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/* Some constants. */
#define space_maxdepth                  10
#define space_cellallocchunk            1000
#define space_splitratio                0.875
#define space_splitsize                 800
#define task_maxwait                    3
#define task_maxunlock                  39


/* Map shift vector to sortlist. */
extern const int sortlistID[27];
    
    
/* The different task IDs. */
enum taskIDs {
    tid_none = 0,
    tid_sort,
    tid_self,
    tid_pair,
    tid_sub,
    tid_count
    };
extern const char *taskID_names[];
    
    
/* Data of a task. */
struct task {

    int type, flags, wait, rank, done;
    
    int nr_unlock_tasks;
    struct task *unlock_tasks[ task_maxunlock ];

    int nr_unlock_cells;
    struct cell *ci, *cj, *unlock_cells[2];
    
    } __attribute__((aligned (64)));


/* Entry in a list of sorted indices. */
struct entry {
    float d;
    int i;
    };
    
    
/* Data of a single particle. */
struct part {

    /* Particle position. */
    double x[3];
    
    /* Particle cutoff radius. */
    float r;
    
    /* Particle time-step. */
    float dt;
    
    /* Particle ID. */
    int id;
    
    /* Number of pairwise interactions. */
    float count;
    int icount;
    
    } __attribute__((aligned (32)));
    

/* Structure to store the data of a single cell. */
struct cell {

    /* The cell location on the grid. */
    double loc[3];
    
    /* The cell dimensions. */
    double h[3];
    
    /* Max radii in this cell. */
    double r_max;
    
    /* The depth of this cell in the tree. */
    int depth, split;
    
    /* Nr of parts. */
    int count;
    
    /* Pointers to the particle data. */
    struct part *parts;
    
    /* Pointers for the sorted indices. */
    struct entry *sort;
    
    /* Number of pairs associated with this cell. */
    int nr_pairs;
    
    /* Pointers to the next level of cells. */
    struct cell *progeny[8];
    
    /* Parent cell. */
    struct cell *parent;
    
    /* The tasks computing this cell's sorts. */
    struct task *sorts[14];
    
    /* Number of tasks this cell is waiting for and whether it is in use. */
    int wait;
    
    /* Is the data of this cell being used in a sub-cell? */
    int hold;
    
    /* Spin lock for various uses. */
    lock_type lock;
    
    /* Linking pointer for "memory management". */
    struct cell *next;

    } __attribute__((aligned (64)));


/* The space in which the cells reside. */
struct space {

    /* Spatial extent. */
    double dim[3];
    
    /* Cell widths. */
    double h[3], ih[3];
    
    /* The minimum and maximum cutoff radii. */
    double r_min, r_max;
    
    /* Number of cells. */
    int nr_cells, tot_cells;
    
    /* Space dimensions in number of cells. */
    int maxdepth, cdim[3];
    
    /* The (level 0) cells themselves. */
    struct cell *cells;
    
    /* Buffer of unused cells. */
    struct cell *cells_new;
    
    /* The particle data (cells have pointers to this). */
    struct part *parts;
    
    /* The sortlist data (cells hold pointers to these). */
    struct entry *sortlist;
    
    /* The total number of parts in the space. */
    int nr_parts;
    
    /* Is the space periodic? */
    int periodic;
    
    /* The list of tasks. */
    struct task *tasks;
    int nr_tasks, next_task;
    int *tasks_ind;
    lock_type task_lock;
    
    };


/* function prototypes. */
struct cell *space_getcell ( struct space *s );
struct task *space_gettask ( struct space *s );
void space_init ( struct space *s , double dim[3] , struct part *parts , int N , int periodic , double h_max );
void space_maketasks ( struct space *s , int do_sort );
void space_map_cells ( struct space *s , void (*fun)( struct cell *c , void *data ) , void *data );
void space_map_parts ( struct space *s , void (*fun)( struct part *p , struct cell *c , void *data ) , void *data );
void space_recycle ( struct space *s , struct cell *c );