Declaration of the variables at the beginning of the functions

[simgrid.git] / src / simix / smx_synchro.c

diff --git a/src/simix/smx_synchro.c b/src/simix/smx_synchro.c
index 1932708..74fd1f0 100644 (file)
--- a/src/simix/smx_synchro.c
+++ b/src/simix/smx_synchro.c
@@ -17,208 +17,301 @@ XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_synchro, simix,
 /****************************** Synchronization *******************************/
 
 /*********************************** Mutex ************************************/
 /****************************** Synchronization *******************************/
 
 /*********************************** Mutex ************************************/

+
+/**
+ * \brief Initialize a mutex.
+ *
+ * Allocs and creates the data for the mutex. It have to be called before the utilisation of the mutex.
+ * \return A mutex
+ */

 smx_mutex_t SIMIX_mutex_init()
 {
 smx_mutex_t SIMIX_mutex_init()
 {

-       smx_mutex_t m = xbt_new0(s_smx_mutex_t,1);
-       s_smx_process_t p; /* useful to initialize sleeping swag */
-       /* structures initialization */
-       m->using = 0;
-       m->sleeping = xbt_swag_new(xbt_swag_offset(p, synchro_hookup));
-       return m;
+  smx_mutex_t m = xbt_new0(s_smx_mutex_t, 1);
+  s_smx_process_t p;           /* useful to initialize sleeping swag */
+  /* structures initialization */
+  m->using = 0;
+  m->sleeping = xbt_swag_new(xbt_swag_offset(p, synchro_hookup));
+  return m;

 }
 
 }
 

+/**
+ * \brief Locks a mutex.
+ *
+ * Tries to lock a mutex, if the mutex isn't used yet, the process can continue its execution, else it'll be blocked here. You have to call #SIMIX_mutex_unlock to free the mutex.
+ * \param mutex The mutex
+ */

 void SIMIX_mutex_lock(smx_mutex_t mutex)
 {
 void SIMIX_mutex_lock(smx_mutex_t mutex)
 {

-       smx_process_t self = SIMIX_process_self();
-       xbt_assert0((mutex != NULL), "Invalid parameters");
-       
-
-       if (mutex->using) {
-               /* somebody using the mutex, block */
-               xbt_swag_insert(self, mutex->sleeping);
-               self->simdata->mutex = mutex;
-               /* wait for some process make the unlock and wake up me from mutex->sleeping */
-               xbt_context_yield();
-               self->simdata->mutex = NULL;
-
-               /* verify if the process was suspended */
-               while (self->simdata->suspended) {
-                       xbt_context_yield();
-               }
-
-               mutex->using = 1;
-       }
-       else {
-               /* mutex free */
-               mutex->using = 1;
-       }
-       return;
+  smx_process_t self = SIMIX_process_self();
+  xbt_assert0((mutex != NULL), "Invalid parameters");
+
+
+  if (mutex->using) {
+    /* somebody using the mutex, block */
+    xbt_swag_insert(self, mutex->sleeping);
+    self->simdata->mutex = mutex;
+    /* wait for some process make the unlock and wake up me from mutex->sleeping */
+    xbt_context_yield();
+    self->simdata->mutex = NULL;
+
+    /* verify if the process was suspended */
+    while (self->simdata->suspended) {
+      xbt_context_yield();
+    }
+
+    mutex->using = 1;
+  } else {
+    /* mutex free */
+    mutex->using = 1;
+  }
+  return;

 }
 
 }
 

-/* return 1 if the process got the mutex, else 0. */
+/**
+ * \brief Tries to lock a mutex.
+ *
+ * Tries to lock a mutex, return 1 if the mutex is free, 0 else. This function does not block the process if the mutex is used.
+ * \param mutex The mutex
+ * \return 1 - mutex free, 0 - mutex used
+ */

 int SIMIX_mutex_trylock(smx_mutex_t mutex)
 {
 int SIMIX_mutex_trylock(smx_mutex_t mutex)
 {

-       xbt_assert0((mutex != NULL), "Invalid parameters");
-       
-       if (mutex->using) 
-               return 0;
-       else {
-               mutex->using = 1;
-               return 1;
-       }
+  xbt_assert0((mutex != NULL), "Invalid parameters");
+
+  if (mutex->using)
+    return 0;
+  else {
+    mutex->using = 1;
+    return 1;
+  }

