Let's assume that there are two requests in the queue with execution time t1 and t2.
The timer is set to t1. The timer is triggered, schedules the t1 request,
calculates the time for the next timer t2 to be triggered.
But it doesn't schedules timer to this time because of the
`q.timeBasedScheduleTs > nextTs` check.
Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>
There is a possible call-chain `scheduleRequest()` -> `runAt()` -> `scheduleRequest()`,
so second `scheduleRequest()` may be locked on mutext held by first `scheduleRequest()`.
Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>
