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these archaic callbacks are not used anymore, so kill them
[simgrid.git] / src / simix / ActorImpl.cpp
index 935ca1b..88734d6 100644 (file)
@@ -1,50 +1,40 @@
-/* Copyright (c) 2007-2017. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2007-2018. The SimGrid Team. All rights reserved.          */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
 
-#include <exception>
-#include <functional>
-#include <map>
-#include <string>
-#include <utility>
-
-#include <boost/range/algorithm.hpp>
-
-#include "xbt/ex.hpp"
-#include "xbt/functional.hpp"
-#include "xbt/log.h"
-#include "xbt/sysdep.h"
-#include "xbt/utility.hpp"
-
-#include "simgrid/s4u/Host.hpp"
-
 #include "mc/mc.h"
-
+#include "simgrid/Exception.hpp"
 #include "smx_private.hpp"
+#include "src/kernel/activity/CommImpl.hpp"
+#include "src/kernel/activity/ExecImpl.hpp"
+#include "src/kernel/activity/IoImpl.hpp"
 #include "src/kernel/activity/SleepImpl.hpp"
-#include "src/kernel/activity/SynchroIo.hpp"
 #include "src/kernel/activity/SynchroRaw.hpp"
 #include "src/mc/mc_replay.hpp"
 #include "src/mc/remote/Client.hpp"
-#include "src/msg/msg_private.hpp"
+#include "src/simix/smx_host_private.hpp"
+#include "src/simix/smx_io_private.hpp"
+#include "src/simix/smx_synchro_private.hpp"
+#include "src/surf/HostImpl.hpp"
 #include "src/surf/cpu_interface.hpp"
-#include "src/surf/surf_interface.hpp"
 
 #ifdef HAVE_SMPI
 #include "src/smpi/include/private.hpp"
 #endif
 
+#include <boost/range/algorithm.hpp>
+
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix, "Logging specific to SIMIX (process)");
 
 unsigned long simix_process_maxpid = 0;
 
 /**
- * \brief Returns the current agent.
+ * @brief Returns the current agent.
  *
  * This functions returns the currently running SIMIX process.
  *
- * \return The SIMIX process
+ * @return The SIMIX process
  */
 smx_actor_t SIMIX_process_self()
 {
@@ -54,8 +44,8 @@ smx_actor_t SIMIX_process_self()
 }
 
 /**
- * \brief Returns whether a process has pending asynchronous communications.
- * \return true if there are asynchronous communications in this process
+ * @brief Returns whether a process has pending asynchronous communications.
+ * @return true if there are asynchronous communications in this process
  */
 int SIMIX_process_has_pending_comms(smx_actor_t process) {
 
@@ -63,14 +53,14 @@ int SIMIX_process_has_pending_comms(smx_actor_t process) {
 }
 
 /**
- * \brief Moves a process to the list of processes to destroy.
+ * @brief Moves a process to the list of processes to destroy.
  */
 void SIMIX_process_cleanup(smx_actor_t process)
 {
-  XBT_DEBUG("Cleanup process %s (%p), waiting synchro %p", process->name.c_str(), process,
+  XBT_DEBUG("Cleanup process %s (%p), waiting synchro %p", process->get_cname(), process,
             process->waiting_synchro.get());
 
-  process->finished = true;
+  process->finished_ = true;
   SIMIX_process_on_exit_runall(process);
 
   /* Unregister from the kill timer if any */
@@ -79,7 +69,7 @@ void SIMIX_process_cleanup(smx_actor_t process)
     process->kill_timer = nullptr;
   }
 
-  xbt_os_mutex_acquire(simix_global->mutex);
+  simix_global->mutex.lock();
 
   /* cancel non-blocking communications */
   while (not process->comms.empty()) {
@@ -93,11 +83,11 @@ void SIMIX_process_cleanup(smx_actor_t process)
 
     if (comm->src_proc == process) {
       XBT_DEBUG("Found an unfinished send comm %p (detached = %d), state %d, src = %p, dst = %p", comm.get(),
-                comm->detached, (int)comm->state, comm->src_proc, comm->dst_proc);
+                comm->detached, (int)comm->state_, comm->src_proc, comm->dst_proc);
       comm->src_proc = nullptr;
 
     } else if (comm->dst_proc == process) {
-      XBT_DEBUG("Found an unfinished recv comm %p, state %d, src = %p, dst = %p", comm.get(), (int)comm->state,
+      XBT_DEBUG("Found an unfinished recv comm %p, state %d, src = %p, dst = %p", comm.get(), (int)comm->state_,
                 comm->src_proc, comm->dst_proc);
       comm->dst_proc = nullptr;
 
@@ -111,19 +101,20 @@ void SIMIX_process_cleanup(smx_actor_t process)
     comm->cancel();
   }
 
-  XBT_DEBUG("%p should not be run anymore",process);
-  simix_global->process_list.erase(process->pid);
-  if (process->host && process->host_process_list_hook.is_linked())
-    simgrid::xbt::intrusive_erase(process->host->extension<simgrid::simix::Host>()->process_list, *process);
+  XBT_DEBUG("%s@%s(%ld) should not run anymore", process->get_cname(), process->iface()->get_host()->get_cname(),
+            process->pid_);
+  simix_global->process_list.erase(process->pid_);
+  if (process->host_ && process->host_process_list_hook.is_linked())
+    simgrid::xbt::intrusive_erase(process->host_->pimpl_->process_list_, *process);
   if (not process->smx_destroy_list_hook.is_linked()) {
 #if SIMGRID_HAVE_MC
     xbt_dynar_push_as(simix_global->dead_actors_vector, smx_actor_t, process);
 #endif
     simix_global->process_to_destroy.push_back(*process);
   }
-  process->context->iwannadie = 0;
+  process->context_->iwannadie = false;
 
