From: Susant Sahani <ssahani@gmail.com>
Date: Tue, 3 Nov 2015 16:28:42 +0000 (+0530)
Subject: Time-util: introduce usec to jiffies
X-Git-Tag: v228~100^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=87b8ce69f6684f698b699ce662c72de78ed43343;p=thirdparty%2Fsystemd.git

Time-util: introduce usec to jiffies
---

diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index 9dc280efc65..e629d91cb22 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -1122,3 +1122,17 @@ time_t mktime_or_timegm(struct tm *tm, bool utc) {
 struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc) {
         return utc ? gmtime_r(t, tm) : localtime_r(t, tm);
 }
+
+unsigned long usec_to_jiffies(usec_t u) {
+        static thread_local unsigned long hz = 0;
+        long r;
+
+        if (hz == 0) {
+                r = sysconf(_SC_CLK_TCK);
+
+                assert(r > 0);
+                hz = (unsigned long) r;
+        }
+
+        return DIV_ROUND_UP(u , USEC_PER_SEC / hz);
+}
diff --git a/src/basic/time-util.h b/src/basic/time-util.h
index 417376ea965..925bf18eb25 100644
--- a/src/basic/time-util.h
+++ b/src/basic/time-util.h
@@ -121,3 +121,5 @@ int get_timezone(char **timezone);
 
 time_t mktime_or_timegm(struct tm *tm, bool utc);
 struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc);
+
+unsigned long usec_to_jiffies(usec_t usec);