During 0-1 each task completes its initiate.

During 1-2
   Task 1 completes its request (i.e., the request is granted).
   Task 2 completes its request (i.e., the request is granted).
   Task 3 completes its request (i.e., the request is granted).
No items available at 2.

During 2-3
   Task 1 releases 1 unit (available at 3).
   Task 2's request cannot be granted (i.e., task 2 is blocked).
   Task 3's request cannot be granted (i.e., task 3 is blocked).
One item available at 3.

During 3-4
   First check blocked tasks.
      Task 2 completes its request.
      Task 3's request cannot be granted.
   Task 1's request cannot be granted.
No items available at 4.

During 4-5
   First check blocked tasks.
      Task 3's request cannot be granted.
      Task 1's request cannot be granted.
   Task 2 releases 2 units (available at 5) and terminates at 5.
Two items available at 5.

During 5-6
   First check blocked tasks.
      Task 3 completes its request
      Task 1's request cannot be granted.
One item available at 6.

During 6-7
   First check blocked tasks.
      Task 1's request cannot be granted
   Task 3 releases 3 units (available at 7) and terminates at 7.
Four items available at 7.

During 7-8
   First check blocked tasks.
      Task 1 completes its request.
One unit available at 8.

During 8-9
   Task 1 releases 3 units (available at 9) and terminates at 9.
Four units available at 9.