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bug#8869: Unjustified selection time-out


From: Jan Djärv
Subject: bug#8869: Unjustified selection time-out
Date: Mon, 20 Jun 2011 17:24:33 +0200
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; sv-SE; rv:1.9.2.18) Gecko/20110613 Thunderbird/3.1.11



Chong Yidong skrev 2011-06-20 16.57:
Jan Djärv<address@hidden>  writes:

The problem is not calling select with a ong timeout, the problem is
not checking if there is queued events and handling them before
entering select.

Checking Emacs as I run it, select is usually enetered with a timeout
betweeen 10 and 15 seconds, so the potential for this happening is
great.

But the selection request from the other X client can arrive at any
time,

No, it can't. It must arrive after SAVE_TARGET and it is not read unless any X code (XNextEvent or gtk_events_pending()) is executed.

not necessarily before we enter the select.

If the front part of
wait_reading_process_output executes very quickly, we'll enter the
select before a response is ready, in which case Emacs will wait the
entire 20 seconds if no other input is available.

No, in that case the X request has not been read and it still in the socket.
Select will then detect that and return. It is not before XTread_socket is called the event is actually read.

        Jan D.





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