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libceph: add some fine ASCII art
Sage liked the state diagram I put in my commit description so I'm putting it in with the code. Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
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@ -29,7 +29,47 @@
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* the sender.
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*/
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/* State values for ceph_connection->sock_state; NEW is assumed to be 0 */
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/*
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* We track the state of the socket on a given connection using
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* values defined below. The transition to a new socket state is
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* handled by a function which verifies we aren't coming from an
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* unexpected state.
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*
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* --------
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* | NEW* | transient initial state
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* --------
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* | con_sock_state_init()
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* v
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* ----------
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* | CLOSED | initialized, but no socket (and no
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* ---------- TCP connection)
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* ^ \
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* | \ con_sock_state_connecting()
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* | ----------------------
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* | \
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* + con_sock_state_closed() \
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* |\ \
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* | \ \
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* | ----------- \
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* | | CLOSING | socket event; \
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* | ----------- await close \
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* | ^ |
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* | | |
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* | + con_sock_state_closing() |
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* | / \ |
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* | / --------------- |
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* | / \ v
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* | / --------------
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* | / -----------------| CONNECTING | socket created, TCP
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* | | / -------------- connect initiated
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* | | | con_sock_state_connected()
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* | | v
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* -------------
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* | CONNECTED | TCP connection established
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* -------------
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*
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* State values for ceph_connection->sock_state; NEW is assumed to be 0.
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*/
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#define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
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#define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
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