Initial data commit

Task/Queue-Usage/Fortran/queue-usage.f

@@ -0,0 +1,33 @@
+module fifo_nodes
+  type fifo_node
+     integer :: datum
+     ! the next part is not variable and must be present
+     type(fifo_node), pointer :: next
+     logical :: valid
+  end type fifo_node
+end module fifo_nodes
+
+program FIFOTest
+  use fifo
+  implicit none
+
+  type(fifo_head) :: thehead
+  type(fifo_node), dimension(5) :: ex, xe
+  integer :: i
+
+  call new_fifo(thehead)
+
+  do i = 1, 5
+     ex(i)%datum = i
+     call fifo_enqueue(thehead, ex(i))
+  end do
+
+  i = 1
+  do
+     call fifo_dequeue(thehead, xe(i))
+     print *, xe(i)%datum
+     i = i + 1
+     if ( fifo_isempty(thehead) ) exit
+  end do
+
+end program FIFOTest