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https://www.gnu.org/licenses/gpl-howto.html recommends that the 'If not, see <url>.' phrase be a separate sentence. * tests/securityselinuxhelper.c: Remove doubled line. * tests/securityselinuxtest.c: Likewise. * globally: s/; If/. If/
455 lines
13 KiB
C
455 lines
13 KiB
C
/*
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* viratomic.h: atomic integer operations
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*
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* Copyright (C) 2012 Red Hat, Inc.
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*
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* Based on code taken from GLib 2.32, under the LGPLv2+
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*
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* Copyright (C) 2011 Ryan Lortie
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __VIR_ATOMIC_H__
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# define __VIR_ATOMIC_H__
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# include "internal.h"
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# ifdef VIR_ATOMIC_OPS_GCC
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# define VIR_STATIC /* Nothing; we just never define the functions */
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# else
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# define VIR_STATIC static
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# endif
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/**
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* virAtomicIntGet:
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* Gets the current value of atomic.
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*
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* This call acts as a full compiler and hardware memory barrier
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* (before the get)
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*/
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VIR_STATIC int virAtomicIntGet(volatile int *atomic)
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ATTRIBUTE_NONNULL(1);
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/**
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* virAtomicIntSet:
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* Sets the value of atomic to newval.
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*
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* This call acts as a full compiler and hardware memory barrier
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* (after the set)
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*/
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VIR_STATIC void virAtomicIntSet(volatile int *atomic,
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int newval)
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ATTRIBUTE_NONNULL(1);
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/**
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* virAtomicIntInc:
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* Increments the value of atomic by 1.
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*
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* Think of this operation as an atomic version of
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* { *atomic += 1; return *atomic; }
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*
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* This call acts as a full compiler and hardware memory barrier.
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*/
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VIR_STATIC int virAtomicIntInc(volatile int *atomic)
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ATTRIBUTE_NONNULL(1);
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/**
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* virAtomicIntDecAndTest:
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* Decrements the value of atomic by 1.
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*
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* Think of this operation as an atomic version of
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* { *atomic -= 1; return *atomic == 0; }
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*
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* This call acts as a full compiler and hardware memory barrier.
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*/
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VIR_STATIC bool virAtomicIntDecAndTest(volatile int *atomic)
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ATTRIBUTE_NONNULL(1);
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/**
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* virAtomicIntCompareExchange:
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* Compares atomic to oldval and, if equal, sets it to newval. If
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* atomic was not equal to oldval then no change occurs.
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*
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* This compare and exchange is done atomically.
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*
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* Think of this operation as an atomic version of
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* { if (*atomic == oldval) { *atomic = newval; return true; }
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* else return false; }
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*
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* This call acts as a full compiler and hardware memory barrier.
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*/
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VIR_STATIC bool virAtomicIntCompareExchange(volatile int *atomic,
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int oldval,
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int newval)
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ATTRIBUTE_NONNULL(1);
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/**
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* virAtomicIntAdd:
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* Atomically adds val to the value of atomic.
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*
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* Think of this operation as an atomic version of
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* { tmp = *atomic; *atomic += val; return tmp; }
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*
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* This call acts as a full compiler and hardware memory barrier.
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*/
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VIR_STATIC int virAtomicIntAdd(volatile int *atomic,
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int val)
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ATTRIBUTE_NONNULL(1);
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/**
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* virAtomicIntAnd:
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* Performs an atomic bitwise 'and' of the value of atomic
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* and val, storing the result back in atomic.
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*
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* This call acts as a full compiler and hardware memory barrier.
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*
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* Think of this operation as an atomic version of
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* { tmp = *atomic; *atomic &= val; return tmp; }
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*/
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VIR_STATIC unsigned int virAtomicIntAnd(volatile unsigned int *atomic,
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unsigned int val)
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ATTRIBUTE_NONNULL(1);
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/**
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* virAtomicIntOr:
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* Performs an atomic bitwise 'or' of the value of atomic
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* and val, storing the result back in atomic.
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*
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* Think of this operation as an atomic version of
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* { tmp = *atomic; *atomic |= val; return tmp; }
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*
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* This call acts as a full compiler and hardware memory barrier.
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*/
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VIR_STATIC unsigned int virAtomicIntOr(volatile unsigned int *atomic,
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unsigned int val)
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ATTRIBUTE_NONNULL(1);
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/**
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* virAtomicIntXor:
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* Performs an atomic bitwise 'xor' of the value of atomic
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* and val, storing the result back in atomic.
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*
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* Think of this operation as an atomic version of
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* { tmp = *atomic; *atomic ^= val; return tmp; }
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*
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* This call acts as a full compiler and hardware memory barrier.
