ATOMIC_SWAP_UINT(9) BSD Kernel Developer's Manual ATOMIC_SWAP_UINT(9)
NAME
atomic_swap_uint, atomic_swap_ulong, atomic_swap_ptr  atomic swap oper
ations
SYNOPSIS
#include <<sys/atomic.h>>
unsigned int
atomic_swap_uint(volatile unsigned int *p, unsigned int new);
unsigned long
atomic_swap_ulong(volatile unsigned long *p, unsigned long new);
void *
atomic_swap_ptr(volatile void *p, void *new);
DESCRIPTION
The atomic_swap set of functions provide an interface for atomically per
forming swap operations with respect to interrupts and multiple proces
sors in the system.
The value referenced by the pointer p is replaced by the value new.
CONTEXT
atomic_swap_uint(), atomic_swap_ulong(), and atomic_swap_ptr() can all be
called during autoconf, from process context, or from interrupt context.
RETURN VALUES
These functions return the value at p as it was before the swap opera
tion.
SEE ALSO
atomic_cas_uint(9)
HISTORY
The atomic_swap functions first appeared in NetBSD 5.0 and OpenBSD 5.5.
BSD July 18, 2014 BSD
