engine_maketasks.c 106 KB
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/*******************************************************************************
 * This file is part of SWIFT.
 * Copyright (c) 2012 Pedro Gonnet (pedro.gonnet@durham.ac.uk)
 *                    Matthieu Schaller (matthieu.schaller@durham.ac.uk)
 *               2015 Peter W. Draper (p.w.draper@durham.ac.uk)
 *                    Angus Lepper (angus.lepper@ed.ac.uk)
 *               2016 John A. Regan (john.a.regan@durham.ac.uk)
 *                    Tom Theuns (tom.theuns@durham.ac.uk)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/

/* Config parameters. */
#include "../config.h"

/* Some standard headers. */
#include <stdlib.h>
#include <unistd.h>

/* MPI headers. */
#ifdef WITH_MPI
#include <mpi.h>
#endif

/* Load the profiler header, if needed. */
#ifdef WITH_PROFILER
#include <gperftools/profiler.h>
#endif

/* This object's header. */
#include "engine.h"

/* Local headers. */
#include "atomic.h"
#include "cell.h"
#include "clocks.h"
#include "cycle.h"
#include "debug.h"
#include "error.h"
#include "proxy.h"
#include "timers.h"

/**
 * @brief Add send tasks for the gravity pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param ci The sending #cell.
 * @param cj Dummy cell containing the nodeID of the receiving node.
 * @param t_grav The send_grav #task, if it has already been created.
 */
void engine_addtasks_send_gravity(struct engine *e, struct cell *ci,
                                  struct cell *cj, struct task *t_grav) {

#ifdef WITH_MPI
  struct link *l = NULL;
  struct scheduler *s = &e->sched;
  const int nodeID = cj->nodeID;

  /* Check if any of the gravity tasks are for the target node. */
  for (l = ci->grav.grav; l != NULL; l = l->next)
    if (l->t->ci->nodeID == nodeID ||
        (l->t->cj != NULL && l->t->cj->nodeID == nodeID))
      break;

  /* If so, attach send tasks. */
  if (l != NULL) {

    /* Create the tasks and their dependencies? */
    if (t_grav == NULL) {

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      /* Make sure this cell is tagged. */
      cell_ensure_tagged(ci);
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      t_grav = scheduler_addtask(s, task_type_send, task_subtype_gpart,
                                 ci->mpi.tag, 0, ci, cj);

      /* The sends should unlock the down pass. */
      scheduler_addunlock(s, t_grav, ci->grav.super->grav.down);

      /* Drift before you send */
      scheduler_addunlock(s, ci->grav.super->grav.drift, t_grav);
    }

    /* Add them to the local cell. */
    engine_addlink(e, &ci->mpi.grav.send, t_grav);
  }

  /* Recurse? */
  if (ci->split)
    for (int k = 0; k < 8; k++)
      if (ci->progeny[k] != NULL)
        engine_addtasks_send_gravity(e, ci->progeny[k], cj, t_grav);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Add send tasks for the hydro pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param ci The sending #cell.
 * @param cj Dummy cell containing the nodeID of the receiving node.
 * @param t_xv The send_xv #task, if it has already been created.
 * @param t_rho The send_rho #task, if it has already been created.
 * @param t_gradient The send_gradient #task, if already created.
 */
void engine_addtasks_send_hydro(struct engine *e, struct cell *ci,
                                struct cell *cj, struct task *t_xv,
                                struct task *t_rho, struct task *t_gradient) {

#ifdef WITH_MPI
  struct link *l = NULL;
  struct scheduler *s = &e->sched;
  const int nodeID = cj->nodeID;

  /* Check if any of the density tasks are for the target node. */
  for (l = ci->hydro.density; l != NULL; l = l->next)
    if (l->t->ci->nodeID == nodeID ||
        (l->t->cj != NULL && l->t->cj->nodeID == nodeID))
      break;

  /* If so, attach send tasks. */
  if (l != NULL) {

    /* Create the tasks and their dependencies? */
    if (t_xv == NULL) {

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      /* Make sure this cell is tagged. */
      cell_ensure_tagged(ci);
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      t_xv = scheduler_addtask(s, task_type_send, task_subtype_xv, ci->mpi.tag,
                               0, ci, cj);
      t_rho = scheduler_addtask(s, task_type_send, task_subtype_rho,
                                ci->mpi.tag, 0, ci, cj);
#ifdef EXTRA_HYDRO_LOOP
      t_gradient = scheduler_addtask(s, task_type_send, task_subtype_gradient,
                                     ci->mpi.tag, 0, ci, cj);
#endif

