- Non-blocking matched probe for a message.
int MPI_Improbe(int source, int tag, MPI_Comm comm,
int *flag, MPI_Message *message, MPI_Status *status)
MPI_IMPROBE( SOURCE, TAG, COMM, FLAG, MESSAGE, STATUS, IERROR)
INTEGER SOURCE, TAG, COMM, MESSAGE
INTEGER STATUS(MPI_STATUS_SIZE), IERROR
There is no C++ binding for this function.
- Source rank or MPI_ANY_SOURCE (integer).
- Tag value or MPI_ANY_TAG (integer).
- Communicator (handle).
- Flag (logical).
- Message (handle).
- Status object (status).
- Fortran only: Error status (integer).
Like MPI_Probe and MPI_Iprobe, the MPI_Mprobe and MPI_Improbe operations allow
incoming messages to be queried without actually receiving them, except that
MPI_Mprobe and MPI_Improbe provide a mechanism to receive the specific message
that was matched regardless of other intervening probe or receive operations.
This gives the application an opportunity to decide how to receive the
message, based on the information returned by the probe. In particular, the
application may allocate memory for the receive buffer according to the length
of the probed message.
A matching probe with MPI_PROC_NULL as source
= MPI_MESSAGE_NO_PROC, and the status
source = MPI_PROC_NULL, tag = MPI_ANY_TAG, and count = 0.
MPI_Iprobe returns a true value in flag
if a message has been matched and
can be received by passing the message
handle to the MPI_Mrecv or
MPI_Imrecv functions, provided the source
was not MPI_PROC_NULL.
This is an MPI-3 function and has no C++ binding.
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
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.