-/* -*- mode: c; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; c-file-style: "stroustrup"; -*-
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-/*! \file groupcoord.h
- *
- * @brief Assemble atom positions for comparison with a reference set.
+/*! \libinternal \file
+ * \brief Assemble atomic positions of a (small) subset of atoms and distribute to all nodes.
*
* This file contains functions to assemble the positions of a subset of the
* atoms and to do operations on it like determining the center of mass, or
* a subset of the positions needs to be compared to some set of reference
* positions, as e.g. done for essential dynamics.
*
+ * \inlibraryapi
*/
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
#include <stdio.h>
-#include "typedefs.h"
-#include "types/commrec.h"
+#include "gromacs/legacyheaders/typedefs.h"
+#include "gromacs/legacyheaders/types/commrec.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
/*! \brief Select local atoms of a group.
*
* (collective) array such that it can be gmx_summed
* in the communicate_group_positions routine.
*/
+
extern void dd_make_local_group_indices(gmx_ga2la_t ga2la,
const int nr, int anrs[], int *nr_loc,
int *anrs_loc[], int *nalloc_loc,
* retrieved from anrs_loc[0..nr_loc]. If you call the routine for the serial case,
* provide an array coll_ind[i] = i for i in 1..nr.
*
+ * If shifts != NULL, the PBC representation of each atom is chosen such that a
+ * continuous trajectory results. Therefore, if the group is whole at the start
+ * of the simulation, it will always stay whole.
+ * If shifts = NULL, the group positions are not made whole again, but assembled
+ * and distributed to all nodes. The variables marked "optional" are not used in
+ * that case.
+ *
* \param[in] cr Pointer to MPI communication data.
- * \param[out] xcoll Collective array of positions, idential on all nodes
+ * \param[out] xcoll Collective array of positions, identical on all nodes
* after this routine has been called.
* \param[in,out] shifts Collective array of shifts for xcoll, needed to make
* the group whole. This array remembers the shifts
* since the start of the simulation (where the group
* is whole) and must therefore not be changed outside
- * of this routine!
+ * of this routine! If NULL, the group will not be made
+ * whole and the optional variables are ignored.
* \param[out] extra_shifts Extra shifts since last time step, only needed as
- * buffer variable [0..nr].
- * \param[in] bNS Neighborsearching/domain redecomposition has been
+ * buffer variable [0..nr] (optional).
+ * \param[in] bNS Neighbor searching / domain re-decomposition has been
* performed at the begin of this time step such that
- * the shifts have changed and need to be updated.
+ * the shifts have changed and need to be updated
+ * (optional).
* \param[in] x_loc Pointer to the local atom positions this node has.
* \param[in] nr Total number of atoms in the group.
* \param[in] nr_loc Number of group atoms on the local node.
* contributions can be gmx_summed. It is provided by
* dd_make_local_group_indices.
* \param[in,out] xcoll_old Positions from the last time step, used to make the
- * group whole.
+ * group whole (optional).
* \param[in] box Simulation box matrix, needed to shift xcoll such that
- * the group becomes whole.
+ * the group becomes whole (optional).
*/
extern void communicate_group_positions(t_commrec *cr, rvec *xcoll, ivec *shifts,
ivec *extra_shifts, const gmx_bool bNS,
int *anrs_loc, int *coll_ind, rvec *xcoll_old,
matrix box);
-
/*! \brief Calculates the center of the positions x locally.
*
* Calculates the center of mass (if masses are given in the weight array) or
*
*/
extern void rotate_x(rvec x[], const int nr, matrix rmat);
+
+#ifdef __cplusplus
+}
+#endif