示例#1
0
bool
GOMP_cancellation_point (int which)
{
  if (!gomp_cancel_var)
    return false;

  struct gomp_thread *thr = gomp_thread ();
  struct gomp_team *team = thr->ts.team;
  if (which & (GOMP_CANCEL_LOOP | GOMP_CANCEL_SECTIONS))
    {
      if (team == NULL)
	return false;
      return team->work_share_cancelled != 0;
    }
  else if (which & GOMP_CANCEL_TASKGROUP)
    {
      if (thr->task->taskgroup && thr->task->taskgroup->cancelled)
	return true;
      /* FALLTHRU into the GOMP_CANCEL_PARALLEL case,
	 as #pragma omp cancel parallel also cancels all explicit
	 tasks.  */
    }
  if (team)
    return gomp_team_barrier_cancelled (&team->barrier);
  return false;
}
示例#2
0
文件: task.c 项目: AlexMioMio/gcc
static inline bool
gomp_task_run_pre (struct gomp_task *child_task, struct gomp_task *parent,
		   struct gomp_taskgroup *taskgroup, struct gomp_team *team)
{
  if (parent)
    {
      if (parent->children == child_task)
	parent->children = child_task->next_child;
      if (__builtin_expect (child_task->parent_depends_on, 0)
	  && parent->taskwait->last_parent_depends_on == child_task)
	{
	  if (child_task->prev_child->kind == GOMP_TASK_WAITING
	      && child_task->prev_child->parent_depends_on)
	    parent->taskwait->last_parent_depends_on = child_task->prev_child;
	  else
	    parent->taskwait->last_parent_depends_on = NULL;
	}
    }
  if (taskgroup && taskgroup->children == child_task)
    taskgroup->children = child_task->next_taskgroup;
  child_task->prev_queue->next_queue = child_task->next_queue;
  child_task->next_queue->prev_queue = child_task->prev_queue;
  if (team->task_queue == child_task)
    {
      if (child_task->next_queue != child_task)
	team->task_queue = child_task->next_queue;
      else
	team->task_queue = NULL;
    }
  child_task->kind = GOMP_TASK_TIED;
  if (--team->task_queued_count == 0)
    gomp_team_barrier_clear_task_pending (&team->barrier);
  if ((gomp_team_barrier_cancelled (&team->barrier)
       || (taskgroup && taskgroup->cancelled))
      && !child_task->copy_ctors_done)
    return true;
  return false;
}
示例#3
0
文件: task.c 项目: jtramm/gcc
static inline bool
gomp_task_run_pre (struct gomp_task *child_task, struct gomp_task *parent,
		   struct gomp_team *team)
{
#if _LIBGOMP_CHECKING
  verify_children_queue (child_task, parent);
  verify_taskgroup_queue (child_task);
  verify_task_queue (child_task, team);
#endif

  if (parent)
    {
      /* Adjust children such that it will point to a next child,
	 while the current one is scheduled to be executed.  This way,
	 GOMP_taskwait (and others) can schedule a next task while
	 waiting.

	 Do not remove it entirely from the circular list, as it is
	 still a child, though not one we should consider first (say
	 by GOMP_taskwait).  */
      if (parent->children == child_task)
	parent->children = child_task->next_child;
      /* TIED tasks cannot come before WAITING tasks.  If we're about
	 to make this task TIED, rewire things appropriately.
	 However, a TIED task at the end is perfectly fine.  */
      else if (child_task->next_child->kind == GOMP_TASK_WAITING
	       && child_task->next_child != parent->children)
	{
	  /* Remove from the list.  */
	  child_task->prev_child->next_child = child_task->next_child;
	  child_task->next_child->prev_child = child_task->prev_child;
	  /* Rewire at the end of its siblings.  */
	  child_task->next_child = parent->children;
	  child_task->prev_child = parent->children->prev_child;
	  parent->children->prev_child->next_child = child_task;
	  parent->children->prev_child = child_task;
	}

      /* If the current task (child_task) is at the top of the
	 parent's last_parent_depends_on, it's about to be removed
	 from it.  Adjust last_parent_depends_on appropriately.  */
      if (__builtin_expect (child_task->parent_depends_on, 0)
	  && parent->taskwait->last_parent_depends_on == child_task)
	{
	  /* The last_parent_depends_on list was built with all
	     parent_depends_on entries linked to the prev_child.  Grab
	     the next last_parent_depends_on head from this prev_child if
	     available...  */
	  if (child_task->prev_child->kind == GOMP_TASK_WAITING
	      && child_task->prev_child->parent_depends_on)
	    parent->taskwait->last_parent_depends_on = child_task->prev_child;
	  else
	    {
	      /* ...otherwise, there are no more parent_depends_on
		 entries waiting to run.  In which case, clear the
		 list.  */
	      parent->taskwait->last_parent_depends_on = NULL;
	    }
	}
    }

