src/bindings/java/jmsg_process.cpp

   1 /* Functions related to the java process instances.                         */
   2
   3 /* Copyright (c) 2007-2021. The SimGrid Team. 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 "jmsg_process.h"
   9
  10 #include "JavaContext.hpp"
  11 #include "jmsg.hpp"
  12 #include "jmsg_host.h"
  13 #include "jxbt_utilities.hpp"
  14 #include "simgrid/Exception.hpp"
  15
  16 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(java);
  17
  18 jfieldID jprocess_field_Process_bind;
  19 jfieldID jprocess_field_Process_host;
  20 jfieldID jprocess_field_Process_killTime;
  21 jfieldID jprocess_field_Process_name;
  22 jfieldID jprocess_field_Process_pid;
  23 jfieldID jprocess_field_Process_ppid;
  24
  25 jobject jprocess_from_native(const_sg_actor_t actor)
  26 {
  27   const simgrid::kernel::context::JavaContext* context =
  28       static_cast<simgrid::kernel::context::JavaContext*>(actor->get_impl()->context_.get());
  29   return context->jprocess_;
  30 }
  31
  32 jobject jprocess_ref(jobject jprocess, JNIEnv* env)
  33 {
  34   return env->NewGlobalRef(jprocess);
  35 }
  36
  37 void jprocess_unref(jobject jprocess, JNIEnv* env)
  38 {
  39   env->DeleteGlobalRef(jprocess);
  40 }
  41
  42 sg_actor_t jprocess_to_native(jobject jprocess, JNIEnv* env)
  43 {
  44   return (sg_actor_t)(intptr_t)env->GetLongField(jprocess, jprocess_field_Process_bind);
  45 }
  46
  47 void jprocess_bind(jobject jprocess, const_sg_actor_t actor, JNIEnv* env)
  48 {
  49   env->SetLongField(jprocess, jprocess_field_Process_bind, (intptr_t)actor);
  50 }
  51
  52 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_nativeInit(JNIEnv *env, jclass cls) {
  53   jclass jprocess_class_Process = env->FindClass("org/simgrid/msg/Process");
  54   xbt_assert(jprocess_class_Process, "Native initialization of msg/Process failed. Please report that bug");
  55
  56   jprocess_field_Process_name = jxbt_get_jfield(env, jprocess_class_Process, "name", "Ljava/lang/String;");
  57   jprocess_field_Process_bind = jxbt_get_jfield(env, jprocess_class_Process, "bind", "J");
  58   jprocess_field_Process_pid = jxbt_get_jfield(env, jprocess_class_Process, "pid", "I");
  59   jprocess_field_Process_ppid = jxbt_get_jfield(env, jprocess_class_Process, "ppid", "I");
  60   jprocess_field_Process_host = jxbt_get_jfield(env, jprocess_class_Process, "host", "Lorg/simgrid/msg/Host;");
  61   jprocess_field_Process_killTime = jxbt_get_jfield(env, jprocess_class_Process, "killTime", "D");
  62   xbt_assert(jprocess_field_Process_name && jprocess_field_Process_pid && jprocess_field_Process_ppid &&
  63                  jprocess_field_Process_host,
  64              "Native initialization of msg/Process failed. Please report that bug");
  65 }
  66
  67 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_create(JNIEnv* env, jobject jprocess_arg, jobject jhost)
  68 {
  69   /* create a global java process instance */
  70   jobject jprocess = jprocess_ref(jprocess_arg, env);
  71
  72   /* Actually build the MSG process */
  73   auto jname        = (jstring)env->GetObjectField(jprocess, jprocess_field_Process_name);
  74   const char* name  = env->GetStringUTFChars(jname, nullptr);
  75   auto actor_code   = [jprocess]() { simgrid::kernel::context::java_main_jprocess(jprocess); };
  76   smx_actor_t self  = SIMIX_process_self();
  77   sg_host_t host    = jhost_get_native(env, jhost);
  78   smx_actor_t actor = simgrid::kernel::actor::simcall([name, actor_code, host, self] {
  79     return simgrid::kernel::actor::ActorImpl::create(std::move(name), std::move(actor_code), nullptr, host, self).get();
  80   });
  81   sg_actor_yield();
