119 lines
3.9 KiB
Text
119 lines
3.9 KiB
Text
/**
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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 atomicAdjustGccImpl.I
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* @author rdb
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* @date 2014-07-04
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*/
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/**
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* Atomically increments the indicated variable.
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*/
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INLINE void AtomicAdjustGccImpl::
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inc(TVOLATILE AtomicAdjustGccImpl::Integer &var) {
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__atomic_fetch_add(&var, 1, __ATOMIC_SEQ_CST);
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}
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/**
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* Atomically decrements the indicated variable and returns true if the new
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* value is nonzero, false if it is zero.
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*/
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INLINE bool AtomicAdjustGccImpl::
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dec(TVOLATILE AtomicAdjustGccImpl::Integer &var) {
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return (__atomic_sub_fetch(&var, 1, __ATOMIC_SEQ_CST) != 0);
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}
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/**
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* Atomically computes var += delta. It is legal for delta to be negative.
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* Returns the result of the addition.
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*/
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INLINE AtomicAdjustGccImpl::Integer AtomicAdjustGccImpl::
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add(TVOLATILE AtomicAdjustGccImpl::Integer &var,
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AtomicAdjustGccImpl::Integer delta) {
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return __atomic_add_fetch(&var, delta, __ATOMIC_SEQ_CST);
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}
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/**
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* Atomically changes the indicated variable and returns the original value.
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*/
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INLINE AtomicAdjustGccImpl::Integer AtomicAdjustGccImpl::
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set(TVOLATILE AtomicAdjustGccImpl::Integer &var,
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AtomicAdjustGccImpl::Integer new_value) {
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return __atomic_exchange_n(&var, new_value, __ATOMIC_SEQ_CST);
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}
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/**
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* Atomically retrieves the snapshot value of the indicated variable. This is
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* the only guaranteed safe way to retrieve the value that other threads might
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* be asynchronously setting, incrementing, or decrementing (via other
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* AtomicAjust methods).
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*/
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INLINE AtomicAdjustGccImpl::Integer AtomicAdjustGccImpl::
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get(const TVOLATILE AtomicAdjustGccImpl::Integer &var) {
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return __atomic_load_n(&var, __ATOMIC_SEQ_CST);
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}
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/**
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* Atomically changes the indicated variable and returns the original value.
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*/
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INLINE AtomicAdjustGccImpl::Pointer AtomicAdjustGccImpl::
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set_ptr(TVOLATILE AtomicAdjustGccImpl::Pointer &var,
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AtomicAdjustGccImpl::Pointer new_value) {
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return __atomic_exchange_n(&var, new_value, __ATOMIC_SEQ_CST);
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}
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/**
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* Atomically retrieves the snapshot value of the indicated variable. This is
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* the only guaranteed safe way to retrieve the value that other threads might
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* be asynchronously setting, incrementing, or decrementing (via other
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* AtomicAjust methods).
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*/
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INLINE AtomicAdjustGccImpl::Pointer AtomicAdjustGccImpl::
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get_ptr(const TVOLATILE AtomicAdjustGccImpl::Pointer &var) {
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return __atomic_load_n(&var, __ATOMIC_SEQ_CST);
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}
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/**
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* Atomic compare and exchange.
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*
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* If mem is equal to old_value, store new_value in mem. In either case,
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* return the original value of mem. The caller can test for success by
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* comparing return_value == old_value.
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*
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* The atomic function expressed in pseudo-code:
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*
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* orig_value = mem; if (mem == old_value) { mem = new_value; } return
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* orig_value;
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*
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*/
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INLINE AtomicAdjustGccImpl::Integer AtomicAdjustGccImpl::
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compare_and_exchange(TVOLATILE AtomicAdjustGccImpl::Integer &mem,
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AtomicAdjustGccImpl::Integer old_value,
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AtomicAdjustGccImpl::Integer new_value) {
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__atomic_compare_exchange_n(&mem, &old_value, new_value, false,
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__ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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return old_value;
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}
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/**
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* 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 AtomicAdjustGccImpl::Pointer AtomicAdjustGccImpl::
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compare_and_exchange_ptr(TVOLATILE AtomicAdjustGccImpl::Pointer &mem,
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AtomicAdjustGccImpl::Pointer old_value,
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AtomicAdjustGccImpl::Pointer new_value) {
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__atomic_compare_exchange_n(&mem, &old_value, new_value, false,
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__ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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return old_value;
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}
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