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Diffstat (limited to 'src/core/timer.c')
-rw-r--r--src/core/timer.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/core/timer.c b/src/core/timer.c
index 0587452cfb..6b0f8e8616 100644
--- a/src/core/timer.c
+++ b/src/core/timer.c
@@ -27,6 +27,7 @@
#include "dbus-timer.h"
#include "fs-util.h"
#include "parse-util.h"
+#include "random-util.h"
#include "special.h"
#include "string-table.h"
#include "string-util.h"
@@ -330,6 +331,28 @@ static usec_t monotonic_to_boottime(usec_t t) {
return 0;
}
+static void add_random(Timer *t, usec_t *v) {
+ char s[FORMAT_TIMESPAN_MAX];
+ usec_t add;
+
+ assert(t);
+ assert(*v);
+
+ if (t->random_usec == 0)
+ return;
+ if (*v == USEC_INFINITY)
+ return;
+
+ add = random_u64() % t->random_usec;
+
+ if (*v + add < *v) /* overflow */
+ *v = (usec_t) -2; /* Highest possible value, that is not USEC_INFINITY */
+ else
+ *v += add;
+
+ log_unit_info(UNIT(t), "Adding %s random time.", format_timespan(s, sizeof(s), add, 0));
+}
+
static void timer_enter_waiting(Timer *t, bool initial) {
bool found_monotonic = false, found_realtime = false;
usec_t ts_realtime, ts_monotonic;
@@ -452,6 +475,8 @@ static void timer_enter_waiting(Timer *t, bool initial) {
char buf[FORMAT_TIMESPAN_MAX];
usec_t left;
+ add_random(t, &t->next_elapse_monotonic_or_boottime);
+
left = t->next_elapse_monotonic_or_boottime > ts_monotonic ? t->next_elapse_monotonic_or_boottime - ts_monotonic : 0;
log_unit_debug(UNIT(t), "Monotonic timer elapses in %s.", format_timespan(buf, sizeof(buf), left, 0));
@@ -486,6 +511,9 @@ static void timer_enter_waiting(Timer *t, bool initial) {
if (found_realtime) {
char buf[FORMAT_TIMESTAMP_MAX];
+
+ add_random(t, &t->next_elapse_realtime);
+
log_unit_debug(UNIT(t), "Realtime timer elapses at %s.", format_timestamp(buf, sizeof(buf), t->next_elapse_realtime));
if (t->realtime_event_source) {