#ifdef EXTRA_HYDRO_LOOP

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      scheduler_addunlock(s, t_gradient, ci->hydro.super->hydro.end_force);
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      scheduler_addunlock(s, ci->hydro.super->hydro.extra_ghost, t_gradient);

      /* The send_rho task should unlock the super_hydro-cell's extra_ghost
       * task. */
      scheduler_addunlock(s, t_rho, ci->hydro.super->hydro.extra_ghost);

      /* The send_rho task depends on the cell's ghost task. */
      scheduler_addunlock(s, ci->hydro.super->hydro.ghost_out, t_rho);

      /* The send_xv task should unlock the super_hydro-cell's ghost task. */
      scheduler_addunlock(s, t_xv, ci->hydro.super->hydro.ghost_in);

#else
      /* The send_rho task should unlock the super_hydro-cell's kick task. */
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      scheduler_addunlock(s, t_rho, ci->hydro.super->hydro.end_force);
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      /* The send_rho task depends on the cell's ghost task. */
      scheduler_addunlock(s, ci->hydro.super->hydro.ghost_out, t_rho);

      /* The send_xv task should unlock the super_hydro-cell's ghost task. */
      scheduler_addunlock(s, t_xv, ci->hydro.super->hydro.ghost_in);

#endif

      /* Drift before you send */
      scheduler_addunlock(s, ci->hydro.super->hydro.drift, t_xv);
    }

    /* Add them to the local cell. */
    engine_addlink(e, &ci->mpi.hydro.send_xv, t_xv);
    engine_addlink(e, &ci->mpi.hydro.send_rho, t_rho);
#ifdef EXTRA_HYDRO_LOOP
    engine_addlink(e, &ci->mpi.hydro.send_gradient, t_gradient);
#endif
  }

  /* Recurse? */
  if (ci->split)
    for (int k = 0; k < 8; k++)
      if (ci->progeny[k] != NULL)
        engine_addtasks_send_hydro(e, ci->progeny[k], cj, t_xv, t_rho,
                                   t_gradient);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

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/**
 * @brief Add send tasks for the stars pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param ci The sending #cell.
 * @param cj Dummy cell containing the nodeID of the receiving node.
 * @param t_xv The send_xv #task, if it has already been created.
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 * @param t_feedback The send_feed #task, if it has already been created.
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 */
void engine_addtasks_send_stars(struct engine *e, struct cell *ci,
                                struct cell *cj, struct task *t_xv,
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                                struct task *t_feedback) {
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#ifdef WITH_MPI
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  struct link *l = NULL;
  struct scheduler *s = &e->sched;
  const int nodeID = cj->nodeID;

  /* Check if any of the density tasks are for the target node. */
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  for (l = ci->stars.density; l != NULL; l = l->next)
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    if (l->t->ci->nodeID == nodeID ||
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	(l->t->cj != NULL && l->t->cj->nodeID == nodeID))
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      break;

  /* If so, attach send tasks. */
  if (l != NULL) {
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    if (t_feedback == NULL) {
      
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      /* Make sure this cell is tagged. */
      cell_ensure_tagged(ci);
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      /* Create the tasks and their dependencies? */
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      t_feedback = scheduler_addtask(s, task_type_send, task_subtype_spart,
				     ci->mpi.tag, 0, ci, cj);
      
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      /* The send_stars task should unlock the super_cell's kick task. */
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      scheduler_addunlock(s, t_feedback, ci->hydro.super->stars.stars_out);
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      /* Ghost before you send */
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      scheduler_addunlock(s, ci->hydro.super->stars.ghost, t_feedback);
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    }

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    engine_addlink(e, &ci->mpi.stars.send, t_feedback);
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  }

  /* Recurse? */
  if (ci->split)
    for (int k = 0; k < 8; k++)
      if (ci->progeny[k] != NULL)
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        engine_addtasks_send_stars(e, ci->progeny[k], cj, t_xv, t_feedback);
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#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

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/**
 * @brief Add send tasks for the time-step to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param ci The sending #cell.
 * @param cj Dummy cell containing the nodeID of the receiving node.
 * @param t_ti The send_ti #task, if it has already been created.
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 * @param t_limiter The send_limiter #task, if already created.
 * @param with_limiter Are we running with the time-step limiter?
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 */
void engine_addtasks_send_timestep(struct engine *e, struct cell *ci,
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                                   struct cell *cj, struct task *t_ti,
                                   struct task *t_limiter,
                                   const int with_limiter) {
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#ifdef WITH_MPI
  struct link *l = NULL;
  struct scheduler *s = &e->sched;
  const int nodeID = cj->nodeID;

