dtv-scan-tables.git - dtv-scan-tables Debian packaging

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Diffstat (limited to 'isdb-t/br-ce-Forquilha')

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1 files changed, 32 insertions, 0 deletions

/* $Id$ * $URL$ * * generic timer handling * * 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 (void(*callback)(void *data), void *data, int interval, int one_shot); * adds a timer to the queue * * int timer_process (struct timespec *delay); * process timer queue * * int timer_remove(void (*callback) (void *data), void *data); * remove a timer with given callback and data * * int timer_add_late(void (*callback) (void *data), void *data, const int interval, const int one_shot) * same as timer_add, but the one shot does not fire now (useful for scheduling things) * * void timer_exit(); * release all timers * */ #include "config.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #include <sys/time.h> #include <time.h> #include "debug.h" #include "cfg.h" #include "timer.h" #ifdef WITH_DMALLOC #include <dmalloc.h> #endif #define CLOCK_SKEW_DETECT_TIME_IN_S 1 typedef struct TIMER { void (*callback) (void *data); void *data; struct timeval when; int interval; int one_shot; int active; } TIMER; TIMER *Timers = NULL; int nTimers = 0; static void timer_inc(struct timeval *tv, const int msec) { tv->tv_sec += msec / 1000; tv->tv_usec += (msec - 1000 * (msec / 1000)) * 1000; if (tv->tv_usec >= 1000000) { tv->tv_usec -= 1000000; tv->tv_sec++; } } int timer_remove(void (*callback) (void *data), void *data) { int i; for (i = 0; i < nTimers; i++) { if (Timers[i].callback == callback && Timers[i].data == data && Timers[i].active) { Timers[i].active = 0; return 0; } } return -1; } int timer_add_late(void (*callback) (void *data), void *data, const int interval, const int one_shot) { if (!timer_add(callback, data, interval, 1)) { return -1; } if (one_shot) { return 0; } int i; for (i = 0; i < nTimers; i++) { if (Timers[i].callback == callback && Timers[i].data == data && Timers[i].active && Timers[i].interval == interval && Timers[i].one_shot) { //we forced it to one_shot when adding to make it late (which gives us the alternate behavior) Timers[i].one_shot = one_shot; return 0; } } return -1; } int timer_add(void (*callback) (void *data), void *data, const int interval, const int one_shot) { int i; struct timeval now; /* find a free slot */ for (i = 0; i < nTimers; i++) { if (Timers[i].active == 0) break; } /* none found, allocate a new slot */ if (i >= nTimers) { nTimers++; Timers = realloc(Timers, nTimers * sizeof(*Timers)); } gettimeofday(&now, NULL); /* fill slot */ Timers[i].callback = callback; Timers[i].data = data; Timers[i].when = now; Timers[i].interval = interval; Timers[i].one_shot = one_shot; Timers[i].active = 1; /* if one-shot timer, don't fire now */ if (one_shot) { timer_inc(&Timers[i].when, interval); } return 0; } int timer_process(struct timespec *delay) { int i, flag, min; struct timeval now; /* the current moment */ gettimeofday(&now, NULL); /* sanity check */ if (nTimers == 0) { error("huh? not one single timer to process? dazed and confused..."); return -1; } /* process expired timers */ flag = 0; for (i = 0; i < nTimers; i++) { if (Timers[i].active == 0) continue; if (timercmp(&Timers[i].when, &now, <=)) { flag = 1; /* callback */ if (Timers[i].callback != NULL) { Timers[i].callback(Timers[i].data); } /* respawn or delete timer */ if (Timers[i].one_shot) { Timers[i].active = 0; } else { Timers[i].when = now; timer_inc(&Timers[i].when, Timers[i].interval); } } } /* find next timer */ flag = 1; min = -1; for (i = 0; i < nTimers; i++) { if (Timers[i].active == 0) continue; if (flag || timercmp(&Timers[i].when, &Timers[min].when, <)) { flag = 0; min = i; } } if (min < 0) { error("huh? not one single timer left? dazed and confused..."); return -1; } /* delay until next timer event */ delay->tv_sec = Timers[min].when.tv_sec - now.tv_sec; delay->tv_nsec = Timers[min].when.tv_usec - now.tv_usec; if (delay->tv_nsec < 0) { delay->tv_sec--; delay->tv_nsec += 1000000; } /* nanoseconds!! */ delay->tv_nsec *= 1000; /* check if date changed */ if ((delay->tv_sec) > CLOCK_SKEW_DETECT_TIME_IN_S) { delay->tv_sec = 0; delay->tv_nsec = 0; info("Oops, clock skewed, update timestamp"); gettimeofday(&now, NULL); Timers[min].when = now; } return 0; } void timer_exit(void) { nTimers = 0; if (Timers != NULL) { free(Timers);; Timers = NULL; } }


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