The reading processes are waiting on a named_condition that indicates the possibility to read. Problem is now that they wait until doomsday if no one triggers notify. So they can't quit the reading process themselves.
I always use a special "quit" message sent in the normal mechanism that it uses to send work. Also, I always advise waiting on a special "error" flag in addition to whatever you are really waiting for, when you block. That allows exceptions to always be able to un-stick the workers. TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.