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Overview:
The scheduling service can run in one of two different modes of
operation, an off-line configuration mode, and a run-time execution mode.
The application uses the Scheduler_Factory to specify in which mode
it would like to use the scheduling service.
In the configuration mode, the application registers RT_Infos containing
operation characteristics with the off-line scheduler, and also specifies
operation dependencies. The Event Channel also registers RT_Infos for its
own operations, and specifies any additional dependencies introduced by
subscription or event correllation.
Once all operations are registered, the application invokes the
scheduler's compute_scheduling method. The scheduler generates a
"schedule" consisting of operation priorities and sub-priorities, and
determines whether or not the schedule is feasible. The scheduler also
produces queue specification information that can be used to configure
the dispatching module's number and kinds of queues (this
automatic dispatching module configuration will appear in a TAO release
*very* soon). The application then may ask the config scheduler to dump
it's schedule to a header file.
The Sched_Conf.cpp file in this directory is an example of how this is done.
Building and running the Sched_Conf executable will produce a header file
called Sched_Conf_Runtime.h, which is included by Sched_Conf_Runtime.cpp.
The dumped header file contains tables with the static scheduling and
configuration information. The Sched_Conf_Runtime application passes this
information to the run-time scheduler at start-up. The application may also
re-register its operations to verify the correct operations were loaded. The
Sched_Conf_Runtime does this, and in fact exercises a number of methods
of the run-time scheduler to ensure it gives correct responses for the
table of operations with which it was instantiated.
Program operation:
build Sched_Conf
run Sched_Conf
build Sched_Conf_Runtime
run Sched_Conf_Runtime
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