  /* Adjust taskgroup to point to the next taskgroup.  See note above
     regarding adjustment of children as to why the child_task is not
     removed entirely from the circular list.  */
  struct gomp_taskgroup *taskgroup = child_task->taskgroup;
  if (taskgroup)
    {
      if (taskgroup->children == child_task)
	taskgroup->children = child_task->next_taskgroup;
      /* TIED tasks cannot come before WAITING tasks.  If we're about
	 to make this task TIED, rewire things appropriately.
	 However, a TIED task at the end is perfectly fine.  */
      else if (child_task->next_taskgroup->kind == GOMP_TASK_WAITING
	       && child_task->next_taskgroup != taskgroup->children)
	{
	  /* Remove from the list.  */
	  child_task->prev_taskgroup->next_taskgroup
	    = child_task->next_taskgroup;
	  child_task->next_taskgroup->prev_taskgroup
	    = child_task->prev_taskgroup;
	  /* Rewire at the end of its taskgroup.  */
	  child_task->next_taskgroup = taskgroup->children;
	  child_task->prev_taskgroup = taskgroup->children->prev_taskgroup;
	  taskgroup->children->prev_taskgroup->next_taskgroup = child_task;
	  taskgroup->children->prev_taskgroup = child_task;
	}
    }

  /* Remove child_task from the task_queue.  */
  child_task->prev_queue->next_queue = child_task->next_queue;
  child_task->next_queue->prev_queue = child_task->prev_queue;
  if (team->task_queue == child_task)
    {
      if (child_task->next_queue != child_task)
	team->task_queue = child_task->next_queue;
      else
	team->task_queue = NULL;
    }
  child_task->kind = GOMP_TASK_TIED;

  if (--team->task_queued_count == 0)
    gomp_team_barrier_clear_task_pending (&team->barrier);
  if ((gomp_team_barrier_cancelled (&team->barrier)
       || (taskgroup && taskgroup->cancelled))
      && !child_task->copy_ctors_done)
    return true;
  return false;
}
示例#4
0
文件: task.c 项目: jtramm/gcc
void
gomp_create_target_task (struct gomp_device_descr *devicep,
			 void (*fn) (void *), size_t mapnum, void **hostaddrs,
			 size_t *sizes, unsigned short *kinds,
			 unsigned int flags, void **depend)
{
  struct gomp_thread *thr = gomp_thread ();
  struct gomp_team *team = thr->ts.team;

  /* If parallel or taskgroup has been cancelled, don't start new tasks.  */
  if (team
      && (gomp_team_barrier_cancelled (&team->barrier)
	  || (thr->task->taskgroup && thr->task->taskgroup->cancelled)))
    return;

  struct gomp_target_task *ttask;
  struct gomp_task *task;
  struct gomp_task *parent = thr->task;
  struct gomp_taskgroup *taskgroup = parent->taskgroup;
  bool do_wake;
  size_t depend_size = 0;

  if (depend != NULL)
    depend_size = ((uintptr_t) depend[0]
		   * sizeof (struct gomp_task_depend_entry));
  task = gomp_malloc (sizeof (*task) + depend_size
		      + sizeof (*ttask)
		      + mapnum * (sizeof (void *) + sizeof (size_t)
				  + sizeof (unsigned short)));
  gomp_init_task (task, parent, gomp_icv (false));
  task->kind = GOMP_TASK_WAITING;
  task->in_tied_task = parent->in_tied_task;
  task->taskgroup = taskgroup;
  ttask = (struct gomp_target_task *) &task->depend[(uintptr_t) depend[0]];
  ttask->devicep = devicep;
  ttask->fn = fn;
  ttask->mapnum = mapnum;
  memcpy (ttask->hostaddrs, hostaddrs, mapnum * sizeof (void *));
  ttask->sizes = (size_t *) &ttask->hostaddrs[mapnum];
  memcpy (ttask->sizes, sizes, mapnum * sizeof (size_t));
  ttask->kinds = (unsigned short *) &ttask->sizes[mapnum];
  memcpy (ttask->kinds, kinds, mapnum * sizeof (unsigned short));
  ttask->flags = flags;
  task->fn = gomp_target_task_fn;
  task->fn_data = ttask;
  task->final_task = 0;
  gomp_mutex_lock (&team->task_lock);
  /* If parallel or taskgroup has been cancelled, don't start new tasks.  */
  if (__builtin_expect (gomp_team_barrier_cancelled (&team->barrier)
			|| (taskgroup && taskgroup->cancelled), 0))
    {
      gomp_mutex_unlock (&team->task_lock);
      gomp_finish_task (task);
      free (task);
      return;
    }
  if (taskgroup)
    taskgroup->num_children++;
  if (depend_size)
    {
      gomp_task_handle_depend (task, parent, depend);
      if (task->num_dependees)
	{
	  gomp_mutex_unlock (&team->task_lock);
	  return;
	}
    }
  if (parent->children)
    {
      task->next_child = parent->children;
      task->prev_child = parent->children->prev_child;
      task->next_child->prev_child = task;
      task->prev_child->next_child = task;
    }
  else
    {
      task->next_child = task;
      task->prev_child = task;
    }
  parent->children = task;
  if (taskgroup)
    {
      /* If applicable, place task into its taskgroup.  */
      if (taskgroup->children)
	{
	  task->next_taskgroup = taskgroup->children;
	  task->prev_taskgroup = taskgroup->children->prev_taskgroup;
	  task->next_taskgroup->prev_taskgroup = task;
	  task->prev_taskgroup->next_taskgroup = task;
	}
      else
	{
	  task->next_taskgroup = task;
	  task->prev_taskgroup = task;
	}
      taskgroup->children = task;
    }
  if (team->task_queue)
    {
      task->next_queue = team->task_queue;
      task->prev_queue = team->task_queue->prev_queue;
      task->next_queue->prev_queue = task;
      task->prev_queue->next_queue = task;
    }
  else
    {
      task->next_queue = task;
      task->prev_queue = task;
      team->task_queue = task;
    }
  ++team->task_count;
  ++team->task_queued_count;
  gomp_team_barrier_set_task_pending (&team->barrier);
  do_wake = team->task_running_count + !parent->in_tied_task
	    < team->nthreads;
  gomp_mutex_unlock (&team->task_lock);
  if (do_wake)
    gomp_team_barrier_wake (&team->barrier, 1);
}
示例#5
0
文件: task.c 项目: jtramm/gcc
void
GOMP_task (void (*fn) (void *), void *data, void (*cpyfn) (void *, void *),
	   long arg_size, long arg_align, bool if_clause, unsigned flags,
	   void **depend, int priority)
{
  struct gomp_thread *thr = gomp_thread ();
  struct gomp_team *team = thr->ts.team;

