Adds the given number of microseconds to @time_. @microseconds can also be negative to decrease the value of @time_.
number of microseconds to add to @time
Deprecated: #GTimeVal is not year-2038-safe. Use guint64 for representing microseconds since the epoch, or use #GDateTime.
See Implementation
Adds the given number of microseconds to @time_. @microseconds can also be negative to decrease the value of @time_.