65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file referenceCount.cxx
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* @author drose
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* @date 1998-10-23
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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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* Does some easy checks to make sure that the reference count isn't
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* completely bogus. Returns true if ok, 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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// If this assertion fails, we're trying to delete an object that was just
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// deleted. Possibly you used a real pointer instead of a PointerTo at some
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// point, and the object was deleted when the PointerTo went out of scope.
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// Maybe you tried to create an automatic (local variable) instance of a
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// class that derives from ReferenceCount. Or maybe your headers are out of
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// sync, and you 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 up
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// altogether. Maybe some errant code stomped all over memory 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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* Returns true if the reference count is nonzero, false 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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* Allocates a new WeakReferenceList structure and 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(_weak_list, nullptr, weak_list);
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if (orig != nullptr) {
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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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