from upstream */

the behavior is undefined if a packet is already double tagged

error codes: -1 is Quota exceeded. The objects have been enqueued, but the high water mark is exceeded. -2 is not enough room in the ring to enqueue;

* Defers/disables SIG_THREAD_EXIT for any code path that * needs to make sure system calls *aren't* interrupted. */

Push an unused entry index back to the stack

Get a message from parent or child, a la Send(), except that we create a std::string from it.

Receives a string. Returns true if it gets one. See SendString.

Returns true if child was removed successfully.

Remove key from the bucket indexed by bucket_idx Return true if success.

! * Re-sets state to allow re-firing thread. USE WITH CAUTION! * Returns false if you called it inappropriately, true if it * did the reset.

! * Re-sets state to allow re-firing thread. USE WITH CAUTION! * Returns false if you called it inappropriately, true if it * did the reset.

Resets all counters, and the count of such counters. Note that the number of buckets remains unchanged.

Resize the histogram. Note that this resets it (i.e., this does not attempt to redistribute existing counts).

Gets the next object from the queue and determines based on current state, whether set the passed drop boolean to true(to tell the calling function to