distances.h

/*
 * SPDX-License-Identifier: BSD-3-Clause
 * Copyright © 2010-2025 Inria.  All rights reserved.
 * See COPYING in top-level directory.
 */

 
#ifndef HWLOC_DISTANCES_H
#define HWLOC_DISTANCES_H
 
#ifndef HWLOC_H
#error Please include the main hwloc.h instead
#endif
 
 
#ifdef __cplusplus
extern "C" {
#elif 0
}
#endif
 


struct hwloc_distances_s {
  unsigned nbobjs;              
  hwloc_obj_t *objs;            
  unsigned long kind;           
  hwloc_uint64_t *values;       
};

enum hwloc_distances_kind_e {
  HWLOC_DISTANCES_KIND_FROM_OS = (1UL<<0),
  HWLOC_DISTANCES_KIND_FROM_USER = (1UL<<1),

  HWLOC_DISTANCES_KIND_MEANS_LATENCY = (1UL<<2),
  HWLOC_DISTANCES_KIND_MEANS_BANDWIDTH = (1UL<<3),

  HWLOC_DISTANCES_KIND_HETEROGENEOUS_TYPES = (1UL<<4)
};

HWLOC_DECLSPEC int
hwloc_distances_get(hwloc_topology_t topology,
                    unsigned *nr, struct hwloc_distances_s **distances,
                    unsigned long kind, unsigned long flags);

HWLOC_DECLSPEC int
hwloc_distances_get_by_depth(hwloc_topology_t topology, int depth,
                             unsigned *nr, struct hwloc_distances_s **distances,
                             unsigned long kind, unsigned long flags);

HWLOC_DECLSPEC int
hwloc_distances_get_by_type(hwloc_topology_t topology, hwloc_obj_type_t type,
                            unsigned *nr, struct hwloc_distances_s **distances,
                            unsigned long kind, unsigned long flags);

HWLOC_DECLSPEC int
hwloc_distances_get_by_name(hwloc_topology_t topology, const char *name,
                            unsigned *nr, struct hwloc_distances_s **distances,
                            unsigned long flags);

HWLOC_DECLSPEC const char *
hwloc_distances_get_name(hwloc_topology_t topology, struct hwloc_distances_s *distances);

HWLOC_DECLSPEC void
hwloc_distances_release(hwloc_topology_t topology, struct hwloc_distances_s *distances);

enum hwloc_distances_transform_e {
  HWLOC_DISTANCES_TRANSFORM_REMOVE_NULL = 0,

  HWLOC_DISTANCES_TRANSFORM_LINKS = 1,

  HWLOC_DISTANCES_TRANSFORM_MERGE_SWITCH_PORTS = 2,

  HWLOC_DISTANCES_TRANSFORM_TRANSITIVE_CLOSURE = 3
};

HWLOC_DECLSPEC int hwloc_distances_transform(hwloc_topology_t topology, struct hwloc_distances_s *distances,
                                             enum hwloc_distances_transform_e transform,
                                             void *transform_attr,
                                             unsigned long flags);

 
 


static __hwloc_inline int
hwloc_distances_obj_index(struct hwloc_distances_s *distances, hwloc_obj_t obj)
{
  unsigned i;
  for(i=0; i<distances->nbobjs; i++)
    if (distances->objs[i] == obj)
      return (int)i;
  return -1;
}

static __hwloc_inline int
hwloc_distances_obj_pair_values(struct hwloc_distances_s *distances,
                                hwloc_obj_t obj1, hwloc_obj_t obj2,
                                hwloc_uint64_t *value1to2, hwloc_uint64_t *value2to1)
{
  int i1 = hwloc_distances_obj_index(distances, obj1);
  int i2 = hwloc_distances_obj_index(distances, obj2);
  if (i1 < 0 || i2 < 0)
    return -1;
  *value1to2 = distances->values[i1 * distances->nbobjs + i2];
  *value2to1 = distances->values[i2 * distances->nbobjs + i1];
  return 0;
}

 
 


typedef void * hwloc_distances_add_handle_t;

HWLOC_DECLSPEC hwloc_distances_add_handle_t
hwloc_distances_add_create(hwloc_topology_t topology,
                           const char *name, unsigned long kind,
                           unsigned long flags);

HWLOC_DECLSPEC int hwloc_distances_add_values(hwloc_topology_t topology,
                                              hwloc_distances_add_handle_t handle,
                                              unsigned nbobjs, hwloc_obj_t *objs,
                                              hwloc_uint64_t *values,
                                              unsigned long flags);

enum hwloc_distances_add_flag_e {
  HWLOC_DISTANCES_ADD_FLAG_GROUP = (1UL<<0),
  HWLOC_DISTANCES_ADD_FLAG_GROUP_INACCURATE = (1UL<<1)
};

HWLOC_DECLSPEC int hwloc_distances_add_commit(hwloc_topology_t topology,
                                              hwloc_distances_add_handle_t handle,
                                              unsigned long flags);

 
 


HWLOC_DECLSPEC int hwloc_distances_remove(hwloc_topology_t topology);

HWLOC_DECLSPEC int hwloc_distances_remove_by_depth(hwloc_topology_t topology, int depth);

static __hwloc_inline int
hwloc_distances_remove_by_type(hwloc_topology_t topology, hwloc_obj_type_t type)
{
  int depth = hwloc_get_type_depth(topology, type);
  if (depth == HWLOC_TYPE_DEPTH_UNKNOWN || depth == HWLOC_TYPE_DEPTH_MULTIPLE)
    return 0;
  return hwloc_distances_remove_by_depth(topology, depth);
}

HWLOC_DECLSPEC int hwloc_distances_release_remove(hwloc_topology_t topology, struct hwloc_distances_s *distances);

 
 
#ifdef __cplusplus
} /* extern "C" */
#endif
 
 
#endif /* HWLOC_DISTANCES_H */