lcd4linux.git - lcd4linux

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1 files changed, 2 insertions, 3 deletions

/* $Id$ * $URL$ * * generic grouping of widget timers that have been set to the same * update interval, thus allowing synchronized updates * * Copyright (C) 2010 Martin Zuther <code@mzuther.de> * * Based on "timer.c" which is * Copyright (C) 2003, 2004 Michael Reinelt <michael@reinelt.co.at> * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ /* * exported functions: * * int timer_add_group(void (*callback) (void *data), const int interval) * make sure that generic timer exists for given update interval * * int timer_remove_group(void (*callback) (void *data), const int interval) * remove generic timer for given update interval * * void timer_process_group(void *data) * process all widgets of a given update interval (*data) * * void timer_exit_group(void) * release all timers and free reserved memory * * int timer_add_widget(void (*callback) (void *data), void *data, const int interval, const int one_shot) * add widget to group of the given update interval (creates a new group if * necessary) * * int timer_remove_widget(void (*callback) (void *data), void *data) * remove widget from group of the given update interval (als removes emtpy * groups) * */ #include "config.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #include "debug.h" #include "cfg.h" #include "timer.h" #include "timer_group.h" #ifdef WITH_DMALLOC #include <dmalloc.h> #endif /* contains the actual timers, one for each update interval */ typedef struct TIMER_GROUP { void (*callback) (void *data); int *interval; int active; } TIMER_GROUP; TIMER_GROUP *GroupTimers = NULL; int nGroupTimers = 0; /* contains callback and data for each widget */ typedef struct SINGLE_TIMER { void (*callback) (void *data); void *data; int interval; int one_shot; int active; } SINGLE_TIMER; SINGLE_TIMER *SingleTimers = NULL; int nSingleTimers = 0; int timer_add_group(void (*callback) (void *data), const int interval) { int group; /* check whether timer exists for given update interval */ for (group = 0; group < nGroupTimers; group++) { if (*GroupTimers[group].interval == interval) return 0; } /* otherwise look for a free group */ for (group = 0; group < nGroupTimers; group++) { if (GroupTimers[group].active == 0) break; } /* none found, allocate a new group */ if (group >= nGroupTimers) { nGroupTimers++; GroupTimers = realloc(GroupTimers, nGroupTimers * sizeof(*GroupTimers)); /* also allocate memory for callback data */ GroupTimers[group].interval = malloc(sizeof(int)); } /* initialize group */ info("Creating new timer group (%d ms)", interval); GroupTimers[group].callback = callback; *GroupTimers[group].interval = interval; GroupTimers[group].active = 1; /* finally, request a generic timer */ return timer_add(GroupTimers[group].callback, GroupTimers[group].interval, interval, 0); } int timer_remove_group(void (*callback) (void *data), const int interval) { int group; /* look for group with given callback function and update interval */ for (group = 0; group < nGroupTimers; group++) { if (GroupTimers[group].callback == callback && *GroupTimers[group].interval == interval && GroupTimers[group].active) { /* inactivate group */ GroupTimers[group].active = 0; /* remove generic timer */ return timer_remove(GroupTimers[group].callback, GroupTimers[group].interval); } } return -1; } void timer_process_group(void *data) { int slot; int *interval = (int *) data; /* sanity check */ if (nSingleTimers == 0) { error("huh? not even a single widget timer to process? dazed and confused..."); return; } /* process every (active) widget associated with given update interval */ for (slot = 0; slot < nSingleTimers; slot++) { if (SingleTimers[slot].active == 0) continue; if (SingleTimers[slot].interval == *interval) { /* call one-shot timers only once */ if (SingleTimers[slot].one_shot) SingleTimers[slot].active = 0; /* execute callback function */ if (SingleTimers[slot].callback != NULL) SingleTimers[slot].callback(SingleTimers[slot].data); } } } int timer_add_widget(void (*callback) (void *data), void *data, const int interval, const int one_shot) { int slot; /* make sure that group for update interval exists or can be created */ if (timer_add_group(timer_process_group, interval) != 0) return -1; /* find a free slot for callback data */ for (slot = 0; slot < nSingleTimers; slot++) { if (SingleTimers[slot].active == 0) break; } /* none found, allocate a new slot */ if (slot >= nSingleTimers) { nSingleTimers++; SingleTimers = realloc(SingleTimers, nSingleTimers * sizeof(*SingleTimers)); } /* fill slot with callback data */ SingleTimers[slot].callback = callback; SingleTimers[slot].data = data; SingleTimers[slot].interval = interval; SingleTimers[slot].one_shot = one_shot; SingleTimers[slot].active = 1; return 0; } int timer_remove_widget(void (*callback) (void *data), void *data) { int slot, interval; interval = 0; /* look for (active) widget with given callback function and data */ for (slot = 0; slot < nSingleTimers; slot++) { if (SingleTimers[slot].callback == callback && SingleTimers[slot].data == data && SingleTimers[slot].active) { /* deactivate widget */ SingleTimers[slot].active = 0; interval = SingleTimers[slot].interval; break; } } /* signal an error if no matching widget was found */ if (interval == 0) return -1; /* look for other widgets with given update interval */ for (slot = 0; slot < nSingleTimers; slot++) { if (SingleTimers[slot].active == 0) continue; /* at least one other widget with given update interval exists */ if (SingleTimers[slot].interval == interval) return 0; } /* remove group with given update interval */ return timer_remove_group(timer_process_group, interval); } void timer_exit_group(void) { int group; /* remove generic timer and free memory for callback data */ for (group = 0; group < nGroupTimers; group++) { timer_remove(GroupTimers[group].callback, GroupTimers[group].interval); free(GroupTimers[group].interval); } /* free memory for groups */ nGroupTimers = 0; if (GroupTimers != NULL) { free(GroupTimers);; GroupTimers = NULL; } /* free memory for widget callback data */ nSingleTimers = 0; if (SingleTimers != NULL) { free(SingleTimers);; SingleTimers = NULL; } }


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