-  xbt_os_mutex_release(simix_global->mutex);
+  simix_global->mutex.unlock();
 }
 
 /**
@@ -146,14 +137,15 @@ void SIMIX_process_empty_trash()
 
 namespace simgrid {
 
-namespace simix {
+namespace kernel {
+namespace actor {
 
 ActorImpl::~ActorImpl()
 {
-  delete this->context;
+  delete this->context_;
 }
 
-static int dying_daemon(void* exit_status, void* data)
+static void dying_daemon(int /*exit_status*/, void* data)
 {
   std::vector<ActorImpl*>* vect = &simix_global->daemons;
 
@@ -163,14 +155,13 @@ static int dying_daemon(void* exit_status, void* data)
   /* Don't move the whole content since we don't really care about the order */
   std::swap(*it, vect->back());
   vect->pop_back();
-
-  return 0;
 }
+
 /** This process will be terminated automatically when the last non-daemon process finishes */
 void ActorImpl::daemonize()
 {
-  if (not daemon) {
-    daemon = true;
+  if (not daemon_) {
+    daemon_ = true;
     simix_global->daemons.push_back(this);
     SIMIX_process_on_exit(this, dying_daemon, this);
   }
@@ -178,41 +169,31 @@ void ActorImpl::daemonize()
 
 simgrid::s4u::Actor* ActorImpl::restart()
 {
-  XBT_DEBUG("Restarting process %s on %s", getCname(), host->getCname());
+  XBT_DEBUG("Restarting process %s on %s", get_cname(), host_->get_cname());
 
   // retrieve the arguments of the old process
-  // FIXME: Factorize this with SIMIX_host_add_auto_restart_process ?
-  simgrid::simix::ProcessArg arg;
-  arg.name         = name;
-  arg.code         = code;
-  arg.host         = host;
-  arg.kill_time    = SIMIX_timer_get_date(kill_timer);
-  arg.data         = userdata;
-  arg.properties   = nullptr;
-  arg.auto_restart = auto_restart;
+  simgrid::kernel::actor::ProcessArg arg = ProcessArg(host_, this);
 
   // kill the old process
   SIMIX_process_kill(this, (this == simix_global->maestro_process) ? this : SIMIX_process_self());
 
   // start the new process
-  ActorImpl* actor = simix_global->create_process_function(arg.name.c_str(), std::move(arg.code), arg.data, arg.host,
-                                                           arg.properties.get(), nullptr);
-  if (arg.kill_time >= 0)
-    simcall_process_set_kill_time(actor, arg.kill_time);
-  if (arg.auto_restart)
-    actor->auto_restart = arg.auto_restart;
+  ActorImpl* actor =
+      SIMIX_process_create(arg.name.c_str(), std::move(arg.code), arg.data, arg.host, arg.properties.get(), nullptr);
+  simcall_process_set_kill_time(actor, arg.kill_time);
+  actor->set_auto_restart(arg.auto_restart);
 
   return actor->ciface();
 }
 
 smx_activity_t ActorImpl::suspend(ActorImpl* issuer)
 {
-  if (suspended) {
-    XBT_DEBUG("Actor '%s' is already suspended", name.c_str());
+  if (suspended_) {
+    XBT_DEBUG("Actor '%s' is already suspended", get_cname());
     return nullptr;
   }
 
-  suspended = 1;
+  suspended_ = true;
 
   /* If we are suspending another actor that is waiting on a sync, suspend its synchronization. */
   if (this != issuer) {
@@ -222,7 +203,7 @@ smx_activity_t ActorImpl::suspend(ActorImpl* issuer)
 
     return nullptr;
   } else {
-    return SIMIX_execution_start("suspend", 0.0, 1.0, 0.0, this->host);
+    return SIMIX_execution_start("suspend", "", 0.0, 1.0, 0.0, this->host_);
   }
 }
 
@@ -230,14 +211,14 @@ void ActorImpl::resume()
 {
   XBT_IN("process = %p", this);
 
-  if (context->iwannadie) {
+  if (context_->iwannadie) {
     XBT_VERB("Ignoring request to suspend an actor that is currently dying.");
     return;
   }
 
-  if (not suspended)
+  if (not suspended_)
     return;
-  suspended = 0;
+  suspended_ = false;
 
   /* resume the synchronization that was blocking the resumed actor. */
   if (waiting_synchro)
@@ -248,118 +229,163 @@ void ActorImpl::resume()
 
 smx_activity_t ActorImpl::sleep(double duration)
 {
-  if (host->isOff())
-    THROWF(host_error, 0, "Host %s failed, you cannot sleep there.", host->getCname());
+  if (host_->is_off())
+    throw_exception(std::make_exception_ptr(simgrid::HostFailureException(
+        XBT_THROW_POINT, std::string("Host ") + std::string(host_->get_cname()) + " failed, you cannot sleep there.")));
 
