X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=include%2Fbabeltrace%2Fclock-internal.h;h=cd6bdbae03b9d2ecc8ad7f04142378cf280b0a95;hb=e6a63241ead18d0577b4f4cccfa1405c55a663df;hp=6fbc7c32c95143ba2e8ef455a2c65bc358e89432;hpb=75d9ab4b8164f7b2012da916c5b36f1445e9ee09;p=babeltrace.git

diff --git a/include/babeltrace/clock-internal.h b/include/babeltrace/clock-internal.h
index 6fbc7c32..cd6bdbae 100644
--- a/include/babeltrace/clock-internal.h
+++ b/include/babeltrace/clock-internal.h
@@ -20,6 +20,14 @@
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
  */
 
 static inline
@@ -34,4 +42,17 @@ uint64_t clock_cycles_to_ns(struct ctf_clock *clock, uint64_t cycles)
 	}
 }
 
+/*
+ * Note: if using a frequency different from 1GHz for clock->offset, it
+ * is recommended to express the seconds in offset_s, otherwise there
+ * will be a loss of precision caused by the limited size of the double
+ * mantissa.
+ */
+static inline
+uint64_t clock_offset_ns(struct ctf_clock *clock)
+{
+	return clock->offset_s * 1000000000ULL
+			+ clock_cycles_to_ns(clock, clock->offset);
+}
+
 #endif /* _BABELTRACE_CLOCK_INTERNAL_H */