Threadsafe, fair, LIFO queue. Meant to be used by ConnectionPool
with which it shares a Monitor.
- A
- C
- D
- N
- P
Add element
to the queue. Never blocks.
Test if any threads are currently waiting on the queue.
Remove all elements from the queue.
If element
is in the queue, remove and return it, or nil
.
Returns the number of threads currently waiting on this queue.
Remove the head of the queue.
If timeout
is not given, remove and return the head the queue if the number of available elements is strictly greater than the number of threads currently waiting (that is, don't jump ahead in line). Otherwise, return nil
.
If timeout
is given, block if there is no element available, waiting up to timeout
seconds for an element to become available.
Raises:
-
ActiveRecord::ConnectionTimeoutError
iftimeout
is given and no element
becomes available within timeout
seconds,