#ifdef HAVE_BROKEN_POSIX_SEMAPHORES
  /* If pthread_mutex_* is used for omp_*lock*, then each task must be
     tied to one thread all the time.  This means UNTIED tasks must be
     tied and if CPYFN is non-NULL IF(0) must be forced, as CPYFN
     might be running on different thread than FN.  */
  if (cpyfn)
    if_clause = false;
  flags &= ~GOMP_TASK_FLAG_UNTIED;
#endif

  /* If parallel or taskgroup has been cancelled, don't start new tasks.  */
  if (team
      && (gomp_team_barrier_cancelled (&team->barrier)
	  || (thr->task->taskgroup && thr->task->taskgroup->cancelled)))
    return;

  if ((flags & GOMP_TASK_FLAG_PRIORITY) == 0)
    priority = 0;
  /* FIXME, use priority.  */
  (void) priority;

  if (!if_clause || team == NULL
      || (thr->task && thr->task->final_task)
      || team->task_count > 64 * team->nthreads)
    {
      struct gomp_task task;

      /* If there are depend clauses and earlier deferred sibling tasks
	 with depend clauses, check if there isn't a dependency.  If there
	 is, we need to wait for them.  There is no need to handle
	 depend clauses for non-deferred tasks other than this, because
	 the parent task is suspended until the child task finishes and thus
	 it can't start further child tasks.  */
      if ((flags & GOMP_TASK_FLAG_DEPEND)
	  && thr->task && thr->task->depend_hash)
	gomp_task_maybe_wait_for_dependencies (depend);

      gomp_init_task (&task, thr->task, gomp_icv (false));
      task.kind = GOMP_TASK_UNDEFERRED;
      task.final_task = (thr->task && thr->task->final_task)
			|| (flags & GOMP_TASK_FLAG_FINAL);
      if (thr->task)
	{
	  task.in_tied_task = thr->task->in_tied_task;
	  task.taskgroup = thr->task->taskgroup;
	}
      thr->task = &task;
      if (__builtin_expect (cpyfn != NULL, 0))
	{
	  char buf[arg_size + arg_align - 1];
	  char *arg = (char *) (((uintptr_t) buf + arg_align - 1)
				& ~(uintptr_t) (arg_align - 1));
	  cpyfn (arg, data);
	  fn (arg);
	}
      else
	fn (data);
      /* Access to "children" is normally done inside a task_lock
	 mutex region, but the only way this particular task.children
	 can be set is if this thread's task work function (fn)
	 creates children.  So since the setter is *this* thread, we
	 need no barriers here when testing for non-NULL.  We can have
	 task.children set by the current thread then changed by a
	 child thread, but seeing a stale non-NULL value is not a
	 problem.  Once past the task_lock acquisition, this thread
	 will see the real value of task.children.  */
      if (task.children != NULL)
	{
	  gomp_mutex_lock (&team->task_lock);
	  gomp_clear_parent (task.children);
	  gomp_mutex_unlock (&team->task_lock);
	}
      gomp_end_task ();
    }
  else
    {
      struct gomp_task *task;
      struct gomp_task *parent = thr->task;
      struct gomp_taskgroup *taskgroup = parent->taskgroup;
      char *arg;
      bool do_wake;
      size_t depend_size = 0;

