mirror of https://github.com/BOINC/boinc.git
76 lines
2.4 KiB
PHP
76 lines
2.4 KiB
PHP
<?
|
|
require_once("docutil.php");
|
|
page_head("Core client: main loop logic");
|
|
echo "
|
|
<p>
|
|
The main loop of the core client repeatedly calls the following function:
|
|
<pre>
|
|
bool CLIENT_STATE::do_something() {
|
|
bool action=false;
|
|
|
|
if (check_suspend_activities()) return false;
|
|
action |= net_xfers->poll();
|
|
action |= http_ops->poll();
|
|
action |= file_xfers->poll();
|
|
action |= active_tasks->poll();
|
|
action |= scheduler_rpcs->poll();
|
|
action |= start_apps();
|
|
action |= pers_xfers->poll();
|
|
action |= handle_running_apps();
|
|
action |= handle_pers_file_xfers();
|
|
action |= garbage_collect();
|
|
write_state_file_if_needed();
|
|
return action;
|
|
}
|
|
</pre>
|
|
|
|
<p>
|
|
This function initiates new activities as needed,
|
|
and checks for the completion of current activities.
|
|
It is to be called periodically from either a sleep loop
|
|
(command-line program) or timer handler of event loop (GUI program).
|
|
It returns true if any change occurred,
|
|
in which case it should be called again without sleeping.
|
|
|
|
<p>
|
|
The various functions called are as follows:
|
|
|
|
<p>
|
|
<b>check_suspend_activities</b> checks for conditions such as
|
|
recent mouse/keyboard input, or running on batteries,
|
|
in which user preferences dictate that no work be done.
|
|
<p>
|
|
<b>net_xfers->poll(), http_ops->poll(), file_xfers->poll()
|
|
and pers_xfers->poll()</b>
|
|
manage the internal transitions of the various FSM layers.
|
|
<p>
|
|
<b>start_apps()</b> checks whether it's possible to start an
|
|
application, i.e. a CPU slot is vacant
|
|
and there's a result with all its input files present.
|
|
If so it starts the application.
|
|
<p>
|
|
<b>handle_running_apps()</b> checks whether a running application
|
|
has exited, and if so cleans up after it.
|
|
<p>
|
|
<b>handle_pers_file_xfers()</b>
|
|
starts new file transfers as needed.
|
|
<p>
|
|
<b>garbage_collect()</b>
|
|
checks for objects that can be discarded.
|
|
For example, if a file is non-sticky and is no longer
|
|
referenced by any work units or results, both the FILE_INFO
|
|
and the underlying file can be deleted.
|
|
If a result has been completed and acknowledged,
|
|
the RESULT object can be deleted.
|
|
<p>
|
|
<b>write_state_file_if_needed()</b>:
|
|
any of the above functions that changes state in a way that
|
|
should be written to client_state.xml
|
|
(e.g. that needs to survive this execution of the core client)
|
|
sets a flag <b>client_state_dirty</b>.
|
|
write_state_file_if_needed() writes client_state.xml if
|
|
this flag is set.
|
|
";
|
|
page_tail();
|
|
?>
|