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*/
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VIR_STATIC unsigned int virAtomicIntXor(volatile unsigned int *atomic,
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unsigned int val)
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ATTRIBUTE_NONNULL(1);
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# undef VIR_STATIC
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# ifdef VIR_ATOMIC_OPS_GCC
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# define virAtomicIntGet(atomic) \
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(__extension__ ({ \
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(void)verify_true(sizeof(*(atomic)) == sizeof(int)); \
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(void)(0 ? *(atomic) ^ *(atomic) : 0); \
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__sync_synchronize(); \
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(int)*(atomic); \
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}))
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# define virAtomicIntSet(atomic, newval) \
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(__extension__ ({ \
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(void)verify_true(sizeof(*(atomic)) == sizeof(int)); \
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(void)(0 ? *(atomic) ^ (newval) : 0); \
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*(atomic) = (newval); \
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__sync_synchronize(); \
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}))
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# define virAtomicIntInc(atomic) \
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(__extension__ ({ \
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(void)verify_true(sizeof(*(atomic)) == sizeof(int)); \
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(void)(0 ? *(atomic) ^ *(atomic) : 0); \
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__sync_add_and_fetch((atomic), 1); \
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}))
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# define virAtomicIntDecAndTest(atomic) \
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(__extension__ ({ \
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(void)verify_true(sizeof(*(atomic)) == sizeof(int)); \
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(void)(0 ? *(atomic) ^ *(atomic) : 0); \
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__sync_fetch_and_sub((atomic), 1) == 1; \
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}))
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# define virAtomicIntCompareExchange(atomic, oldval, newval) \
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(__extension__ ({ \
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(void)verify_true(sizeof(*(atomic)) == sizeof(int)); \
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(void)(0 ? *(atomic) ^ (newval) ^ (oldval) : 0); \
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(bool)__sync_bool_compare_and_swap((atomic), \
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(oldval), (newval)); \
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}))
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# define virAtomicIntAdd(atomic, val) \
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(__extension__ ({ \
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(void)verify_true(sizeof(*(atomic)) == sizeof(int)); \
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(void)(0 ? *(atomic) ^ (val) : 0); \
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(int) __sync_fetch_and_add((atomic), (val)); \
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}))
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# define virAtomicIntAnd(atomic, val) \
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(__extension__ ({ \
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(void)verify_true(sizeof(*(atomic)) == sizeof(int)); \
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(void) (0 ? *(atomic) ^ (val) : 0); \
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(unsigned int) __sync_fetch_and_and((atomic), (val)); \
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}))
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# define virAtomicIntOr(atomic, val) \
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(__extension__ ({ \
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(void)verify_true(sizeof(*(atomic)) == sizeof(int)); \
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(void) (0 ? *(atomic) ^ (val) : 0); \
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(unsigned int) __sync_fetch_and_or((atomic), (val)); \
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}))
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# define virAtomicIntXor(atomic, val) \
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(__extension__ ({ \
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(void)verify_true(sizeof(*(atomic)) == sizeof(int)); \
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(void) (0 ? *(atomic) ^ (val) : 0); \
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(unsigned int) __sync_fetch_and_xor((atomic), (val)); \
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}))
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# else
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# ifdef VIR_ATOMIC_OPS_WIN32
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# include <winsock2.h>
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# include <windows.h>
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# include <intrin.h>
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# if !defined(_M_AMD64) && !defined (_M_IA64) && !defined(_M_X64)
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# define InterlockedAnd _InterlockedAnd
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# define InterlockedOr _InterlockedOr
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# define InterlockedXor _InterlockedXor
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# endif
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/*
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* http://msdn.microsoft.com/en-us/library/ms684122(v=vs.85).aspx
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*/
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static inline int
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virAtomicIntGet(volatile int *atomic)
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{
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MemoryBarrier();
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return *atomic;
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}
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static inline void
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virAtomicIntSet(volatile int *atomic,
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int newval)
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{
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*atomic = newval;
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MemoryBarrier();
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}
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static inline int
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virAtomicIntInc(volatile int *atomic)
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{
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return InterlockedIncrement((volatile LONG *)atomic);
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}
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static inline bool
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virAtomicIntDecAndTest(volatile int *atomic)
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{
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return InterlockedDecrement((volatile LONG *)atomic) == 0;
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}
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static inline bool
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virAtomicIntCompareExchange(volatile int *atomic,
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int oldval,
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int newval)
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{
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return InterlockedCompareExchange((volatile LONG *)atomic, newval, oldval) == oldval;
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}
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static inline int
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virAtomicIntAdd(volatile int *atomic,
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int val)
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{
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return InterlockedExchangeAdd((volatile LONG *)atomic, val);
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}
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static inline unsigned int
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virAtomicIntAnd(volatile unsigned int *atomic,
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unsigned int val)
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{
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return InterlockedAnd((volatile LONG *)atomic, val);
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}
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static inline unsigned int
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virAtomicIntOr(volatile unsigned int *atomic,
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unsigned int val)
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{
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return InterlockedOr((volatile LONG *)atomic, val);
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}
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static inline unsigned int
