X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/a5c439094f924970556f57605c6bab819ab73725..b661d99ad7665d468164a2f957125429515ebf20:/src/simix/smx_process.c

diff --git a/src/simix/smx_process.c b/src/simix/smx_process.c
index c62f82237a..168a00ff23 100644
--- a/src/simix/smx_process.c
+++ b/src/simix/smx_process.c
@@ -1,6 +1,5 @@
-//*     $Id$     */
-
-/* Copyright (c) 2002,2003,2004 Arnaud Legrand. All rights reserved.        */
+/* Copyright (c) 2007, 2008, 2009, 2010. 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. */
@@ -10,21 +9,37 @@
 #include "xbt/log.h"
 #include "xbt/dict.h"
 #include "msg/mailbox.h"
+#include "mc/mc.h"
 
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix,
                                 "Logging specific to SIMIX (process)");
 
-/******************************** Process ************************************/
+unsigned long simix_process_maxpid = 0;
+
 /**
- * \brief Move a process to the list of process to destroy. *
+ * \brief Returns the current agent.
+ *
+ * This functions returns the currently running SIMIX process.
+ *
+ * \return The SIMIX process
  */
+XBT_INLINE smx_process_t SIMIX_process_self(void)
+{
+  smx_context_t self_context = SIMIX_context_self();
 
-void SIMIX_process_cleanup(void *arg)
+  return self_context ? SIMIX_context_get_data(self_context) : NULL;
+}
+
+/**
+ * \brief Move a process to the list of processes to destroy.
+ */
+void SIMIX_process_cleanup(smx_process_t process)
 {
-  xbt_swag_remove(arg, simix_global->process_to_run);
-  xbt_swag_remove(arg, simix_global->process_list);
-  xbt_swag_remove(arg, ((smx_process_t)arg)->smx_host->process_list);
-  xbt_swag_insert(arg, simix_global->process_to_destroy);
+  XBT_DEBUG("Cleanup process %s", process->name);
+  /*xbt_swag_remove(process, simix_global->process_to_run);*/
+  xbt_swag_remove(process, simix_global->process_list);
+  xbt_swag_remove(process, process->smx_host->process_list);
+  xbt_swag_insert(process, simix_global->process_to_destroy);
 }
 
 /** 
@@ -34,444 +49,494 @@ void SIMIX_process_cleanup(void *arg)
  * that have finished (or killed).
  */
 void SIMIX_process_empty_trash(void)
-{ 
+{
   smx_process_t process = NULL;
-  int i;  
 
-  while ((process = xbt_swag_extract(simix_global->process_to_destroy))){
+  while ((process = xbt_swag_extract(simix_global->process_to_destroy))) {
+    SIMIX_context_free(process->context);
+
+    /* Free the exception allocated at creation time */
+    if (process->running_ctx)
+      free(process->running_ctx);
+    if (process->properties)
+      xbt_dict_free(&process->properties);
+
     free(process->name);
     process->name = NULL;
-  
-    if (process->argv) {
-      for (i = 0; i < process->argc; i++)
-        if (process->argv[i])
-          free(process->argv[i]);
-
-      free(process->argv);
-    }
-  
     free(process);
   }
 }
 
 /**
  * \brief Creates and runs the maestro process
- *
  */
-
-void __SIMIX_create_maestro_process()
+void SIMIX_create_maestro_process()
 {
-  smx_process_t process = NULL;
-  process = xbt_new0(s_smx_process_t, 1);
-
-  /* Process data */
-  process->name = (char *)"";
-
-  /*Create the right context type (FIXME: check the return value for success)*/
-  SIMIX_context_create_maestro(&process);
+  smx_process_t maestro = NULL;
+
+  /* Create maestro process and intilialize it */
+  maestro = xbt_new0(s_smx_process_t, 1);
+  maestro->pid = simix_process_maxpid++;
+  maestro->name = (char *) "";
+  maestro->running_ctx = xbt_new(xbt_running_ctx_t, 1);
+  XBT_RUNNING_CTX_INITIALIZE(maestro->running_ctx);
+  maestro->context = SIMIX_context_new(NULL, 0, NULL, NULL, maestro);
+  maestro->request.issuer = maestro;
+
+  simix_global->maestro_process = maestro;
+  return;
+}
 
