[mythtv-firehose] mythtv branch devel/027candidates updated by jyavenard. v0.27-247-gef05e23

Git Repo Owner noreply at mythtv.org
Thu May 1 02:45:07 UTC 2014

The branch, devel/027candidates has been updated on the
mythtv repository by gitolite user jyavenard.
       via  ef05e23711268efd9a6daf79612b2c28aa40fbe2 (commit)
      from  5a7f265ddd4ce17e54c13423befcc177eb17e13a (commit)

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- Log -----------------------------------------------------------------
commit ef05e23711268efd9a6daf79612b2c28aa40fbe2
Author:    Jean-Yves Avenard <jyavenard at mythtv.org> at Thu, 1 May 2014 12:44:24 +1000
Committer: Jean-Yves Avenard <jyavenard at mythtv.org> at Thu, 1 May 2014 12:44:51 +1000
URL:       http://code.mythtv.org/cgit/mythtv/commit/?id=ef05e23711268efd9a6daf79612b2c28aa40fbe2

Fix random SBE PlaybackSock timeout in MBE.
SBE PlaybackSocks in the master suffer from random disconnection, occuring
after a 7000 ms timeout. It often happens when a frontend ask for the
thumbnail of a program currently being recorded on a slave backend.

I could identify two problems causing this:

First, there is a race between MainServer::ProcessRequestWork and
PlaybackSock::SendReceiveStringList. Even if callbacks are disabled during
SendReceiveStringList execution, a ProcessRequestWork may already be running
and can swallow the reply, leading to the timeout in SendReceiveStringList.

The second problem is that an invocation of ProcessRequestWork is fired for
each block of data arriving in the socket (for example when a reply is long
enough to be fragmented, ie. GENERATED_PIXMAP) but this data is consumed all at
once by one worker, leaving the other workers without food. This also leads to
the timeout in ReadStringList.

This patch fixes the first problem by assuring that no worker reads from the
socket while a SendReceiveStringList is running and the second one by aborting
a worker if there is no more data to read, but only once the lock has been

Signed-off-by: Jean-Yves Avenard <jyavenard at mythtv.org>
(cherry picked from commit d7eb6bddc2061287d15bade8d275f9422362f969)


Summary of changes:
 mythtv/programs/mythbackend/mainserver.cpp   |   20 ++++++++++++++++++--
 mythtv/programs/mythbackend/playbacksock.cpp |   16 ++++++++++++++++
 mythtv/programs/mythbackend/playbacksock.h   |    2 ++
 3 files changed, 36 insertions(+), 2 deletions(-)


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