src/bindings/java/jmsg_process.cpp

   1 /* Functions related to the java process instances.                         */
   2
   3 /* Copyright (c) 2007-2015. The SimGrid Team.
   4  * All rights reserved.                                                     */
   5
   6 /* This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the license (GNU LGPL) which comes with this package. */
   8
   9 #include "jmsg_process.h"
  10
  11 #include "jmsg.h"
  12 #include "jmsg_host.h"
  13 #include "jxbt_utilities.h"
  14 #include "JavaContext.hpp"
  15
  16 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(jmsg);
  17
  18 extern "C" {
  19
  20 jfieldID jprocess_field_Process_bind;
  21 jfieldID jprocess_field_Process_host;
  22 jfieldID jprocess_field_Process_killTime;
  23 jfieldID jprocess_field_Process_id;
  24 jfieldID jprocess_field_Process_name;
  25 jfieldID jprocess_field_Process_pid;
  26 jfieldID jprocess_field_Process_ppid;
  27
  28 JNIEXPORT void JNICALL
  29 Java_org_simgrid_msg_Process_exit(JNIEnv *env, jobject jprocess) {
  30
  31 }
  32
  33 jobject native_to_java_process(msg_process_t process)
  34 {
  35   simgrid::java::JavaContext* context =
  36     (simgrid::java::JavaContext*) MSG_process_get_smx_ctx(process);
  37   return context->jprocess;
  38 }
  39
  40 jobject jprocess_new_global_ref(jobject jprocess, JNIEnv * env)
  41 {
  42   return env->NewGlobalRef(jprocess);
  43 }
  44
  45 void jprocess_delete_global_ref(jobject jprocess, JNIEnv * env)
  46 {
  47   env->DeleteGlobalRef(jprocess);
  48 }
  49
  50 void jprocess_join(jobject jprocess, JNIEnv * env)
  51 {
  52         msg_process_t process = jprocess_to_native_process(jprocess,env);
  53         simgrid::java::JavaContext* context =
  54     (simgrid::java::JavaContext*) MSG_process_get_smx_ctx(process);
  55         xbt_os_thread_join(context->thread,NULL);
  56 }
  57
  58 msg_process_t jprocess_to_native_process(jobject jprocess, JNIEnv * env)
  59 {
  60   return
  61     (msg_process_t)(intptr_t)env->GetLongField(jprocess,
  62                                                   jprocess_field_Process_bind);
  63 }
  64
  65 void jprocess_bind(jobject jprocess, msg_process_t process, JNIEnv * env)
  66 {
  67   env->SetLongField(jprocess, jprocess_field_Process_bind,
  68                        (intptr_t)process);
  69 }
  70
  71 jlong jprocess_get_id(jobject jprocess, JNIEnv * env)
  72 {
  73   return
  74     (intptr_t)env->GetLongField(jprocess, jprocess_field_Process_id);
  75 }
  76
  77 jstring jprocess_get_name(jobject jprocess, JNIEnv * env)
  78 {
  79   jstring jname = (jstring) env->GetObjectField(jprocess, jprocess_field_Process_name);
  80   return (jstring) env->NewGlobalRef(jname);
  81 }
  82
  83 jboolean jprocess_is_valid(jobject jprocess, JNIEnv * env)
  84 {
  85   jfieldID id = jxbt_get_sfield(env, "org/simgrid/msg/Process", "bind", "J");
  86
  87   if (!id)
  88     return JNI_FALSE;
  89
  90   return env->GetLongField(jprocess, id) ? JNI_TRUE : JNI_FALSE;
  91 }
  92 JNIEXPORT void JNICALL
  93 Java_org_simgrid_msg_Process_nativeInit(JNIEnv *env, jclass cls) {
  94   jclass jprocess_class_Process = env->FindClass("org/simgrid/msg/Process");
  95
  96   jprocess_field_Process_name = jxbt_get_jfield(env, jprocess_class_Process, "name", "Ljava/lang/String;");
  97   jprocess_field_Process_bind = jxbt_get_jfield(env, jprocess_class_Process, "bind", "J");
  98   jprocess_field_Process_id = jxbt_get_jfield(env, jprocess_class_Process, "id", "J");
  99   jprocess_field_Process_pid = jxbt_get_jfield(env, jprocess_class_Process, "pid", "I");
 100   jprocess_field_Process_ppid = jxbt_get_jfield(env, jprocess_class_Process, "ppid", "I");
 101   jprocess_field_Process_host = jxbt_get_jfield(env, jprocess_class_Process, "host", "Lorg/simgrid/msg/Host;");
 102   jprocess_field_Process_killTime = jxbt_get_jfield(env, jprocess_class_Process, "killTime", "D");
