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MPI_Is_thread_main - Determines if thread called MPI_Init
#include <mpi.h>
int MPI_Is_thread_main(int *flag)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_IS_THREAD_MAIN(FLAG, IERROR)
LOGICAL FLAG
INTEGER IERROR
USE mpi_f08
MPI_Is_thread_main(flag, ierror)
LOGICAL, INTENT(OUT) :: flag
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- flag
- True if calling thread is main thread (boolean).
- IERROR
- Fortran only: Error status (integer).
MPI_Is_thread_main is
called by a thread to find out whether the caller is the main thread (that
is, the thread that called MPI_Init or MPI_Init_thread).
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.
If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then
on error the C++ exception mechanism will be used to throw an MPI::Exception
object.
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.
See the MPI man page for a full list of MPI
error codes.
MPI_Init
MPI_Init_thread
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