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MPI_Mprobe - Blocking matched probe for a message.
#include <mpi.h>
int MPI_Mprobe(int source, int tag, MPI_Comm comm,
MPI_Message *message, MPI_Status *status)
INCLUDE ’mpif.h’
MPI_MPROBE(SOURCE, TAG, COMM, MESSAGE, STATUS, IERROR)
INTEGER SOURCE, TAG, COMM, MESSAGE
INTEGER STATUS(MPI_STATUS_SIZE), IERROR
There is no C++ binding for this function.
- source
- Source rank or MPI_ANY_SOURCE (integer).
- tag
- Tag
value or MPI_ANY_TAG (integer).
- comm
- Communicator (handle).
- 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 opera- tions 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 message = MPI_MESSAGE_NULL,
and the status object returns source = MPI_PROC_NULL, tag = MPI_ANY_TAG,
and count = 0.
When MPI_Mprobe returns (from a non-MPI_PROC_NULL source),
the matched message can then be received by passing the message handle
to the MPI_Mrecv or MPI_Imrecv functions.
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_Improbe
MPI_Probe
MPI_Iprobe
MPI_Mrecv
MPI_Imrecv
MPI_Cancel
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