149 lines
6.2 KiB
Plaintext
149 lines
6.2 KiB
Plaintext
// Filename: atomicAdjustGccImpl.I
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// Created by: rdb (04Jul14)
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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: AtomicAdjustGccImpl::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 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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// Function: AtomicAdjustGccImpl::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 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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// Function: AtomicAdjustGccImpl::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 AtomicAdjustGccImpl::
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add(TVOLATILE AtomicAdjustGccImpl::Integer &var,
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AtomicAdjustGccImpl::Integer delta) {
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__atomic_fetch_add(&var, delta, __ATOMIC_SEQ_CST);
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustGccImpl::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 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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// Function: AtomicAdjustGccImpl::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 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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// Function: AtomicAdjustGccImpl::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 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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// Function: AtomicAdjustGccImpl::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 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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// Function: AtomicAdjustGccImpl::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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// The atomic function expressed in pseudo-code:
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//
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// 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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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, true,
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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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// Function: AtomicAdjustGccImpl::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 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, true,
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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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