroy(dummy);
 317                 //SIMIX_cond_destroy(cond);
 318         }
 319   return ;
 320 }
 321
 322 /**
 323  * \brief Resume a suspended process.
 324  *
 325  * This functions resume a suspended process by resuming the task on which it was waiting for the completion.
 326  * \param process SIMIX process
 327  */
 328 void SIMIX_process_resume(smx_process_t process)
 329 {
 330   smx_simdata_process_t simdata = NULL;
 331
 332   xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
 333   SIMIX_CHECK_HOST();
 334
 335   if(process == SIMIX_process_self()) {
 336                 return;
 337   }
 338
 339   simdata = process->simdata;
 340   if(simdata->mutex) {
 341                 DEBUG0("Resume process blocked on a mutex");
 342     simdata->suspended = 0; /* He'll wake up by itself */
 343                 return;
 344   }
 345         else if (simdata->cond) {
 346                 DEBUG0("Resume process blocked on a conditional");
 347                 /* temporaries variables */
 348                 smx_cond_t c;
 349                 xbt_fifo_item_t i;
 350                 smx_action_t act;
 351                 simdata->suspended = 0;
 352                 c = simdata->cond;
 353                 xbt_fifo_foreach(c->actions,i,act, smx_action_t) {
 354                         surf_workstation_resource->common_public->resume(act->simdata->surf_action);
 355                 }
 356                 return;
 357         }
 358         else {
 359                 simdata->suspended = 0;
 360                 xbt_swag_insert(process,simix_global->process_to_run);
 361         }
 362
 363 }
 364
 365 /**
 366  * \brief Returns true if the process is suspended .
 367  *
 368  * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
 369  * \param process SIMIX process
 370  * \return 1, if the process is suspended, else 0.
 371  */
 372 int SIMIX_process_is_suspended(smx_process_t process)
 373 {
 374   xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
 375
 376   return (process->simdata->suspended);
 377 }
 378
 379
 380 /* Helper functions for jMSG: manipulate the context data without breaking the module separation */
 381 #include "xbt/context.h" /* to pass java objects from MSG to the context */
 382
 383 void SIMIX_process_set_jprocess(smx_process_t process, void *jp) {
 384    xbt_context_set_jprocess(process->simdata->context,jp);
 385 }
 386 void* SIMIX_process_get_jprocess(smx_process_t process) {
 387    return xbt_context_get_jprocess(process->simdata->context);
 388 }
 389
 390 void SIMIX_process_set_jmutex(smx_process_t process, void *jm) {
 391    xbt_context_set_jmutex(process->simdata->context,jm);
 392 }
 393 void* SIMIX_process_get_jmutex(smx_process_t process) {
 394    return xbt_context_get_jmutex(process->simdata->context);
 395 }
 396
 397 void SIMIX_process_set_jcond(smx_process_t process, void *jc) {
 398    xbt_context_set_jcond(process->simdata->context,jc);
 399 }
 400 void* SIMIX_process_get_jcond(smx_process_t process) {
 401    return xbt_context_get_jcond(process->simdata->context);
 402 }
 403
 404 void SIMIX_process_set_jenv(smx_process_t process, void *je) {
 405    xbt_context_set_jenv(process->simdata->context,je);
 406 }
 407 void* SIMIX_process_get_jenv(smx_process_t process) {
 408    return xbt_context_get_jenv(process->simdata->context);
 409 }
 410