Commits on May 30, 2022

1. task: add consume_budget for cooperative scheduling …

   For cpu-only computations that do not use any Tokio resources,
   budgeting does not really kick in in order to yield and prevent
   other tasks from starvation. The new mechanism - consume_budget,
   performs a budget check, consumes a unit of it, and yields only
   if the task exceeded the budget. That allows cpu-intenstive
   computations to define points in the program which indicate that
   some significant work was performed. It will yield only if the budget
   is gone, which is a much better alternative to unconditional yielding,
   which is a potentially heavy operation.

   

   psarna committed May 30, 2022
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2. tests: add a test case for task::consume_budget …

   The test case ensures that the task::consume_budget utility
   actually burns budget and makes the task yield once the whole
   budget is gone.

   

   psarna committed May 30, 2022
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