Builds a handle for a receive
int MPI_Recv_init( void *buf, int count, MPI_Datatype datatype, int source,
int tag, MPI_Comm comm, MPI_Request *request )
|buf ||initial address of receive buffer (choice)
|count ||number of elements received (integer)
|datatype ||type of each element (handle)
|source ||rank of source or MPI_ANY_SOURCE (integer)
|tag ||message tag or MPI_ANY_TAG (integer)
|comm ||communicator (handle)
- communication request (handle)
Notes for Fortran
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) have
an additional argument ierr at the end of the argument list. 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
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER
All MPI routines (except MPI_Wtime and 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 MPI_Errhandler_set; the predefined error handler
MPI_ERRORS_RETURN may be used to cause error values to be returned.
Note that MPI does not guarentee that an MPI program can continue past
- No error; MPI routine completed successfully.
- Invalid count argument. Count arguments must be
non-negative; a count of zero is often valid.
- Invalid datatype argument. May be an uncommitted
MPI_Datatype (see MPI_Type_commit).
- Invalid source or destination rank. Ranks must be between
zero and the size of the communicator minus one; ranks in a receive
(MPI_Recv, MPI_Irecv, MPI_Sendrecv, etc.) may also be MPI_ANY_SOURCE.
- Invalid tag argument. Tags must be non-negative; tags
in a receive (MPI_Recv, MPI_Irecv, MPI_Sendrecv, etc.) may
also be MPI_ANY_TAG. The largest tag value is available through the
the attribute MPI_TAG_UB.
- Invalid communicator. A common error is to use a null
communicator in a call (not even allowed in MPI_Comm_rank).
- This error is returned when some part of the MPICH
implementation is unable to acquire memory.