-
Implementation
typedef LttvEventsRequestPrio guint;
typedef struct _EventsRequest {
- gpointer viewer_data;
+ gpointer owner; /* Owner of the request */
+ gpointer viewer_data; /* Unset : NULL */
gboolean servicing; /* service in progress: TRUE */
LttvEventsRequestPrio prio; /* Ev. Req. priority */
- LttTime start_time; /* Unset : { 0, 0 } */
- LttvTracesetContextPosition *start_position; /* Unset : num_traces = 0 */
+ LttTime start_time;/* Unset : { G_MAXUINT, G_MAXUINT }*/
+ LttvTracesetContextPosition *start_position; /* Unset : NULL */
gboolean stop_flag; /* Continue:TRUE Stop:FALSE */
- LttTime end_time; /* Unset : { 0, 0 } */
+ LttTime end_time;/* Unset : { G_MAXUINT, G_MAXUINT } */
guint num_events; /* Unset : G_MAXUINT */
- LttvTracesetContextPosition *end_position; /* Unset : num_traces = 0 */
+ LttvTracesetContextPosition *end_position; /* Unset : NULL */
LttvHooks *before_traceset; /* Unset : NULL */
LttvHooks *before_trace; /* Unset : NULL */
LttvHooks *before_tracefile;/* Unset : NULL */
LttvHooks *after_request /* Unset : NULL */
} EventsRequest;
-
-
- lttvwindow_events_request_remove_all
-It removes all the events requests from the pool that has their "viewer" field
-maching the viewer pointer given in argument.
+It removes all the events requests from the pool that has their "owner" field
+maching the owner pointer given as argument.
It calls the traceset/trace/tracefile end hooks for each request removed if
they are currently serviced.
there is a GTK Event pending and execute it. It can add or remove events
requests from the event requests list. If it happens, we want to start over
the algorithm from the beginning. The after traceset/trace/tracefile hooks are
-called after each interrupted chunk, and before traceset/trace/tracefile are
+called after each chunk, and before traceset/trace/tracefile are
called when the request processing resumes. Before and after request hooks are
called respectively before and after the request processing.
-Two levels of priority exists. High priority and low priority. High prio
-requests are serviced first, even if lower priority requests has lower start
-time or position.
-
Data structures necessary :
list_out : many events requests
-A. While (list_in !empty or list_out !empty) and !GTK Event pending
+// NOT A. While (list_in !empty or list_out !empty) and !GTK Event pending
+
+We do this once, go back to GTK, then get called again...
+We remove the g_idle function when list_in and list_out are empty
+
1. If list_in is empty (need a seek)
1.1 Add requests to list_in
- 1.1.1 Find all time requests with the highest priority and lowest start
- time in list_out (ltime)
- 1.1.2 Find all position requests with the highest priority and lowest
- position in list_out (lpos)
- 1.1.3 If lpos.prio > ltime.prio
- || (lpos.prio == ltime.prio && lpos.start time < ltime)
+ 1.1.1 Find all time requests with lowest start time in list_out (ltime)
+ 1.1.2 Find all position requests with lowest position in list_out (lpos)
+ 1.1.3 If lpos.start time < ltime
- Add lpos to list_in, remove them from list_out
- 1.1.4 Else, (lpos.prio < ltime.prio
- ||(lpos.prio == ltime.prio && lpos.start time >= ltime))
+ 1.1.4 Else, (lpos.start time >= ltime)
- Add ltime to list_in, remove them from list_out
1.2 Seek
1.2.1 If first request in list_in is a time request
- Seek to that time
1.2.2 Else, the first request in list_in is a position request
- If first req in list_in pos != current pos
- - If the position is the same than the saved state, restore state
- - Else, seek to that position
+ - seek to that position
1.3 Add hooks and call before request for all list_in members
1.3.1 If !servicing
- begin request hooks called
3.1 End time
3.1.1 Find lowest end time in list_in
3.1.2 Find lowest start time in list_out (>= than current time*)
- * To eliminate lower prio requests
+ * To eliminate lower prio requests (not used)
3.1.3 Use lowest of both as end time
3.2 Number of events
3.2.1 Find lowest number of events in list_in
- Call end traceset for req
- Call end request for req
- remove req from list_in
- - if exists one events requests in list_out that has
- higher priority and time != current time
- - Use current position as start position for req
- - Remove start time from req
- - Call after_traceset for req
- - Remove event hooks for req
- - Put req back in list_out, remove from list_in
- - Save current state into saved_state.
B. When interrupted
1. for each request in list_in
1.3. Call after_traceset
1.4. Remove event hooks
1.5. Put it back in list_out
- 2. Save current state into saved_state.
- 2.1 Free old saved state.
- 2.2 save current state.
-
-
Weaknesses
-- There is a possibility that we must use seek if more than one interruption
- occurs, i.e. low priority interrupted by addition of high priority, and then
- high priority interrupted. The seek will be necessary for the low priority.
- It could be a good idea to keep one saved_state per priority ?
-
+- ?
Strengths
will typically be NULL, and the typical hook function will be located in a
library upon which the viewer depends.
-A viewer is informed of the completeness of its request by its after_request
-hook registered along with the events request.
+A viewer is informed of the completeness of part of its request by its
+after_traceset hook registered along with the events request. This hook is
+called after the end of each chunk : the viewer will see if the computed data
+suits its needs.
Hooks Lists
and hook_data.
+
+Implementation
+
+Ad Hoc Computation
+
+see lttvwindow_events_delivery.txt
+
+
+Hooks Lists
+
+need new ref_count field with each hook
+lttv_hook_add and lttv_hook_add_list must compare addition with present and
+increment ref counter if already present.
+
+lttv_hook_remove and remove_with_data must decrement ref_count is >1, or remove
+the element otherwise (==1).
+
+
+
+Background Scheduler
+
+Global traces
+
+Two global attributes per trace :
+/traces/path_to_trace/LttvTrace
+ It is a pointer to the LttvTrace structure.
+/traces/path_to_trace/LttvBackgroundComputation
+
+struct _LttvBackgroundComputation {
+ GSList *events_requests;
+ /* A GSList * to the first events request of background computation for a
+ * trace. */
+ LttvTraceset *ts;
+ /* A factice traceset that contains just one trace */
+ LttvTracesetContext *tsc;
+ /* The traceset context that reads this trace */
+}
+
+
+
+
+Modify Traceset
+Points to the global traces. Opens new one only when no instance of the pathname
+exists.
+
+Modify LttvTrace ?
+
+Modify trace opening / close to make them create and destroy
+LttvBackgroundComputation (and call end requests hooks for servicing requests ?)
+
EventsRequest Structure
This structure is the element of the events requests pools. The viewer field is
only modify trace related data structures which are available through the
call_data.
-
-
projects / lttv.git / commitdiff
