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libbitmask(3)

Silicon Graphics, Inc
2006-05-25

libbitmask1

Multi-word bitmask abstract data type (used by cpusets)

libbitmask-devel

Multi-word bitmask abstract data type (used by cpusets)

NAME

bitmask, bitmask_alloc, bitmask_free, bitmask_displayhex, bitmask_displaylist, bitmask_parsehex, bitmask_parselist, bitmask_copy, bitmask_setall, bitmask_clearall, bitmask_nbytes, bitmask_mask, bitmask_nbits, bitmask_weight, bitmask_isbitset, bitmask_isbitclear, bitmask_isallset, bitmask_isallclear, bitmask_setbit, bitmask_clearbit, bitmask_equal, bitmask_subset, bitmask_disjoint, bitmask_intersects, bitmask_setrange, bitmask_clearrange, bitmask_keeprange, bitmask_complement, bitmask_shiftright, bitmask_shiftleft, bitmask_and, bitmask_andnot, bitmask_or, bitmask_eor, bitmask_first, bitmask_next, bitmask_rel_to_abs_pos, bitmask_abs_to_rel_pos, bitmask_last
- Dynamically sized multi-word bit masks.

SYNOPSIS

#include <bitmask.h>

cc ... -lbitmask

Allocate and free ‘struct bitmask *‘:

struct bitmask *bitmask_alloc(unsigned int nbits);
void bitmask_free(struct bitmask *bmp);

Display and parse ascii string representations:

int bitmask_displayhex(char *buf, int len, const struct bitmask *bmp);
int bitmask_displaylist(char *buf, int len, const struct bitmask *bmp);
int bitmask_parsehex(const char *buf, struct bitmask *bmp);
int bitmask_parselist(const char *buf, struct bitmask *bmp);

Basic initialization operations:

struct bitmask *bitmask_copy(struct bitmask *bmp1, const bitmask *bmp2);
struct bitmask *bitmask_setall(struct bitmask *bmp);
struct bitmask *bitmask_clearall(struct bitmask *bmp);

Interface to kernel sched_{set,get}affinity system calls:

unsigned int bitmask_nbytes(struct bitmask *bmp);
unsigned long *bitmask_mask(struct bitmask *bmp);

Unary numeric queries:

unsigned int bitmask_nbits(const struct bitmask *bmp);
unsigned int bitmask_weight(const struct bitmask *bmp);

Unary Boolean queries:

int bitmask_isbitset(const struct bitmask *bmp, unsigned int i);
int bitmask_isbitclear(const struct bitmask *bmp, unsigned int i);
int bitmask_isallset(const struct bitmask *bmp);
int bitmask_isallclear(const struct bitmask *bmp);

Single bit operations:

struct bitmask *bitmask_setbit(struct bitmask *bmp, unsigned int i);
struct bitmask *bitmask_clearbit(struct bitmask *bmp, unsigned int i);

Binary Boolean operations: bmp1 op? bmp2:

int bitmask_equal(const struct bitmask *bmp1, const bitmask *bmp2);
int bitmask_subset(const struct bitmask *bmp1, const bitmask *bmp2);
int bitmask_disjoint(const struct bitmask *bmp1, const bitmask *bmp2);
int bitmask_intersects(const struct bitmask *bmp1, const bitmask *bmp2);

Range operations:

struct bitmask *bitmask_setrange(struct bitmask *bmp, unsigned int i, unsigned int j);
struct bitmask *bitmask_clearrange(struct bitmask *bmp, unsigned int i, unsigned int j);
struct bitmask *bitmask_keeprange(struct bitmask *bmp, unsigned int i, unsigned int j);

Unary operations:

struct bitmask *bitmask_complement(struct bitmask *bmp1, const bitmask *bmp2);
struct bitmask *bitmask_shiftright(struct bitmask *bmp1, const bitmask *bmp2, unsigned int n);
struct bitmask *bitmask_shiftleft(struct bitmask *bmp1, const bitmask *bmp2, unsigned int n);

Binary operations:

struct bitmask *bitmask_and(struct bitmask *bmp1, const bitmask *bmp2, const bitmask *bmp3);
struct bitmask *bitmask_andnot(struct bitmask *bmp1, const bitmask *bmp2, const bitmask *bmp3);
struct bitmask *bitmask_or(struct bitmask *bmp1, const bitmask *bmp2, const bitmask *bmp3);
struct bitmask *bitmask_eor(struct bitmask *bmp1, const bitmask *bmp2, const bitmask *bmp3);

Iteration operators:

int bitmask_first(const struct bitmask *bmp);
unsigned int bitmask_next(const struct bitmask *bmp, unsigned int i);
unsigned int bitmask_rel_to_abs_pos(const struct bitmask *bmp, unsigned int n);
unsigned int bitmask_abs_to_rel_pos(const struct bitmask *bmp, unsigned int n);
unsigned int bitmask_last(const struct bitmask *bmp);

DESCRIPTION

See further /usr/share/doc/packages/libbitmask/libbitmask.html. This document is also available in plain text format as /usr/share/doc/packages/libbitmask/libbitmask.txt.

SEE ALSO

cpuset(1), libcpuset(3), bootcpuset.conf(5), bootcpuset(8).

AUTHOR

(Paul Jackson)
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