Merge 3.16 branch into 7.0

documentation/RELEASE_NOTES.html

@@ -112,6 +112,25 @@ be happy to try and answer them!</p>
 
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+<h3>Status reporting for the callback and scanOnce task queues</h3>
+
+<p>Two new iocsh commands and some associated underlying APIs have been added to
+show the state of the queues that feed the three callback tasks and the scanOnce
+task, including a high-water mark which can optionally be reset. The new iocsh
+commands are <tt>callbackQueueShow</tt> and <tt>scanOnceQueueShow</tt>; both
+take an optional integer argument which must be non-zero to reset the
+high-water mark.</p>
+
+<h3>Support for event codes greater than or equal to NUM_TIME_EVENTS</h3>
+
+<p>Event numbers greater than or equal to NUM_TIME_EVENTS are now allowed if
+supported by the registered event time provider, which must provide its own
+advancing timestamp validation for such events.</p>
+
+<p>Time events numbered 0 through (NUM_TIME_EVENTS-1) are still validated by
+code in epicsGeneralTime.c that checks for advancing timestamps and enforces
+that restriction.</p>
+
 <h3>Type-safe Device and Driver Support Tables</h3>
 
 <p>Type-safe versions of the device and driver support structures <tt>dset</tt>