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0bb81a43c9
To access a WeakPointerTo in a thread-safe way, use something like this:
if (auto ptr = weak_ptr.lock()) {
..use ptr as regular PointerTo
}
The new implementation no longer needs a reference to be stored to all weak pointers on the WeakReferenceList; a mere count of weak pointers is sufficient. Therefore, callbacks theoretically no longer require a WeakPointerTo to be constructed.
The WeakPointerTo class is not actually atomic; it could be made so, but I don't believe it's worth it at this time.
62 lines
1.8 KiB
C++
62 lines
1.8 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 atomicAdjustPosixImpl.h
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* @author drose
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* @date 2006-02-10
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*/
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#ifndef ATOMICADJUSTPOSIXIMPL_H
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#define ATOMICADJUSTPOSIXIMPL_H
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#include "dtoolbase.h"
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#include "selectThreadImpl.h"
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#ifdef HAVE_POSIX_THREADS
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#include "numeric_types.h"
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#include <pthread.h>
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/**
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* Uses POSIX to implement atomic adjustments.
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*/
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class EXPCL_DTOOL_DTOOLBASE AtomicAdjustPosixImpl {
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public:
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// In Posix, "long" is generally the native word size (32- or 64-bit), which
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// is what we'd prefer.
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typedef long Integer;
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typedef void *Pointer;
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INLINE static void inc(TVOLATILE Integer &var);
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INLINE static bool dec(TVOLATILE Integer &var);
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INLINE static Integer add(TVOLATILE Integer &var, Integer delta);
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INLINE static Integer set(TVOLATILE Integer &var, Integer new_value);
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INLINE static Integer get(const TVOLATILE Integer &var);
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INLINE static Pointer set_ptr(TVOLATILE Pointer &var, Pointer new_value);
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INLINE static Pointer get_ptr(const TVOLATILE Pointer &var);
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INLINE static Integer compare_and_exchange(TVOLATILE Integer &mem,
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Integer old_value,
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Integer new_value);
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INLINE static Pointer compare_and_exchange_ptr(TVOLATILE Pointer &mem,
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Pointer old_value,
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Pointer new_value);
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private:
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static pthread_mutex_t _mutex;
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};
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#include "atomicAdjustPosixImpl.I"
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#endif // HAVE_POSIX_THREADS
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#endif
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