popcount(3) [netbsd man page]

POPCOUNT(3)						   BSD Library Functions Manual 					       POPCOUNT(3)

NAME

     popcount, popcountl, popcountll, popcount32, popcount64 -- count number of bits set in a bit string

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <strings.h>

     unsigned int
     popcount(unsigned int value);

     unsigned int
     popcountl(unsigned long value);

     unsigned int
     popcountll(unsigned long long value);

     #include <stdint.h>

     unsigned int
     popcount32(uint32_t value);

     unsigned int
     popcount64(uint64_t value);

DESCRIPTION

     The popcount functions returns the number of bits set in value.

SEE ALSO

     ffs(3)

HISTORY

     The popcount(), popcountl(), popcountll(), popcount32(), and popcount64() functions appeared in NetBSD 6.0.

BSD
								  August 22, 2011							       BSD

ATOMIC_AND(3)						   BSD Library Functions Manual 					     ATOMIC_AND(3)

NAME

     atomic_and, atomic_and_32, atomic_and_uint, atomic_and_ulong, atomic_and_64, atomic_and_32_nv, atomic_and_uint_nv, atomic_and_ulong_nv,
     atomic_and_64_nv -- atomic logical 'and' operations

SYNOPSIS

     #include <sys/atomic.h>

     void
     atomic_and_32(volatile uint32_t *ptr, uint32_t bits);

     void
     atomic_and_uint(volatile unsigned int *ptr, unsigned int bits);

     void
     atomic_and_ulong(volatile unsigned long *ptr, unsigned long bits);

     void
     atomic_and_64(volatile uint64_t *ptr, uint64_t bits);

     uint32_t
     atomic_and_32_nv(volatile uint32_t *ptr, uint32_t bits);

     unsigned int
     atomic_and_uint_nv(volatile unsigned int *ptr, unsigned int bits);

     unsigned long
     atomic_and_ulong_nv(volatile unsigned long *ptr, unsigned long bits);

     uint64_t
     atomic_and_64_nv(volatile uint64_t *ptr, uint64_t bits);

DESCRIPTION

     The atomic_and family of functions load the value of the variable referenced by ptr, perform a logical 'and' 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_and functions first appeared in NetBSD 5.0.

BSD
								  April 11, 2007							       BSD