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AudioServer: Detect improperly detached audio clients

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Because IPC is used very little in audio server communication, a
ping-pong method like WindowServer is neither a good nor a reliable way
of detecting detached audio clients. AudioServer was previously doing
nothing to detect the kinds of clients that never closed their
connection properly, which happens e.g. when a program is force-closed.
Due to reference-counting cycles, the associated client connection
queues were being kept alive. However, the is_open method of local
sockets reliably detects all kinds of disconnected sockets and can
easily be adapted for this use case. With this fix, we no longer get
"Audio client can't keep up" spam on improperly disconnected clients,
and the client queues don't fill up indefinitely, reducing processing
and memory usage in AudioServer.
This commit is contained in:
kleines Filmröllchen 2022-11-23 12:50:26 +01:00 • committed by Andrew Kaster
parent 441555ea56
commit d9c1eb860f
2 changed files with 11 additions and 5 deletions
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2
Userland/Services/AudioServer/Mixer.cpp
View file

@ -70,7 +70,7 @@ void Mixer::mix()
}
}
active_mix_queues.remove_all_matching([&](auto& entry) { return !entry->client(); });
active_mix_queues.remove_all_matching([&](auto& entry) { return !entry->is_connected(); });
Array<Audio::Sample, HARDWARE_BUFFER_SIZE> mixed_buffer;

14
Userland/Services/AudioServer/Mixer.h
View file

@ -47,12 +47,16 @@ public:
return false;
if (m_in_chunk_location >= m_current_audio_chunk.size()) {
// FIXME: We should send a did_misbehave to the client if the queue is empty,
// but the lifetimes involved mean that we segfault if we try to do that.
auto result = m_buffer->try_dequeue();
if (result.is_error()) {
if (result.error() == Audio::AudioQueue::QueueStatus::Empty)
dbgln("Audio client can't keep up!");
if (result.error() == Audio::AudioQueue::QueueStatus::Empty) {
dbgln("Audio client {} can't keep up!", m_client->client_id());
// Note: Even though we only check client state here, we will probably close the client much earlier.
if (!m_client->is_open()) {
dbgln("Client socket {} has closed, closing audio server connection.", m_client->client_id());
m_client->shutdown();
}
}
return false;
}
@ -65,6 +69,8 @@ public:
return true;
}
bool is_connected() const { return m_client && m_client->is_open(); }
ConnectionFromClient* client() { return m_client.ptr(); }
void set_buffer(OwnPtr<Audio::AudioQueue> buffer) { m_buffer = move(buffer); }