   simgrid::kernel::activity::SleepImpl* synchro = new simgrid::kernel::activity::SleepImpl();
-  synchro->host                                 = host;
-  synchro->surf_sleep                           = host->pimpl_cpu->sleep(duration);
-  synchro->surf_sleep->setData(synchro);
+  synchro->host                                 = host_;
+  synchro->surf_sleep                           = host_->pimpl_cpu->sleep(duration);
+  synchro->surf_sleep->set_data(synchro);
   XBT_DEBUG("Create sleep synchronization %p", synchro);
 
   return synchro;
 }
 
-void create_maestro(std::function<void()> code)
+void ActorImpl::throw_exception(std::exception_ptr e)
+{
+  exception = e;
+
+  if (suspended_)
+    resume();
+
+  /* cancel the blocking synchro if any */
+  if (waiting_synchro) {
+
+    simgrid::kernel::activity::ExecImplPtr exec =
+        boost::dynamic_pointer_cast<simgrid::kernel::activity::ExecImpl>(waiting_synchro);
+    if (exec != nullptr && exec->surf_action_)
+      exec->surf_action_->cancel();
+
+    simgrid::kernel::activity::CommImplPtr comm =
+        boost::dynamic_pointer_cast<simgrid::kernel::activity::CommImpl>(waiting_synchro);
+    if (comm != nullptr) {
+      comms.remove(comm);
+      comm->cancel();
+    }
+
+    simgrid::kernel::activity::SleepImplPtr sleep =
+        boost::dynamic_pointer_cast<simgrid::kernel::activity::SleepImpl>(waiting_synchro);
+    if (sleep != nullptr) {
+      SIMIX_process_sleep_destroy(waiting_synchro);
+      if (std::find(begin(simix_global->process_to_run), end(simix_global->process_to_run), this) ==
+              end(simix_global->process_to_run) &&
+          this != SIMIX_process_self()) {
+        XBT_DEBUG("Inserting %s in the to_run list", get_cname());
+        simix_global->process_to_run.push_back(this);
+      }
+    }
+
+    simgrid::kernel::activity::RawImplPtr raw =
+        boost::dynamic_pointer_cast<simgrid::kernel::activity::RawImpl>(waiting_synchro);
+    if (raw != nullptr) {
+      SIMIX_synchro_stop_waiting(this, &simcall);
+    }
+
+    simgrid::kernel::activity::IoImplPtr io =
+        boost::dynamic_pointer_cast<simgrid::kernel::activity::IoImpl>(waiting_synchro);
+    if (io != nullptr) {
+      delete io.get();
+    }
+  }
+  waiting_synchro = nullptr;
+}
+
+void create_maestro(simgrid::simix::ActorCode code)
 {
   smx_actor_t maestro = nullptr;
   /* Create maestro process and initialize it */
-  maestro = new simgrid::simix::ActorImpl();
-  maestro->pid = simix_process_maxpid++;
-  maestro->name = "";
-  maestro->userdata = nullptr;
+  maestro           = new simgrid::kernel::actor::ActorImpl();
+  maestro->pid_     = simix_process_maxpid++;
+  maestro->name_    = "";
+  maestro->set_user_data(nullptr);
 
   if (not code) {
-    maestro->context = SIMIX_context_new(std::function<void()>(), nullptr, maestro);
+    maestro->context_ = SIMIX_context_new(simgrid::simix::ActorCode(), nullptr, maestro);
   } else {
     if (not simix_global)
       xbt_die("simix is not initialized, please call MSG_init first");
-    maestro->context = simix_global->context_factory->create_maestro(code, maestro);
+    maestro->context_ = simix_global->context_factory->create_maestro(code, maestro);
   }
 
   maestro->simcall.issuer = maestro;
   simix_global->maestro_process = maestro;
 }
 
+} // namespace actor
 }
 }
 
 /** @brief Creates and runs the maestro process */
 void SIMIX_maestro_create(void (*code)(void*), void* data)
 {
-  simgrid::simix::create_maestro(std::bind(code, data));
+  simgrid::kernel::actor::create_maestro(std::bind(code, data));
 }
 
 /**
- * \brief Internal function to create a process.
+ * @brief Internal function to create a process.
  *
  * This function actually creates the process.
  * It may be called when a SIMCALL_PROCESS_CREATE simcall occurs,
  * or directly for SIMIX internal purposes. The sure thing is that it's called from maestro context.
  *
- * \return the process created
+ * @return the process created
  */
-smx_actor_t SIMIX_process_create(const char* name, std::function<void()> code, void* data, simgrid::s4u::Host* host,
-                                 std::map<std::string, std::string>* properties, smx_actor_t parent_process)
+smx_actor_t SIMIX_process_create(std::string name, simgrid::simix::ActorCode code, void* data, simgrid::s4u::Host* host,
+                                 std::unordered_map<std::string, std::string>* properties, smx_actor_t parent_process)
 {
 
-  XBT_DEBUG("Start process %s on host '%s'", name, host->getCname());
+  XBT_DEBUG("Start process %s on host '%s'", name.c_str(), host->get_cname());
 
-  if (host->isOff()) {
-    XBT_WARN("Cannot launch process '%s' on failed host '%s'", name, host->getCname());
+  if (host->is_off()) {
+    XBT_WARN("Cannot launch process '%s' on failed host '%s'", name.c_str(), host->get_cname());
     return nullptr;
   }
 