  /* Check if any of the gravity tasks are for the target node. */
  for (l = ci->grav.grav; l != NULL; l = l->next)
    if (l->t->ci->nodeID == nodeID ||
        (l->t->cj != NULL && l->t->cj->nodeID == nodeID))
      break;

  /* Check whether instead any of the hydro tasks are for the target node. */
  if (l == NULL)
    for (l = ci->hydro.density; l != NULL; l = l->next)
      if (l->t->ci->nodeID == nodeID ||
          (l->t->cj != NULL && l->t->cj->nodeID == nodeID))
        break;

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  if (l == NULL)
    for (l = ci->stars.density; l != NULL; l = l->next)
      if (l->t->ci->nodeID == nodeID ||
          (l->t->cj != NULL && l->t->cj->nodeID == nodeID))
        break;

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  /* If found anything, attach send tasks. */
  if (l != NULL) {

    /* Create the tasks and their dependencies? */
    if (t_ti == NULL) {

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      /* Make sure this cell is tagged. */
      cell_ensure_tagged(ci);
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      t_ti = scheduler_addtask(s, task_type_send, task_subtype_tend,
                               ci->mpi.tag, 0, ci, cj);

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      if (with_limiter)
        t_limiter = scheduler_addtask(s, task_type_send, task_subtype_limiter,
                                      ci->mpi.tag, 0, ci, cj);

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      /* The super-cell's timestep task should unlock the send_ti task. */
      scheduler_addunlock(s, ci->super->timestep, t_ti);
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      if (with_limiter) scheduler_addunlock(s, t_limiter, ci->super->timestep);
      if (with_limiter)
        scheduler_addunlock(s, t_limiter, ci->super->timestep_limiter);
      if (with_limiter) scheduler_addunlock(s, ci->super->kick2, t_limiter);
      if (with_limiter)
        scheduler_addunlock(s, ci->super->timestep_limiter, t_ti);
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    }

    /* Add them to the local cell. */
    engine_addlink(e, &ci->mpi.send_ti, t_ti);
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    if (with_limiter) engine_addlink(e, &ci->mpi.limiter.send, t_limiter);
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  }

  /* Recurse? */
  if (ci->split)
    for (int k = 0; k < 8; k++)
      if (ci->progeny[k] != NULL)
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        engine_addtasks_send_timestep(e, ci->progeny[k], cj, t_ti, t_limiter,
                                      with_limiter);
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#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Add recv tasks for hydro pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param c The foreign #cell.
 * @param t_xv The recv_xv #task, if it has already been created.
 * @param t_rho The recv_rho #task, if it has already been created.
 * @param t_gradient The recv_gradient #task, if it has already been created.
 */
void engine_addtasks_recv_hydro(struct engine *e, struct cell *c,
                                struct task *t_xv, struct task *t_rho,
                                struct task *t_gradient) {

#ifdef WITH_MPI
  struct scheduler *s = &e->sched;

  /* Have we reached a level where there are any hydro tasks ? */
  if (t_xv == NULL && c->hydro.density != NULL) {

#ifdef SWIFT_DEBUG_CHECKS
    /* Make sure this cell has a valid tag. */
    if (c->mpi.tag < 0) error("Trying to receive from untagged cell.");
#endif  // SWIFT_DEBUG_CHECKS

    /* Create the tasks. */
    t_xv = scheduler_addtask(s, task_type_recv, task_subtype_xv, c->mpi.tag, 0,
                             c, NULL);
    t_rho = scheduler_addtask(s, task_type_recv, task_subtype_rho, c->mpi.tag,
                              0, c, NULL);
#ifdef EXTRA_HYDRO_LOOP
    t_gradient = scheduler_addtask(s, task_type_recv, task_subtype_gradient,
                                   c->mpi.tag, 0, c, NULL);
#endif
  }

  c->mpi.hydro.recv_xv = t_xv;
  c->mpi.hydro.recv_rho = t_rho;
  c->mpi.hydro.recv_gradient = t_gradient;

