diff options
| -rw-r--r-- | src/port/pgsleep.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/port/pgsleep.c b/src/port/pgsleep.c index 8a709cd01df..b34efeae8cd 100644 --- a/src/port/pgsleep.c +++ b/src/port/pgsleep.c @@ -25,9 +25,10 @@ /* * pg_usleep --- delay the specified number of microseconds. * - * NOTE: although the delay is specified in microseconds, the effective - * resolution is only 1/HZ, or 10 milliseconds, on most Unixen. Expect - * the requested delay to be rounded up to the next resolution boundary. + * NOTE: Although the delay is specified in microseconds, older Unixen and + * Windows use periodic kernel ticks to wake up, which might increase the delay + * time significantly. We've observed delay increases as large as 20 + * milliseconds on supported platforms. * * On machines where "long" is 32 bits, the maximum delay is ~2000 seconds. * |