File: MPI_Recv.3

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.TH MPI_Recv 3 "1/6/1997" " " "MPI"
.SH NAME
MPI_Recv \-  Basic receive 
.SH SYNOPSIS
.nf
#include "mpi.h"
int MPI_Recv( buf, count, datatype, source, tag, comm, status )
void             *buf;
int              count, source, tag;
MPI_Datatype     datatype;
MPI_Comm         comm;
MPI_Status       *status;
.fi
.SH OUTPUT PARAMETERS
.PD 0
.TP
.B buf 
- initial address of receive buffer (choice) 
.PD 1
.PD 0
.TP
.B status 
- status object (Status) 
.PD 1

.SH INPUT PARAMETERS
.PD 0
.TP
.B count 
- maximum number of elements in receive buffer (integer) 
.PD 1
.PD 0
.TP
.B datatype 
- datatype of each receive buffer element (handle) 
.PD 1
.PD 0
.TP
.B source 
- rank of source (integer) 
.PD 1
.PD 0
.TP
.B tag 
- message tag (integer) 
.PD 1
.PD 0
.TP
.B comm 
- communicator (handle) 
.PD 1

.SH NOTES
The 
.I count
argument indicates the maximum length of a message; the actual
number can be determined with 
.I MPI_Get_count
.

.SH NOTES FOR FORTRAN
All MPI routines in Fortran (except for 
.I MPI_WTIME
and 
.I MPI_WTICK
) have
an additional argument 
.I ierr
at the end of the argument list.  
.I ierr
is an integer and has the same meaning as the return value of the routine
in C.  In Fortran, MPI routines are subroutines, and are invoked with the
.I call
statement.

All MPI objects (e.g., 
.I MPI_Datatype
, 
.I MPI_Comm
) are of type 
.I INTEGER
in Fortran.

.SH ERRORS

All MPI routines (except 
.I MPI_Wtime
and 
.I MPI_Wtick
) return an error value;
C routines as the value of the function and Fortran routines in the last
argument.  Before the value is returned, the current MPI error handler is
called.  By default, this error handler aborts the MPI job.  The error handler
may be changed with 
.I MPI_Errhandler_set
; the predefined error handler
.I MPI_ERRORS_RETURN
may be used to cause error values to be returned.
Note that MPI does 
.B not
guarentee that an MPI program can continue past
an error.

.PD 0
.TP
.B MPI_SUCCESS 
- No error; MPI routine completed successfully.
.PD 1
.PD 0
.TP
.B MPI_ERR_COMM 
- Invalid communicator.  A common error is to use a null
communicator in a call (not even allowed in 
.I MPI_Comm_rank
).
.PD 1
.PD 0
.TP
.B MPI_ERR_TYPE 
- Invalid datatype argument.  May be an uncommitted 
.PD 1
MPI_Datatype (see 
.I MPI_Type_commit
).
.PD 0
.TP
.B MPI_ERR_COUNT 
- Invalid count argument.  Count arguments must be 
non-negative; a count of zero is often valid.
.PD 1
.PD 0
.TP
.B MPI_ERR_TAG 
- Invalid tag argument.  Tags must be non-negative; tags
in a receive (
.I MPI_Recv
, 
.I MPI_Irecv
, 
.I MPI_Sendrecv
, etc.) may
also be 
.I MPI_ANY_TAG
.  The largest tag value is available through the 
the attribute 
.I MPI_TAG_UB
.
.PD 1
.PD 0
.TP
.B MPI_ERR_RANK 
- Invalid source or destination rank.  Ranks must be between
zero and the size of the communicator minus one; ranks in a receive
(
.I MPI_Recv
, 
.I MPI_Irecv
, 
.I MPI_Sendrecv
, etc.) may also be 
.I MPI_ANY_SOURCE
.
.PD 1

.SH LOCATION
recv.c