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Fix occasional MIDI read crash.

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Locking should prevent this from being a problem, but taking a reference to the
cached iterator and mutating it directly causes occasional crashes for me for
reasons I can't quite figure out.

This fixes the issue and is arguably more sane anyway, so whatever.
This commit is contained in:
David Robillard 2014-12-28 15:14:47 -05:00
parent dbc2f59453
commit ec947ff8fd
1 changed files with 4 additions and 3 deletions
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7
libs/ardour/midi_source.cc
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@ -200,11 +200,10 @@ MidiSource::midi_read (const Lock& lm,
if (_model) {
// Find appropriate model iterator
Evoral::Sequence<Evoral::MusicalTime>::const_iterator& i = _model_iter;
Evoral::Sequence<Evoral::MusicalTime>::const_iterator i = _model_iter;
if (_last_read_end == 0 || start != _last_read_end || !_model_iter_valid) {
// Cached iterator is invalid, search for the first event past start
i = _model->begin(converter.from(start), false, filtered);
_model_iter_valid = true;
i = _model->begin(converter.from(start), false, filtered);
}
_last_read_end = start + cnt;
@ -230,6 +229,8 @@ MidiSource::midi_read (const Lock& lm,
break;
}
}
_model_iter = i;
_model_iter_valid = true;
return cnt;
} else {
return read_unlocked (lm, dst, source_start, start, cnt, tracker);