NAME

       MPI_Win_test - Attempts to complete an RMA exposure epoch; a nonblocking version of MPI_Win_wait

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Win_test(MPI_Win win, int *flag)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_WIN_TEST( WIN, FLAG, IERROR)
            INTEGER  WIN, IERROR

C++ Syntax

       #include <mpi.h>
       bool MPI::Win::Test() const

INPUT PARAMETERS

       win       Window object (handle)

OUTPUT PARAMETERS

       IERROR    Fortran only: Error status (integer).

       flag      The returning state of the test for epoch closure.

DESCRIPTION

       MPI_Win_test   is   a  one-sided  MPI  communication  synchronization  call,  a  nonblocking  version  of
       MPI_Win_wait. It returns flag = true if MPI_Win_wait would return, flag = false otherwise. The effect  of
       return  of MPI_Win_test with flag = true is the same as the effect of a return of MPI_Win_wait. If flag =
       false is returned, then the call has no visible effect.

       Invoke MPI_Win_test only where MPI_Win_wait can be invoked. Once the call has returned flag  =  true,  it
       must not be invoked anew, until the window is posted anew.

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++ 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_Win_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 ALSO

       MPI_Win_post MPI_Win_wait

                                                  Jan 21, 2016                                   MPI_Win_test(3)