# Name

`MPI_Bsend_init` - Builds a handle for a buffered send.

# Syntax

## C Syntax

```c
#include <mpi.h>

int MPI_Bsend_init(const void *buf, int count, MPI_Datatype datatype,
	int dest, int tag, MPI_Comm comm, MPI_Request *request)
```

## Fortran Syntax

```fortran
USE MPI
! or the older form: INCLUDE 'mpif.h'

MPI_BSEND_INIT(BUF, COUNT, DATATYPE, DEST, TAG, COMM, REQUEST, IERROR)
    <type>	BUF(*)
    INTEGER	COUNT, DATATYPE, DEST, TAG,
    INTEGER	COMM, REQUEST, IERROR
```

## Fortran 2008 Syntax

```fortran
USE mpi_f08

MPI_Bsend_init(buf, count, datatype, dest, tag, comm, request, ierror)
    TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: buf
    INTEGER, INTENT(IN) :: count, dest, tag
    TYPE(MPI_Datatype), INTENT(IN) :: datatype
    TYPE(MPI_Comm), INTENT(IN) :: comm
    TYPE(MPI_Request), INTENT(OUT) :: request
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror
```

# Input Parameters

* `buf` : Initial address of send buffer (choice).
* `count` : Number of elements sent (integer).
* `datatype` : Type of each element (handle).
* `dest` : Rank of destination (integer).
* `tag` : Message tag (integer).
* `comm` : Communicator (handle).

# Output Parameters

* `request` : Communication request (handle).
* `IERROR` : Fortran only: Error status (integer).

# Description

Creates a persistent communication `request` for a buffered mode send, and
binds to it all the arguments of a send operation.

A communication (send or receive) that uses a persistent `request` is
initiated by the function `MPI_Start`.


# Errors

Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument.

Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for
I/O function errors. The error handler may be changed with
`MPI_Comm_set_errhandler`; the predefined error handler `MPI_ERRORS_RETURN`
may be used to cause error values to be returned. Note that MPI does not
guarantee that an MPI program can continue past an error.


# See Also

[MPI_Send_init(3)](MPI_Send_init.html)
[MPI_Ssend_init(3)](MPI_Ssend_init.html)
[MPI_Rsend_init(3)](MPI_Rsend_init.html)
[MPI_Recv_init(3)](MPI_Recv_init.html)
[MPI_Start(3)](MPI_Start.html)
[MPI_Startall(3)](MPI_Startall.html)