  82
  83   env->ReleaseStringUTFChars(jname, name);
  84
  85   /* Retrieve the kill time from the actor */
  86   actor->get_ciface()->set_kill_time((double)env->GetDoubleField(jprocess, jprocess_field_Process_killTime));
  87
  88   /* sets the PID and the PPID of the actor */
  89   env->SetIntField(jprocess, jprocess_field_Process_pid, (jint)actor->get_ciface()->get_pid());
  90   env->SetIntField(jprocess, jprocess_field_Process_ppid, (jint)actor->get_ciface()->get_ppid());
  91 }
  92
  93 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_daemonize(JNIEnv* env, jobject jprocess)
  94 {
  95   sg_actor_t actor = jprocess_to_native(jprocess, env);
  96
  97   if (not actor) {
  98     jxbt_throw_notbound(env, "process", jprocess);
  99     return;
 100   }
 101
 102   actor->daemonize();
 103 }
 104
 105 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_killAll(JNIEnv* env, jclass cls)
 106 {
 107   sg_actor_kill_all();
 108 }
 109
 110 JNIEXPORT jobject JNICALL Java_org_simgrid_msg_Process_fromPID(JNIEnv * env, jclass cls, jint pid)
 111 {
 112   auto const* actor = sg_actor_by_pid(pid);
 113
 114   if (not actor) {
 115     jxbt_throw_process_not_found(env, std::string("PID = ") + std::to_string(static_cast<int>(pid)));
 116     return nullptr;
 117   }
 118
 119   jobject jprocess = jprocess_from_native(actor);
 120
 121   if (not jprocess) {
 122     jxbt_throw_jni(env, "get process failed");
 123     return nullptr;
 124   }
 125
 126   return jprocess;
 127 }
 128
 129 JNIEXPORT jint JNICALL Java_org_simgrid_msg_Process_nativeGetPID(JNIEnv* env, jobject jprocess)
 130 {
 131   const_sg_actor_t actor = jprocess_to_native(jprocess, env);
 132   return sg_actor_get_pid(actor);
 133 }
 134
 135 JNIEXPORT jobject JNICALL Java_org_simgrid_msg_Process_getProperty(JNIEnv *env, jobject jprocess, jobject jname) {
 136   const_sg_actor_t actor = jprocess_to_native(jprocess, env);
 137
 138   if (not actor) {
 139     jxbt_throw_notbound(env, "process", jprocess);
 140     return nullptr;
 141   }
 142   const char* name = env->GetStringUTFChars((jstring)jname, nullptr);
 143
 144   const char* property = actor->get_property(name);
 145   if (not property)
 146     return nullptr;
 147
 148   jobject jproperty = env->NewStringUTF(property);
 149
 150   env->ReleaseStringUTFChars((jstring)jname, name);
 151
 152   return jproperty;
 153 }
 154
 155 JNIEXPORT jobject JNICALL Java_org_simgrid_msg_Process_getCurrentProcess(JNIEnv * env, jclass cls)
 156 {
 157   jobject jprocess = jprocess_from_native(sg_actor_self());
 158   if (not jprocess)
 159     jxbt_throw_jni(env, xbt_strdup("SIMIX_process_get_jprocess() failed"));
 160
 161   return jprocess;
 162 }
 163
 164 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_suspend(JNIEnv * env, jobject jprocess)
 165 {
 166   sg_actor_t actor = jprocess_to_native(jprocess, env);
 167
 168   if (not actor) {
 169     jxbt_throw_notbound(env, "process", jprocess);
 170     return;
 171   }
 172
 173   /* suspend the process */
 174   actor->suspend();
 175 }
 176
 177 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_resume(JNIEnv * env, jobject jprocess)
 178 {
 179   sg_actor_t actor = jprocess_to_native(jprocess, env);
 180
 181   if (not actor) {
 182     jxbt_throw_notbound(env, "process", jprocess);
 183     return;
 184   }
 185
 186   /* resume the process */
 187   actor->resume();
 188 }
 189
 190 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_setAutoRestart(JNIEnv* env, jobject jprocess,
 191                                                                    jboolean jauto_restart)
 192 {
 193   sg_actor_t actor = jprocess_to_native(jprocess, env);
