atomic_swap(3) - NetBSD Manual Pages

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ATOMIC_SWAP(3)          NetBSD Library Functions Manual         ATOMIC_SWAP(3)

atomic_swap, atomic_swap_32, atomic_swap_uint, atomic_swap_ulong, atomic_swap_ptr, atomic_swap_64 -- atomic swap operations
#include <sys/atomic.h> uint32_t atomic_swap_32(volatile uint32_t *ptr, uint32_t new); unsigned int atomic_swap_uint(volatile unsigned int *ptr, unsigned int new); unsigned long atomic_swap_ulong(volatile unsigned long *ptr, unsigned long new); void * atomic_swap_ptr(volatile void *ptr, void *new); uint64_t atomic_swap_64(volatile uint64_t *ptr, uint64_t new);
The atomic_swap family 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.
The atomic_swap functions first appeared in NetBSD 5.0. NetBSD 10.99 April 11, 2007 NetBSD 10.99
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