A libev based mainloop and lost signals

[Thiago Macieira]

Em Terça-feira 10 Agosto 2010, às 11:49:45, Rémi Denis-Courmont escreveu:
> On Tue, 10 Aug 2010 11:41:46 +0200, Thomas Themel <thomas at themel.com>
> 
> wrote:
> > My client code uses dbus_connection_send_with_reply_and_block to do
> 
> method
> 
> > calls on the server while the mainloop runs in another thread, is this a
> > good idea?
> 
> No. At least it won't work with the current libdbus (as far as I can tell).

This will cause a deadlock. Any such calls that loop back onto the same 
connection will be stuck for 25 seconds, then timeout, then be delivered.

It doesn't matter that another thread is listening, the _and_block function 
controls the socket.

To make this work, you must not use _and_block. You must instead use 
send_with_reply and make sure that the other thread doesn't pull your reply 
before you do.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
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