-  /* Set it as the maestro process */
-  simix_global->maestro_process = process;
-  simix_global->current_process = process;
+/**
+ * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
+ * \return the process created
+ */
+smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
+
+  smx_process_t process;
+  simix_global->create_process_function(
+      &process,
+      args->name,
+      args->code,
+      args->data,
+      args->hostname,
+      args->argc,
+      args->argv,
+      args->properties);
 
-  return;
+  return process;
 }
 
 /**
- * \brief Creates and runs a new #smx_process_t.
+ * \brief Internal function to create a process.
  *
- * 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.
+ * This function actually creates the process.
+ * It may be called when a REQ_PROCESS_CREATE request occurs,
+ * or directly for SIMIX internal purposes.
  *
- * \param name a name for the object. It is for user-level information and can be NULL.
-* \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.
- * \param host the location where the new agent is executed.
- * \param argc first argument passed to \a code
- * \param argv second argument passed to \a code
- * \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.
- * \see smx_process_t
- * \return The new corresponding object.
+ * \return the process created
  */
-smx_process_t SIMIX_process_create(const char *name,
-                                   xbt_main_func_t code, void *data,
-                                   const char *hostname, int argc,
-                                   char **argv, xbt_dict_t properties)
-{
-  smx_process_t process = NULL;
+void SIMIX_process_create(smx_process_t *process,
+                          const char *name,
+                          xbt_main_func_t code,
+                          void *data,
+                          const char *hostname,
+                          int argc, char **argv,
+                          xbt_dict_t properties) {
+
+  *process = NULL;
   smx_host_t host = SIMIX_host_get_by_name(hostname);
 
-  DEBUG2("Start process %s on host %s", name, hostname);
+  XBT_DEBUG("Start process %s on host %s", name, hostname);
 
   if (!SIMIX_host_get_state(host)) {
-    WARN2("Cannot launch process '%s' on failed host '%s'", name, hostname);
-    return NULL;
+    XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
+          hostname);
   }
-  process = xbt_new0(s_smx_process_t, 1);
+  else {
+    *process = xbt_new0(s_smx_process_t, 1);
 
-  xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
+    xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
 
-  /* Process data */
-  process->name = xbt_strdup(name);
-  process->smx_host = host;
-  process->argc = argc;
-  process->argv = argv;
-  process->mutex = NULL;
-  process->cond = NULL;
+    /* Process data */
+    (*process)->pid = simix_process_maxpid++;
+    (*process)->name = xbt_strdup(name);
+    (*process)->smx_host = host;
+    (*process)->data = data;
 
-  /*Create the right context type (FIXME: check the return value for success)*/
-  SIMIX_context_new(&process, code);
+    XBT_VERB("Create context %s", (*process)->name);
+    (*process)->context = SIMIX_context_new(code, argc, argv,
+    	simix_global->cleanup_process_function, *process);
 
-  process->data = data;
-  process->cleanup_func = simix_global->cleanup_process_function;
-  process->cleanup_arg = process;
-
-  /* Add properties */
-  process->properties = properties;
-
-  /* Add the process to it's host process list */
-  xbt_swag_insert(process, host->process_list);
-  
-  SIMIX_context_start(process);
-   
-  /* Now insert it in the global process list and in the process to run list */
-  xbt_swag_insert(process, simix_global->process_list);
-  DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
-  xbt_swag_insert(process, simix_global->process_to_run);
+    (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
+    XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 
-  return process;
+    /* Add properties */
+    (*process)->properties = properties;
+
+    /* Add the process to it's host process list */
+    xbt_swag_insert(*process, host->process_list);
+
+    XBT_DEBUG("Start context '%s'", (*process)->name);
+
+    /* Now insert it in the global process list and in the process to run list */
+    xbt_swag_insert(*process, simix_global->process_list);
+    XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, host->name);
+    xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
+  }
 }
 
