4 // Representation of a single, muxed (we only really care about bytes/blocks) stream.
5 // Fed by Input, sent out by Server (to Client).
16 Stream(const std::string &stream_id, size_t backlog_size);
19 // Serialization/deserialization.
20 Stream(const StreamProto &serialized);
21 StreamProto serialize();
23 std::string stream_id;
25 // The HTTP response header, plus the video stream header (if any).
28 // The stream data itself, stored in a circular buffer.
30 // We store our data in a file, so that we can send the data to the
31 // kernel only once (with write()). We then use sendfile() for each
32 // client, which effectively zero-copies it out of the kernel's buffer
33 // cache. This is significantly more efficient than doing write() from
34 // a userspace memory buffer, since the latter makes the kernel copy
35 // the same data from userspace many times.
38 // How many bytes <data_fd> can hold (the buffer size).
41 // How many bytes this stream have received. Can very well be larger
42 // than <backlog_size>, since the buffer wraps.
43 size_t bytes_received;
45 // Clients that are in SENDING_DATA, but that we don't listen on,
46 // because we currently don't have any data for them.
47 // See put_client_to_sleep() and wake_up_all_clients().
48 std::vector<Client *> sleeping_clients;
50 // Clients that we recently got data for (when they were in
51 // <sleeping_clients>).
52 std::vector<Client *> to_process;
54 // What pool to fetch marks from, or NULL.
57 // Put client to sleep, since there is no more data for it; we will on
58 // longer listen on POLLOUT until we get more data. Also, it will be put
59 // in the list of clients to wake up when we do.
60 void put_client_to_sleep(Client *client);
62 // We have more data, so mark all clients that are sleeping as ready to go.
63 void wake_up_all_clients();
66 Stream(const Stream& other);
69 #endif // !defined(_STREAM_H)