 }
 
 }
 

+/**
+ * \brief Unlocks a mutex.
+ *
+ * Unlocks the mutex and wakes up a process blocked on it. If there are no process sleeping, only sets the mutex as free.
+ * \param mutex The mutex
+ */

 void SIMIX_mutex_unlock(smx_mutex_t mutex)
 {
 void SIMIX_mutex_unlock(smx_mutex_t mutex)
 {

-       smx_process_t p;        /*process to wake up */
-       
-       xbt_assert0((mutex != NULL), "Invalid parameters");
-       
-       if (xbt_swag_size(mutex->sleeping) > 0) {
-               p = xbt_swag_extract(mutex->sleeping);
-               mutex->using = 0;
-               xbt_swag_insert(p, simix_global->process_to_run);
-       }
-       else {
-               /* nobody to wake up */
-               mutex->using = 0;
-       }
-       return;
+  smx_process_t p;             /*process to wake up */
+
+  xbt_assert0((mutex != NULL), "Invalid parameters");
+
+  if (xbt_swag_size(mutex->sleeping) > 0) {
+    p = xbt_swag_extract(mutex->sleeping);
+    mutex->using = 0;
+    xbt_swag_insert(p, simix_global->process_to_run);
+  } else {
+    /* nobody to wake up */
+    mutex->using = 0;
+  }
+  return;

 }
 
 }
 

+/**
+ * \brief Destroys a mutex.
+ *
+ * Destroys and frees the mutex's memory. 
+ * \param mutex A mutex
+ */

 void SIMIX_mutex_destroy(smx_mutex_t mutex)
 {
 void SIMIX_mutex_destroy(smx_mutex_t mutex)
 {

-       if ( mutex == NULL )
-               return ;
-       else {
-               xbt_swag_free(mutex->sleeping);
-               xbt_free(mutex);
-               return ;
-       }
+  if (mutex == NULL)
+    return;
+  else {
+    xbt_swag_free(mutex->sleeping);
+    xbt_free(mutex);
+    return;
+  }

 }
 
 /******************************** Conditional *********************************/
 }
 
 /******************************** Conditional *********************************/

+
+/**
+ * \brief Initialize a condition.
+ *
+ * Allocs and creates the data for the condition. It have to be called before the utilisation of the condition.
+ * \return A condition
+ */

 smx_cond_t SIMIX_cond_init()
 {
 smx_cond_t SIMIX_cond_init()
 {

-       smx_cond_t cond = xbt_new0(s_smx_cond_t,1);
-       s_smx_process_t p;
-       
-       cond->sleeping = xbt_swag_new(xbt_swag_offset(p,synchro_hookup));
-       cond->actions = xbt_fifo_new();
-       cond->mutex = NULL;
-       return cond;
+  smx_cond_t cond = xbt_new0(s_smx_cond_t, 1);
+  s_smx_process_t p;
+
+  cond->sleeping = xbt_swag_new(xbt_swag_offset(p, synchro_hookup));
+  cond->actions = xbt_fifo_new();
+  cond->mutex = NULL;
+  return cond;

 }
 
 }
 

+/**
+ * \brief Signalizes a condition.
+ *
+ * Signalizes a condition and wakes up a sleping process. If there are no process sleeping, no action is done.
+ * \param cond A condition
+ */

 void SIMIX_cond_signal(smx_cond_t cond)
 {
 void SIMIX_cond_signal(smx_cond_t cond)
 {

-       xbt_assert0((cond != NULL), "Invalid parameters");

        smx_process_t proc = NULL;
        smx_process_t proc = NULL;

+  DEBUG1("Signal condition %p", cond);
+  xbt_assert0((cond != NULL), "Invalid parameters");
+ 

 
 

-       if (xbt_swag_size(cond->sleeping) >= 1) {
-               proc = xbt_swag_extract(cond->sleeping);
-               xbt_swag_insert(proc, simix_global->process_to_run);
-       }
+  if (xbt_swag_size(cond->sleeping) >= 1) {
+    proc = xbt_swag_extract(cond->sleeping);
+    xbt_swag_insert(proc, simix_global->process_to_run);
+  }

 
 

-       return;
+  return;