-  smx_actor_t process = new simgrid::simix::ActorImpl();
+  smx_actor_t process = new simgrid::kernel::actor::ActorImpl();
 
   xbt_assert(code && host != nullptr, "Invalid parameters");
   /* Process data */
-  process->pid            = simix_process_maxpid++;
-  process->name           = simgrid::xbt::string(name);
-  process->host           = host;
-  process->userdata       = data;
+  process->pid_           = simix_process_maxpid++;
+  process->name_          = simgrid::xbt::string(name);
+  process->host_          = host;
+  process->set_user_data(data);
   process->simcall.issuer = process;
 
   if (parent_process != nullptr) {
-    process->ppid = parent_process->pid;
+    process->ppid_ = parent_process->pid_;
   }
 
   process->code         = code;
 
-  XBT_VERB("Create context %s", process->name.c_str());
-  process->context = SIMIX_context_new(std::move(code), simix_global->cleanup_process_function, process);
+  XBT_VERB("Create context %s", process->get_cname());
+  process->context_ = SIMIX_context_new(std::move(code), &SIMIX_process_cleanup, process);
 
   /* Add properties */
   if (properties != nullptr)
     for (auto const& kv : *properties)
-      process->setProperty(kv.first, kv.second);
-
-  /* Make sure that the process is initialized for simix, in case we are called from the Host::onCreation signal */
-  if (host->extension<simgrid::simix::Host>() == nullptr)
-    host->extension_set<simgrid::simix::Host>(new simgrid::simix::Host());
+      process->set_property(kv.first, kv.second);
 
   /* Add the process to its host's process list */
-  host->extension<simgrid::simix::Host>()->process_list.push_back(*process);
+  host->pimpl_->process_list_.push_back(*process);
 
-  XBT_DEBUG("Start context '%s'", process->name.c_str());
+  XBT_DEBUG("Start context '%s'", process->get_cname());
 
   /* Now insert it in the global process list and in the process to run list */
-  simix_global->process_list[process->pid] = process;
-  XBT_DEBUG("Inserting %s(%s) in the to_run list", process->getCname(), host->getCname());
+  simix_global->process_list[process->pid_] = process;
+  XBT_DEBUG("Inserting %s(%s) in the to_run list", process->get_cname(), host->get_cname());
   simix_global->process_to_run.push_back(process);
   intrusive_ptr_add_ref(process);
-  /* Tracing the process creation */
-  TRACE_msg_process_create(process->getName(), process->pid, process->host);
 
   /* The onCreation() signal must be delayed until there, where the pid and everything is set */
   simgrid::s4u::ActorPtr tmp = process->iface(); // Passing this directly to onCreation will lead to crashes
-  simgrid::s4u::Actor::onCreation(tmp);
+  simgrid::s4u::Actor::on_creation(tmp);
 
   return process;
 }
 
 smx_actor_t SIMIX_process_attach(const char* name, void* data, const char* hostname,
-                                 std::map<std::string, std::string>* properties, smx_actor_t parent_process)
+                                 std::unordered_map<std::string, std::string>* properties, smx_actor_t parent_process)
 {
   // This is mostly a copy/paste from SIMIX_process_new(),
   // it'd be nice to share some code between those two functions.
@@ -367,69 +393,71 @@ smx_actor_t SIMIX_process_attach(const char* name, void* data, const char* hostn
   sg_host_t host = sg_host_by_name(hostname);
   XBT_DEBUG("Attach process %s on host '%s'", name, hostname);
 
-  if (host->isOff()) {
+  if (host->is_off()) {
     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name, hostname);
     return nullptr;
   }
 
-  smx_actor_t process = new simgrid::simix::ActorImpl();
+  smx_actor_t process = new simgrid::kernel::actor::ActorImpl();
   /* Process data */
-  process->pid = simix_process_maxpid++;
-  process->name = std::string(name);
-  process->host = host;
-  process->userdata       = data;
+  process->pid = simix_process_maxpid++;
+  process->name_ = std::string(name);
+  process->host_ = host;
+  process->set_user_data(data);
   process->simcall.issuer = process;
 
   if (parent_process != nullptr) {
-    process->ppid = parent_process->pid;
+    process->ppid_ = parent_process->pid_;
   }
 
   /* Process data for auto-restart */
   process->code = nullptr;
 
-  XBT_VERB("Create context %s", process->name.c_str());
+  XBT_VERB("Create context %s", process->get_cname());
   if (not simix_global)
     xbt_die("simix is not initialized, please call MSG_init first");
-  process->context = simix_global->context_factory->attach(simix_global->cleanup_process_function, process);
+  process->context_ = simix_global->context_factory->attach(&SIMIX_process_cleanup, process);
 
   /* Add properties */
   if (properties != nullptr)
     for (auto const& kv : *properties)
-      process->setProperty(kv.first, kv.second);
+      process->set_property(kv.first, kv.second);
 
   /* Add the process to it's host process list */
-  host->extension<simgrid::simix::Host>()->process_list.push_back(*process);
+  host->pimpl_->process_list_.push_back(*process);
 
   /* Now insert it in the global process list and in the process to run list */
-  simix_global->process_list[process->pid] = process;
-  XBT_DEBUG("Inserting %s(%s) in the to_run list", process->getCname(), host->getCname());
+  simix_global->process_list[process->pid_] = process;
+  XBT_DEBUG("Inserting %s(%s) in the to_run list", process->get_cname(), host->get_cname());
   simix_global->process_to_run.push_back(process);
+  intrusive_ptr_add_ref(process);
 