  /* Add dependencies. */
  if (c->hydro.sorts != NULL) scheduler_addunlock(s, t_xv, c->hydro.sorts);
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  if (c->stars.sorts != NULL) scheduler_addunlock(s, t_xv, c->stars.sorts);
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  for (struct link *l = c->hydro.density; l != NULL; l = l->next) {
    scheduler_addunlock(s, t_xv, l->t);
    scheduler_addunlock(s, l->t, t_rho);
  }
#ifdef EXTRA_HYDRO_LOOP
  for (struct link *l = c->hydro.gradient; l != NULL; l = l->next) {
    scheduler_addunlock(s, t_rho, l->t);
    scheduler_addunlock(s, l->t, t_gradient);
  }
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  for (struct link *l = c->hydro.force; l != NULL; l = l->next) {
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    scheduler_addunlock(s, t_gradient, l->t);
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  }
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#else
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  for (struct link *l = c->hydro.force; l != NULL; l = l->next) {
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    scheduler_addunlock(s, t_rho, l->t);
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  }
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#endif

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  for (struct link *l = c->stars.density; l != NULL; l = l->next) {
    scheduler_addunlock(s, t_rho, l->t);
  }
    
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  /* Recurse? */
  if (c->split)
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_addtasks_recv_hydro(e, c->progeny[k], t_xv, t_rho, t_gradient);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

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/**
 * @brief Add recv tasks for stars pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param c The foreign #cell.
 * @param t_xv The recv_xv #task, if it has already been created.
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 * @param t_feed The recv_feed #task, if it has already been created.
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 */
void engine_addtasks_recv_stars(struct engine *e, struct cell *c,
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                                struct task *t_xv, struct task *t_feedback) {
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#ifdef WITH_MPI
  struct scheduler *s = &e->sched;

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  /* Have we reached a level where there are any stars tasks ? */
  if (t_feedback == NULL && c->stars.density != NULL) {
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#ifdef SWIFT_DEBUG_CHECKS
    /* Make sure this cell has a valid tag. */
    if (c->mpi.tag < 0) error("Trying to receive from untagged cell.");
#endif  // SWIFT_DEBUG_CHECKS

    /* Create the tasks. */
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    t_feedback = scheduler_addtask(s, task_type_recv, task_subtype_spart,
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                               c->mpi.tag, 0, c, NULL);
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  }

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  c->mpi.stars.recv = t_feedback;
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  for (struct link *l = c->stars.density; l != NULL; l = l->next) {
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    scheduler_addunlock(s, l->t, t_feedback);
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  }
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  for (struct link *l = c->stars.feedback; l != NULL; l = l->next) {
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    scheduler_addunlock(s, t_feedback, l->t);
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  }

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  /* Recurse? */
  if (c->split)
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
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        engine_addtasks_recv_stars(e, c->progeny[k], t_xv, t_feedback);
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#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

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/**
 * @brief Add recv tasks for gravity pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param c The foreign #cell.
 * @param t_grav The recv_gpart #task, if it has already been created.
 */
void engine_addtasks_recv_gravity(struct engine *e, struct cell *c,
                                  struct task *t_grav) {

#ifdef WITH_MPI
  struct scheduler *s = &e->sched;

  /* Have we reached a level where there are any gravity tasks ? */
  if (t_grav == NULL && c->grav.grav != NULL) {

#ifdef SWIFT_DEBUG_CHECKS
    /* Make sure this cell has a valid tag. */
    if (c->mpi.tag < 0) error("Trying to receive from untagged cell.");
#endif  // SWIFT_DEBUG_CHECKS

    /* Create the tasks. */
    t_grav = scheduler_addtask(s, task_type_recv, task_subtype_gpart,
                               c->mpi.tag, 0, c, NULL);
  }

  c->mpi.grav.recv = t_grav;

  for (struct link *l = c->grav.grav; l != NULL; l = l->next)
    scheduler_addunlock(s, t_grav, l->t);

  /* Recurse? */
  if (c->split)
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_addtasks_recv_gravity(e, c->progeny[k], t_grav);

#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Add recv tasks for gravity pairs to a hierarchy of cells.
 *
 * @param e The #engine.
 * @param c The foreign #cell.
 * @param t_ti The recv_ti #task, if already been created.
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 * @param t_limiter The recv_limiter #task, if already created.
 * @param with_limiter Are we running with the time-step limiter?
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 */
void engine_addtasks_recv_timestep(struct engine *e, struct cell *c,
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                                   struct task *t_ti, struct task *t_limiter,
                                   const int with_limiter) {
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#ifdef WITH_MPI
  struct scheduler *s = &e->sched;

  /* Have we reached a level where there are any self/pair tasks ? */
  if (t_ti == NULL && (c->grav.grav != NULL || c->hydro.density != NULL)) {

