Tom,
I just checked the version I'm running (9.1.6), and the code is quite
similar (src/backend/storage/lmgr/s_lock.c)
pg_usleep(cur_delay * 1000L);
#if defined(S_LOCK_TEST)
fprintf(stdout, "*");
fflush(stdout);
#endif
/* increase delay by a random fraction between 1X and 2X */
cur_delay += (int) (cur_delay *
((double) random() / (double) MAX_RANDOM_VALUE) +
0.5);
/* wrap back to minimum delay when max is exceeded */
if (cur_delay > MAX_DELAY_MSEC)
cur_delay = MIN_DELAY_MSEC;
-- vlad
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