154 lines
4.9 KiB
Plaintext
154 lines
4.9 KiB
Plaintext
// Filename: threadSafePointerToBase.I
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// Created by: drose (28Apr06)
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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) 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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////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////
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// Function: ThreadSafePointerToBase::Constructor
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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template<class T>
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INLINE ThreadSafePointerToBase<T>::
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ThreadSafePointerToBase(To *ptr) {
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reassign(ptr);
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}
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////////////////////////////////////////////////////////////////////
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// Function: ThreadSafePointerToBase::Copy Constructor
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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template<class T>
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INLINE ThreadSafePointerToBase<T>::
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ThreadSafePointerToBase(const ThreadSafePointerToBase<T> ©) {
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reassign(copy);
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}
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////////////////////////////////////////////////////////////////////
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// Function: ThreadSafePointerToBase::Destructor
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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template<class T>
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INLINE ThreadSafePointerToBase<T>::
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~ThreadSafePointerToBase() {
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reassign((To *)NULL);
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}
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////////////////////////////////////////////////////////////////////
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// Function: ThreadSafePointerToBase::reassign
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// Access: Protected
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// Description: This is the main work of the ThreadSafePointerTo family. When
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// the pointer is reassigned, decrement the old
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// reference count and increment the new one.
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////////////////////////////////////////////////////////////////////
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template<class T>
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INLINE void ThreadSafePointerToBase<T>::
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reassign(To *ptr) {
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To *old_ptr = (To *)AtomicAdjust::get_ptr(_void_ptr);
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if (ptr == old_ptr) {
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return;
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}
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#ifdef HAVE_THREADS
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void *orig_ptr = AtomicAdjust::compare_and_exchange_ptr(_void_ptr, old_ptr, ptr);
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while (orig_ptr != old_ptr) {
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// Some other thread assigned it first. Try again.
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old_ptr = (To *)AtomicAdjust::get_ptr(_void_ptr);
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if (ptr == old_ptr) {
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return;
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}
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orig_ptr = AtomicAdjust::compare_and_exchange_ptr(_void_ptr, old_ptr, ptr);
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}
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#else // HAVE_THREADS
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_void_ptr = ptr;
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#endif // HAVE_THREADS
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if (ptr != (To *)NULL) {
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ptr->ref();
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#ifdef DO_MEMORY_USAGE
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if (MemoryUsage::get_track_memory_usage()) {
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update_type(ptr);
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}
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#endif
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}
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// Now delete the old pointer.
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if (old_ptr != (To *)NULL) {
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unref_delete(old_ptr);
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: ThreadSafePointerToBase::reassign
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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template<class T>
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INLINE void ThreadSafePointerToBase<T>::
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reassign(const ThreadSafePointerToBase<To> ©) {
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reassign((To *)copy._void_ptr);
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}
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#ifdef DO_MEMORY_USAGE
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////////////////////////////////////////////////////////////////////
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// Function: ThreadSafePointerToBase::update_type
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// Access: Protected
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// Description: Ensures that the MemoryUsage record for the pointer
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// has the right type of object, if we know the type
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// ourselves.
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////////////////////////////////////////////////////////////////////
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template<class T>
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void ThreadSafePointerToBase<T>::
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update_type(To *ptr) {
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TypeHandle type = get_type_handle(To);
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if (type == TypeHandle::none()) {
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do_init_type(To);
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type = get_type_handle(To);
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}
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if (type != TypeHandle::none()) {
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MemoryUsage::update_type(ptr, type);
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}
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}
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#endif // DO_MEMORY_USAGE
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////////////////////////////////////////////////////////////////////
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// Function: ThreadSafePointerToBase::clear
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// Access: Published
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// Description: A convenient way to set the ThreadSafePointerTo object to NULL.
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// (Assignment to a NULL pointer also works, of course.)
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////////////////////////////////////////////////////////////////////
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template<class T>
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INLINE void ThreadSafePointerToBase<T>::
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clear() {
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reassign((To *)NULL);
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}
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////////////////////////////////////////////////////////////////////
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// Function: ThreadSafePointerToBase::output
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// Access: Published
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// Description: A handy function to output ThreadSafePointerTo's as a hex
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// pointer followed by a reference count.
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////////////////////////////////////////////////////////////////////
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template<class T>
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INLINE void ThreadSafePointerToBase<T>::
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output(ostream &out) const {
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out << _void_ptr;
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if (_void_ptr != (void *)NULL) {
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out << ":" << ((To *)_void_ptr)->get_ref_count();
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}
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}
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