#ifdef SWIFT_DEBUG_CHECKS
    /* Make sure this cell has a valid tag. */
    if (c->mpi.tag < 0) error("Trying to receive from untagged cell.");
#endif  // SWIFT_DEBUG_CHECKS

    t_ti = scheduler_addtask(s, task_type_recv, task_subtype_tend, c->mpi.tag,
                             0, c, NULL);
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    if (with_limiter)
      t_limiter = scheduler_addtask(s, task_type_recv, task_subtype_limiter,
                                    c->mpi.tag, 0, c, NULL);
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  }

  c->mpi.recv_ti = t_ti;

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  for (struct link *l = c->grav.grav; l != NULL; l = l->next) {
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    scheduler_addunlock(s, l->t, t_ti);
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  }
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  if (with_limiter) {

    for (struct link *l = c->hydro.force; l != NULL; l = l->next) {
      scheduler_addunlock(s, l->t, t_limiter);
    }

    for (struct link *l = c->hydro.limiter; l != NULL; l = l->next) {
      scheduler_addunlock(s, t_limiter, l->t);
      scheduler_addunlock(s, l->t, t_ti);
    }

  } else {

    for (struct link *l = c->hydro.force; l != NULL; l = l->next) {
      scheduler_addunlock(s, l->t, t_ti);
    }
  }
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  for (struct link *l = c->stars.feedback; l != NULL; l = l->next)
    scheduler_addunlock(s, l->t, t_ti);

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  /* Recurse? */
  if (c->split)
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
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        engine_addtasks_recv_timestep(e, c->progeny[k], t_ti, t_limiter,
                                      with_limiter);
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#else
  error("SWIFT was not compiled with MPI support.");
#endif
}

/**
 * @brief Generate the hydro hierarchical tasks for a hierarchy of cells -
 * i.e. all the O(Npart) tasks -- timestep version
 *
 * Tasks are only created here. The dependencies will be added later on.
 *
 * Note that there is no need to recurse below the super-cell. Note also
 * that we only add tasks if the relevant particles are present in the cell.
 *
 * @param e The #engine.
 * @param c The #cell.
 */
void engine_make_hierarchical_tasks_common(struct engine *e, struct cell *c) {

  struct scheduler *s = &e->sched;
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  const int with_limiter = (e->policy & engine_policy_limiter);
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  /* Are we in a super-cell ? */
  if (c->super == c) {

    /* Local tasks only... */
    if (c->nodeID == e->nodeID) {

      /* Add the two half kicks */
      c->kick1 = scheduler_addtask(s, task_type_kick1, task_subtype_none, 0, 0,
                                   c, NULL);

#if defined(WITH_LOGGER)
      c->logger = scheduler_addtask(s, task_type_logger, task_subtype_none, 0,
                                    0, c, NULL);
#endif

      c->kick2 = scheduler_addtask(s, task_type_kick2, task_subtype_none, 0, 0,
                                   c, NULL);

      /* Add the time-step calculation task and its dependency */
      c->timestep = scheduler_addtask(s, task_type_timestep, task_subtype_none,
                                      0, 0, c, NULL);

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      scheduler_addunlock(s, c->kick2, c->timestep);
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      scheduler_addunlock(s, c->timestep, c->kick1);

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      /* Time-step limiting */
      if (with_limiter) {
        c->timestep_limiter = scheduler_addtask(
            s, task_type_timestep_limiter, task_subtype_none, 0, 0, c, NULL);

        /* Make sure it is not run before kick2 */
        scheduler_addunlock(s, c->timestep, c->timestep_limiter);
        scheduler_addunlock(s, c->timestep_limiter, c->kick1);
      }

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#if defined(WITH_LOGGER)
      scheduler_addunlock(s, c->kick1, c->logger);
#endif
    }
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  } else { /* We are above the super-cell so need to go deeper */
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    /* Recurse. */
    if (c->split)
      for (int k = 0; k < 8; k++)
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        if (c->progeny[k] != NULL)
          engine_make_hierarchical_tasks_common(e, c->progeny[k]);
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  }
}

/**
 * @brief Generate the hydro hierarchical tasks for a hierarchy of cells -
 * i.e. all the O(Npart) tasks -- gravity version
 *
 * Tasks are only created here. The dependencies will be added later on.
 *
 * Note that there is no need to recurse below the super-cell. Note also
 * that we only add tasks if the relevant particles are present in the cell.
 *
 * @param e The #engine.
 * @param c The #cell.
 */
void engine_make_hierarchical_tasks_gravity(struct engine *e, struct cell *c) {

  struct scheduler *s = &e->sched;
  const int periodic = e->s->periodic;
  const int is_self_gravity = (e->policy & engine_policy_self_gravity);

