Test for new metadata at each packet
After sending each data packet in live, we need to check if new metadata
is available before sending the index informing the viewer it can read
the trace.
Since the data and the metadata are handled by two different threads,
this patch introduces a rendez-vous point: if new metadata is available,
the data thread flushes the metadata stream and waits on a conditionnal
variable. When the metadata thread finishes to send its data, it wakes
up the data thread which can send its index.
That way, the viewer is informed new metadata is available before
attempting to read a packet that might require an update of the
metadata.
Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: David Goulet <dgoulet@efficios.com>
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