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ATOMIC_SWAP(3) Library Functions Manual ATOMIC_SWAP(3)NAMEatomic_swap,atomic_swap_32,atomic_swap_uint,atomic_swap_ulong,atomic_swap_ptr,atomic_swap_64- atomic swap operationsSYNOPSIS#include<sys/atomic.h>uint32_tatomic_swap_32(volatile uint32_t *ptr, uint32_t new); unsigned intatomic_swap_uint(volatile unsigned int *ptr, unsigned int new); unsigned longatomic_swap_ulong(volatile unsigned long *ptr, unsigned long new); void *atomic_swap_ptr(volatile void *ptr, void *new); uint64_tatomic_swap_64(volatile uint64_t *ptr, uint64_t new);DESCRIPTIONTheatomic_swapfamily of functions perform a swap operation in an atomic fashion. The value of the variable referenced by ptr is replaced by new and the old value returned. The 64-bit variants of these functions are available only on platforms that can support atomic 64-bit memory access. Applications can check for the availability of 64-bit atomic memory operations by testing if the pre-processor macro __HAVE_ATOMIC64_OPS is defined.SEE ALSOatomic_ops(3)HISTORYTheatomic_swapfunctions first appeared in NetBSD 5.0. NetBSD 9.99 April 11, 2007 NetBSD 9.99