 }
 
 }
 

-void SIMIX_cond_wait(smx_cond_t cond,smx_mutex_t mutex)
+/**
+ * \brief Waits on a condition.
+ *
+ * Blocks a process until the signal is called. This functions frees the mutex associated and locks it after its execution.
+ * \param cond A condition
+ * \param mutex A mutex
+ */
+void SIMIX_cond_wait(smx_cond_t cond, smx_mutex_t mutex)

 {
 {

-       smx_action_t act_sleep;
-       xbt_assert0((mutex != NULL), "Invalid parameters");
-       
-       cond->mutex = mutex;
-
-       SIMIX_mutex_unlock(mutex);
-       /* create an action null only if there are no actions already on the condition, usefull if the host crashs */
-       if (xbt_fifo_size(cond->actions) ==0 ) {
-               act_sleep = SIMIX_action_sleep(SIMIX_host_self(), -1);
-               SIMIX_register_action_to_condition(act_sleep,cond);
-               SIMIX_register_condition_to_action(act_sleep,cond);
-               __SIMIX_cond_wait(cond);
-               xbt_fifo_pop(act_sleep->cond_list);
-               SIMIX_action_destroy(act_sleep);
-       }
-       else {
-               __SIMIX_cond_wait(cond);
-       }
-       /* get the mutex again */
-       SIMIX_mutex_lock(cond->mutex);
-
-       return;
+  smx_action_t act_sleep;
+  xbt_assert0((mutex != NULL), "Invalid parameters");
+
+  DEBUG1("Wait condition %p", cond);
+  cond->mutex = mutex;
+
+  SIMIX_mutex_unlock(mutex);
+  /* always create an action null in case there is a host failure */
+/*   if (xbt_fifo_size(cond->actions) == 0) { */
+    act_sleep = SIMIX_action_sleep(SIMIX_host_self(), -1);
+    SIMIX_register_action_to_condition(act_sleep, cond);
+    __SIMIX_cond_wait(cond);
+    SIMIX_unregister_action_to_condition(act_sleep, cond);
+    SIMIX_action_destroy(act_sleep);
+/*   } else { */
+/*     __SIMIX_cond_wait(cond); */
+/*   } */
+  /* get the mutex again */
+  SIMIX_mutex_lock(cond->mutex);
+
+  return;

 }
 
 }
 

-void __SIMIX_cond_wait(smx_cond_t cond)
+xbt_fifo_t SIMIX_cond_get_actions(smx_cond_t cond)

 {
 {

-       smx_process_t self = SIMIX_process_self();
-       xbt_assert0((cond != NULL), "Invalid parameters");
-       
-       /* process status */    
-
-       self->simdata->cond = cond;
-       xbt_swag_insert(self, cond->sleeping);
-       xbt_context_yield();
-       self->simdata->cond = NULL;
-       while (self->simdata->suspended) {
-               xbt_context_yield();
-       }
-       return;
-
+  xbt_assert0((cond != NULL), "Invalid parameters");
+  return cond->actions;

 }
 
 }
 

-void SIMIX_cond_wait_timeout(smx_cond_t cond,smx_mutex_t mutex, double max_duration)
+void __SIMIX_cond_wait(smx_cond_t cond)

 {
 {

-       xbt_assert0((mutex != NULL), "Invalid parameters");
-       smx_action_t act_sleep;
+  smx_process_t self = SIMIX_process_self();
+  xbt_assert0((cond != NULL), "Invalid parameters");

 
 

-       cond->mutex = mutex;
+  /* process status */

 
 

-       SIMIX_mutex_unlock(mutex);
-       if (max_duration >=0) {
-               act_sleep = SIMIX_action_sleep(SIMIX_host_self(), max_duration);
-               SIMIX_register_action_to_condition(act_sleep,cond);
-               SIMIX_register_condition_to_action(act_sleep,cond);
-       }
-       __SIMIX_cond_wait(cond);
+  self->simdata->cond = cond;
+  xbt_swag_insert(self, cond->sleeping);
+  xbt_context_yield();
+  self->simdata->cond = NULL;
+  while (self->simdata->suspended) {
+    xbt_context_yield();
+  }
+  return;

 
 

-       /* get the mutex again */
-       SIMIX_mutex_lock(cond->mutex);
+}

 
 

