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get rid of isc_random_t -- use a wrapper around rand() instead that doesn't do as much work. Also, implement isc_random_jitter(), used to generate a value between a min, max, with a provided jitter value.

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This commit is contained in:
Michael Graff
2000-09-06 02:40:00 +00:00
parent 16803617e4
commit 7da0286b54
5 changed files with 46 additions and 123 deletions
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80
lib/isc/random.c
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: random.c,v 1.10 2000/08/26 01:23:14 bwelling Exp $ */
/* $Id: random.c,v 1.11 2000/09/06 02:39:59 explorer Exp $ */
#include <config.h>
@@ -28,12 +28,11 @@
#include <isc/util.h>
static isc_once_t once = ISC_ONCE_INIT;
static isc_mutex_t rand_lock;
static void
initialize_rand(void)
{
RUNTIME_CHECK(isc_mutex_init(&rand_lock) == ISC_R_SUCCESS);
srand(time(NULL));
}
static void
@@ -42,75 +41,36 @@ initialize(void)
RUNTIME_CHECK(isc_once_do(&once, initialize_rand) == ISC_R_SUCCESS);
}
isc_result_t
isc_random_init(isc_random_t *r)
{
REQUIRE(r != NULL);
r->magic = ISC_RANDOM_MAGIC;
#if 0
return (isc_mutex_init(&r->lock));
#else
return (ISC_R_SUCCESS);
#endif
}
isc_result_t
isc_random_invalidate(isc_random_t *r)
{
isc_result_t result;
REQUIRE(ISC_RANDOM_VALID(r));
#if 0
DESTROYLOCK(&r->lock);
result = ISC_R_SUCCESS;
#else
result = ISC_R_SUCCESS;
#endif
memset(r, 0, sizeof(isc_random_t));
return (result);
}
void
isc_random_seed(isc_random_t *r, isc_uint32_t seed)
isc_random_seed(isc_uint32_t seed)
{
REQUIRE(ISC_RANDOM_VALID(r));
UNUSED(r);
initialize();
#if 0
LOCK(&r->lock);
#endif
LOCK(&rand_lock);
srand(seed);
UNLOCK(&rand_lock);
#if 0
UNLOCK(&r->lock);
#endif
}
void
isc_random_get(isc_random_t *r, isc_uint32_t *val)
isc_random_get(isc_uint32_t *val)
{
REQUIRE(ISC_RANDOM_VALID(r));
REQUIRE(val != NULL);
UNUSED(r);
initialize();
#if 0
LOCK(&r->lock);
#endif
LOCK(&rand_lock);
*val = rand();
UNLOCK(&rand_lock);
#if 0
UNLOCK(&r->lock);
#endif
}
isc_uint32_t
isc_random_jitter(isc_uint32_t max, isc_uint32_t min, isc_uint32_t jitter) {
isc_uint32_t val;
REQUIRE(jitter > 0);
/*
* Don't allow jitter to be more than max - min.
*/
if (jitter > max - min)
jitter = max - min;
val = rand() % jitter;
return (max - val);
}