      if (flags & GOMP_TASK_FLAG_DEPEND)
	depend_size = ((uintptr_t) depend[0]
		       * sizeof (struct gomp_task_depend_entry));
      task = gomp_malloc (sizeof (*task) + depend_size
			  + arg_size + arg_align - 1);
      arg = (char *) (((uintptr_t) (task + 1) + depend_size + arg_align - 1)
		      & ~(uintptr_t) (arg_align - 1));
      gomp_init_task (task, parent, gomp_icv (false));
      task->kind = GOMP_TASK_UNDEFERRED;
      task->in_tied_task = parent->in_tied_task;
      task->taskgroup = taskgroup;
      thr->task = task;
      if (cpyfn)
	{
	  cpyfn (arg, data);
	  task->copy_ctors_done = true;
	}
      else
	memcpy (arg, data, arg_size);
      thr->task = parent;
      task->kind = GOMP_TASK_WAITING;
      task->fn = fn;
      task->fn_data = arg;
      task->final_task = (flags & GOMP_TASK_FLAG_FINAL) >> 1;
      gomp_mutex_lock (&team->task_lock);
      /* If parallel or taskgroup has been cancelled, don't start new
	 tasks.  */
      if (__builtin_expect ((gomp_team_barrier_cancelled (&team->barrier)
			     || (taskgroup && taskgroup->cancelled))
			    && !task->copy_ctors_done, 0))
	{
	  gomp_mutex_unlock (&team->task_lock);
	  gomp_finish_task (task);
	  free (task);
	  return;
	}
      if (taskgroup)
	taskgroup->num_children++;
      if (depend_size)
	{
	  gomp_task_handle_depend (task, parent, depend);
	  if (task->num_dependees)
	    {
	      gomp_mutex_unlock (&team->task_lock);
	      return;
	    }
	}
      if (parent->children)
	{
	  task->next_child = parent->children;
	  task->prev_child = parent->children->prev_child;
	  task->next_child->prev_child = task;
	  task->prev_child->next_child = task;
	}
      else
	{
	  task->next_child = task;
	  task->prev_child = task;
	}
      parent->children = task;
      if (taskgroup)
	{
	  /* If applicable, place task into its taskgroup.  */
	  if (taskgroup->children)
	    {
	      task->next_taskgroup = taskgroup->children;
	      task->prev_taskgroup = taskgroup->children->prev_taskgroup;
	      task->next_taskgroup->prev_taskgroup = task;
	      task->prev_taskgroup->next_taskgroup = task;
	    }
	  else
	    {
	      task->next_taskgroup = task;
	      task->prev_taskgroup = task;
	    }
	  taskgroup->children = task;
	}
      if (team->task_queue)
	{
	  task->next_queue = team->task_queue;
	  task->prev_queue = team->task_queue->prev_queue;
	  task->next_queue->prev_queue = task;
	  task->prev_queue->next_queue = task;
	}
      else
	{
	  task->next_queue = task;
	  task->prev_queue = task;
	  team->task_queue = task;
	}
      ++team->task_count;
      ++team->task_queued_count;
      gomp_team_barrier_set_task_pending (&team->barrier);
      do_wake = team->task_running_count + !parent->in_tied_task
		< team->nthreads;
      gomp_mutex_unlock (&team->task_lock);
      if (do_wake)
	gomp_team_barrier_wake (&team->barrier, 1);
    }
}
示例#6
0
文件: task.c 项目: AlexMioMio/gcc
void
GOMP_task (void (*fn) (void *), void *data, void (*cpyfn) (void *, void *),
	   long arg_size, long arg_align, bool if_clause, unsigned flags,
	   void **depend)
{
  struct gomp_thread *thr = gomp_thread ();
  struct gomp_team *team = thr->ts.team;

#ifdef HAVE_BROKEN_POSIX_SEMAPHORES
  /* If pthread_mutex_* is used for omp_*lock*, then each task must be
     tied to one thread all the time.  This means UNTIED tasks must be
     tied and if CPYFN is non-NULL IF(0) must be forced, as CPYFN
     might be running on different thread than FN.  */
  if (cpyfn)
    if_clause = false;
  if (flags & 1)
    flags &= ~1;
#endif

  /* If parallel or taskgroup has been cancelled, don't start new tasks.  */
  if (team
      && (gomp_team_barrier_cancelled (&team->barrier)
	  || (thr->task->taskgroup && thr->task->taskgroup->cancelled)))
    return;

  if (!if_clause || team == NULL
      || (thr->task && thr->task->final_task)
      || team->task_count > 64 * team->nthreads)
    {
      struct gomp_task task;