  /* Are we in a super-cell ? */
  if (c->grav.super == c) {

    /* Local tasks only... */
    if (c->nodeID == e->nodeID) {

      c->grav.drift = scheduler_addtask(s, task_type_drift_gpart,
                                        task_subtype_none, 0, 0, c, NULL);

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      c->grav.end_force = scheduler_addtask(s, task_type_end_grav_force,
                                            task_subtype_none, 0, 0, c, NULL);

      scheduler_addunlock(s, c->grav.end_force, c->super->kick2);

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      if (is_self_gravity) {

        /* Initialisation of the multipoles */
        c->grav.init = scheduler_addtask(s, task_type_init_grav,
                                         task_subtype_none, 0, 0, c, NULL);

        /* Gravity non-neighbouring pm calculations */
        c->grav.long_range = scheduler_addtask(
            s, task_type_grav_long_range, task_subtype_none, 0, 0, c, NULL);

        /* Gravity recursive down-pass */
        c->grav.down = scheduler_addtask(s, task_type_grav_down,
                                         task_subtype_none, 0, 0, c, NULL);

        /* Implicit tasks for the up and down passes */
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        c->grav.drift_out = scheduler_addtask(s, task_type_drift_gpart_out,
                                              task_subtype_none, 0, 1, c, NULL);
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        c->grav.init_out = scheduler_addtask(s, task_type_init_grav_out,
                                             task_subtype_none, 0, 1, c, NULL);
        c->grav.down_in = scheduler_addtask(s, task_type_grav_down_in,
                                            task_subtype_none, 0, 1, c, NULL);

        /* Gravity mesh force propagation */
        if (periodic)
          c->grav.mesh = scheduler_addtask(s, task_type_grav_mesh,
                                           task_subtype_none, 0, 0, c, NULL);

        if (periodic) scheduler_addunlock(s, c->grav.drift, c->grav.mesh);
        if (periodic) scheduler_addunlock(s, c->grav.mesh, c->grav.down);
        scheduler_addunlock(s, c->grav.init, c->grav.long_range);
        scheduler_addunlock(s, c->grav.long_range, c->grav.down);
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        scheduler_addunlock(s, c->grav.down, c->grav.super->grav.end_force);
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        /* Link in the implicit tasks */
        scheduler_addunlock(s, c->grav.init, c->grav.init_out);
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        scheduler_addunlock(s, c->grav.drift, c->grav.drift_out);
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        scheduler_addunlock(s, c->grav.down_in, c->grav.down);
      }
    }
  }

  /* We are below the super-cell but not below the maximal splitting depth */
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  else if ((c->grav.super != NULL) &&
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           ((c->maxdepth - c->depth) >= space_subdepth_diff_grav)) {
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    /* Local tasks only... */
    if (c->nodeID == e->nodeID) {

      if (is_self_gravity) {

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        c->grav.drift_out = scheduler_addtask(s, task_type_drift_gpart_out,
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                                              task_subtype_none, 0, 1, c, NULL);
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        c->grav.init_out = scheduler_addtask(s, task_type_init_grav_out,
                                             task_subtype_none, 0, 1, c, NULL);

        c->grav.down_in = scheduler_addtask(s, task_type_grav_down_in,
                                            task_subtype_none, 0, 1, c, NULL);

        scheduler_addunlock(s, c->parent->grav.init_out, c->grav.init_out);
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        scheduler_addunlock(s, c->parent->grav.drift_out, c->grav.drift_out);
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        scheduler_addunlock(s, c->grav.down_in, c->parent->grav.down_in);
      }
    }
  }

  /* Recurse but not below the maximal splitting depth */
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  if (c->split && ((c->maxdepth - c->depth) >= space_subdepth_diff_grav))
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    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_make_hierarchical_tasks_gravity(e, c->progeny[k]);
}

/**
 * @brief Recursively add non-implicit star ghost tasks to a cell hierarchy.
 */
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/* void engine_add_stars_ghosts(struct engine *e, struct cell *c, */
/*                              struct task *stars_ghost_in, */
/*                              struct task *stars_ghost_out) { */

/*   /\* Abort as there are no star particles here? *\/ */
/*   if (c->stars.count_total == 0) return; */

/*   /\* If we have reached the leaf OR have to few particles to play with*\/ */
/*   if (!c->split || c->stars.count_total < engine_max_sparts_per_ghost) { */

