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Only run one toplevel callback per event loop iteration.

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This change attempts to reinstate as a universal property something
which was sporadically true of the ad-hockery that came before
toplevel callbacks: that if there's a _very long_ queue of things to
be done through the callback mechanism, the doing of them will be
interleaved with re-checks of other event sources, which might (e.g.)
cause a flag to be set which makes the next callback decide not to do
anything after all.

[originally from svn r10040]
This commit is contained in:
Simon Tatham
2013-09-15 14:05:31 +00:00
parent 043a762b5f
commit 5c4ce2fadf
8 changed files with 99 additions and 47 deletions
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4
windows/winsftp.c
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@ -493,7 +493,9 @@ int do_eventsel_loop(HANDLE other_event)
int skcount;
unsigned long now = GETTICKCOUNT();
if (run_timers(now, &next)) {
if (toplevel_callback_pending()) {
ticks = 0;
} else if (run_timers(now, &next)) {
then = now;
now = GETTICKCOUNT();
if (now - then > next - then)