Add "tasks" threads and processor
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Key: TS-589
URL: https://issues.apache.org/jira/browse/TS-589
Project: Traffic Server
Issue Type: Improvement
Components: Core
Reporter: Leif Hedstrom
Assignee: Leif Hedstrom
Fix For: 2.1.5
Sometimes, in both the core and in SDK plugins, it might be useful to create
"background tasks". Right now, it's only possible to schedule such tasks
(continuations) on the normal net-threads. This could cause imbalance in thread
"load", particularly for longer running tasks. A new thread type will be
created, ET_TASK, which by default is the same as the net threads (ET_CALL),
but via a records.config option, any continuations scheduled on ET_TASK can be
off-loaded on a new set of threads (a threadpool with a configurable size).
One new configuration option is added, with a default of 0:
CONFIG proxy.config.task_threads INT 0
In addition, more functionality can / should be added to the TasksProcessor, to
make it easy and convenient to use. SDK APIs must also be added (or modified)
to schedule plugin "tasks" on this thread pool.
My initial checkin will be merely a "stub" processor, to get things started.
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