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-\section{\module{gc} ---
-         Garbage Collector interface}
-
-\declaremodule{extension}{gc}
-\modulesynopsis{Interface to the cycle-detecting garbage collector.}
-\moduleauthor{Neil Schemenauer}{nas@arctrix.com}
-\sectionauthor{Neil Schemenauer}{nas@arctrix.com}
-
-This module provides an interface to the optional garbage collector.  It
-provides the ability to disable the collector, tune the collection
-frequency, and set debugging options.  It also provides access to
-unreachable objects that the collector found but cannot free.  Since the
-collector supplements the reference counting already used in Python, you
-can disable the collector if you are sure your program does not create
-reference cycles.  Automatic collection can be disabled by calling
-\code{gc.disable()}.  To debug a leaking program call
-\code{gc.set_debug(gc.DEBUG_LEAK)}. Notice that this includes 
-\code{gc.DEBUG_SAVEALL}, causing garbage-collected objects to be
-saved in gc.garbage for inspection.
-
-The \module{gc} module provides the following functions:
-
-\begin{funcdesc}{enable}{}
-Enable automatic garbage collection.
-\end{funcdesc}
-
-\begin{funcdesc}{disable}{}
-Disable automatic garbage collection.
-\end{funcdesc}
-
-\begin{funcdesc}{isenabled}{}
-Returns true if automatic collection is enabled.
-\end{funcdesc}
-
-\begin{funcdesc}{collect}{\optional{generation}}
-With no arguments, run a full collection.  The optional argument
-\var{generation} may be an integer specifying which generation to collect
-(from 0 to 2).  A \exception{ValueError} is raised if the generation number 
-is invalid.
-The number of unreachable objects found is returned.
-
-\versionchanged[The optional \var{generation} argument was added]{2.5}
-\end{funcdesc}
-
-\begin{funcdesc}{set_debug}{flags}
-Set the garbage collection debugging flags.
-Debugging information will be written to \code{sys.stderr}.  See below
-for a list of debugging flags which can be combined using bit
-operations to control debugging.
-\end{funcdesc}
-
-\begin{funcdesc}{get_debug}{}
-Return the debugging flags currently set.
-\end{funcdesc}
-
-\begin{funcdesc}{get_objects}{}
-Returns a list of all objects tracked by the collector, excluding the
-list returned.
-\versionadded{2.2}
-\end{funcdesc}
-
-\begin{funcdesc}{set_threshold}{threshold0\optional{,
-                                threshold1\optional{, threshold2}}}
-Set the garbage collection thresholds (the collection frequency).
-Setting \var{threshold0} to zero disables collection.
-
-The GC classifies objects into three generations depending on how many
-collection sweeps they have survived.  New objects are placed in the
-youngest generation (generation \code{0}).  If an object survives a
-collection it is moved into the next older generation.  Since
-generation \code{2} is the oldest generation, objects in that
-generation remain there after a collection.  In order to decide when
-to run, the collector keeps track of the number object allocations and
-deallocations since the last collection.  When the number of
-allocations minus the number of deallocations exceeds
-\var{threshold0}, collection starts.  Initially only generation
-\code{0} is examined.  If generation \code{0} has been examined more
-than \var{threshold1} times since generation \code{1} has been
-examined, then generation \code{1} is examined as well.  Similarly,
-\var{threshold2} controls the number of collections of generation
-\code{1} before collecting generation \code{2}.
-\end{funcdesc}
-
-\begin{funcdesc}{get_count}{}
-Return the current collection  counts as a tuple of
-\code{(\var{count0}, \var{count1}, \var{count2})}.
-\versionadded{2.5}
-\end{funcdesc}
-
-\begin{funcdesc}{get_threshold}{}
-Return the current collection thresholds as a tuple of
-\code{(\var{threshold0}, \var{threshold1}, \var{threshold2})}.
-\end{funcdesc}
-
-\begin{funcdesc}{get_referrers}{*objs}
-Return the list of objects that directly refer to any of objs. This
-function will only locate those containers which support garbage
-collection; extension types which do refer to other objects but do not
-support garbage collection will not be found.
