ardour/livetrax
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fix deadlock in mutex'ed PresentationInfo code

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This commit is contained in:
Paul Davis 2017-01-28 09:57:21 +01:00
parent c3d0af413a
commit e998ef5a75
1 changed files with 14 additions and 8 deletions
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22
libs/ardour/presentation_info.cc
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@ -61,14 +61,22 @@ PresentationInfo::suspend_change_signal ()
void
PresentationInfo::unsuspend_change_signal ()
{
Glib::Threads::Mutex::Lock lm (static_signal_lock);
if (g_atomic_int_get (const_cast<gint*> (&_change_signal_suspended)) == 1) {
if (!_pending_static_changes.empty()) {
/* atomically grab currently pending flags */
PropertyChange pc;
{
Glib::Threads::Mutex::Lock lm (static_signal_lock);
pc = _pending_static_changes;
_pending_static_changes.clear ();
}
if (!pc.empty()) {
std::cerr << "PI change (unsuspended): ";
for (PropertyChange::const_iterator x = _pending_static_changes.begin(); x != _pending_static_changes.end(); ++x) {
for (PropertyChange::const_iterator x = pc.begin(); x != pc.end(); ++x) {
std::cerr << g_quark_to_string (*x) << ',';
}
std::cerr << '\n';
@ -79,9 +87,7 @@ PresentationInfo::unsuspend_change_signal ()
* they are handling this one.
*/
Change (_pending_static_changes); /* EMIT SIGNAL */
_pending_static_changes.clear ();
Change (pc); /* EMIT SIGNAL */
}
g_atomic_int_add (const_cast<gint*>(&_change_signal_suspended), -1);
@ -95,9 +101,9 @@ PresentationInfo::send_static_change (const PropertyChange& what_changed)
return;
}
Glib::Threads::Mutex::Lock lm (static_signal_lock);
if (g_atomic_int_get (&_change_signal_suspended)) {
Glib::Threads::Mutex::Lock lm (static_signal_lock);
_pending_static_changes.add (what_changed);
return;
}