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MPI_Issend - Starts a nonblocking synchronous send.
#include <mpi.h>
int MPI_Issend(const void *buf, int count, MPI_Datatype datatype, int dest,
int tag, MPI_Comm comm, MPI_Request *request)
INCLUDE ’mpif.h’
MPI_ISSEND(BUF, COUNT, DATATYPE, DEST, TAG, COMM, REQUEST, IERROR)
<type> BUF(*)
INTEGER COUNT, DATATYPE, DEST, TAG, COMM, REQUEST, IERROR
#include <mpi.h>
Request Comm::Issend(const void* buf, int count, const
Datatype& datatype, int dest, int tag) const
- 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).
- request
- Communication request
(handle).
- IERROR
- Fortran only: Error status (integer).
Starts
a synchronous 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 modify
any part of the send buffer after a nonblocking send operation is called,
until the send completes.
Almost all MPI routines return an error
value; C routines as the value of the function and Fortran routines in
the last argument. C++ functions do not return errors. If the default error
handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception
mechanism will be used to throw an MPI::Exception object.
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.
MPI_Ssend
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