 /**
- * \brief Creates and runs a new #smx_process_t hosting a JAVA thread
+ * \brief Internal function to kill a SIMIX process.
+ *
+ * This function may be called when a REQ_PROCESS_KILL request occurs,
+ * or directly for SIMIX internal purposes.
  *
- * Warning: this should only be used in libsimgrid4java, since it create
- * a context with no code, which leads to segfaults in plain libsimgrid
+ * \param process poor victim
  */
-void SIMIX_jprocess_create(const char *name, smx_host_t host,
-                           void *data,
-                           void *jprocess, void *jenv, smx_process_t * res)
-{
-  smx_process_t process = xbt_new0(s_smx_process_t, 1);
-  smx_process_t self = NULL;
-
-  /* HACK: We need this trick because when we xbt_context_new() do
-     syncronization stuff, the s_process field in the m_process needs
-     to have a valid value, and we call xbt_context_new() before
-     returning, of course, ie, before providing a right value to the
-     caller (Java_simgrid_msg_Msg_processCreate) have time to store it
-     in place. This way, we initialize the m_process->simdata->s_process
-     field ourself ASAP.
-
-     All this would be much simpler if the synchronization stuff would be done
-     in the JAVA world, I think.
-   */
-  *res = process;
-
-  DEBUG5("jprocess_create(name=%s,host=%p,data=%p,jproc=%p,jenv=%p)",
-         name, host, data, jprocess, jenv);
-  xbt_assert0(host, "Invalid parameters");
-
-  /* Process data */
-  process->name = xbt_strdup(name);
-  process->smx_host = host;
-  process->argc = 0;
-  process->argv = NULL;
-  process->mutex = NULL;
-  process->cond = NULL;
-  SIMIX_context_new(&process, jprocess);
-  process->data = data;
+void SIMIX_process_kill(smx_process_t process) {
 
-  /* Add the process to it's host process list */
-  xbt_swag_insert(&process, host->process_list);
+  XBT_DEBUG("Killing process %s on %s", process->name, process->smx_host->name);
 
-  /* fix current_process, about which xbt_context_start mocks around */
-  self = simix_global->current_process;
-  SIMIX_context_start(process);
-  simix_global->current_process = self;
+  process->context->iwannadie = 1;
+  process->blocked = 0;
+  process->suspended = 0;
+  /* FIXME: set doexception to 0 also? */
 
-  /* Now insert it in the global process list and in the process to run list */
-  xbt_swag_insert(process, simix_global->process_list);
-  DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
-  xbt_swag_insert(process, simix_global->process_to_run);
-}
+  if (process->waiting_action) {
 
-/** \brief Kill a SIMIX process
- *
- * This function simply kills a \a process... scarry isn't it ? :).
- * \param process poor victim
- *
- */
-void SIMIX_process_kill(smx_process_t process)
-{
-  DEBUG2("Killing process %s on %s", process->name, process->smx_host->name);
+    switch (process->waiting_action->type) {
 
-  /* Cleanup if we were waiting for something */
-  if (process->mutex)
-    xbt_swag_remove(process, process->mutex->sleeping);
+      case SIMIX_ACTION_EXECUTE:          
+      case SIMIX_ACTION_PARALLEL_EXECUTE:
+        SIMIX_host_execution_destroy(process->waiting_action);
+        break;
 
-  if (process->cond)
-    xbt_swag_remove(process, process->cond->sleeping);
+      case SIMIX_ACTION_COMMUNICATE:
+        SIMIX_comm_destroy(process->waiting_action);
+        break;
 
-  DEBUG2("%p here! killing %p", simix_global->current_process, process);
+      case SIMIX_ACTION_SLEEP:
+	SIMIX_process_sleep_destroy(process->waiting_action);
+	break;
 
-  /*FIXME: If we are killing the running process we might call stop directly */  
-  process->iwannadie = 1;
-  __SIMIX_process_schedule(process);
+      case SIMIX_ACTION_SYNCHRO:
+	SIMIX_synchro_stop_waiting(process, &process->request);
+	SIMIX_synchro_destroy(process->waiting_action);
+	break;
 
