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Diffstat (limited to 'atari/schedule.c')
| -rw-r--r-- | atari/schedule.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/atari/schedule.c b/atari/schedule.c new file mode 100644 index 000000000..e72e1bcbe --- /dev/null +++ b/atari/schedule.c @@ -0,0 +1,223 @@ +/* + * Copyright 2008 Vincent Sanders <vince@simtec.co.uk> + * + * This file is part of NetSurf, http://www.netsurf-browser.org/ + * + * NetSurf 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; version 2 of the License. + * + * NetSurf 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, see <http://www.gnu.org/licenses/>. + */ + +#include <sys/time.h> +#include <time.h> + +#include "desktop/browser.h" +#include "atari/schedule.h" + +#include "utils/log.h" + +/* linked list of scheduled callbacks */ +static struct nscallback *schedule_list = NULL; + +/** + * scheduled callback. + */ +struct nscallback +{ + struct nscallback *next; + struct timeval tv; + void (*callback)(void *p); + void *p; +}; + + +/** + * Schedule a callback. + * + * \param tival interval before the callback should be made / cs + * \param callback callback function + * \param p user parameter, passed to callback function + * + * The callback function will be called as soon as possible after t cs have + * passed. + */ + +void schedule(int cs_ival, void (*callback)(void *p), void *p) +{ + struct nscallback *nscb; + struct timeval tv; + + tv.tv_sec = cs_ival / 100; /* cs to seconds */ + tv.tv_usec = (cs_ival % 100) * 10000; /* remainder to microseconds */ + + nscb = calloc(1, sizeof(struct nscallback)); + + LOG(("adding callback %p for %p(%p) at %d cs", nscb, callback, p, cs_ival)); + + gettimeofday(&nscb->tv, NULL); + timeradd(&nscb->tv, &tv, &nscb->tv); + + nscb->callback = callback; + nscb->p = p; + + /* add to list front */ + nscb->next = schedule_list; + schedule_list = nscb; +} + +/** + * Unschedule a callback. + * + * \param callback callback function + * \param p user parameter, passed to callback function + * + * All scheduled callbacks matching both callback and p are removed. + */ + +void schedule_remove(void (*callback)(void *p), void *p) +{ + struct nscallback *cur_nscb; + struct nscallback *prev_nscb; + struct nscallback *unlnk_nscb; + + if (schedule_list == NULL) + return; + + LOG(("removing %p, %p", callback, p)); + + cur_nscb = schedule_list; + prev_nscb = NULL; + + while (cur_nscb != NULL) { + if ((cur_nscb->callback == callback) && + (cur_nscb->p == p)) { + /* item to remove */ + + LOG(("callback entry %p removing %p(%p)", + cur_nscb, cur_nscb->callback, cur_nscb->p)); + + /* remove callback */ + unlnk_nscb = cur_nscb; + cur_nscb = unlnk_nscb->next; + + if (prev_nscb == NULL) { + schedule_list = cur_nscb; + } else { + prev_nscb->next = cur_nscb; + } + free (unlnk_nscb); + } else { + /* move to next element */ + prev_nscb = cur_nscb; + cur_nscb = prev_nscb->next; + } + } +} + +/** + * Process events up to current time. + */ + +int +schedule_run(void) +{ + struct timeval tv; + struct timeval nexttime; + struct timeval rettime; + struct nscallback *cur_nscb; + struct nscallback *prev_nscb; + struct nscallback *unlnk_nscb; + + if (schedule_list == NULL) + return -1; + + /* reset enumeration to the start of the list */ + cur_nscb = schedule_list; + prev_nscb = NULL; + nexttime = cur_nscb->tv; + + gettimeofday(&tv, NULL); + + while (cur_nscb != NULL) { + if (timercmp(&tv, &cur_nscb->tv, >)) { + /* scheduled time */ + + /* remove callback */ + unlnk_nscb = cur_nscb; + + if (prev_nscb == NULL) { + schedule_list = unlnk_nscb->next; + } else { + prev_nscb->next = unlnk_nscb->next; + } + + LOG(("callback entry %p running %p(%p)", + unlnk_nscb, unlnk_nscb->callback, unlnk_nscb->p)); + /* call callback */ + unlnk_nscb->callback(unlnk_nscb->p); + + free(unlnk_nscb); + + /* need to deal with callback modifying the list. */ + if (schedule_list == NULL) { + LOG(("schedule_list == NULL")); + return -1; /* no more callbacks scheduled */ + } + + /* reset enumeration to the start of the list */ + cur_nscb = schedule_list; + prev_nscb = NULL; + nexttime = cur_nscb->tv; + } else { + /* if the time to the event is sooner than the + * currently recorded soonest event record it + */ + if (timercmp(&nexttime, &cur_nscb->tv, >)) { + nexttime = cur_nscb->tv; + } + /* move to next element */ + prev_nscb = cur_nscb; + cur_nscb = prev_nscb->next; + } + } + + /* make rettime relative to now */ + timersub(&nexttime, &tv, &rettime); + + LOG(("returning time to next event as %ldms",(rettime.tv_sec * 1000) + (rettime.tv_usec / 1000))); + /*return next event time in milliseconds (24days max wait) */ + return (rettime.tv_sec * 1000) + (rettime.tv_usec / 1000); +} + +void list_schedule(void) +{ + struct timeval tv; + struct nscallback *cur_nscb; + + gettimeofday(&tv, NULL); + + LOG(("schedule list at %ld:%ld", tv.tv_sec, tv.tv_usec)); + + cur_nscb = schedule_list; + + while (cur_nscb != NULL) { + LOG(("Schedule %p at %ld:%ld", + cur_nscb, cur_nscb->tv.tv_sec, cur_nscb->tv.tv_usec)); + cur_nscb = cur_nscb->next; + } +} + + +/* + * Local Variables: + * c-basic-offset:8 + * End: + */ |