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#include "Bdef.h"
#if (INTFACE == C_CALL)
Int Csys2blacs_handle(MPI_Comm SysCtxt)
#else
Int sys2blacs_handle_(Int *SysCtxt)
#endif
{
#if (INTFACE == C_CALL)
Int i, j, DEF_WORLD;
MPI_Comm *tSysCtxt;
extern Int BI_MaxNSysCtxt;
extern MPI_Comm *BI_SysContxts;
if (BI_COMM_WORLD == NULL)
Cblacs_pinfo(&i, &j);
if (SysCtxt == MPI_COMM_NULL)
BI_BlacsErr(-1, __LINE__, __FILE__,
"Cannot define a BLACS system handle based on MPI_COMM_NULL");
/*
* See if we already have this system handle stored
*/
for (i=0; i < BI_MaxNSysCtxt; i++)
if (BI_SysContxts[i] == SysCtxt) return(i);
/*
* The first time in this routine, we need to define MPI_COMM_WORLD, if it isn't
* what is already being defined.
*/
DEF_WORLD = ( (!BI_SysContxts) && (SysCtxt != MPI_COMM_WORLD) );
/*
* Find free slot in system context array
*/
for (i=0; i < BI_MaxNSysCtxt; i++)
if (BI_SysContxts[i] == MPI_COMM_NULL) break;
/*
* If needed, get a bigger system context array
*/
if (i == BI_MaxNSysCtxt)
{
j = BI_MaxNSysCtxt + MAXNSYSCTXT;
if ( (MAXNSYSCTXT == 1) && (DEF_WORLD) ) j++;
tSysCtxt = (MPI_Comm *) malloc(j * sizeof(MPI_Comm));
for (i=0; i < BI_MaxNSysCtxt; i++) tSysCtxt[i] = BI_SysContxts[i];
BI_MaxNSysCtxt = j;
for (j=i; j < BI_MaxNSysCtxt; j++) tSysCtxt[j] = MPI_COMM_NULL;
if (BI_SysContxts) free(BI_SysContxts);
BI_SysContxts = tSysCtxt;
}
if (DEF_WORLD) BI_SysContxts[i++] = MPI_COMM_WORLD;
BI_SysContxts[i] = SysCtxt;
return(i);
#else
return(*SysCtxt);
#endif
}
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