NAME

atomic_dec, atomic_dec_32, atomic_dec_uint, atomic_dec_ulong, atomic_dec_ptr, atomic_dec_64, atomic_dec_32_nv, atomic_dec_uint_nv, atomic_dec_ulong_nv, atomic_dec_ptr_nv, atomic_dec_64_nv - atomic decrement operations

SYNOPSIS



void atomic_dec_32(volatile uint32_t *ptr)

void atomic_dec_uint(volatile unsigned int *ptr)

void atomic_dec_ulong(volatile unsigned long *ptr)

void atomic_dec_ptr(volatile void *ptr)

void atomic_dec_64(volatile uint64_t *ptr)

uint32_t atomic_dec_32_nv(volatile uint32_t *ptr)

unsigned int atomic_dec_uint_nv(volatile unsigned int *ptr)

unsigned long atomic_dec_ulong_nv(volatile unsigned long *ptr)

void * atomic_dec_ptr_nv(volatile void *ptr)

uint64_t atomic_dec_64_nv(volatile uint64_t *ptr)

DESCRIPTION

The atomic_dec family of functions decrement (by one) the variable referenced by ptr in an atomic fashion.

The *_nv() variants of these functions return the new value.

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 ALSO

atomic_ops(3)

HISTORY

The atomic_dec functions first appeared in NetBSD5.0.