void TestMessageQueue3()
{
MessageQueue q;
Uint32 sum = 0;
for (Uint32 i = 1; i <= 5; i++)
{
q.enqueue(new Alarm(i));
sum += i;
}
assert(sum == 15);
while (!q.isEmpty())
q.remove(q.back());
assert(q.getCount() == 0);
}
void TestMessageQueue1()
{
MessageQueue q;
Uint32 sum = 0;
for (Uint32 i = 1; i <= 5; i++)
{
q.enqueue(new Alarm(i));
sum += i;
}
assert(Sum(q) == sum);
// Test removing from the middle:
Message* m = q.findByKey(3);
assert(m != 0);
q.remove(m);
assert(Sum(q) == sum - 3);
assert(q.getCount() == 4);
// Test removing from the front:
q.remove(q.front());
assert(Sum(q) == sum - 3 - 1);
assert(q.getCount() == 3);
// Test removing from the front:
q.remove(q.back());
assert(Sum(q) == sum - 3 - 1 - 5);
assert(q.getCount() == 2);
// Test dequeue:
m = q.dequeue();
assert(m->getKey() == 2);
assert(Sum(q) == sum - 3 - 1 - 5 - 2);
assert(q.getCount() == 1);
// Test dequeue:
m = q.dequeue();
assert(m->getKey() == 4);
assert(Sum(q) == sum - 3 - 1 - 5 - 2 - 4);
assert(q.getCount() == 0);
}
void
RPCChannel::OnMessageReceivedFromLink(const Message& msg)
{
AssertLinkThread();
mMonitor->AssertCurrentThreadOwns();
if (MaybeInterceptSpecialIOMessage(msg))
return;
// regardless of the RPC stack, if we're awaiting a sync reply, we
// know that it needs to be immediately handled to unblock us.
if (AwaitingSyncReply() && msg.is_sync()) {
// wake up worker thread waiting at SyncChannel::Send
mRecvd = msg;
NotifyWorkerThread();
return;
}
MessageQueue *queue = (msg.priority() == IPC::Message::PRIORITY_HIGH)
? &mUrgent
: &mPending;
bool compressMessage = (msg.compress() && !queue->empty() &&
queue->back().type() == msg.type() &&
queue->back().routing_id() == msg.routing_id());
if (compressMessage) {
// This message type has compression enabled, and the back of
// the queue was the same message type and routed to the same
// destination. Replace it with the newer message.
MOZ_ASSERT(queue->back().compress());
queue->pop_back();
}
queue->push_back(msg);
// There are three cases we're concerned about, relating to the state of
// the main thread:
//
// (1) We are waiting on a sync reply - main thread is blocked on the IPC monitor.
// - If the message is high priority, we wake up the main thread to
// deliver the message. Otherwise, we leave it in the mPending queue,
// posting a task to the main event loop, where it will be processed
// once the synchronous reply has been received.
//
// (2) We are waiting on an RPC reply - main thread is blocked on the IPC monitor.
// - Always wake up the main thread to deliver the message.
//
// (3) We are not waiting on a reply.
// - We post a task to the main event loop.
//
bool waiting_rpc = (0 != StackDepth());
bool urgent = (msg.priority() == IPC::Message::PRIORITY_HIGH);
if (waiting_rpc || (AwaitingSyncReply() && urgent)) {
// Always wake up our RPC waiter, and wake up sync waiters for urgent
// messages.
NotifyWorkerThread();
} else {
// Worker thread is either not blocked on a reply, or this is an
// incoming RPC that raced with outgoing sync and needs to be deferred
// to a later event-loop iteration.
if (!compressMessage) {
// If we compressed away the previous message, we'll reuse
// its pending task.
mWorkerLoop->PostTask(FROM_HERE, new DequeueTask(mDequeueOneTask));
}
}
}
