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ATOMIC_OR(3) FreeBSD Library Functions Manual ATOMIC_OR(3) NAME atomic_or, atomic_or_32, atomic_or_uint, atomic_or_ulong, atomic_or_64, atomic_or_32_nv, atomic_or_uint_nv, atomic_or_ulong_nv, atomic_or_64_nv - atomic bitwise `or' operations SYNOPSIS #include <sys/atomic.h> void atomic_or_32(volatile uint32_t *ptr, uint32_t bits); void atomic_or_uint(volatile unsigned int *ptr, unsigned int bits); void atomic_or_ulong(volatile unsigned long *ptr, unsigned long bits); void atomic_or_64(volatile uint64_t *ptr, uint64_t bits); uint32_t atomic_or_32_nv(volatile uint32_t *ptr, uint32_t bits); unsigned int atomic_or_uint_nv(volatile unsigned int *ptr, unsigned int bits); unsigned long atomic_or_ulong_nv(volatile unsigned long *ptr, unsigned long bits); uint64_t atomic_or_64_nv(volatile uint64_t *ptr, uint64_t bits); DESCRIPTION The atomic_or family of functions load the value of the variable referenced by ptr, perform a bitwise `or' with the value bits, and store the result back to 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_or functions first appeared in NetBSD 5.0. FreeBSD 14.1-RELEASE-p8 April 11, 2007 FreeBSD 14.1-RELEASE-p8