void lttvwindow_events_request
-( MainWindow *main_win,
- EventsRequest *events_request);
-
-void lttvwindow_events_request
-( MainWindow *main_win,
- EventsRequest events_request);
+( Tab *tab,
+ const EventsRequest *events_request);
void lttvwindow_events_request_remove_all
-( MainWindow *main_win,
- gpointer viewer);
+( Tab *tab,
+ gconstpointer viewer);
Internal functions :
A background computation request is asked via lttvwindow_events_request, with a
priority field set with a low priority.
-If a lttvwindow_events_request_remove_all is done on the viewer pointer, it will
+In the case of a background computation with viewer pointer field set to NULL,
+if a lttvwindow_events_request_remove_all is done on the viewer pointer, it will
not affect the state computation as no viewer pointer will have been passed in
the initial request. This is the expected result. For the background processings
that call viewer's hooks, they will be removed.
+Tab change
+
+If a tab change occurs, we still want to do background processing.
+Events requests must be stocked in a list located in the same scope than the
+traceset context. Right now, this is tab scope. All functions called from the
+request servicing function must _not_ use the current_tab concept, as it may
+change. The idle function must the take a tab, and not the main window, as
+parameter.
+
+If a tab is removed, its associated idle events requests servicing function must
+also be removed.
+
+It now looks a lot more useful to give a Tab* to the viewer instead of a
+MainWindow*, as all the information needed by the viewer is located at the tab
+level. It will diminish the dependance upon the current tab concept.
+
+
+
+Idle function (lttvwindow_process_pending_requests)
+
+The idle function must return FALSE to be removed from the idle functions when
+no more events requests are pending. Otherwise, it returns TRUE. It will service
+requests until there is no more request left.
+
+
+
Implementation
- lttvwindow_events_request
-It adds the an EventsRequest struct to the array of time requests
+It adds the an EventsRequest struct to the list of events requests
pending and registers a pending request for the next g_idle if none is
registered. The viewer can access this structure during the read as its
hook_data. Only the stop_flag can be changed by the viewer through the
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_tracefile; /* Unset : NULL */
LttvHooks *after_trace; /* Unset : NULL */
LttvHooks *after_traceset; /* Unset : NULL */
- LttvHooks *before_chunk; /* Unset : NULL */
- LttvHooks *after_chunk /* Unset : NULL */
+ LttvHooks *before_request; /* 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.
+It calls the traceset/trace/tracefile end hooks for each request removed if
+they are currently serviced.
- lttvwindow_process_pending_requests
The reads are splitted in chunks. After a chunk is over, we want to check if
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.
-
-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.
+the algorithm from the beginning. The after traceset/trace/tracefile hooks 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.
Data structures necessary :
list_out : many events requests
-A. While list_in !empty and 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
- 1.3 Add hooks and call begin for all list_in members
+ - seek to that position
+ 1.3 Add hooks and call before request for all list_in members
1.3.1 If !servicing
- - begin hooks called
+ - begin request hooks called
- servicing = TRUE
- 1.3.2 call before_chunk
+ 1.3.2 call before_traceset
1.3.3 events hooks added
2. Else, list_in is not empty, we continue a read
2.1 For each req of list_out
- if req.start time == current context time
- Add to list_in, remove from list_out
- If !servicing
- - Call begin
+ - Call begin request
- servicing = TRUE
- - Call before_chunk
+ - Call before_traceset
- events hooks added
- if req.start position == current position
- Add to list_in, remove from list_out
- If !servicing
- - Call begin
+ - Call begin request
- servicing = TRUE
- - Call before_chunk
+ - Call before_traceset
- events hooks added
3. Find end criterions
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
5. After process traceset middle
- if current context time > traceset.end time
- For each req in list_in
- - Call end for req
- Remove events hooks for req
+ - Call end traceset for req
+ - Call end request for req
- remove req from list_in
5.1 For each req in list_in
- req.num -= count
- if req.num == 0
- - Call end for req
- Remove events hooks for req
+ - Call end traceset for req
+ - Call end request for req
- remove req from list_in
- if current context time > req.end time
- - Call end for req
- Remove events hooks for req
+ - Call end traceset for req
+ - Call end request for req
- remove req from list_in
- if req.end pos == current pos
- - Call end for req
- Remove events hooks for req
+ - Call end traceset for req
+ - Call end request for req
- remove req from list_in
- if req.stop_flag == TRUE
- - Call end for req
- Remove events hooks for req
+ - 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_chunk 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
1.1. Use current postition as start position
1.2. Remove start time
- 1.3. Call after_chunk
+ 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
-- None (nearly?) :)
-
+- ?
Strengths
projects / lttv.git / blobdiff