84 lines
3.0 KiB
C++
84 lines
3.0 KiB
C++
// Filename: referenceCount.cxx
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// Created by: drose (23Oct98)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "referenceCount.h"
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#include "atomicAdjust.h"
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#include "mutexImpl.h"
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TypeHandle ReferenceCount::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: ReferenceCount::do_test_ref_count_integrity
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// Access: Protected
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// Description: Does some easy checks to make sure that the reference
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// count isn't completely bogus. Returns true if ok,
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// false otherwise.
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////////////////////////////////////////////////////////////////////
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bool ReferenceCount::
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do_test_ref_count_integrity() const {
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nassertr(this != NULL, false);
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// If this assertion fails, we're trying to delete an object that
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// was just deleted. Possibly you used a real pointer instead of a
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// PointerTo at some point, and the object was deleted when the
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// PointerTo went out of scope. Maybe you tried to create an
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// automatic (local variable) instance of a class that derives from
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// ReferenceCount. Or maybe your headers are out of sync, and you
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// need to make clean in direct or some higher tree.
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nassertr(_ref_count != deleted_ref_count, false);
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// If this assertion fails, the reference counts are all screwed
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// up altogether. Maybe some errant code stomped all over memory
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// somewhere.
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nassertr(_ref_count >= 0, false);
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: ReferenceCount::do_test_ref_count_nonzero
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// Access: Protected
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// Description: Returns true if the reference count is nonzero, false
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// otherwise.
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////////////////////////////////////////////////////////////////////
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bool ReferenceCount::
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do_test_ref_count_nonzero() const {
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nassertr(do_test_ref_count_integrity(), false);
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nassertr(_ref_count > 0, false);
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: ReferenceCount::create_weak_list
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// Access: Private
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// Description: Allocates a new WeakReferenceList structure and
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// stores it on the object.
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////////////////////////////////////////////////////////////////////
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void ReferenceCount::
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create_weak_list() {
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WeakReferenceList *weak_list = new WeakReferenceList;
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void *orig =
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AtomicAdjust::compare_and_exchange_ptr((void *&)_weak_list, NULL, weak_list);
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if (orig != (void *)NULL) {
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// Someone else created it first.
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delete weak_list;
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}
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}
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