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gst/tcp/gstmultifdsink.*: Fix race condition in multifdsink that can lead to spurious duplicate clients. this patch a...
Original commit message from CVS: * gst/tcp/gstmultifdsink.c: (gst_multi_fd_sink_class_init), (gst_multi_fd_sink_remove_client_link): * gst/tcp/gstmultifdsink.h: Fix race condition in multifdsink that can lead to spurious duplicate clients. this patch adds a new signal that is fired when multifdsink has removed all references to the fd. Fixes #339574. Updated documentation. API: client-fd-removed signal added
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Wim Taymans
parent
b52a2da427
commit
6a6acca4e8
12
ChangeLog
12
ChangeLog
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@ -1,3 +1,15 @@
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2006-04-28 Wim Taymans <wim@fluendo.com>
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* gst/tcp/gstmultifdsink.c: (gst_multi_fd_sink_class_init),
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(gst_multi_fd_sink_remove_client_link):
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* gst/tcp/gstmultifdsink.h:
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Fix race condition in multifdsink that can lead to spurious
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duplicate clients. this patch adds a new signal that is fired when
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multifdsink has removed all references to the fd.
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Fixes #339574.
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Updated documentation.
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API: client-fd-removed signal added
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2006-04-28 Michael Smith <msmith@fluendo.com>
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* gst/tcp/gstmultifdsink.c: (gst_multi_fd_sink_get_stats):
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@ -34,8 +34,12 @@
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* descriptor removed the "client-removed" signal will be called. The "client-removed"
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* signal can also be fired when multifdsink decides that a client is not active anymore
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* or, depending on the value of the "recover-policy" if the client is reading to slow.
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* In all cases, multifdsink will never close a filedescriptor itself, the application
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* has to do that itself, for example, in the "client-removed" signal callback.
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* In all cases, multifdsink will never ever close a filedescriptor itself, the application
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* has to do that itself in the "client-fd-removed" signal, for example.
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* Note that multifdsink still has a reference to the file descriptor when the
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* "client-removed" signal is emited so that "get-stats" can be performed on the
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* descriptor; It is therefore not allowed to close the file descriptor in the
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* "client-removed" signal, use the "client-fd-removed" signal to close the fd.
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* </para>
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* <para>
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* Multifdsink internally keeps a queue of the incomming buffers and uses a separate
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@ -79,7 +83,7 @@
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* </para>
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* </refsect2>
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*
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* Last reviewed on 2006-03-01 (0.10.4)
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* Last reviewed on 2006-04-28 (0.10.7)
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*/
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#ifdef HAVE_CONFIG_H
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@ -150,6 +154,7 @@ enum
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/* signals */
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SIGNAL_CLIENT_ADDED,
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SIGNAL_CLIENT_REMOVED,
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SIGNAL_CLIENT_FD_REMOVED,
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LAST_SIGNAL
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};
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@ -465,18 +470,42 @@ gst_multi_fd_sink_class_init (GstMultiFdSinkClass * klass)
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/**
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* GstMultiFdSink::client-removed:
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* @gstmultifdsink: the multifdsink element that emitted this signal
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* @fd: the file descriptor that was removed from multifdsink
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* @fd: the file descriptor that is to be removed from multifdsink
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* @status: the reason why the client was removed
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*
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* The given file descriptor was removed from multifdsink. This signal will
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* be emited from the streaming thread so applications should be prepared
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* for that.
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* The given file descriptor is about to be removed from multifdsink. This
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* signal will be emited from the streaming thread so applications should
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* be prepared for that.
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*
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* @gstmultifdsink still holds a handle to @fd so it is possible to call
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* the get-stats signal from this callback. For the same reason it is
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* not safe to close() and reuse @fd in this callback.
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*/
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gst_multi_fd_sink_signals[SIGNAL_CLIENT_REMOVED] =
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g_signal_new ("client-removed", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstMultiFdSinkClass,
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client_removed), NULL, NULL, gst_tcp_marshal_VOID__INT_BOXED,
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G_TYPE_NONE, 2, G_TYPE_INT, GST_TYPE_CLIENT_STATUS);
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/**
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* GstMultiFdSink::client-fd-removed:
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* @gstmultifdsink: the multifdsink element that emitted this signal
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* @fd: the file descriptor that was removed from multifdsink
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*
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* The given file descriptor was removed from multifdsink. This signal will
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* be emited from the streaming thread so applications should be prepared
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* for that.
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*
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* In this callback, @gstmultifdsink has removed all the information
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* associated with @fd and it is therefore not possible to call get-stats
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* with @fd. It is however safe to close() and reuse @fd in the callback.
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*
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* Since: 0.10.7
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*/
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gst_multi_fd_sink_signals[SIGNAL_CLIENT_FD_REMOVED] =
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g_signal_new ("client-fd-removed", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstMultiFdSinkClass,
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client_fd_removed), NULL, NULL, gst_tcp_marshal_VOID__INT,
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G_TYPE_NONE, 1, G_TYPE_INT);
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_multi_fd_sink_change_state);
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@ -771,6 +800,8 @@ gst_multi_fd_sink_remove_client_link (GstMultiFdSink * sink, GList * link)
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/* lock again before we remove the client completely */
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CLIENTS_LOCK (sink);
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/* fd cannot be reused in the above signal callback so we can safely
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* remove it from the hashtable here */
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if (!g_hash_table_remove (sink->fd_hash, &client->fd.fd)) {
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GST_WARNING_OBJECT (sink,
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"[fd %5d] error removing client %p from hash", client->fd.fd, client);
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@ -786,6 +817,13 @@ gst_multi_fd_sink_remove_client_link (GstMultiFdSink * sink, GList * link)
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fclass->removed (sink, client->fd.fd);
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g_free (client);
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CLIENTS_UNLOCK (sink);
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/* and the fd is really gone now */
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g_signal_emit (G_OBJECT (sink),
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gst_multi_fd_sink_signals[SIGNAL_CLIENT_FD_REMOVED], 0, fd);
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CLIENTS_LOCK (sink);
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}
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/* handle a read on a client fd,
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@ -221,8 +221,9 @@ struct _GstMultiFdSinkClass {
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void (*removed) (GstMultiFdSink *sink, int fd);
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/* signals */
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void (*client_added) (GstElement *element, gchar *host, gint fd);
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void (*client_removed) (GstElement *element, gchar *host, gint fd);
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void (*client_added) (GstElement *element, gint fd);
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void (*client_removed) (GstElement *element, gint fd, GstClientStatus status);
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void (*client_fd_removed) (GstElement *element, gint fd);
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};
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GType gst_multi_fd_sink_get_type (void);
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