/*     /\* Add the ghost task and its dependencies *\/ */
/*     struct scheduler *s = &e->sched; */
/*     c->stars.ghost = scheduler_addtask(s, task_type_stars_ghost, */
/*                                        task_subtype_none, 0, 0, c, NULL); */
/*     scheduler_addunlock(s, stars_ghost_in, c->stars.ghost); */
/*     scheduler_addunlock(s, c->stars.ghost, stars_ghost_out); */
/*   } else { */
/*     /\* Keep recursing *\/ */
/*     for (int k = 0; k < 8; k++) */
/*       if (c->progeny[k] != NULL) */
/*         engine_add_stars_ghosts(e, c->progeny[k], stars_ghost_in, */
/*                                 stars_ghost_out); */
/*   } */
/* } */
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/**
 * @brief Recursively add non-implicit ghost tasks to a cell hierarchy.
 */
void engine_add_ghosts(struct engine *e, struct cell *c, struct task *ghost_in,
                       struct task *ghost_out) {

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  /* Abort as there are no hydro particles here? */
  if (c->hydro.count_total == 0) return;

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  /* If we have reached the leaf OR have to few particles to play with*/
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  if (!c->split || c->hydro.count_total < engine_max_parts_per_ghost) {
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    /* Add the ghost task and its dependencies */
    struct scheduler *s = &e->sched;
    c->hydro.ghost =
        scheduler_addtask(s, task_type_ghost, task_subtype_none, 0, 0, c, NULL);
    scheduler_addunlock(s, ghost_in, c->hydro.ghost);
    scheduler_addunlock(s, c->hydro.ghost, ghost_out);
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  } else {
    /* Keep recursing */
    for (int k = 0; k < 8; k++)
      if (c->progeny[k] != NULL)
        engine_add_ghosts(e, c->progeny[k], ghost_in, ghost_out);
  }
}

/**
 * @brief Generate the hydro hierarchical tasks for a hierarchy of cells -
 * i.e. all the O(Npart) tasks -- hydro version
 *
 * Tasks are only created here. The dependencies will be added later on.
 *
 * Note that there is no need to recurse below the super-cell. Note also
 * that we only add tasks if the relevant particles are present in the cell.
 *
 * @param e The #engine.
 * @param c The #cell.
 */
void engine_make_hierarchical_tasks_hydro(struct engine *e, struct cell *c) {

  struct scheduler *s = &e->sched;
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  const int with_stars = (e->policy & engine_policy_stars);
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  const int with_feedback = (e->policy & engine_policy_feedback);
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  const int with_cooling = (e->policy & engine_policy_cooling);
  const int with_star_formation = (e->policy & engine_policy_star_formation);
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  /* Are we in a super-cell ? */
  if (c->hydro.super == c) {

    /* Add the sort task. */
    c->hydro.sorts =
        scheduler_addtask(s, task_type_sort, task_subtype_none, 0, 0, c, NULL);

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    if (with_feedback) {
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      c->stars.sorts = scheduler_addtask(s, task_type_stars_sort,
                                         task_subtype_none, 0, 0, c, NULL);
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    }
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    /* Local tasks only... */
    if (c->nodeID == e->nodeID) {

      /* Add the drift task. */
      c->hydro.drift = scheduler_addtask(s, task_type_drift_part,
                                         task_subtype_none, 0, 0, c, NULL);
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      /* Add the task finishing the force calculation */
      c->hydro.end_force = scheduler_addtask(s, task_type_end_hydro_force,
                                             task_subtype_none, 0, 0, c, NULL);
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      /* Generate the ghost tasks. */
      c->hydro.ghost_in =
          scheduler_addtask(s, task_type_ghost_in, task_subtype_none, 0,
                            /* implicit = */ 1, c, NULL);
      c->hydro.ghost_out =
          scheduler_addtask(s, task_type_ghost_out, task_subtype_none, 0,
                            /* implicit = */ 1, c, NULL);
      engine_add_ghosts(e, c, c->hydro.ghost_in, c->hydro.ghost_out);

      /* Generate the extra ghost task. */
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#ifdef EXTRA_HYDRO_LOOP
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      c->hydro.extra_ghost = scheduler_addtask(
          s, task_type_extra_ghost, task_subtype_none, 0, 0, c, NULL);
#endif

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      /* Stars */
      if (with_stars) {
	c->stars.drift = scheduler_addtask(s, task_type_drift_spart,
                                           task_subtype_none, 0, 0, c, NULL);
	if(!with_feedback) {
	  scheduler_addunlock(s, c->stars.drift, c->super->kick2);
	}
      }
      
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      /* Subgrid tasks: cooling */
      if (with_cooling) {

        c->hydro.cooling = scheduler_addtask(s, task_type_cooling,
                                             task_subtype_none, 0, 0, c, NULL);

        scheduler_addunlock(s, c->hydro.end_force, c->hydro.cooling);
        scheduler_addunlock(s, c->hydro.cooling, c->super->kick2);

