[asio-users] Waiting for the data while async_write

[Michael IV <exp...@gm...>]

Hi again! I need an advice. I have a situation where the data can be
unavailable when asyn_write is getting called. What's the best practice to
wait for the data in such a case?
Here is the case:

void Connection::Send()
{

//we write syncrhoniously
MyData packet;
bool gotPacket = task->data_queue.try_dequeue(packet);
if (!gotPacket)
{
// >>  ???? // Should I run a while(!gotPacket) here?
}
               //fill buffers with data here...
auto self(shared_from_this());
asio::async_write(mSocket, buffers,
[this, self](const asio::error_code error, size_t bytes_transfered)
{
if (error)
{
std::cout << "Async write interrupted with error:" << error.message() <<
std::endl;
return;
}
assert(bytes_transfered);
                       //chain:
                       Send();
}
);
}

So should I run a while( !gotPacket) loop to wait for the data to be
available? Or I can somehow skip this async_write without losing
the chaining? Thanks in advance.