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/* This header implements atomic operation locking helpers. */
#ifndef IN_OVS_ATOMIC_H
#error "This header should only be included indirectly via ovs-atomic.h."
#endif
#define OVS_ATOMIC_LOCKED_IMPL 1
void atomic_lock__(void *);
void atomic_unlock__(void *);
#define atomic_store_locked(DST, SRC) \
(atomic_lock__(DST), \
*(DST) = (SRC), \
atomic_unlock__(DST), \
(void) 0)
#define atomic_read_locked(SRC, DST) \
(atomic_lock__(SRC), \
*(DST) = *(SRC), \
atomic_unlock__(SRC), \
(void) 0)
/* XXX: Evaluates EXP multiple times. */
#define atomic_compare_exchange_locked(DST, EXP, SRC) \
(atomic_lock__(DST), \
(*(DST) == *(EXP) \
? (*(DST) = (SRC), \
atomic_unlock__(DST), \
true) \
: (*(EXP) = *(DST), \
atomic_unlock__(DST), \
false)))
#define atomic_exchange_locked(DST, SRC) \
({ \
atomic_lock__(DST); \
typeof(*(DST)) __tmp = *(DST); \
*(DST) = SRC; \
atomic_unlock__(DST); \
__tmp; \
})
#define atomic_op_locked_add +=
#define atomic_op_locked_sub -=
#define atomic_op_locked_or |=
#define atomic_op_locked_xor ^=
#define atomic_op_locked_and &=
#define atomic_op_locked(RMW, OP, OPERAND, ORIG) \
(atomic_lock__(RMW), \
*(ORIG) = *(RMW), \
*(RMW) atomic_op_locked_##OP (OPERAND), \
atomic_unlock__(RMW))
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