-  if (process == SIMIX_process_self()) {
-    /* I just killed myself */
-    SIMIX_context_yield();
+      case SIMIX_ACTION_IO:
+	THROW_UNIMPLEMENTED;
+	break;
+    }
   }
+
+  xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 }
 
 /**
- * \brief Return the user data of a #smx_process_t.
- *
- * 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.
- * \param process SIMIX process
- * \return A void pointer to the user data
+ * \brief Kills all running processes.
+ * \param issuer this one will not be killed
  */
-void *SIMIX_process_get_data(smx_process_t process)
+void SIMIX_process_killall(smx_process_t issuer)
 {
+  smx_process_t p = NULL;
+
+  while ((p = xbt_swag_extract(simix_global->process_list))) {
+    if (p != issuer) {
+      SIMIX_process_kill(p);
+    }
+  }
+
+  SIMIX_context_runall(simix_global->process_to_run);
+
+  SIMIX_process_empty_trash();
+}
+
+void SIMIX_process_change_host(smx_process_t process,
+    const char *source, const char *dest)
+{
+  smx_host_t h1 = NULL;
+  smx_host_t h2 = NULL;
   xbt_assert0((process != NULL), "Invalid parameters");
-  return (process->data);
+  h1 = SIMIX_host_get_by_name(source);
+  h2 = SIMIX_host_get_by_name(dest);
+  process->smx_host = h2;
+  xbt_swag_remove(process, h1->process_list);
+  xbt_swag_insert(process, h2->process_list);
 }
 
-/**
- * \brief Set the user data of a #m_process_t.
- *
- * 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.
- * \param process SIMIX process
- * \param data User data
- */
-void SIMIX_process_set_data(smx_process_t process, void *data)
+void SIMIX_pre_process_suspend(smx_req_t req)
+{
+  smx_process_t process = req->process_suspend.process;
+  SIMIX_process_suspend(process, req->issuer);
+
+  if (process != req->issuer) {
+    SIMIX_request_answer(req);
+  }
+  /* If we are suspending ourselves, then just do not replay the request. */
+}
+
+void SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
+{
+  process->suspended = 1;
+
+  /* If we are suspending another process, and it is waiting on an action,
+     suspend it's action. */
+  if (process != issuer) {
+
+    if (process->waiting_action) {
+
+      switch (process->waiting_action->type) {
+
+        case SIMIX_ACTION_EXECUTE:
+        case SIMIX_ACTION_PARALLEL_EXECUTE:
+          SIMIX_host_execution_suspend(process->waiting_action);
+          break;
+
+        case SIMIX_ACTION_COMMUNICATE:
+          SIMIX_comm_suspend(process->waiting_action);
+          break;
+
+        case SIMIX_ACTION_SLEEP:
+          SIMIX_process_sleep_suspend(process->waiting_action);
+          break;
+
+        default:
+          THROW_IMPOSSIBLE;
+      }
+    }
+  }
+}
+
+void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 {
   xbt_assert0((process != NULL), "Invalid parameters");
 
+  process->suspended = 0;
+
+  /* If we are resuming another process, resume the action it was waiting for
+     if any. Otherwise add it to the list of process to run in the next round. */
+  if (process != issuer) {
+
+    if (process->waiting_action) {
+
+      switch (process->waiting_action->type) {
+
+        case SIMIX_ACTION_EXECUTE:          
+        case SIMIX_ACTION_PARALLEL_EXECUTE:
+          SIMIX_host_execution_resume(process->waiting_action);
+          break;
+
+        case SIMIX_ACTION_COMMUNICATE:
+          SIMIX_comm_resume(process->waiting_action);
+          break;
+
+        case SIMIX_ACTION_SLEEP:
+          SIMIX_process_sleep_resume(process->waiting_action);
+          break;
+
+        default:
+          THROW_IMPOSSIBLE;
+      }
+    }
+    else {
+      xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
+    }
+  }
+}
+
+int SIMIX_process_get_maxpid(void) {
+  return simix_process_maxpid;
+}
+
+int SIMIX_process_count(void)
+{
+  return xbt_swag_size(simix_global->process_list);
+}
+
+void* SIMIX_process_self_get_data(void)
+{
+  smx_process_t me = SIMIX_process_self();
+  if (!me) {
+    return NULL;
+  }
+  return SIMIX_process_get_data(me);
+}
+
+void SIMIX_process_self_set_data(void *data)
+{
+  SIMIX_process_set_data(SIMIX_process_self(), data);
+}
+
+void* SIMIX_process_get_data(smx_process_t process)
+{
+  return process->data;
+}
+
+void SIMIX_process_set_data(smx_process_t process, void *data)
+{
   process->data = data;
-  return;
 }
 