-  /* Tracing the process creation */
-  TRACE_msg_process_create(process->getName(), process->pid, process->host);
-
-  auto context = dynamic_cast<simgrid::kernel::context::AttachContext*>(process->context);
+  auto* context = dynamic_cast<simgrid::kernel::context::AttachContext*>(process->context_);
   if (not context)
     xbt_die("Not a suitable context");
 
   context->attach_start();
+
+  /* The onCreation() signal must be delayed until there, where the pid and everything is set */
+  simgrid::s4u::ActorPtr tmp = process->iface(); // Passing this directly to onCreation will lead to crashes
+  simgrid::s4u::Actor::on_creation(tmp);
+
   return process;
 }
 
 void SIMIX_process_detach()
 {
-  auto context = dynamic_cast<simgrid::kernel::context::AttachContext*>(SIMIX_context_self());
+  auto* context = dynamic_cast<simgrid::kernel::context::AttachContext*>(SIMIX_context_self());
   if (not context)
     xbt_die("Not a suitable context");
 
   auto process = context->process();
-  simix_global->cleanup_process_function(process);
+  SIMIX_process_cleanup(process);
   context->attach_stop();
-  delete process;
 }
 
 /**
- * \brief Executes the processes from simix_global->process_to_run.
+ * @brief Executes the processes from simix_global->process_to_run.
  *
  * The processes of simix_global->process_to_run are run (in parallel if
  * possible).  On exit, simix_global->process_to_run is empty, and
@@ -446,29 +474,57 @@ void SIMIX_process_runall()
 }
 
 /**
- * \brief Internal function to kill a SIMIX process.
+ * @brief Internal function to kill a SIMIX process.
  *
  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
  * or directly for SIMIX internal purposes.
  *
- * \param process poor victim
- * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
+ * @param process poor victim
+ * @param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
  */
 void SIMIX_process_kill(smx_actor_t process, smx_actor_t issuer) {
 
-  if (process->finished) {
-    XBT_DEBUG("Ignoring request to kill process %s@%s that is already dead", process->getCname(),
-              process->host->getCname());
+  if (process->finished_) {
+    XBT_DEBUG("Ignoring request to kill process %s@%s that is already dead", process->get_cname(),
+              process->host_->get_cname());
     return;
   }
 
-  XBT_DEBUG("Killing process %s@%s", process->getCname(), process->host->getCname());
+  XBT_DEBUG("Actor '%s'@%s is killing actor '%s'@%s", issuer->get_cname(),
+            (issuer->host_ == nullptr ? "(null)" : issuer->host_->get_cname()), process->get_cname(),
+            process->host_->get_cname());
 
-  process->context->iwannadie = 1;
-  process->blocked = 0;
-  process->suspended = 0;
+  process->context_->iwannadie = true;
+  process->blocked_            = false;
+  process->suspended_          = false;
   process->exception = nullptr;
 
+  // Forcefully kill the actor if its host is turned off. Not an HostFailureException because you should not survive that
+  if (process->host_->is_off()) {
+    /* HORRIBLE HACK: Don't throw an StopRequest exception in Java, because it breaks sometimes.
+     *
+     * It seems to break for the actors started from the Java world, with new Process()
+     * while it works for the ones started from the C world, with the deployment file.
+     * When it happens, the simulation stops brutally with a message "untrapped exception StopRequest".
+     *
+     * From what I understand, it works for the native actors because they have a nice try/catch block around their main
+     * but I fail to have something like that for pure Java actors. That's probably a story of C->Java vs Java->C
+     * calling conventions. The right solution may be to have try/catch(StopRequest) blocks around each native call in
+     * JNI. ie, protect every Java->C++ call from C++ exceptions. But this sounds long and painful to do before we
+     * switch to an automatic generator such as SWIG. For now, we don't throw here that exception that we sometimes fail
+     * to catch.
+     *
+     * One of the unfortunate outcome is that the threads started from the deployment file are not stopped anymore.
+     * Or maybe this is the actors stopping gracefully as opposed to the killed ones? Or maybe this is absolutely all
+     * actors of the Java simulation? I'm not sure. Anyway. Because of them, the simulation hangs at the end, waiting
+     * for them to stop but they won't. The current answer to that is very brutal:
+     * we do a "exit(0)" to kill the JVM from the C code after the call to MSG_run(). Definitely unpleasant.
+     */
+
+    if (simgrid::kernel::context::factory_initializer == nullptr) // Only Java sets a factory_initializer, for now
+      process->throw_exception(std::make_exception_ptr(simgrid::kernel::context::Context::StopRequest("Host failed")));
+  }
+
   /* destroy the blocking synchro if any */
   if (process->waiting_synchro != nullptr) {
 
@@ -484,28 +540,31 @@ void SIMIX_process_kill(smx_actor_t process, smx_actor_t issuer) {
         boost::dynamic_pointer_cast<simgrid::kernel::activity::IoImpl>(process->waiting_synchro);
 
     if (exec != nullptr) {
-      if (exec->surfAction_) {
-        exec->surfAction_->cancel();
-        exec->surfAction_->unref();
-        exec->surfAction_ = nullptr;
+      if (exec->surf_action_) {
+        exec->surf_action_->cancel();
+        exec->surf_action_->unref();
+        exec->surf_action_ = nullptr;
       }
     } else if (comm != nullptr) {
       process->comms.remove(process->waiting_synchro);
       comm->cancel();
       // Remove first occurrence of &process->simcall:
-      auto i = boost::range::find(process->waiting_synchro->simcalls, &process->simcall);
-      if (i != process->waiting_synchro->simcalls.end())
-        process->waiting_synchro->simcalls.remove(&process->simcall);
+      auto i = boost::range::find(process->waiting_synchro->simcalls_, &process->simcall);
+      if (i != process->waiting_synchro->simcalls_.end())
+        process->waiting_synchro->simcalls_.remove(&process->simcall);
     } else if (sleep != nullptr) {
-      SIMIX_process_sleep_destroy(process->waiting_synchro);
-
+      if (sleep->surf_sleep)
+        sleep->surf_sleep->cancel();
+      sleep->post();
     } else if (raw != nullptr) {
       SIMIX_synchro_stop_waiting(process, &process->simcall);
 
