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NAME
MPI_Isend - Starts a standard-mode, nonblocking send.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Isend(void *buf, int count, MPI_Datatype datatype, int dest,
int tag, MPI_Comm comm, MPI_Request *request)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_ISEND(BUF, COUNT, DATATYPE, DEST, TAG, COMM, REQUEST, IERROR)
<type> BUF(*)
INTEGER COUNT, DATATYPE, DEST, TAG, COMM, REQUEST, IERROR
C++ Syntax
#include <mpi.h>
Request Comm::Isend(const void* buf, int count, const
Datatype& datatype, int dest, int tag) const
INPUT PARAMETERS
buf Initial address of send buffer (choice).
count Number of elements in send buffer (integer).
datatype Datatype of each send buffer 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
MPI_Isend starts a standard-mode, nonblocking send. Nonblocking calls
allocate a communication request object and associate it with the
request handle (the argument request). The request can be used later to
query the status of the communication or wait for its completion.
A nonblocking send call indicates that the system may start copying
data out of the send buffer. The sender should not access any part of
the send buffer after a nonblocking send operation is called, until the
send completes.
A send request can be determined being completed by calling the
MPI_Wait, MPI_Waitany, MPI_Test, or MPI_Testany with request returned
by this function.
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 MPI_Wait MPI_Waitany MPI_Test MPI_Testany
Open MPI 1.2 March 2007 MPI_Isend(3OpenMPI)
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