      /* If there are depend clauses and earlier deferred sibling tasks
	 with depend clauses, check if there isn't a dependency.  If there
	 is, we need to wait for them.  There is no need to handle
	 depend clauses for non-deferred tasks other than this, because
	 the parent task is suspended until the child task finishes and thus
	 it can't start further child tasks.  */
      if ((flags & 8) && thr->task && thr->task->depend_hash)
	gomp_task_maybe_wait_for_dependencies (depend);

      gomp_init_task (&task, thr->task, gomp_icv (false));
      task.kind = GOMP_TASK_IFFALSE;
      task.final_task = (thr->task && thr->task->final_task) || (flags & 2);
      if (thr->task)
	{
	  task.in_tied_task = thr->task->in_tied_task;
	  task.taskgroup = thr->task->taskgroup;
	}
      thr->task = &task;
      if (__builtin_expect (cpyfn != NULL, 0))
	{
	  char buf[arg_size + arg_align - 1];
	  char *arg = (char *) (((uintptr_t) buf + arg_align - 1)
				& ~(uintptr_t) (arg_align - 1));
	  cpyfn (arg, data);
	  fn (arg);
	}
      else
	fn (data);
      /* Access to "children" is normally done inside a task_lock
	 mutex region, but the only way this particular task.children
	 can be set is if this thread's task work function (fn)
	 creates children.  So since the setter is *this* thread, we
	 need no barriers here when testing for non-NULL.  We can have
	 task.children set by the current thread then changed by a
	 child thread, but seeing a stale non-NULL value is not a
	 problem.  Once past the task_lock acquisition, this thread
	 will see the real value of task.children.  */
      if (task.children != NULL)
	{
	  gomp_mutex_lock (&team->task_lock);
	  gomp_clear_parent (task.children);
	  gomp_mutex_unlock (&team->task_lock);
	}
      gomp_end_task ();
    }
  else
    {
      struct gomp_task *task;
      struct gomp_task *parent = thr->task;
      struct gomp_taskgroup *taskgroup = parent->taskgroup;
      char *arg;
      bool do_wake;
      size_t depend_size = 0;

      if (flags & 8)
	depend_size = ((uintptr_t) depend[0]
		       * sizeof (struct gomp_task_depend_entry));
      task = gomp_malloc (sizeof (*task) + depend_size
			  + arg_size + arg_align - 1);
      arg = (char *) (((uintptr_t) (task + 1) + depend_size + arg_align - 1)
		      & ~(uintptr_t) (arg_align - 1));
      gomp_init_task (task, parent, gomp_icv (false));
      task->kind = GOMP_TASK_IFFALSE;
      task->in_tied_task = parent->in_tied_task;
      task->taskgroup = taskgroup;
      thr->task = task;
      if (cpyfn)
	{
	  cpyfn (arg, data);
	  task->copy_ctors_done = true;
	}
      else
	memcpy (arg, data, arg_size);
      thr->task = parent;
      task->kind = GOMP_TASK_WAITING;
      task->fn = fn;
      task->fn_data = arg;
      task->final_task = (flags & 2) >> 1;
      gomp_mutex_lock (&team->task_lock);
      /* If parallel or taskgroup has been cancelled, don't start new
	 tasks.  */
      if (__builtin_expect ((gomp_team_barrier_cancelled (&team->barrier)
			     || (taskgroup && taskgroup->cancelled))
			    && !task->copy_ctors_done, 0))
	{
	  gomp_mutex_unlock (&team->task_lock);
	  gomp_finish_task (task);
	  free (task);
	  return;
	}
      if (taskgroup)
	taskgroup->num_children++;
      if (depend_size)
	{
	  size_t ndepend = (uintptr_t) depend[0];
	  size_t nout = (uintptr_t) depend[1];
	  size_t i;
	  hash_entry_type ent;

	  task->depend_count = ndepend;
	  task->num_dependees = 0;
	  if (parent->depend_hash == NULL)
	    parent->depend_hash
	      = htab_create (2 * ndepend > 12 ? 2 * ndepend : 12);
	  for (i = 0; i < ndepend; i++)
	    {
	      task->depend[i].addr = depend[2 + i];
	      task->depend[i].next = NULL;
	      task->depend[i].prev = NULL;
	      task->depend[i].task = task;
	      task->depend[i].is_in = i >= nout;
	      task->depend[i].redundant = false;
	      task->depend[i].redundant_out = false;

	      hash_entry_type *slot
		= htab_find_slot (&parent->depend_hash, &task->depend[i],
				  INSERT);
	      hash_entry_type out = NULL, last = NULL;
	      if (*slot)
		{
		  /* If multiple depends on the same task are the
		     same, all but the first one are redundant.
		     As inout/out come first, if any of them is
		     inout/out, it will win, which is the right
		     semantics.  */
		  if ((*slot)->task == task)
		    {
		      task->depend[i].redundant = true;
		      continue;
		    }
		  for (ent = *slot; ent; ent = ent->next)
		    {
		      if (ent->redundant_out)
			break;

		      last = ent;

