Tests for the completion of a send or receive
int MPI_Test ( request, flag, status )
- communication request (handle)
|flag ||true if operation completed (logical)
|status ||status object (Status)
Note on status for send operations
For send operations, the only use of status is for MPI_Test_cancelled
orin the case that there is an error, in which case the MPI_ERROR field
ofstatus will be set.
Notes for Fortran
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK)
havean additional argument ierr at the end of the argument list.
ierris an integer and has the same meaning as the return value of the
routinein C. In Fortran, MPI routines are subroutines, and are invoked with
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type
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
lastargument. Before the value is returned, the current MPI error handler
iscalled. By default, this error handler aborts the MPI job. The error
handlermay be changed with MPI_Errhandler_set; the predefined error
handlerMPI_ERRORS_RETURN may be used to cause error values to be returned.
Note that MPI does not guarentee that an MPI program can continue
- No error; MPI routine completed successfully.
- Invalid MPI_Request. Either null or, in the case of a
MPI_Start or MPI_Startall, not a persistent request.
- Invalid argument. Some argument is invalid and is not
identified by a specific error class (e.g., MPI_ERR_RANK).