belliottsmith commented on code in PR #4869:
URL: https://github.com/apache/cassandra/pull/4869#discussion_r3373075999
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src/java/org/apache/cassandra/concurrent/SEPExecutor.java:
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@@ -123,18 +123,9 @@ protected <T extends Runnable> T addTask(T task)
// we add to the queue first, so that when a worker takes a task
permit it can be certain there is a task available
// this permits us to schedule threads non-spuriously; it also means
work is serviced fairly
tasks.add(task);
- int taskPermits;
- while (true)
- {
- long current = permits.get();
- taskPermits = taskPermits(current);
- // because there is no difference in practical terms between the
work permit being added or not (the work is already in existence)
- // we always add our permit, but block after the fact if we
breached the queue limit
- if (permits.compareAndSet(current, updateTaskPermits(current,
taskPermits + 1)))
- break;
- }
- if (taskPermits == 0)
+ long current = permits.getAndAdd(updateTaskPermits(0, 1));
Review Comment:
maybe prev now, since we've already updated it this way?
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