		      /* depend(in:...) doesn't depend on earlier
			 depend(in:...).  */
		      if (i >= nout && ent->is_in)
			continue;

		      if (!ent->is_in)
			out = ent;

		      struct gomp_task *tsk = ent->task;
		      if (tsk->dependers == NULL)
			{
			  tsk->dependers
			    = gomp_malloc (sizeof (struct gomp_dependers_vec)
					   + 6 * sizeof (struct gomp_task *));
			  tsk->dependers->n_elem = 1;
			  tsk->dependers->allocated = 6;
			  tsk->dependers->elem[0] = task;
			  task->num_dependees++;
			  continue;
			}
		      /* We already have some other dependency on tsk
			 from earlier depend clause.  */
		      else if (tsk->dependers->n_elem
			       && (tsk->dependers->elem[tsk->dependers->n_elem
							- 1]
				   == task))
			continue;
		      else if (tsk->dependers->n_elem
			       == tsk->dependers->allocated)
			{
			  tsk->dependers->allocated
			    = tsk->dependers->allocated * 2 + 2;
			  tsk->dependers
			    = gomp_realloc (tsk->dependers,
					    sizeof (struct gomp_dependers_vec)
					    + (tsk->dependers->allocated
					       * sizeof (struct gomp_task *)));
			}
		      tsk->dependers->elem[tsk->dependers->n_elem++] = task;
		      task->num_dependees++;
		    }
		  task->depend[i].next = *slot;
		  (*slot)->prev = &task->depend[i];
		}
	      *slot = &task->depend[i];

	      /* There is no need to store more than one depend({,in}out:)
		 task per address in the hash table chain for the purpose
		 of creation of deferred tasks, because each out
		 depends on all earlier outs, thus it is enough to record
		 just the last depend({,in}out:).  For depend(in:), we need
		 to keep all of the previous ones not terminated yet, because
		 a later depend({,in}out:) might need to depend on all of
		 them.  So, if the new task's clause is depend({,in}out:),
		 we know there is at most one other depend({,in}out:) clause
		 in the list (out).  For non-deferred tasks we want to see
		 all outs, so they are moved to the end of the chain,
		 after first redundant_out entry all following entries
		 should be redundant_out.  */
	      if (!task->depend[i].is_in && out)
		{
		  if (out != last)
		    {
		      out->next->prev = out->prev;
		      out->prev->next = out->next;
		      out->next = last->next;
		      out->prev = last;
		      last->next = out;
		      if (out->next)
			out->next->prev = out;
		    }
		  out->redundant_out = true;
		}
	    }
	  if (task->num_dependees)
	    {
	      gomp_mutex_unlock (&team->task_lock);
	      return;
	    }
	}
      if (parent->children)
	{
	  task->next_child = parent->children;
	  task->prev_child = parent->children->prev_child;
	  task->next_child->prev_child = task;
	  task->prev_child->next_child = task;
	}
      else
	{
	  task->next_child = task;
	  task->prev_child = task;
	}
      parent->children = task;
      if (taskgroup)
	{
	  if (taskgroup->children)
	    {
	      task->next_taskgroup = taskgroup->children;
	      task->prev_taskgroup = taskgroup->children->prev_taskgroup;
	      task->next_taskgroup->prev_taskgroup = task;
	      task->prev_taskgroup->next_taskgroup = task;
	    }
	  else
	    {
	      task->next_taskgroup = task;
	      task->prev_taskgroup = task;
	    }
	  taskgroup->children = task;
	}
      if (team->task_queue)
	{
	  task->next_queue = team->task_queue;
	  task->prev_queue = team->task_queue->prev_queue;
	  task->next_queue->prev_queue = task;
	  task->prev_queue->next_queue = task;
	}
      else
	{
	  task->next_queue = task;
	  task->prev_queue = task;
	  team->task_queue = task;
	}
      ++team->task_count;
      ++team->task_queued_count;
      gomp_team_barrier_set_task_pending (&team->barrier);
      do_wake = team->task_running_count + !parent->in_tied_task
		< team->nthreads;
      gomp_mutex_unlock (&team->task_lock);
      if (do_wake)
	gomp_team_barrier_wake (&team->barrier, 1);
    }
}
示例#7
0
void
GOMP_taskloop (void (*fn) (void *), void *data, void (*cpyfn) (void *, void *),
	       long arg_size, long arg_align, unsigned flags,
	       unsigned long num_tasks, int priority,
	       TYPE start, TYPE end, TYPE step)
{
  struct gomp_thread *thr = gomp_thread ();
  struct gomp_team *team = thr->ts.team;

#ifdef HAVE_BROKEN_POSIX_SEMAPHORES
  /* If pthread_mutex_* is used for omp_*lock*, then each task must be
     tied to one thread all the time.  This means UNTIED tasks must be
     tied and if CPYFN is non-NULL IF(0) must be forced, as CPYFN
     might be running on different thread than FN.  */
  if (cpyfn)
    flags &= ~GOMP_TASK_FLAG_IF;
  flags &= ~GOMP_TASK_FLAG_UNTIED;
#endif

