random.c File Reference

Implementation of random number generation functionality. More...

#include <assert.h>
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <util/alloc.h>
#include <util/gv_math.h>
#include <util/random.h>

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Functions
int *	gv_permutation (int bound)
static int	random_small (int bound)
	handle random number generation, bound ≤ RAND_MAX
uint64_t	gv_random_u64 (uint64_t bound)
int	gv_random (int bound)

Function Documentation

gv_permutation()

int * gv_permutation

(

int

bound

)

generate a random permutation of the numbers [0, bound - 1]

The caller is responsible for freeing the returned array. This function calls exit on memory allocation failure.

Parameters

bound

Exclusive upper bound on the sequence

Returns

A permutation of [0, bound - 1]

Definition at line 13 of file random.c.

References gv_calloc(), gv_random(), NULL, and SWAP.

Referenced by maximal_independent_edge_set_heavest_edge_pernode_supernodes_first().

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gv_random()

int gv_random

(

int

bound

)

generate a random number in the range [0, bound - 1]

This function assumes the caller has previously seeded the rand random number generator.

Parameters

bound

Exclusive upper bound on random number generation

Returns

A random number drawn from a uniform distribution

Definition at line 83 of file random.c.

References gv_random_u64(), and random_small().

Referenced by gv_permutation(), and node_distinct_coloring_internal().

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gv_random_u64()

uint64_t gv_random_u64

(

uint64_t

bound

)

generate a random 64-bit unsigned number in the range [0, bound - 1]

This function assumes the caller has previously seeded the rand random number generator.

Parameters

bound

Exclusive upper bound on random number generation

Returns

A random number drawn from a uniform distribution

Definition at line 59 of file random.c.

References random_small(), and UINT8_MAX.

Referenced by genTree(), and gv_random().

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random_small()

static int random_small ( int  bound )

static

Definition at line 34 of file random.c.

Referenced by gv_random(), and gv_random_u64().

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