-
-Note that objects which have already been dereferenced, but which live
-in cycles and have not yet been collected by the garbage collector can
-be listed among the resulting referrers.  To get only currently live
-objects, call \function{collect()} before calling
-\function{get_referrers()}.
-
-Care must be taken when using objects returned by
-\function{get_referrers()} because some of them could still be under
-construction and hence in a temporarily invalid state. Avoid using
-\function{get_referrers()} for any purpose other than debugging.
-
-\versionadded{2.2}
-\end{funcdesc}
-
-\begin{funcdesc}{get_referents}{*objs}
-Return a list of objects directly referred to by any of the arguments.
-The referents returned are those objects visited by the arguments'
-C-level \member{tp_traverse} methods (if any), and may not be all
-objects actually directly reachable.  \member{tp_traverse} methods
-are supported only by objects that support garbage collection, and are
-only required to visit objects that may be involved in a cycle.  So,
-for example, if an integer is directly reachable from an argument, that
-integer object may or may not appear in the result list.
-
-\versionadded{2.3}
-\end{funcdesc}
-
-The following variable is provided for read-only access (you can
-mutate its value but should not rebind it):
-
-\begin{datadesc}{garbage}
-A list of objects which the collector found to be unreachable
-but could not be freed (uncollectable objects).  By default, this list
-contains only objects with \method{__del__()} methods.\footnote{Prior to
-  Python 2.2, the list contained all instance objects in unreachable
-  cycles,  not only those with \method{__del__()} methods.}
-Objects that have
-\method{__del__()} methods and are part of a reference cycle cause
-the entire reference cycle to be uncollectable, including objects
-not necessarily in the cycle but reachable only from it.  Python doesn't
-collect such cycles automatically because, in general, it isn't possible
-for Python to guess a safe order in which to run the \method{__del__()}
-methods.  If you know a safe order, you can force the issue by examining
-the \var{garbage} list, and explicitly breaking cycles due to your
-objects within the list.  Note that these objects are kept alive even
-so by virtue of being in the \var{garbage} list, so they should be
-removed from \var{garbage} too.  For example, after breaking cycles, do
-\code{del gc.garbage[:]} to empty the list.  It's generally better
-to avoid the issue by not creating cycles containing objects with
-\method{__del__()} methods, and \var{garbage} can be examined in that
-case to verify that no such cycles are being created.
-
-If \constant{DEBUG_SAVEALL} is set, then all unreachable objects will
-be added to this list rather than freed.
-\end{datadesc}
-
-
-The following constants are provided for use with
-\function{set_debug()}:
-
-\begin{datadesc}{DEBUG_STATS}
-Print statistics during collection.  This information can
-be useful when tuning the collection frequency.
-\end{datadesc}
-
-\begin{datadesc}{DEBUG_COLLECTABLE}
-Print information on collectable objects found.
-\end{datadesc}
-
-\begin{datadesc}{DEBUG_UNCOLLECTABLE}
-Print information of uncollectable objects found (objects which are
-not reachable but cannot be freed by the collector).  These objects
-will be added to the \code{garbage} list.
-\end{datadesc}
-
-\begin{datadesc}{DEBUG_INSTANCES}
-When \constant{DEBUG_COLLECTABLE} or \constant{DEBUG_UNCOLLECTABLE} is
-set, print information about instance objects found.
-\end{datadesc}
-
-\begin{datadesc}{DEBUG_OBJECTS}
-When \constant{DEBUG_COLLECTABLE} or \constant{DEBUG_UNCOLLECTABLE} is
-set, print information about objects other than instance objects found.
-\end{datadesc}
-
-\begin{datadesc}{DEBUG_SAVEALL}
-When set, all unreachable objects found will be appended to
-\var{garbage} rather than being freed.  This can be useful for debugging
-a leaking program.
-\end{datadesc}
-
-\begin{datadesc}{DEBUG_LEAK}
-The debugging flags necessary for the collector to print
-information about a leaking program (equal to \code{DEBUG_COLLECTABLE |
-DEBUG_UNCOLLECTABLE | DEBUG_INSTANCES | DEBUG_OBJECTS | DEBUG_SAVEALL}).
-\end{datadesc}