Window object (handle)
IERROR Fortran only: Error status (integer). flag The returning state of the test for epoch closure.
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.
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.
|1.10.2||MPI_WIN_TEST (3)||Jan 21, 2016|