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authorAlexander Kuleshov <kuleshovmail@gmail.com>2016-02-05 00:02:39 +0600
committerAlexander Kuleshov <kuleshovmail@gmail.com>2016-02-09 01:15:17 +0600
commit5d634ca8cefb3d738d9efa70dfcc2f67d85d99e9 (patch)
treeca648a970230dd03b23c976e055daa0a76c3efac /src
parentef9fde5378c0b2614991f9e3c4ac525cc07736a8 (diff)
time-util: introduce usec_sub()
The dual_timestamp_from_realtime(), dual_timestamp_from_monotonic() and dual_timestamp_from_boottime_or_monotonic() shares the same code for comparison given ts with delta. Let's move it to the separate inline function to prevent code duplication.
Diffstat (limited to 'src')
-rw-r--r--src/basic/time-util.c26
-rw-r--r--src/basic/time-util.h11
2 files changed, 15 insertions, 22 deletions
diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index 293442cf0e..17352a7a96 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -79,12 +79,7 @@ dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
ts->realtime = u;
delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
- ts->monotonic = now(CLOCK_MONOTONIC);
-
- if ((int64_t) ts->monotonic > delta)
- ts->monotonic -= delta;
- else
- ts->monotonic = 0;
+ ts->monotonic = usec_sub(now(CLOCK_MONOTONIC), delta);
return ts;
}
@@ -100,12 +95,7 @@ dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) {
ts->monotonic = u;
delta = (int64_t) now(CLOCK_MONOTONIC) - (int64_t) u;
-
- ts->realtime = now(CLOCK_REALTIME);
- if ((int64_t) ts->realtime > delta)
- ts->realtime -= delta;
- else
- ts->realtime = 0;
+ ts->realtime = usec_sub(now(CLOCK_REALTIME), delta);
return ts;
}
@@ -120,16 +110,8 @@ dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, us
dual_timestamp_get(ts);
delta = (int64_t) now(clock_boottime_or_monotonic()) - (int64_t) u;
-
- if ((int64_t) ts->realtime > delta)
- ts->realtime -= delta;
- else
- ts->realtime = 0;
-
- if ((int64_t) ts->monotonic > delta)
- ts->monotonic -= delta;
- else
- ts->monotonic = 0;
+ ts->realtime = usec_sub(ts->realtime, delta);
+ ts->monotonic = usec_sub(ts->monotonic, delta);
return ts;
}
diff --git a/src/basic/time-util.h b/src/basic/time-util.h
index 9c7758a959..87440faeee 100644
--- a/src/basic/time-util.h
+++ b/src/basic/time-util.h
@@ -140,3 +140,14 @@ static inline usec_t usec_add(usec_t a, usec_t b) {
return c;
}
+
+static inline usec_t usec_sub(usec_t timestamp, int64_t delta) {
+ if (delta < 0)
+ timestamp = usec_add(timestamp, (usec_t) (-delta));
+ else if (timestamp > (usec_t) delta)
+ timestamp -= delta;
+ else
+ timestamp = 0;
+
+ return timestamp;
+}