 103   if (!jprocess_class_Process || !jprocess_field_Process_id || !jprocess_field_Process_name || !jprocess_field_Process_pid ||
 104       !jprocess_field_Process_ppid || !jprocess_field_Process_host) {
 105     jxbt_throw_native(env,bprintf("Can't find some fields in Java class. You should report this bug."));
 106   }
 107 }
 108
 109 JNIEXPORT void JNICALL
 110 Java_org_simgrid_msg_Process_create(JNIEnv * env,
 111                                     jobject jprocess_arg,
 112                                     jobject jhostname)
 113 {
 114
 115
 116   jobject jprocess;             /* the global reference to the java process instance    */
 117   jstring jname;                /* the name of the java process instance                */
 118   const char *name;             /* the C name of the process                            */
 119   const char *hostname;
 120   msg_process_t process;          /* the native process to create                         */
 121   msg_host_t host;                /* Where that process lives */
 122
 123   hostname = env->GetStringUTFChars((jstring) jhostname, 0);
 124
 125   /* get the name of the java process */
 126   jname = jprocess_get_name(jprocess_arg, env);
 127   if (!jname) {
 128     jxbt_throw_null(env,
 129             xbt_strdup("Internal error: Process name cannot be NULL"));
 130     return;
 131   }
 132
 133   /* bind/retrieve the msg host */
 134   host = MSG_host_by_name(hostname);
 135
 136   if (!(host)) {    /* not bound */
 137     jxbt_throw_host_not_found(env, hostname);
 138     return;
 139   }
 140
 141   /* create a global java process instance */
 142   jprocess = jprocess_new_global_ref(jprocess_arg, env);
 143   if (!jprocess) {
 144     jxbt_throw_jni(env, "Can't get a global ref to the java process");
 145     return;
 146   }
 147
 148   /* build the C name of the process */
 149   name = env->GetStringUTFChars(jname, 0);
 150   name = xbt_strdup(name);
 151
 152   /* Retrieve the kill time from the process */
 153   jdouble jkill = env->GetDoubleField(jprocess, jprocess_field_Process_killTime);
 154   /* Actually build the MSG process */
 155   process = MSG_process_create_with_environment(name,
 156             [](int argc, char** argv) -> int {
 157               smx_process_t process = SIMIX_process_self();
 158               // This is the jprocess passed as environment.
 159               // It would be simplet if we could use a closure.
 160               jobject jprocess = (jobject) MSG_process_get_data(process);
 161               simgrid::java::java_main_jprocess(jprocess);
 162               return 0;
 163             }, jprocess,
 164                                                 host,
 165                                                 /*argc, argv, properties*/
 166                                                 0, NULL, NULL);
 167   MSG_process_set_kill_time(process, (double)jkill);
 168   /* bind the java process instance to the native process */
 169   jprocess_bind(jprocess, process, env);
 170
 171   /* release our reference to the process name (variable name becomes invalid) */
 172   //FIXME : This line should be uncommented but with mac it doesn't work. BIG WARNING
 173   //env->ReleaseStringUTFChars(jname, name);
 174   env->ReleaseStringUTFChars((jstring) jhostname, hostname);
 175
 176   /* sets the PID and the PPID of the process */
 177   env->SetIntField(jprocess, jprocess_field_Process_pid,(jint) MSG_process_get_PID(process));
 178   env->SetIntField(jprocess, jprocess_field_Process_ppid, (jint) MSG_process_get_PPID(process));
 179   /* sets the Host of the process */
 180   jobject jhost = Java_org_simgrid_msg_Host_getByName(env,NULL, (jstring)jhostname);
 181
 182   env->SetObjectField(jprocess, jprocess_field_Process_host, jhost);
 183 }
 184
 185 JNIEXPORT jint JNICALL
