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d d � Z d d � Z d d � Z d d � Z d d � Z d S) � Collectora Collects trace data.
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information. Each Tracer points to the same shared data, contributing
traced data points.
When the Collector is started, it creates a Tracer for the current thread,
and installs a function to create Tracers for each new thread started.
When the Collector is stopped, all active Tracers are stopped.
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associated with them.
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`should_trace` is a function, taking a file name, and returning a
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If `timid` is true, then a slower simpler trace function will be
used. This is important for some environments where manipulation of
tracing functions make the faster more sophisticated trace function not
operate properly.
If `branch` is true, then branches will be measured. This involves
collecting data on which statements followed each other (arcs). Use
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`warn` is a warning function, taking a single string message argument,
to be used if a warning needs to be issued.
`concurrency` is a list of strings indicating the concurrency libraries
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