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NAME
MPI_Is_thread_main - Determines if thread called MPI_Init
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Is_thread_main(int *flag)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_IS_THREAD_MAIN(FLAG, IERROR)
LOGICAL FLAG
INTEGER IERROR
C++ Syntax
#include <mpi.h>
bool MPI::Is_thread_main()
OUTPUT PARAMETERS
flag True if calling thread is main thread (boolean).
IERROR Fortran only: Error status (integer).
DESCRIPTION
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).
ERRORS
Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument. C++ func-
tions 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.
SEE ALSO
MPI_Init
MPI_Init_thread
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