     } else if (io != nullptr) {
-      SIMIX_io_destroy(process->waiting_synchro);
+      delete io.get();
     } else {
-      xbt_die("Unknown type of activity");
+      simgrid::kernel::activity::ActivityImplPtr activity = process->waiting_synchro;
+      xbt_die("Activity %s is of unknown type %s", activity->name_.c_str(),
+              simgrid::xbt::demangle(typeid(activity).name()).get());
     }
 
     process->waiting_synchro = nullptr;
@@ -513,22 +572,17 @@ void SIMIX_process_kill(smx_actor_t process, smx_actor_t issuer) {
   if (std::find(begin(simix_global->process_to_run), end(simix_global->process_to_run), process) ==
           end(simix_global->process_to_run) &&
       process != issuer) {
-    XBT_DEBUG("Inserting %s in the to_run list", process->name.c_str());
+    XBT_DEBUG("Inserting %s in the to_run list", process->get_cname());
     simix_global->process_to_run.push_back(process);
   }
 }
 
-/** @brief Ask another process to raise the given exception
- *
- * @param process The process that should raise that exception
- * @param cat category of exception
- * @param value value associated to the exception
- * @param msg string information associated to the exception
- */
+/** @deprecated When this function gets removed, also remove the xbt_ex class, that is only there to help users to
+ * transition */
 void SIMIX_process_throw(smx_actor_t process, xbt_errcat_t cat, int value, const char *msg) {
   SMX_EXCEPTION(process, cat, value, msg);
 
-  if (process->suspended)
+  if (process->suspended_)
     process->resume();
 
   /* cancel the blocking synchro if any */
@@ -536,8 +590,8 @@ void SIMIX_process_throw(smx_actor_t process, xbt_errcat_t cat, int value, const
 
     simgrid::kernel::activity::ExecImplPtr exec =
         boost::dynamic_pointer_cast<simgrid::kernel::activity::ExecImpl>(process->waiting_synchro);
-    if (exec != nullptr && exec->surfAction_)
-      exec->surfAction_->cancel();
+    if (exec != nullptr && exec->surf_action_)
+      exec->surf_action_->cancel();
 
     simgrid::kernel::activity::CommImplPtr comm =
         boost::dynamic_pointer_cast<simgrid::kernel::activity::CommImpl>(process->waiting_synchro);
@@ -553,7 +607,7 @@ void SIMIX_process_throw(smx_actor_t process, xbt_errcat_t cat, int value, const
       if (std::find(begin(simix_global->process_to_run), end(simix_global->process_to_run), process) ==
               end(simix_global->process_to_run) &&
           process != SIMIX_process_self()) {
-        XBT_DEBUG("Inserting %s in the to_run list", process->name.c_str());
+        XBT_DEBUG("Inserting %s in the to_run list", process->get_cname());
         simix_global->process_to_run.push_back(process);
       }
     }
@@ -567,36 +621,30 @@ void SIMIX_process_throw(smx_actor_t process, xbt_errcat_t cat, int value, const
     simgrid::kernel::activity::IoImplPtr io =
         boost::dynamic_pointer_cast<simgrid::kernel::activity::IoImpl>(process->waiting_synchro);
     if (io != nullptr) {
-      SIMIX_io_destroy(process->waiting_synchro);
+      delete io.get();
     }
   }
   process->waiting_synchro = nullptr;
 
 }
 
-void simcall_HANDLER_process_killall(smx_simcall_t simcall, int reset_pid) {
-  SIMIX_process_killall(simcall->issuer, reset_pid);
-}
 /**
- * \brief Kills all running processes.
- * \param issuer this one will not be killed
+ * @brief Kills all running processes.
+ * @param issuer this one will not be killed
  */
-void SIMIX_process_killall(smx_actor_t issuer, int reset_pid)
+void SIMIX_process_killall(smx_actor_t issuer)
 {
   for (auto const& kv : simix_global->process_list)
     if (kv.second != issuer)
       SIMIX_process_kill(kv.second, issuer);
-
-  if (reset_pid > 0)
-    simix_process_maxpid = reset_pid;
 }
 
 void SIMIX_process_change_host(smx_actor_t actor, sg_host_t dest)
 {
   xbt_assert((actor != nullptr), "Invalid parameters");
-  simgrid::xbt::intrusive_erase(actor->host->extension<simgrid::simix::Host>()->process_list, *actor);
-  actor->host = dest;
-  dest->extension<simgrid::simix::Host>()->process_list.push_back(*actor);
+  simgrid::xbt::intrusive_erase(actor->host_->pimpl_->process_list_, *actor);
+  actor->host_ = dest;
+  dest->pimpl_->process_list_.push_back(*actor);
 }
 
 void simcall_HANDLER_process_suspend(smx_simcall_t simcall, smx_actor_t process)
@@ -606,7 +654,7 @@ void simcall_HANDLER_process_suspend(smx_simcall_t simcall, smx_actor_t process)
   if (process != simcall->issuer) {
     SIMIX_simcall_answer(simcall);
   } else {
-    sync_suspend->simcalls.push_back(simcall);
+    sync_suspend->simcalls_.push_back(simcall);
     process->waiting_synchro = sync_suspend;
     process->waiting_synchro->suspend();
   }
@@ -629,12 +677,12 @@ void* SIMIX_process_self_get_data()
   if (not self) {
     return nullptr;
   }
-  return self->getUserData();
+  return self->get_user_data();
 }
 
 void SIMIX_process_self_set_data(void *data)
 {
-  SIMIX_process_self()->setUserData(data);
+  SIMIX_process_self()->set_user_data(data);
 }
 
