＜EVENT WAIT Example Program＞

Program event_post_example
  Use iso_fortran_env
  Type(event_type) ev[*]
  If (num_images()<2) Error Stop 'Not enough images'
  If (this_image()==1) Then
    ! Post an event to every other image.
    Do i=2,num_images()
      ! (A real program would store some data for the other image first.)
      Event Post (ev[i])
    End Do
    ! Wait for them to post back.
    Event Wait (ev,Until_Count=num_images()-1)
    Print *,'All events processed.'
  Else
    ! Wait for the event (from image one).
    Event Wait (ev)
    ! (A real program would process the data from image one first.)
    ! Send image one an event to say we have finished.
    Event Post (ev[1])
  End If
End Program

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■ Execution Results

 All events processed.