 186 Java_org_simgrid_msg_Process_killAll(JNIEnv * env, jclass cls,
 187                                      jint jresetPID)
 188 {
 189   return (jint) MSG_process_killall((int) jresetPID);
 190 }
 191
 192 JNIEXPORT jobject JNICALL
 193 Java_org_simgrid_msg_Process_fromPID(JNIEnv * env, jclass cls,
 194                                      jint PID)
 195 {
 196   msg_process_t process = MSG_process_from_PID(PID);
 197
 198   if (!process) {
 199     jxbt_throw_process_not_found(env, bprintf("PID = %d",(int) PID));
 200     return NULL;
 201   }
 202
 203   jobject jprocess = native_to_java_process(process);
 204
 205   if (!jprocess) {
 206     jxbt_throw_jni(env, "get process failed");
 207     return NULL;
 208   }
 209
 210   return jprocess;
 211 }
 212 JNIEXPORT jobject JNICALL
 213 Java_org_simgrid_msg_Process_getProperty(JNIEnv *env, jobject jprocess, jobject jname) {
 214   msg_process_t process = jprocess_to_native_process(jprocess, env);
 215
 216   if (!process) {
 217     jxbt_throw_notbound(env, "process", jprocess);
 218     return NULL;
 219   }
 220   const char *name = env->GetStringUTFChars((jstring)jname, 0);
 221
 222   const char *property = MSG_process_get_property_value(process, name);
 223   if (!property) {
 224     return NULL;
 225   }
 226
 227   jobject jproperty = env->NewStringUTF(property);
 228
 229   env->ReleaseStringUTFChars((jstring)jname, name);
 230
 231   return jproperty;
 232 }
 233 JNIEXPORT jobject JNICALL
 234 Java_org_simgrid_msg_Process_getCurrentProcess(JNIEnv * env, jclass cls)
 235 {
 236   msg_process_t process = MSG_process_self();
 237   jobject jprocess;
 238
 239   if (!process) {
 240     jxbt_throw_jni(env, xbt_strdup("MSG_process_self() failed"));
 241     return NULL;
 242   }
 243
 244   jprocess = native_to_java_process(process);
 245
 246   if (!jprocess)
 247     jxbt_throw_jni(env, xbt_strdup("SIMIX_process_get_jprocess() failed"));
 248
 249   return jprocess;
 250 }
 251
 252 JNIEXPORT void JNICALL
 253 Java_org_simgrid_msg_Process_suspend(JNIEnv * env,
 254                                    jobject jprocess)
 255 {
 256   msg_process_t process = jprocess_to_native_process(jprocess, env);
 257
 258   if (!process) {
 259     jxbt_throw_notbound(env, "process", jprocess);
 260     return;
 261   }
 262
 263   /* try to suspend the process */
 264   msg_error_t rv = MSG_process_suspend(process);
 265
 266   jxbt_check_res("MSG_process_suspend()", rv, MSG_OK,
 267                  bprintf("unexpected error , please report this bug"));
 268
 269 }
 270
 271 JNIEXPORT void JNICALL
 272 Java_org_simgrid_msg_Process_resume(JNIEnv * env,
 273                                      jobject jprocess)
 274 {
 275   msg_process_t process = jprocess_to_native_process(jprocess, env);
 276
 277   if (!process) {
 278     jxbt_throw_notbound(env, "process", jprocess);
 279     return;
 280   }
 281
 282   /* try to resume the process */
 283   msg_error_t rv = MSG_process_resume(process);
 284
 285   jxbt_check_res("MSG_process_resume()", rv, MSG_OK,
 286                  bprintf("unexpected error , please report this bug"));
 287 }
 288 JNIEXPORT void JNICALL
 289 Java_org_simgrid_msg_Process_setAutoRestart
 290     (JNIEnv *env, jobject jprocess, jboolean jauto_restart) {
 291   msg_process_t process = jprocess_to_native_process(jprocess, env);
 292   xbt_ex_t e;
 293
 294   int auto_restart = jauto_restart == JNI_TRUE ? 1 : 0;
 295
 296   if (!process) {
 297     jxbt_throw_notbound(env, "process", jprocess);
 298     return;
 299   }
 300
 301   TRY {
 302     MSG_process_auto_restart_set(process,auto_restart);
 303   }
 304   CATCH (e) {
 305     xbt_ex_free(e);
 306   }
 307 }
 308 JNIEXPORT void JNICALL
 309 Java_org_simgrid_msg_Process_restart
 310     (JNIEnv *env, jobject jprocess) {
 311   msg_process_t process = jprocess_to_native_process(jprocess, env);