 194   if (not actor) {
 195     jxbt_throw_notbound(env, "process", jprocess);
 196     return;
 197   }
 198
 199   actor->set_auto_restart(jauto_restart == JNI_TRUE);
 200 }
 201
 202 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_restart (JNIEnv *env, jobject jprocess) {
 203   sg_actor_t actor = jprocess_to_native(jprocess, env);
 204
 205   if (not actor) {
 206     jxbt_throw_notbound(env, "process", jprocess);
 207     return;
 208   }
 209
 210   actor->restart();
 211 }
 212
 213 JNIEXPORT jboolean JNICALL Java_org_simgrid_msg_Process_isSuspended(JNIEnv * env, jobject jprocess)
 214 {
 215   sg_actor_t actor = jprocess_to_native(jprocess, env);
 216
 217   if (not actor) {
 218     jxbt_throw_notbound(env, "process", jprocess);
 219     return 0;
 220   }
 221
 222   /* true is the actor is suspended, false otherwise */
 223   return (jboolean)actor->is_suspended();
 224 }
 225
 226 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_sleep(JNIEnv *env, jclass cls, jlong jmillis, jint jnanos)
 227  {
 228   double time =  ((double)jmillis) / 1000 + ((double)jnanos) / 1000000000;
 229   msg_error_t rv = MSG_OK;
 230   if (not simgrid::ForcefulKillException::try_n_catch([&time]() { simgrid::s4u::this_actor::sleep_for(time); })) {
 231     rv = MSG_HOST_FAILURE;
 232   }
 233   if (rv != MSG_OK) {
 234     jmsg_throw_status(env, rv);
 235   }
 236 }
 237
 238 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_waitFor(JNIEnv * env, jobject jprocess, jdouble jseconds)
 239 {
 240   msg_error_t rv = MSG_OK;
 241   if (not simgrid::ForcefulKillException::try_n_catch(
 242           [&jseconds]() { simgrid::s4u::this_actor::sleep_for((double)jseconds); })) {
 243     rv = MSG_HOST_FAILURE;
 244     jxbt_throw_by_name(env, "org/simgrid/msg/ProcessKilledError", "Process killed");
 245   }
 246   if (env->ExceptionOccurred())
 247     return;
 248   if (rv != MSG_OK) {
 249     XBT_DEBUG("Status NOK");
 250     jmsg_throw_status(env,rv);
 251   }
 252 }
 253
 254 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_kill(JNIEnv * env, jobject jprocess)
 255 {
 256   /* get the native instances from the java ones */
 257   sg_actor_t actor = jprocess_to_native(jprocess, env);
 258   if (not actor) {
 259     jxbt_throw_notbound(env, "process", jprocess);
 260     return;
 261   }
 262   if (not simgrid::ForcefulKillException::try_n_catch([&actor]() { actor->kill(); })) {
 263     jxbt_throw_by_name(env, "org/simgrid/msg/ProcessKilledError", "Process killed");
 264   }
 265 }
 266
 267 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_migrate(JNIEnv * env, jobject jprocess, jobject jhost)
 268 {
 269   sg_actor_t actor = jprocess_to_native(jprocess, env);
 270
 271   if (not actor) {
 272     jxbt_throw_notbound(env, "process", jprocess);
 273     return;
 274   }
 275
 276   sg_host_t host = jhost_get_native(env, jhost);
 277
 278   if (not host) {
 279     jxbt_throw_notbound(env, "host", jhost);
 280     return;
 281   }
 282
 283   /* change the host of the actor */
 284   actor->set_host(host);
 285
 286   /* change the host java side */
 287   env->SetObjectField(jprocess, jprocess_field_Process_host, jhost);
 288 }
 289
 290 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_yield(JNIEnv* env, jclass cls)
 291 {
 292   simgrid::s4u::this_actor::yield();
 293 }
 294
 295 JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_setKillTime (JNIEnv *env , jobject jprocess, jdouble jkilltime) {
 296   jprocess_to_native(jprocess, env)->set_kill_time((double)jkilltime);
 297 }
 298
 299 JNIEXPORT jint JNICALL Java_org_simgrid_msg_Process_getCount(JNIEnv * env, jclass cls) {
 300   return (jint)sg_actor_count();
 301 }