      } else {
        scheduler_addunlock(s, c->hydro.end_force, c->super->kick2);
      }

      /* Subgrid tasks: star formation */
      if (with_star_formation) {

        c->hydro.star_formation = scheduler_addtask(
            s, task_type_star_formation, task_subtype_none, 0, 0, c, NULL);

        scheduler_addunlock(s, c->super->kick2, c->hydro.star_formation);
        scheduler_addunlock(s, c->hydro.star_formation, c->super->timestep);
      }

      /* Subgrid tasks: feedback */
      if (with_feedback) {

        c->stars.stars_in =
            scheduler_addtask(s, task_type_stars_in, task_subtype_none, 0,
                              /* implicit = */ 1, c, NULL);

        c->stars.stars_out =
            scheduler_addtask(s, task_type_stars_out, task_subtype_none, 0,
                              /* implicit = */ 1, c, NULL);

        c->stars.ghost = scheduler_addtask(s, task_type_stars_ghost,
                                           task_subtype_none, 0, 0, c, NULL);

        scheduler_addunlock(s, c->super->kick2, c->stars.stars_in);
        scheduler_addunlock(s, c->stars.stars_out, c->super->timestep);

        if (with_star_formation)
          scheduler_addunlock(s, c->hydro.star_formation, c->stars.stars_in);
      }
    }
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  } else { /* We are above the super-cell so need to go deeper */

    /* Recurse. */
    if (c->split)
      for (int k = 0; k < 8; k++)
        if (c->progeny[k] != NULL)
          engine_make_hierarchical_tasks_hydro(e, c->progeny[k]);
  }
}

/**
 * @brief Generate the stars hierarchical tasks for a hierarchy of cells -
 * i.e. all the O(Npart) tasks -- star version
 *
 * Tasks are only created here. The dependencies will be added later on.
 *
 * Note that there is no need to recurse below the super-cell. Note also
 * that we only add tasks if the relevant particles are present in the cell.
 *
 * @param e The #engine.
 * @param c The #cell.
 */
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/* void engine_make_hierarchical_tasks_stars(struct engine *e, struct cell *c) {
 */
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/*   struct scheduler *s = &e->sched; */

/*   /\* Are we in a super-cell ? *\/ */
/*   if (c->hydro.super == c) { */
/*     /\* Foreign tasks only *\/ */
/*     if (c->nodeID != e->nodeID) { */
/*       c->stars.sorts_foreign = scheduler_addtask( */
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/*           s, task_type_stars_sort_foreign, task_subtype_none, 0, 0, c, NULL);
 */
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/*     } */

/*     /\* Local tasks only... *\/ */
/*     if (c->nodeID == e->nodeID) { */
/*       c->stars.sorts_local = scheduler_addtask( */
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/*           s, task_type_stars_sort_local, task_subtype_none, 0, 0, c, NULL);
 */
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/*       /\* Generate the ghost tasks. *\/ */
/*       c->stars.ghost_in = */
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/*           scheduler_addtask(s, task_type_stars_ghost_in, task_subtype_none,
 * 0, */
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/*                             /\* implicit = *\/ 1, c, NULL); */
/*       c->stars.ghost_out = */
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/*           scheduler_addtask(s, task_type_stars_ghost_out, task_subtype_none,
 * 0, */
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/*                             /\* implicit = *\/ 1, c, NULL); */
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/*       engine_add_stars_ghosts(e, c, c->stars.ghost_in, c->stars.ghost_out);
 */
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/*       /\* Need to compute the gas density before moving to the feedback *\/
 */
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/*       scheduler_addunlock(s, c->hydro.super->hydro.ghost_out, */
/*                           c->hydro.super->stars.ghost_out); */
/*     } */
/*   } else { /\* We are above the super-cell so need to go deeper *\/ */

/*     /\* Recurse. *\/ */
/*     if (c->split) */
/*       for (int k = 0; k < 8; k++) */
/*         if (c->progeny[k] != NULL) */
/*           engine_make_hierarchical_tasks_stars(e, c->progeny[k]); */
/*   } */
/* } */
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/**
 * @brief Constructs the top-level tasks for the short-range gravity
 * and long-range gravity interactions.
 *
 * - All top-cells get a self task.
 * - All pairs within range according to the multipole acceptance
 *   criterion get a pair task.
 */
void engine_make_self_gravity_tasks_mapper(void *map_data, int num_elements,
                                           void *extra_data) {

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  struct engine *e = (struct engine *)extra_data;
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