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correct locking semantics

This commit is contained in:
Kevin Matz 2022-12-09 23:09:52 -05:00
parent 8221c90e24
commit eb47f6543f
2 changed files with 20 additions and 17 deletions
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7
protocol/esta/sacn/arbitratinguniverse.cpp
View File

@ -139,7 +139,9 @@ void ArbitratingUniverse::deleteSourceUniverse(const DATA::data_header& src)
return;
if (sources_.size() == 1 && hold_last_look_)
return;
std::unique_lock lk_wctl(lk_ctl);
}
{
std::unique_lock lk_ctl(mtx_control);
sources_.erase(src);
}
doListChangeCallbacks();
@ -187,7 +189,6 @@ std::shared_ptr<void> ArbitratingUniverse::onSourceListChange(std::function<void
*/
void ArbitratingUniverse::doListChangeCallbacks()
{
std::shared_lock lk_ctl(mtx_control);
for (auto it = cb_sourceListChange.begin(); it != cb_sourceListChange.end();)
{
if (auto sp = it->lock())
@ -197,7 +198,7 @@ void ArbitratingUniverse::doListChangeCallbacks()
}
else
{ // or remove the callback
std::unique_lock lk_wctl(lk_ctl);
std::unique_lock lk_ctl(mtx_control);
it = cb_sourceListChange.erase(it);
}
}

30
protocol/esta/sacn/universe.cpp
View File

@ -95,25 +95,27 @@ bool Universe::isSyncronized()
*/
void Universe::synchronize(uint8_t sequence_number)
{
std::shared_lock lk_ctl(mtx_control);
if (!sync_data_)
return;
/// > \cite sACN 6.7.2 Sequence Numbering
/// >
/// > Having first received a packet with sequence number A,
/// > a second packet with sequence number B arrives.
/// > If, using signed 8-bit binary arithmetic, B - A
/// > is less than or equal to 0, but greater than -20,
/// > then the packet containing sequence number B shall be deemed out of
/// > sequence and discarded.
auto a = sync_sequence_;
auto b = sequence_number;
int8_t dif = b - a;
int8_t dif;
{
std::shared_lock lk_ctl(mtx_control);
/// > \cite sACN 6.7.2 Sequence Numbering
/// >
/// > Having first received a packet with sequence number A,
/// > a second packet with sequence number B arrives.
/// > If, using signed 8-bit binary arithmetic, B - A
/// > is less than or equal to 0, but greater than -20,
/// > then the packet containing sequence number B shall be deemed out of
/// > sequence and discarded.
auto a = sync_sequence_;
auto b = sequence_number;
dif = b - a;
}
if (dif <= 0 && dif > -20)
return;
{
std::unique_lock lk_wctl(lk_ctl);
std::unique_lock lk_ctl(mtx_control);
sync_sequence_ = sequence_number;
}
DMX::Universe::setData(*sync_data_);