 
@@ -646,27 +694,19 @@ const char* SIMIX_process_self_get_name() {
   if (process == nullptr || process == simix_global->maestro_process)
     return "maestro";
 
-  return process->name.c_str();
-}
-
-smx_actor_t SIMIX_process_get_by_name(const char* name)
-{
-  for (auto const& kv : simix_global->process_list)
-    if (kv.second->name == name)
-      return kv.second;
-  return nullptr;
+  return process->get_cname();
 }
 
 void simcall_HANDLER_process_join(smx_simcall_t simcall, smx_actor_t process, double timeout)
 {
-  if (process->finished) {
+  if (process->finished_) {
     // The joined process is already finished, just wake up the issuer process right away
     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
     SIMIX_simcall_answer(simcall);
     return;
   }
   smx_activity_t sync = SIMIX_process_join(simcall->issuer, process, timeout);
-  sync->simcalls.push_back(simcall);
+  sync->simcalls_.push_back(simcall);
   simcall->issuer->waiting_synchro = sync;
 }
 
@@ -675,12 +715,11 @@ smx_activity_t SIMIX_process_join(smx_actor_t issuer, smx_actor_t process, doubl
   smx_activity_t res = issuer->sleep(timeout);
   intrusive_ptr_add_ref(res.get());
   SIMIX_process_on_exit(process,
-                        [](void*, void* arg) {
+                        [](int, void* arg) {
                           auto sleep = static_cast<simgrid::kernel::activity::SleepImpl*>(arg);
                           if (sleep->surf_sleep)
-                            sleep->surf_sleep->finish(simgrid::surf::Action::State::done);
+                            sleep->surf_sleep->finish(simgrid::kernel::resource::Action::State::FINISHED);
                           intrusive_ptr_release(sleep);
-                          return 0;
                         },
                         res.get());
   return res;
@@ -695,7 +734,7 @@ void simcall_HANDLER_process_sleep(smx_simcall_t simcall, double duration)
     return;
   }
   smx_activity_t sync = simcall->issuer->sleep(duration);
-  sync->simcalls.push_back(simcall);
+  sync->simcalls_.push_back(simcall);
   simcall->issuer->waiting_synchro = sync;
 }
 
@@ -712,41 +751,45 @@ void SIMIX_process_sleep_destroy(smx_activity_t synchro)
 }
 
 /**
- * \brief Calling this function makes the process to yield.
+ * @brief Calling this function makes the process to yield.
  *
  * Only the current process can call this function, giving back the control to maestro.
  *
- * \param self the current process
+ * @param self the current process
  */
 void SIMIX_process_yield(smx_actor_t self)
 {
-  XBT_DEBUG("Yield actor '%s'", self->getCname());
+  XBT_DEBUG("Yield actor '%s'", self->get_cname());
 
   /* Go into sleep and return control to maestro */
-  self->context->suspend();
+  self->context_->suspend();
 
   /* Ok, maestro returned control to us */
-  XBT_DEBUG("Control returned to me: '%s'", self->name.c_str());
+  XBT_DEBUG("Control returned to me: '%s'", self->get_cname());
 
-  if (self->context->iwannadie){
+  if (self->context_->iwannadie) {
     XBT_DEBUG("I wanna die!");
-    self->finished = true;
+    self->finished_ = true;
     /* execute the on_exit functions */
     SIMIX_process_on_exit_runall(self);
-    /* Add the process to the list of process to restart, only if the host is down */
-    if (self->auto_restart && self->host->isOff()) {
-      SIMIX_host_add_auto_restart_process(self->host, self->getCname(), self->code, self->userdata,
-                                          SIMIX_timer_get_date(self->kill_timer), self->getProperties(),
-                                          self->auto_restart);
+
+    if (self->auto_restart_ && self->host_->is_off() &&
+        watched_hosts.find(self->host_->get_cname()) == watched_hosts.end()) {
+      XBT_DEBUG("Push host %s to watched_hosts because it's off and %s needs to restart", self->host_->get_cname(),
+                self->get_cname());
+      watched_hosts.insert(self->host_->get_cname());
     }
-    XBT_DEBUG("Process %s@%s is dead", self->getCname(), self->host->getCname());
-    self->context->stop();
+
+    XBT_DEBUG("Process %s@%s is dead", self->get_cname(), self->host_->get_cname());
+    self->context_->stop();
+    xbt_backtrace_display_current();
+    xbt_die("I should be dead by now.");
   }
 
-  if (self->suspended) {
+  if (self->suspended_) {
     XBT_DEBUG("Hey! I'm suspended.");
     xbt_assert(self->exception != nullptr, "Gasp! This exception may be lost by subsequent calls.");
-    self->suspended = 0;
+    self->suspended_ = false;
     self->suspend(self);
   }
 
