geqo_random.c File Reference

#include "postgres.h"
#include "optimizer/geqo_random.h"

Include dependency graph for geqo_random.c:

Go to the source code of this file.

Functions
void	geqo_set_seed (PlannerInfo *root, double seed)
double	geqo_rand (PlannerInfo *root)
int	geqo_randint (PlannerInfo *root, int upper, int lower)

Function Documentation

geqo_rand()

double geqo_rand

(

PlannerInfo *

root

)

Definition at line 27 of file geqo_random.c.

{
    GeqoPrivateData *private = GetGeqoPrivateData(root);
 
    return pg_prng_double(&private->random_state);
}

References GetGeqoPrivateData(), pg_prng_double(), and root.

Referenced by linear_rand().

geqo_randint()

int geqo_randint	(	PlannerInfo *	root,
		int	upper,
		int	lower
	)

Definition at line 35 of file geqo_random.c.

{
    GeqoPrivateData *private = GetGeqoPrivateData(root);
 
    /*
     * In current usage, "lower" is never negative so we can just use
     * pg_prng_uint64_range directly.
     */
    return (int) pg_prng_uint64_range(&private->random_state, lower, upper);
}

References GetGeqoPrivateData(), lower(), pg_prng_uint64_range(), root, and upper().

Referenced by edge_failure(), gimme_gene(), gimme_tour(), and init_tour().

geqo_set_seed()

void geqo_set_seed	(	PlannerInfo *	root,
		double	seed
	)

Definition at line 19 of file geqo_random.c.

{
    GeqoPrivateData *private = GetGeqoPrivateData(root);
 
    pg_prng_fseed(&private->random_state, seed);
}

References GetGeqoPrivateData(), pg_prng_fseed(), and root.

Referenced by geqo().