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+Network Working Group                                        Steve Wolfe
+Request for Comments:  #202                                     UCLA-CCN
+NIC #7155                                                     Jon Postel
+Categories:  D                                                  UCLA-NMC
+References:  Document #2                                    26 July 1971
+Obsoletes:  None
+
+We have noticed a possible deadlock situation which may arise using the
+Initial Connection Protocol (ICP) specified in Document #2 (NIC #7101 in
+the Current Network Protocols Notebook NIC #7104).
+
+If on both sides one RFC is issued and a "wait for match" is required
+before the second RFC is issued, it is possible that the first RFC's
+will not match.  In particular a deadlock will occur if both sides open
+their send or both sides open their receive sockets first.
+
+Briefly the ICP is:
+<where the original uses a script lowercase letter with a single digit
+subscript we use the lower case letter followed by {digit} so that
+script-m-subscript-2 is printed m{2}>
+
+Server                                User
+------                                ----
+
+S1:  Listen on socket L.              U1:  RTS(U, L, l{1})
+
+S2:  Wait for a match.                U2:  Wait for match.
+
+S3:  STR(L, U, s{1})
+
+S4:  Wait for allocation.             U3:  All(l{1}, m{1}, b{1})
+
+S5:  Send data S in s{1} bit          U4:  Receive data S in s{1}
+     bytes as allowed by                   bit bytes.
+     allocation m{1}, b{1}.
+
+S6:  CLS(L, U)                        U5:  CLS(U, L)
+
+S7:  RTS(S, U+3, l{2})                U6:  STR(U+3, S, s{2})
+
+S8:  STR(S+1, U+2, s{3})              U7:  RTS(U+2, S+1, l{3})
+
+"The labels here imply no ordering except that ordering required by the
+Host-Host Protocol.  Note that steps S7 and S8 can be reversed as can U6
+and U7.  Also, notice that at any time after S2 the server could
+initiate steps S7 and S8 in parallel with steps S3 through S6, and that
+at any time after U4 the user could initiate steps U6 and U7 in parallel
+with step U5."
+
+
+
+                                                                [Page 1]
+
+We recommend that the server perform steps 7 and 8 before waiting for
+the user to perform step 6 or 7.  It is also suggested that the user
+issue the RFC's in steps 6 and 7 without waiting for the server.  (If
+the user is only Listening then both Listens should be issued without
+waiting for the server.)  If for some reason a host must delay between
+issuing RFC's it must issue the RFC's involving sockets S and U+3 first.
+
+       [ This RFC was put into machine readable form for entry ]
+         [ into the online RFC archives by Robert Barnes 6/97 ]
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+                                                                [Page 2]
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