MPI_Testany
Tests for completion of any previdously initiated communication
Synopsis
int MPI_Testany(int count, MPI_Request array_of_requests[], int *index, int *flag, MPI_Status *status)
Input Parameters
- count
- list length (integer)
- array_of_requests
- array of requests (array of handles)
Output Parameters
- index
- index of operation that completed, or MPI_UNDEFINED if none
completed (integer)
- flag
- true if one of the operations is complete (logical)
- status
- status object (Status). May be MPI_STATUS_IGNORE.
Notes
While it is possible to list a request handle more than once in the
array_of_requests, such an action is considered erroneous and may cause the
program to unexecpectedly terminate or produce incorrect results.
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
call statement.
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER
in Fortran.
Errors
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
an error.
- MPI_SUCCESS
- No error; MPI routine completed successfully.
Location:testany.c