  /* If parallel or taskgroup has been cancelled, don't start new tasks.  */
  if (team && gomp_team_barrier_cancelled (&team->barrier))
    return;

#ifdef TYPE_is_long
  TYPE s = step;
  if (step > 0)
    {
      if (start >= end)
	return;
      s--;
    }
  else
    {
      if (start <= end)
	return;
      s++;
    }
  UTYPE n = (end - start + s) / step;
#else
  UTYPE n;
  if (flags & GOMP_TASK_FLAG_UP)
    {
      if (start >= end)
	return;
      n = (end - start + step - 1) / step;
    }
  else
    {
      if (start <= end)
	return;
      n = (start - end - step - 1) / -step;
    }
#endif

  TYPE task_step = step;
  unsigned long nfirst = n;
  if (flags & GOMP_TASK_FLAG_GRAINSIZE)
    {
      unsigned long grainsize = num_tasks;
#ifdef TYPE_is_long
      num_tasks = n / grainsize;
#else
      UTYPE ndiv = n / grainsize;
      num_tasks = ndiv;
      if (num_tasks != ndiv)
	num_tasks = ~0UL;
#endif
      if (num_tasks <= 1)
	{
	  num_tasks = 1;
	  task_step = end - start;
	}
      else if (num_tasks >= grainsize
#ifndef TYPE_is_long
	       && num_tasks != ~0UL
#endif
	      )
	{
	  UTYPE mul = num_tasks * grainsize;
	  task_step = (TYPE) grainsize * step;
	  if (mul != n)
	    {
	      task_step += step;
	      nfirst = n - mul - 1;
	    }
	}
      else
	{
	  UTYPE div = n / num_tasks;
	  UTYPE mod = n % num_tasks;
	  task_step = (TYPE) div * step;
	  if (mod)
	    {
	      task_step += step;
	      nfirst = mod - 1;
	    }
	}
    }
  else
    {
      if (num_tasks == 0)
	num_tasks = team ? team->nthreads : 1;
      if (num_tasks >= n)
	num_tasks = n;
      else
	{
	  UTYPE div = n / num_tasks;
	  UTYPE mod = n % num_tasks;
	  task_step = (TYPE) div * step;
	  if (mod)
	    {
	      task_step += step;
	      nfirst = mod - 1;
	    }
	}
    }

  if (flags & GOMP_TASK_FLAG_NOGROUP)
    {
      if (thr->task && thr->task->taskgroup && thr->task->taskgroup->cancelled)
	return;
    }
  else
    ialias_call (GOMP_taskgroup_start) ();

  if (priority > gomp_max_task_priority_var)
    priority = gomp_max_task_priority_var;

  if ((flags & GOMP_TASK_FLAG_IF) == 0 || team == NULL
      || (thr->task && thr->task->final_task)
      || team->task_count + num_tasks > 64 * team->nthreads)
    {
      unsigned long i;
      if (__builtin_expect (cpyfn != NULL, 0))
	{
	  struct gomp_task task[num_tasks];
	  struct gomp_task *parent = thr->task;
	  arg_size = (arg_size + arg_align - 1) & ~(arg_align - 1);
	  char buf[num_tasks * arg_size + arg_align - 1];
	  char *arg = (char *) (((uintptr_t) buf + arg_align - 1)
				& ~(uintptr_t) (arg_align - 1));
	  char *orig_arg = arg;
	  for (i = 0; i < num_tasks; i++)
	    {
	      gomp_init_task (&task[i], parent, gomp_icv (false));
	      task[i].priority = priority;
	      task[i].kind = GOMP_TASK_UNDEFERRED;
	      task[i].final_task = (thr->task && thr->task->final_task)
				   || (flags & GOMP_TASK_FLAG_FINAL);
	      if (thr->task)
		{
		  task[i].in_tied_task = thr->task->in_tied_task;
		  task[i].taskgroup = thr->task->taskgroup;
		}
	      thr->task = &task[i];
	      cpyfn (arg, data);
	      arg += arg_size;
	    }
	  arg = orig_arg;
	  for (i = 0; i < num_tasks; i++)
	    {
	      thr->task = &task[i];
	      ((TYPE *)arg)[0] = start;
	      start += task_step;
	      ((TYPE *)arg)[1] = start;
	      if (i == nfirst)
		task_step -= step;
	      fn (arg);
	      arg += arg_size;
	      if (!priority_queue_empty_p (&task[i].children_queue,
					   MEMMODEL_RELAXED))
		{
		  gomp_mutex_lock (&team->task_lock);
		  gomp_clear_parent (&task[i].children_queue);
		  gomp_mutex_unlock (&team->task_lock);
		}
	      gomp_end_task ();
	    }
	}
      else
	for (i = 0; i < num_tasks; i++)
	  {
	    struct gomp_task task;

