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examples/trickle-library: correct probability expression

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Documented intent is to update with probability 1/NEW_TOKEN_PROB where
NEW_TOKEN_PROB is 0x80.  The current implementation updates with probability
1/2.  Update NEW_TOKEN_PROB and the expression to keep existing behavior
while correcting the calculation.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This commit is contained in:
Peter A. Bigot 2013-06-17 13:03:37 -05:00
parent 807293ab6d
commit eecb2c6183
1 changed files with 2 additions and 2 deletions
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4
examples/trickle-library/trickle-library.c
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@ -70,7 +70,7 @@ static uip_ipaddr_t ipaddr; /* destination: link-local all-nodes multicast *
* with probability 1/NEW_TOKEN_PROB. This is controlled by etimer et. * with probability 1/NEW_TOKEN_PROB. This is controlled by etimer et.
*/ */
#define NEW_TOKEN_INTERVAL 10 * CLOCK_SECOND #define NEW_TOKEN_INTERVAL 10 * CLOCK_SECOND
#define NEW_TOKEN_PROB 0x80 #define NEW_TOKEN_PROB 2
static uint8_t token; static uint8_t token;
static struct etimer et; /* Used to periodically generate inconsistencies */ static struct etimer et; /* Used to periodically generate inconsistencies */
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
@ -180,7 +180,7 @@ PROCESS_THREAD(trickle_protocol_process, ev, data)
} else if(etimer_expired(&et)) { } else if(etimer_expired(&et)) {
/* Periodically (and randomly) generate a new token. This will trigger /* Periodically (and randomly) generate a new token. This will trigger
* a trickle inconsistency */ * a trickle inconsistency */
if((random_rand() & NEW_TOKEN_PROB) == 0) { if((random_rand() % NEW_TOKEN_PROB) == 0) {
token++; token++;
PRINTF("At %lu: Generating a new token 0x%02x\n", PRINTF("At %lu: Generating a new token 0x%02x\n",
(unsigned long)clock_time(), token); (unsigned long)clock_time(), token);