 when the task function has executed. The effect of this is that if you have some rapid high-priority event that needs to trigger something to happen at low-priority, <a class="el" href="group__threading.html#gaa24a0c9896f1ad241e45590065c3f643" title="Defer execution of a function to the main thread if (and only if) your function is executing in the s...">defer()</a> will ensure that this low-priority task happens every time the high-priority event occurs (in a 1:1 ratio), whereas using a qelem will only ru