-/**
- * \brief Return the location on which an agent is running.
- *
- * 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.
- * \param process SIMIX process
- * \return SIMIX host
- */
 smx_host_t SIMIX_process_get_host(smx_process_t process)
 {
-  xbt_assert0((process != NULL), "Invalid parameters");
-  return (process->smx_host);
+  return process->smx_host;
 }
 
-/**
- * \brief Return the name of an agent.
- *
- * This functions checks whether \a process is a valid pointer or not and return its name.
- * \param process SIMIX process
- * \return The process name
- */
-const char *SIMIX_process_get_name(smx_process_t process)
+/* needs to be public and without request because it is called
+   by exceptions and logging events */
+const char* SIMIX_process_self_get_name(void) {
+
+  smx_process_t process = SIMIX_process_self();
+  if (process == NULL || process == simix_global->maestro_process)
+    return "";
+
+  return SIMIX_process_get_name(process);
+}
+
+const char* SIMIX_process_get_name(smx_process_t process)
 {
-  xbt_assert0((process != NULL), "Invalid parameters");
-  return (process->name);
+  return process->name;
 }
 
-/**
- * \brief Changes the name of an agent.
- *
- * This functions checks whether \a process is a valid pointer or not and return its name.
- * \param process SIMIX process
- * \param name The new process name
- */
-void SIMIX_process_set_name(smx_process_t process, char *name)
+smx_process_t SIMIX_process_get_by_name(const char* name)
 {
-  xbt_assert0((process != NULL), "Invalid parameters");
-  process->name = name;
+  smx_process_t proc;
+
+  xbt_swag_foreach(proc, simix_global->process_list)
+  {
+    if(!strcmp(name, proc->name))
+      return proc;
+  }
+  return NULL;
+}
+
+int SIMIX_process_is_suspended(smx_process_t process)
+{
+  return process->suspended;
 }
 
-/** \ingroup m_process_management
- * \brief Return the properties
- *
- * This functions returns the properties associated with this process
- */
 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 {
   return process->properties;
 }
 
-/**
- * \brief Return the current agent.
- *
- * This functions returns the currently running #smx_process_t.
- * \return The SIMIX process
- */
-smx_process_t SIMIX_process_self(void)
+void SIMIX_pre_process_sleep(smx_req_t req)
 {
-  return simix_global ? simix_global->current_process : NULL;
+  if (MC_IS_ENABLED) {
+    MC_process_clock_add(req->issuer, req->process_sleep.duration);
+    req->process_sleep.result = SIMIX_DONE;
+    SIMIX_request_answer(req);
+    return;
+  }
+  smx_action_t action = SIMIX_process_sleep(req->issuer, req->process_sleep.duration);
+  xbt_fifo_push(action->request_list, req);
+  req->issuer->waiting_action = action;
 }
 
-/**
- * \brief Suspend the process.
- *
- * This functions suspend the process by suspending the action on
- * which it was waiting for the completion.
- *
- * \param process SIMIX process
- */
-void SIMIX_process_suspend(smx_process_t process)
+smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 {
-  xbt_assert0(process, "Invalid parameters");
+  smx_action_t action;
+  smx_host_t host = process->smx_host;
+
+  /* check if the host is active */
+  if (surf_workstation_model->extension.
+      workstation.get_state(host->host) != SURF_RESOURCE_ON) {
+    THROW1(host_error, 0, "Host %s failed, you cannot call this function",
+           host->name);
+  }
 