	    gomp_init_task (&task, thr->task, gomp_icv (false));
	    task.priority = priority;
	    task.kind = GOMP_TASK_UNDEFERRED;
	    task.final_task = (thr->task && thr->task->final_task)
			      || (flags & GOMP_TASK_FLAG_FINAL);
	    if (thr->task)
	      {
		task.in_tied_task = thr->task->in_tied_task;
		task.taskgroup = thr->task->taskgroup;
	      }
	    thr->task = &task;
	    ((TYPE *)data)[0] = start;
	    start += task_step;
	    ((TYPE *)data)[1] = start;
	    if (i == nfirst)
	      task_step -= step;
	    fn (data);
	    if (!priority_queue_empty_p (&task.children_queue,
					 MEMMODEL_RELAXED))
	      {
		gomp_mutex_lock (&team->task_lock);
		gomp_clear_parent (&task.children_queue);
		gomp_mutex_unlock (&team->task_lock);
	      }
	    gomp_end_task ();
	  }
    }
  else
    {
      struct gomp_task *tasks[num_tasks];
      struct gomp_task *parent = thr->task;
      struct gomp_taskgroup *taskgroup = parent->taskgroup;
      char *arg;
      int do_wake;
      unsigned long i;

      for (i = 0; i < num_tasks; i++)
	{
	  struct gomp_task *task
	    = gomp_malloc (sizeof (*task) + arg_size + arg_align - 1);
	  tasks[i] = task;
	  arg = (char *) (((uintptr_t) (task + 1) + arg_align - 1)
			  & ~(uintptr_t) (arg_align - 1));
	  gomp_init_task (task, parent, gomp_icv (false));
	  task->priority = priority;
	  task->kind = GOMP_TASK_UNDEFERRED;
	  task->in_tied_task = parent->in_tied_task;
	  task->taskgroup = taskgroup;
	  thr->task = task;
	  if (cpyfn)
	    {
	      cpyfn (arg, data);
	      task->copy_ctors_done = true;
	    }
	  else
	    memcpy (arg, data, arg_size);
	  ((TYPE *)arg)[0] = start;
	  start += task_step;
	  ((TYPE *)arg)[1] = start;
	  if (i == nfirst)
	    task_step -= step;
	  thr->task = parent;
	  task->kind = GOMP_TASK_WAITING;
	  task->fn = fn;
	  task->fn_data = arg;
	  task->final_task = (flags & GOMP_TASK_FLAG_FINAL) >> 1;
	}
      gomp_mutex_lock (&team->task_lock);
      /* If parallel or taskgroup has been cancelled, don't start new
	 tasks.  */
      if (__builtin_expect ((gomp_team_barrier_cancelled (&team->barrier)
			     || (taskgroup && taskgroup->cancelled))
			    && cpyfn == NULL, 0))
	{
	  gomp_mutex_unlock (&team->task_lock);
	  for (i = 0; i < num_tasks; i++)
	    {
	      gomp_finish_task (tasks[i]);
	      free (tasks[i]);
	    }
	  if ((flags & GOMP_TASK_FLAG_NOGROUP) == 0)
	    ialias_call (GOMP_taskgroup_end) ();
	  return;
	}
      if (taskgroup)
	taskgroup->num_children += num_tasks;
      for (i = 0; i < num_tasks; i++)
	{
	  struct gomp_task *task = tasks[i];
	  priority_queue_insert (PQ_CHILDREN, &parent->children_queue,
				 task, priority,
				 PRIORITY_INSERT_BEGIN,
				 /*last_parent_depends_on=*/false,
				 task->parent_depends_on);
	  if (taskgroup)
	    priority_queue_insert (PQ_TASKGROUP, &taskgroup->taskgroup_queue,
				   task, priority, PRIORITY_INSERT_BEGIN,
				   /*last_parent_depends_on=*/false,
				   task->parent_depends_on);
	  priority_queue_insert (PQ_TEAM, &team->task_queue, task, priority,
				 PRIORITY_INSERT_END,
				 /*last_parent_depends_on=*/false,
				 task->parent_depends_on);
	  ++team->task_count;
	  ++team->task_queued_count;
	}
      gomp_team_barrier_set_task_pending (&team->barrier);
      if (team->task_running_count + !parent->in_tied_task
	  < team->nthreads)
	{
	  do_wake = team->nthreads - team->task_running_count
		    - !parent->in_tied_task;
	  if ((unsigned long) do_wake > num_tasks)
	    do_wake = num_tasks;
	}
      else
	do_wake = 0;
      gomp_mutex_unlock (&team->task_lock);
      if (do_wake)
	gomp_team_barrier_wake (&team->barrier, do_wake);
    }
  if ((flags & GOMP_TASK_FLAG_NOGROUP) == 0)
    ialias_call (GOMP_taskgroup_end) ();
}