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virAtomicIntXor(volatile unsigned int *atomic,
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unsigned int val)
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{
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return InterlockedXor((volatile LONG *)atomic, val);
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}
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# else
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# ifdef VIR_ATOMIC_OPS_PTHREAD
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# include <pthread.h>
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extern pthread_mutex_t virAtomicLock;
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static inline int
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virAtomicIntGet(volatile int *atomic)
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{
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int value;
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pthread_mutex_lock(&virAtomicLock);
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value = *atomic;
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pthread_mutex_unlock(&virAtomicLock);
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return value;
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}
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static inline void
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virAtomicIntSet(volatile int *atomic,
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int value)
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{
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pthread_mutex_lock(&virAtomicLock);
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*atomic = value;
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pthread_mutex_unlock(&virAtomicLock);
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}
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static inline int
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virAtomicIntInc(volatile int *atomic)
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{
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int value;
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pthread_mutex_lock(&virAtomicLock);
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value = ++(*atomic);
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pthread_mutex_unlock(&virAtomicLock);
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return value;
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}
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static inline bool
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virAtomicIntDecAndTest(volatile int *atomic)
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{
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bool is_zero;
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pthread_mutex_lock(&virAtomicLock);
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is_zero = --(*atomic) == 0;
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pthread_mutex_unlock(&virAtomicLock);
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return is_zero;
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}
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static inline bool
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virAtomicIntCompareExchange(volatile int *atomic,
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int oldval,
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int newval)
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{
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bool success;
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pthread_mutex_lock(&virAtomicLock);
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if ((success = (*atomic == oldval)))
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*atomic = newval;
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pthread_mutex_unlock(&virAtomicLock);
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return success;
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}
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static inline int
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virAtomicIntAdd(volatile int *atomic,
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int val)
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{
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int oldval;
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pthread_mutex_lock(&virAtomicLock);
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oldval = *atomic;
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*atomic = oldval + val;
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pthread_mutex_unlock(&virAtomicLock);
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return oldval;
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}
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static inline unsigned int
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virAtomicIntAnd(volatile unsigned int *atomic,
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unsigned int val)
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{
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unsigned int oldval;
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pthread_mutex_lock(&virAtomicLock);
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oldval = *atomic;
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*atomic = oldval & val;
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pthread_mutex_unlock(&virAtomicLock);
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return oldval;
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}
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static inline unsigned int
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virAtomicIntOr(volatile unsigned int *atomic,
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unsigned int val)
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{
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unsigned int oldval;
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pthread_mutex_lock(&virAtomicLock);
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oldval = *atomic;
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*atomic = oldval | val;
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pthread_mutex_unlock(&virAtomicLock);
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return oldval;
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}
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static inline unsigned int
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virAtomicIntXor(volatile unsigned int *atomic,
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unsigned int val)
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{
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unsigned int oldval;
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pthread_mutex_lock(&virAtomicLock);
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oldval = *atomic;
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*atomic = oldval ^ val;
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pthread_mutex_unlock(&virAtomicLock);
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return oldval;
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}
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# else
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# error "No atomic integer impl for this platform"
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# endif
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# endif
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/* The int/unsigned int casts here ensure that you can
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* pass either an int or unsigned int to all atomic op
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* functions, in the same way that we can with GCC
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* atomic op helpers.
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*/
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# define virAtomicIntGet(atomic) \
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virAtomicIntGet((int *)atomic)
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# define virAtomicIntSet(atomic, val) \
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virAtomicIntSet((int *)atomic, val)
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# define virAtomicIntInc(atomic) \
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virAtomicIntInc((int *)atomic)
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# define virAtomicIntDecAndTest(atomic) \
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virAtomicIntDecAndTest((int *)atomic)
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# define virAtomicIntCompareExchange(atomic, oldval, newval) \
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virAtomicIntCompareExchange((int *)atomic, oldval, newval)
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# define virAtomicIntAdd(atomic, val) \
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virAtomicIntAdd((int *)atomic, val)
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# define virAtomicIntAnd(atomic, val) \
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virAtomicIntAnd((unsigned int *)atomic, val)
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# define virAtomicIntOr(atomic, val) \
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virAtomicIntOr((unsigned int *)atomic, val)
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# define virAtomicIntXor(atomic, val) \
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virAtomicIntXor((unsigned int *)atomic, val)
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# endif
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#endif /* __VIR_ATOMIC_H */
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