@@ -757,18 +800,11 @@ void SIMIX_process_yield(smx_actor_t self)
     std::rethrow_exception(std::move(exception));
   }
 
-  if(SMPI_switch_data_segment){
-    SMPI_switch_data_segment(self->pid);
+  if (SMPI_switch_data_segment && not self->finished_) {
+    SMPI_switch_data_segment(self->iface());
   }
 }
 
-/* callback: termination */
-void SIMIX_process_exception_terminate(xbt_ex_t * e)
-{
-  xbt_ex_display(e);
-  xbt_abort();
-}
-
 /** @brief Returns the list of processes to run. */
 const std::vector<smx_actor_t>& simgrid::simix::process_get_runnable()
 {
@@ -783,55 +819,48 @@ smx_actor_t SIMIX_process_from_PID(aid_t PID)
 }
 
 void SIMIX_process_on_exit_runall(smx_actor_t process) {
-  smx_process_exit_status_t exit_status = (process->context->iwannadie) ? SMX_EXIT_FAILURE : SMX_EXIT_SUCCESS;
+  simgrid::s4u::Actor::on_destruction(process->iface());
+  smx_process_exit_status_t exit_status = (process->context_->iwannadie) ? SMX_EXIT_FAILURE : SMX_EXIT_SUCCESS;
   while (not process->on_exit.empty()) {
     s_smx_process_exit_fun_t exit_fun = process->on_exit.back();
     process->on_exit.pop_back();
-    (exit_fun.fun)((void*)exit_status, exit_fun.arg);
+    (exit_fun.fun)(exit_status, exit_fun.arg);
   }
 }
 
-void SIMIX_process_on_exit(smx_actor_t process, int_f_pvoid_pvoid_t fun, void *data) {
-  xbt_assert(process, "current process not found: are you in maestro context ?");
-
-  s_smx_process_exit_fun_t exit_fun = {fun, data};
-
-  process->on_exit.push_back(exit_fun);
+void SIMIX_process_on_exit(smx_actor_t process, int_f_pvoid_pvoid_t fun, void* data)
+{
+  SIMIX_process_on_exit(process, [fun](int a, void* b) { fun((void*)(intptr_t)a, b); }, data);
 }
 
-/**
- * \brief Sets the auto-restart status of the process.
- * If set to 1, the process will be automatically restarted when its host comes back.
- */
-void SIMIX_process_auto_restart_set(smx_actor_t process, int auto_restart) {
-  process->auto_restart = auto_restart;
+void SIMIX_process_on_exit(smx_actor_t process, std::function<void(int, void*)> fun, void* data)
+{
+  xbt_assert(process, "current process not found: are you in maestro context ?");
+
+  process->on_exit.emplace_back(s_smx_process_exit_fun_t{fun, data});
 }
 
 /** @brief Restart a process, starting it again from the beginning. */
 /**
- * \ingroup simix_process_management
- * \brief Creates and runs a new SIMIX process.
+ * @ingroup simix_process_management
+ * @brief Creates and runs a new SIMIX process.
  *
  * The structure and the corresponding thread are created and put in the list of ready processes.
  *
- * \param name a name for the process. It is for user-level information and can be nullptr.
- * \param code the main function of the process
- * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and can
+ * @param name a name for the process. It is for user-level information and can be nullptr.
+ * @param code the main function of the process
+ * @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 nullptr.
- * It can be retrieved with the function \ref simcall_process_get_data.
- * \param host where the new agent is executed.
- * \param kill_time time when the process is killed
- * \param argc first argument passed to \a code
- * \param argv second argument passed to \a code
- * \param properties the properties of the process
- * \param auto_restart either it is autorestarting or not.
+ * It can be retrieved with the method ActorImpl::getUserData().
+ * @param host where the new agent is executed.
+ * @param argc first argument passed to @a code
+ * @param argv second argument passed to @a code
+ * @param properties the properties of the process
  */
-extern "C" smx_actor_t simcall_process_create(const char* name, xbt_main_func_t code, void* data, sg_host_t host,
-                                              int argc, char** argv, std::map<std::string, std::string>* properties)
+smx_actor_t simcall_process_create(std::string name, xbt_main_func_t code, void* data, sg_host_t host, int argc,
+                                   char** argv, std::unordered_map<std::string, std::string>* properties)
 {
-  if (name == nullptr)
-    name = "";
-  auto wrapped_code = simgrid::xbt::wrapMain(code, argc, argv);
+  auto wrapped_code = simgrid::xbt::wrap_main(code, argc, argv);
   for (int i = 0; i != argc; ++i)
     xbt_free(argv[i]);
   xbt_free(argv);
@@ -839,13 +868,11 @@ extern "C" smx_actor_t simcall_process_create(const char* name, xbt_main_func_t
   return res;
 }
 
-smx_actor_t simcall_process_create(const char* name, std::function<void()> code, void* data, sg_host_t host,
-                                   std::map<std::string, std::string>* properties)
+smx_actor_t simcall_process_create(std::string name, simgrid::simix::ActorCode code, void* data, sg_host_t host,
+                                   std::unordered_map<std::string, std::string>* properties)
 {
-  if (name == nullptr)
-    name = "";
   smx_actor_t self = SIMIX_process_self();
-  return simgrid::simix::kernelImmediate([name, code, data, host, properties, self] {
+  return simgrid::simix::simcall([name, code, data, host, properties, self] {
     return SIMIX_process_create(name, std::move(code), data, host, properties, self);
   });
 }