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MPI_Improbe - Non-blocking matched probe for a message.
#include <mpi.h>
int MPI_Improbe(int source, int tag, MPI_Comm comm,
int *flag, MPI_Message *message, MPI_Status *status)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_IMPROBE(SOURCE, TAG, COMM, FLAG, MESSAGE, STATUS, IERROR)
LOGICAL FLAG
INTEGER SOURCE, TAG, COMM, MESSAGE
INTEGER STATUS(MPI_STATUS_SIZE), IERROR
USE mpi_f08
MPI_Improbe(source, tag, comm, flag, message, status, ierror)
INTEGER, INTENT(IN) :: source, tag
TYPE(MPI_Comm), INTENT(IN) :: comm
INTEGER, INTENT(OUT) :: flag
TYPE(MPI_Message), INTENT(OUT) :: message
TYPE(MPI_Status) :: status
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- source
- Source rank or MPI_ANY_SOURCE (integer).
- tag
- Tag
value or MPI_ANY_TAG (integer).
- comm
- Communicator (handle).
- flag
- Flag (logical).
- message
- Message (handle).
- status
- Status object (status).
- IERROR
- 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 returns flag = true, message
= MPI_MESSAGE_NO_PROC, and the status object returns 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 return errors.
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_Mprobe
MPI_Probe
MPI_Iprobe
MPI_Mrecv
MPI_Imrecv
MPI_Cancel
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