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/*@@
@file Reduction.c
@date
@author Gabrielle Allen
@desc
This file contains routines to deal with registering and
using functions providing reduction operations.
@enddesc
@@*/
/*#define DEBUG_REDUCTION*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <stdarg.h>
#include "cctk.h"
#include "flesh.h"
#include "Groups.h"
#include "StoreHandledData.h"
#include "Reduction.h"
#include "WarnLevel.h"
static char *rcsid = "$Header$";
static cHandledData *ReductionOperators = NULL;
static int num_reductions = 0;
#define REGISTER_ARGLIST \
cGH *, \
int, \
int, \
int, \
void *, \
int, \
int *
/*@@
@routine CCTK_RegisterReductionOperator
@date April 28 1999
@author Gabrielle Allen
@desc
Registers "function" as a reduction operator called "name"
@enddesc
@var function
@vdesc Routine containing reduction operator
@vtype (void (*))
@vio
@vcomment
@endvar
@var name
@vdesc String containing name of reduction operator
@vtype const char *
@vio in
@vcomment
@endvar
@@*/
int CCTK_RegisterReductionOperator(void (*function)(REGISTER_ARGLIST),
const char *name)
{
int handle;
/* Check that the method hasn't already been registered */
handle = CCTK_GetHandle(ReductionOperators, name, NULL);
if(handle < 0)
{
/* Get a handle for it. */
handle = CCTK_NewHandle(&ReductionOperators, name, (void *)function);
/* Remember how many reduction operators there are */
num_reductions++;
}
else
{
/* Reduction operator with this name already exists. */
CCTK_Warn(1,"CCTK","Reduction operator with this name already exists");
handle = -1;
}
#ifdef DEBUG_REDUCTION
printf("----------------------------------------------------------------\n");
printf("In CCTK_RegisterReductionOperator\n");
printf("---------------------------------\n");
printf(" Registering %s with handle %d\n",name,handle);
printf("----------------------------------------------------------------\n");
#endif
return handle;
}
int CCTK_GetReductionHandle(const char *reduction)
{
int handle;
void **data=NULL; /* isn't used here */
handle = CCTK_GetHandle(ReductionOperators, reduction, data);
#ifdef DEBUG_REDUCTION
printf("----------------------------------------------------------------\n");
printf("In CCTK_GetReductionHandle\n");
printf("--------------------------\n");
printf(" Got handle %d for %s\n",handle,reduction);
printf("----------------------------------------------------------------\n");
#endif
if (handle < 0)
CCTK_Warn(1,"CCTK","No handle found for this reduction operator");
return handle;
}
int CCTK_Reduce(cGH *GH, int retvartype, int retvarnum, void *retval,
int operation_handle, int index, ...)
{
va_list indices;
int invarnum;
int *index_array;
void (*function)(REGISTER_ARGLIST);
/* Fill in the array of variable indices from the variable argument list */
invarnum = 1;
index_array = (int *)malloc(sizeof(int));
index_array[0] = index;
va_start(indices, index);
invarnum++;
index_array = (int *)realloc(index_array,invarnum*sizeof(int));
index_array[invarnum-1] = index;
va_end(indices);
/* Get the pointer to the reduction operator */
function = (void (*)(REGISTER_ARGLIST))
CCTK_GetHandledData(ReductionOperators,operation_handle);
/* Call the function providing the reduction, if it exists */
/* FIX ME : Generalise (GAB) */
if (function)
{
function(GH,-1,CCTK_VARIABLE_REAL,retvarnum,retval,invarnum,index_array);
}
else
CCTK_Warn(1,"CCTK","Reduction operation is not registered and cannot be called");
if (index_array) free(index_array);
return 1;
}
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