Tests for completion of any previdously initiated communication
int MPI_Testany( count, array_of_requests, index, flag, status )
int *index, *flag;
- count - list length (integer)
- array_of_requests - array of requests (array of handles)
- index - index of operation that completed, or MPI_UNDEFINED if none
- flag - true if one of the operations is complete (logical)
- status - status object (Status)
Note on status for send operations
For send operations, the only use of status is for MPI_Test_cancelled or
in the case that there is an error, in which case the MPI_ERROR field of
status will be set.
Notes for Fortran
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) have
an additional argument ierr at the end of the argument list. ierr
is an integer and has the same meaning as the return value of the routine
in C. In Fortran, MPI routines are subroutines, and are invoked with the
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER
All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value;
C routines as the value of the function and Fortran routines in the last
argument. Before the value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job. The error handler
may be changed with MPI_Errhandler_set; the predefined error handler
MPI_ERRORS_RETURN may be used to cause error values to be returned.
Note that MPI does not guarentee that an MPI program can continue past
- MPI_SUCCESS - No error; MPI routine completed successfully.
- MPI_ERR_IN_STATUS - The actual error value is in the MPI_Status argument.
This error class is returned only from the multiple-completion routines
(MPI_Testall, MPI_Testany, MPI_Testsome, MPI_Waitall, MPI_Waitany,
and MPI_Waitsome). The field MPI_ERROR in the status argument
contains the error value or MPI_SUCCESS (no error and complete) or
MPI_ERR_PENDING to indicate that the request has not completed.