-  if (process != SIMIX_process_self()) {
+  action = xbt_mallocator_get(simix_global->action_mallocator);
+  action->type = SIMIX_ACTION_SLEEP;
+  action->name = NULL;
+#ifdef HAVE_TRACING
+  action->category = NULL;
+#endif
 
-    if (process->mutex) {
-      /* process blocked on a mutex, only set suspend=1 */
-      process->suspended = 1;
-    } else if (process->cond) {
-      /* process blocked cond, suspend all actions */
+  action->sleep.host = host;
+  action->sleep.surf_sleep =
+      surf_workstation_model->extension.workstation.sleep(host->host, duration);
 
-      /* temporaries variables */
-      smx_cond_t c;
-      xbt_fifo_item_t i;
-      smx_action_t act;
+  surf_workstation_model->action_data_set(action->sleep.surf_sleep, action);
+  XBT_DEBUG("Create sleep action %p", action);
 
-      process->suspended = 1;
-      c = process->cond;
-      xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
-	 surf_workstation_model->suspend(act->surf_action);
-      }
-    } else {
-      process->suspended = 1;
-    }
-  } else {
-    /* process executing, I can create an action and suspend it */
-    smx_action_t dummy;
-    smx_cond_t cond;
-    char name[] = "dummy";
-    process->suspended = 1;
-
-    cond = SIMIX_cond_init();
-    dummy = SIMIX_action_execute(SIMIX_process_get_host(process), name, 0);
-    surf_workstation_model->suspend(dummy->surf_action);
-    SIMIX_register_action_to_condition(dummy, cond);
-    __SIMIX_cond_wait(cond);
-    SIMIX_unregister_action_to_condition(dummy, cond);
-    SIMIX_action_destroy(dummy);
-    SIMIX_cond_destroy(cond);
-  }
-  return;
+  return action;
 }
 
-/**
- * \brief Resume a suspended process.
- *
- * This functions resume a suspended process by resuming the task on which it was waiting for the completion.
- * \param process SIMIX process
- */
-void SIMIX_process_resume(smx_process_t process)
+void SIMIX_post_process_sleep(smx_action_t action)
 {
-  xbt_assert0((process != NULL), "Invalid parameters");
-  SIMIX_CHECK_HOST();
+  smx_req_t req;
+  e_smx_state_t state;
 
-  if (process == SIMIX_process_self())
-    return;
+  while ((req = xbt_fifo_shift(action->request_list))) {
 
-  if (process->mutex) {
-    DEBUG0("Resume process blocked on a mutex");
-    process->suspended = 0;     /* It'll wake up by itself when mutex releases */
-    return;
-  } else if (process->cond) {
-    /* temporaries variables */
-    smx_cond_t c;
-    xbt_fifo_item_t i;
-    smx_action_t act;
-    DEBUG0("Resume process blocked on a conditional");
-    process->suspended = 0;
-    c = process->cond;
-    xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
-      surf_workstation_model->resume(act->surf_action);
+    switch(surf_workstation_model->action_state_get(action->sleep.surf_sleep)){
+      case SURF_ACTION_FAILED:
+        state = SIMIX_SRC_HOST_FAILURE;
+        break;
+
+      case SURF_ACTION_DONE:
+        state = SIMIX_DONE;
+        break;
+
+      default:
+        THROW_IMPOSSIBLE;
+        break;
     }
-    SIMIX_cond_signal(c);
-    return;
-  } else {
-    process->suspended = 0;
-    xbt_swag_insert(process, simix_global->process_to_run);
+    req->process_sleep.result = state;
+    req->issuer->waiting_action = NULL;
+    SIMIX_request_answer(req);
   }
+  SIMIX_process_sleep_destroy(action);
 }
 