-       return;
+/**
+ * \brief Waits on a condition with timeout.
+ *
+ * Same behavior of #SIMIX_cond_wait, but waits a maximum time and throws an timeout_error if it happens.
+ * \param cond A condition
+ * \param mutex A mutex
+ * \param max_duration Timeout time
+ */
+void SIMIX_cond_wait_timeout(smx_cond_t cond, smx_mutex_t mutex,
+                            double max_duration)
+{
+  
+  smx_action_t act_sleep;
+  xbt_assert0((mutex != NULL), "Invalid parameters");
+
+  DEBUG1("Timed wait condition %p", cond);
+  cond->mutex = mutex;
+
+  SIMIX_mutex_unlock(mutex);
+  if (max_duration >= 0) {
+    act_sleep = SIMIX_action_sleep(SIMIX_host_self(), max_duration);
+    SIMIX_register_action_to_condition(act_sleep, cond);
+    __SIMIX_cond_wait(cond);
+    SIMIX_unregister_action_to_condition(act_sleep, cond);
+    if (SIMIX_action_get_state(act_sleep) == SURF_ACTION_DONE) {
+      SIMIX_action_destroy(act_sleep);
+      THROW0(timeout_error, 0, "Condition timeout");
+    } else {
+      SIMIX_action_destroy(act_sleep);
+    }
+
+  } else
+    __SIMIX_cond_wait(cond);
+
+  /* get the mutex again */
+  SIMIX_mutex_lock(cond->mutex);
+
+  return;

 }
 
 }
 

+/**
+ * \brief Broadcasts a condition.
+ *
+ * Signalizes a condition and wakes up ALL sleping process. If there are no process sleeping, no action is done.
+ * \param cond A condition
+ */

 void SIMIX_cond_broadcast(smx_cond_t cond)
 {
 void SIMIX_cond_broadcast(smx_cond_t cond)
 {

-       xbt_assert0((cond != NULL), "Invalid parameters");
-       smx_process_t proc = NULL;
-       smx_process_t proc_next = NULL;
+  smx_process_t proc = NULL;
+  smx_process_t proc_next = NULL;

 
 

-       xbt_swag_foreach_safe(proc,proc_next,cond->sleeping) {
-               xbt_swag_remove(proc,cond->sleeping);
-               xbt_swag_insert(proc, simix_global->process_to_run);
-       }
+   xbt_assert0((cond != NULL), "Invalid parameters");

 
 

-       return;
-}
+  DEBUG1("Broadcast condition %p", cond);
+  xbt_swag_foreach_safe(proc, proc_next, cond->sleeping) {
+    xbt_swag_remove(proc, cond->sleeping);
+    xbt_swag_insert(proc, simix_global->process_to_run);
+  }

 
 

-void SIMIX_cond_destroy(smx_cond_t cond)
-{
-       if ( cond == NULL )
-               return ;
-       else {
-               xbt_assert0( xbt_swag_size(cond->sleeping) == 0 , "Cannot destroy conditional");
-               xbt_swag_free(cond->sleeping);
-               xbt_fifo_free(cond->actions);
-               xbt_free(cond);
-               return;
-       }
+  return;

 }
 
 }
 

-void SIMIX_register_condition_to_action(smx_action_t action, smx_cond_t cond)
+/**
+ * \brief Destroys a contidion.
+ *
+ * Destroys and frees the condition's memory. 
+ * \param cond A condition
+ */
+void SIMIX_cond_destroy(smx_cond_t cond)

 {
 {

-       xbt_assert0( (action != NULL) && (cond != NULL), "Invalid parameters");
-
-       xbt_fifo_push(action->cond_list,cond);
+  DEBUG1("Destroy condition %p", cond);
+  if (cond == NULL)
+    return;
+  else {
+    xbt_fifo_item_t item = NULL;
+    smx_action_t action = NULL;
+
+    xbt_assert0(xbt_swag_size(cond->sleeping) == 0,
+               "Cannot destroy conditional since someone is still using it");
+    xbt_swag_free(cond->sleeping);
+
+    DEBUG1("%d actions registered", xbt_fifo_size(cond->actions));
+    __SIMIX_cond_display_actions(cond);
+    xbt_fifo_foreach(cond->actions, item, action, smx_action_t) {
+      SIMIX_unregister_action_to_condition(action, cond);
+    }
+    __SIMIX_cond_display_actions(cond);
+
+    xbt_fifo_free(cond->actions);
+    xbt_free(cond);
+    return;
+  }

 }
 }

-
-