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Improve comment about our random stream choice algorithm

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This commit is contained in:
Nick Mathewson 2013-02-08 16:31:46 -05:00
parent 8cdd8b8353
commit 018fe7d11e
1 changed files with 10 additions and 2 deletions
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12
src/or/relay.c
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@ -1795,9 +1795,17 @@ circuit_resume_edge_reading_helper(edge_connection_t *first_conn,
num_streams++; num_streams++;
if (tor_weak_random_one_in_n(&stream_choice_rng, num_streams)) { if (tor_weak_random_one_in_n(&stream_choice_rng, num_streams)) {
chosen_stream = conn; chosen_stream = conn;
/* Invariant: chosen_stream has been chosen uniformly at random from
* among the first num_streams streams on first_conn. */
} }
/* Invariant: chosen_stream has been chosen uniformly at random from
* among the first num_streams streams on first_conn.
*
* (Note that we iterate over every stream on the circuit, so that after
* we've considered the first stream, we've chosen it with P=1; and
* after we consider the second stream, we've switched to it with P=1/2
* and stayed with the first stream with P=1/2; and after we've
* considered the third stream, we've switched to it with P=1/3 and
* remained with one of the first two streams with P=(2/3), giving each
* one P=(1/2)(2/3) )=(1/3).) */
} }
} }