142 lines
5.8 KiB
Plaintext
142 lines
5.8 KiB
Plaintext
// Filename: atomicAdjustDummyImpl.I
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// Created by: drose (09Aug02)
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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: AtomicAdjustDummyImpl::inc
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// Access: Public, Static
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// Description: Atomically increments the indicated variable.
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////////////////////////////////////////////////////////////////////
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INLINE void AtomicAdjustDummyImpl::
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inc(TVOLATILE AtomicAdjustDummyImpl::Integer &var) {
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++var;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustDummyImpl::dec
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// Access: Public, Static
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// Description: Atomically decrements the indicated variable and
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// returns true if the new value is nonzero, false if it
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// is zero.
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////////////////////////////////////////////////////////////////////
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INLINE bool AtomicAdjustDummyImpl::
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dec(TVOLATILE AtomicAdjustDummyImpl::Integer &var) {
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return (--var) != 0;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustDummyImpl::add
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// Access: Public, Static
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// Description: Atomically computes var += delta. It is legal for
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// delta to be negative.
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////////////////////////////////////////////////////////////////////
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INLINE void AtomicAdjustDummyImpl::
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add(TVOLATILE AtomicAdjustDummyImpl::Integer &var, AtomicAdjustDummyImpl::Integer delta) {
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var += delta;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustDummyImpl::set
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// Access: Public, Static
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// Description: Atomically changes the indicated variable and
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// returns the original value.
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////////////////////////////////////////////////////////////////////
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INLINE AtomicAdjustDummyImpl::Integer AtomicAdjustDummyImpl::
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set(TVOLATILE AtomicAdjustDummyImpl::Integer &var, AtomicAdjustDummyImpl::Integer new_value) {
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Integer orig_value = var;
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var = new_value;
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return orig_value;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustDummyImpl::get
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// Access: Public, Static
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// Description: Atomically retrieves the snapshot value of the
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// indicated variable. This is the only guaranteed safe
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// way to retrieve the value that other threads might be
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// asynchronously setting, incrementing, or decrementing
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// (via other AtomicAjust methods).
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////////////////////////////////////////////////////////////////////
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INLINE AtomicAdjustDummyImpl::Integer AtomicAdjustDummyImpl::
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get(const TVOLATILE AtomicAdjustDummyImpl::Integer &var) {
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return var;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustDummyImpl::set_ptr
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// Access: Public, Static
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// Description: Atomically changes the indicated variable and
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// returns the original value.
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////////////////////////////////////////////////////////////////////
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INLINE AtomicAdjustDummyImpl::Pointer AtomicAdjustDummyImpl::
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set_ptr(TVOLATILE AtomicAdjustDummyImpl::Pointer &var,
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AtomicAdjustDummyImpl::Pointer new_value) {
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Pointer orig_value = var;
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var = new_value;
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return orig_value;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustDummyImpl::get_ptr
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// Access: Public, Static
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// Description: Atomically retrieves the snapshot value of the
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// indicated variable. This is the only guaranteed safe
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// way to retrieve the value that other threads might be
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// asynchronously setting, incrementing, or decrementing
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// (via other AtomicAjust methods).
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////////////////////////////////////////////////////////////////////
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INLINE AtomicAdjustDummyImpl::Pointer AtomicAdjustDummyImpl::
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get_ptr(const TVOLATILE AtomicAdjustDummyImpl::Pointer &var) {
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return var;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustDummyImpl::compare_and_exchange
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// Access: Public, Static
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// Description: Atomic compare and exchange.
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//
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// If mem is equal to old_value, store new_value in mem.
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// In either case, return the original value of mem.
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// The caller can test for success by comparing
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// return_value == old_value.
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////////////////////////////////////////////////////////////////////
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INLINE AtomicAdjustDummyImpl::Integer AtomicAdjustDummyImpl::
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compare_and_exchange(TVOLATILE AtomicAdjustDummyImpl::Integer &mem,
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AtomicAdjustDummyImpl::Integer old_value,
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AtomicAdjustDummyImpl::Integer new_value) {
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Integer orig_value = mem;
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if (mem == old_value) {
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mem = new_value;
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}
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return orig_value;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustDummyImpl::compare_and_exchange_ptr
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// Access: Public, Static
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// Description: Atomic compare and exchange.
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//
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// As above, but works on pointers instead of integers.
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////////////////////////////////////////////////////////////////////
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INLINE AtomicAdjustDummyImpl::Pointer AtomicAdjustDummyImpl::
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compare_and_exchange_ptr(TVOLATILE AtomicAdjustDummyImpl::Pointer &mem,
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AtomicAdjustDummyImpl::Pointer old_value,
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AtomicAdjustDummyImpl::Pointer new_value) {
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Pointer orig_value = mem;
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if (mem == old_value) {
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mem = new_value;
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}
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return orig_value;
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}
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