-/**
- * \brief Migrates an agent to another location.
- *
- * This function changes the value of the host on which \a process is running.
- */
-void SIMIX_process_change_host(smx_process_t process, char *source, char *dest)
+void SIMIX_process_sleep_destroy(smx_action_t action)
 {
-  xbt_assert0((process != NULL), "Invalid parameters");
-  smx_host_t h1 = SIMIX_host_get_by_name(source);
-  smx_host_t h2 = SIMIX_host_get_by_name(dest);
-  process->smx_host = h2;
-  xbt_swag_remove(process, h1->process_list);
-  xbt_swag_insert(process, h2->process_list);
+  XBT_DEBUG("Destroy action %p", action);
+  if (action->sleep.surf_sleep)
+    action->sleep.surf_sleep->model_type->action_unref(action->sleep.surf_sleep);
+#ifdef HAVE_TRACING
+  TRACE_smx_action_destroy(action);
+#endif
+  xbt_mallocator_release(simix_global->action_mallocator, action);
 }
 
-/**
- * \brief Returns true if the process is suspended .
- *
- * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
- * \param process SIMIX process
- * \return 1, if the process is suspended, else 0.
- */
-int SIMIX_process_is_suspended(smx_process_t process)
+void SIMIX_process_sleep_suspend(smx_action_t action)
 {
-  xbt_assert0((process != NULL), "Invalid parameters");
-
-  return (process->suspended);
+  surf_workstation_model->suspend(action->sleep.surf_sleep);
 }
 
-/**
- * \brief Returns the amount of SIMIX processes in the system
- *
- * Maestro internal process is not counted, only user code processes are
- */
-int SIMIX_process_count()
+void SIMIX_process_sleep_resume(smx_action_t action)
 {
-  return xbt_swag_size(simix_global->process_list);
+  surf_workstation_model->resume(action->sleep.surf_sleep);
 }
 
 /** 
- * Calling this function makes the process process to yield. The process
- * that scheduled it returns from __SIMIX_process_schedule as if nothing
- * had happened.
- * 
- * Only the processes can call this function, giving back the control
- * to the maestro
+ * Calling this function makes the process to yield.
+ * Only the processes can call this function, giving back the control to maestro
  */
-void __SIMIX_process_yield(void)
+void SIMIX_process_yield(void)
 {
-  DEBUG1("Yield process '%s'", simix_global->current_process->name);
-  xbt_assert0((simix_global->current_process != simix_global->maestro_process),
-              "You are not supposed to run this function here!");
+  smx_process_t self = SIMIX_process_self();
+
+  XBT_DEBUG("Yield process '%s'", self->name);
+
+  /* Go into sleep and return control to maestro */
+  SIMIX_context_suspend(self->context);
 
-  SIMIX_context_yield();
+  /* Ok, maestro returned control to us */
+  XBT_DEBUG("Maestro returned control to me: '%s'", self->name);
 
-  if (simix_global->current_process->iwannadie)
-    SIMIX_context_stop(1);
+  if (self->context->iwannadie){
+    XBT_DEBUG("I wanna die!");
+    SIMIX_context_stop(self->context);
+  }
+
+  if (self->doexception) {
+    XBT_DEBUG("Wait, maestro left me an exception");
+    self->doexception = 0;
+    RETHROW;
+  }
 }
 
-void __SIMIX_process_schedule(smx_process_t process)
+/* callback: context fetching */
+xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 {
-  DEBUG1("Scheduling context: '%s'", process->name);
-
-  /* save the current process */
-  smx_process_t self = simix_global->current_process;
+  return SIMIX_process_self()->running_ctx;
+}
 
-  /* update the current process */
-  simix_global->current_process = process;
+/* callback: termination */
+void SIMIX_process_exception_terminate(xbt_ex_t * e)
+{
+  xbt_ex_display(e);
+  abort();
+}
 
-  /* schedule the context */
-  SIMIX_context_schedule(process);
+smx_context_t SIMIX_process_get_context(smx_process_t p) {
+  return p->context;
+}
 
-  /* restore the current process to the previously saved process */
-  simix_global->current_process = self;
+void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
+  p->context = c;
 }