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#include "Bdef.h"
BLACBUFF *BI_Pack(BLACSCONTEXT *ctxt, BVOID *A, BLACBUFF *bp,
BI_MPI_Datatype Dtype)
{
BLACBUFF *BI_GetBuff(int);
int i, info, one=1;
BI_MPI_Aint eltsiz;
#ifdef ZeroByteTypeBug
char *cptr;
extern BLACBUFF BI_AuxBuff;
extern int BI_Np;
#endif
/*
* Some versions of mpich and its derivitives cannot handle 0 byte typedefs,
* so we have set MPI_BYTE as a flag for a 0 byte message
*/
#ifdef ZeroByteTypeBug
if (Dtype == BI_MPI_BYTE)
{
info = sizeof(BLACBUFF);
if (info % sizeof(BI_MPI_Request))
info += sizeof(BI_MPI_Request) - info % sizeof(BI_MPI_Request);
i = info + BI_Np*sizeof(BI_MPI_Request);
if (i % BUFFALIGN) i += BUFFALIGN - i % BUFFALIGN;
cptr = malloc(i);
if (cptr)
{
bp = (BLACBUFF *) cptr;
bp->Len = bp->N = bp->nAops = 0;
bp->Aops = (BI_MPI_Request *) &cptr[info];
bp->Buff = (char *) &bp->Len;
bp->dtype = BI_MPI_BYTE;
return(bp);
}
else BI_BlacsErr(BI_ContxtNum(ctxt), __LINE__, __FILE__,
"Not enough memory to allocate 0 byte buffer\n");
}
#endif
if (bp == NULL)
{
BI_MPI_Pack_size(one, Dtype, ctxt->scp->comm, &i, info);
bp = BI_GetBuff(i);
}
i = 0;
BI_MPI_Pack(A, one, Dtype, bp->Buff, bp->Len, &i, ctxt->scp->comm, info);
bp->dtype = BI_MPI_PACKED;
bp->N = i;
return(bp);
}
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