 312   xbt_ex_t e;
 313
 314   if (!process) {
 315     jxbt_throw_notbound(env, "process", jprocess);
 316     return;
 317   }
 318
 319   TRY {
 320     MSG_process_restart(process);
 321   }
 322   CATCH (e) {
 323     xbt_ex_free(e);
 324   }
 325
 326 }
 327 JNIEXPORT jboolean JNICALL
 328 Java_org_simgrid_msg_Process_isSuspended(JNIEnv * env,
 329                                          jobject jprocess)
 330 {
 331   msg_process_t process = jprocess_to_native_process(jprocess, env);
 332
 333   if (!process) {
 334     jxbt_throw_notbound(env, "process", jprocess);
 335     return 0;
 336   }
 337
 338   /* true is the process is suspended, false otherwise */
 339   return (jboolean) MSG_process_is_suspended(process);
 340 }
 341
 342 JNIEXPORT void JNICALL
 343 Java_org_simgrid_msg_Process_sleep(JNIEnv *env, jclass cls, jlong jmillis, jint jnanos)
 344  {
 345   double time =  ((double)jmillis) / 1000 + ((double)jnanos) / 1000000000;
 346   msg_error_t rv;
 347   rv = MSG_process_sleep(time);
 348   if (rv != MSG_OK) {
 349     XBT_DEBUG("Something during the MSG_process_sleep invocation was wrong, trigger a HostFailureException");
 350
 351     //jmsg_throw_status(env,rv);
 352
 353     // adsein, the code above as been replaced by the code below. Indeed, according to the documentation, a sleep can only
 354     // trigger a host_failure exception. When the sleep crashes due to a host shutdown, the exception thrown by smx_context_java.c
 355     // is a cancelled_error, see bindings/java/smx_context_java.c, function void smx_ctx_java_stop(smx_context_t context) and src/msg/msg_gos.c
 356     // function  msg_error_t MSG_process_sleep(double nb_sec)
 357
 358     jxbt_throw_host_failure(env,NULL);
 359   }
 360 }
 361 JNIEXPORT void JNICALL
 362 Java_org_simgrid_msg_Process_waitFor(JNIEnv * env, jobject jprocess,
 363                                      jdouble jseconds)
 364 {
 365   msg_error_t rv;
 366   rv = MSG_process_sleep((double)jseconds);
 367   if (env->ExceptionOccurred())
 368     return;
 369   if (rv != MSG_OK) {
 370     XBT_DEBUG("Status NOK");
 371     jmsg_throw_status(env,rv);
 372   }
 373 }
 374
 375 JNIEXPORT void JNICALL
 376 Java_org_simgrid_msg_Process_kill(JNIEnv * env,
 377                                   jobject jprocess)
 378 {
 379         /* get the native instances from the java ones */
 380   msg_process_t process = jprocess_to_native_process(jprocess, env);
 381   if (!process) {
 382     jxbt_throw_notbound(env, "process", jprocess);
 383     return;
 384   }
 385
 386         MSG_process_kill(process);
 387 }
 388 JNIEXPORT void JNICALL
 389 Java_org_simgrid_msg_Process_migrate(JNIEnv * env,
 390                                      jobject jprocess, jobject jhost)
 391 {
 392   msg_process_t process = jprocess_to_native_process(jprocess, env);
 393
 394   if (!process) {
 395     jxbt_throw_notbound(env, "process", jprocess);
 396     return;
 397   }
 398
 399   msg_host_t host = jhost_get_native(env, jhost);
 400
 401   if (!host) {
 402     jxbt_throw_notbound(env, "host", jhost);
 403     return;
 404   }
 405
 406   /* try to change the host of the process */
 407   msg_error_t rv = MSG_process_migrate(process, host);
 408   if (rv != MSG_OK) {
 409     jmsg_throw_status(env,rv);
 410     return;
 411   }
 412   /* change the host java side */
 413   env->SetObjectField(jprocess, jprocess_field_Process_host, jhost);
 414 }
 415 JNIEXPORT void JNICALL
 416 Java_org_simgrid_msg_Process_setKillTime (JNIEnv *env , jobject jprocess, jdouble jkilltime) {
 417         msg_process_t process = jprocess_to_native_process(jprocess, env);
 418         MSG_process_set_kill_time(process, (double)jkilltime);
 419 }
 420
 421 JNIEXPORT jint JNICALL
 422 Java_org_simgrid_msg_Process_getCount(JNIEnv * env, jclass cls) {
 423   return (jint) MSG_process_get_number();
 424 }
 425
 426 }