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Diffstat (limited to 'tevent/tevent_timed.c')
| -rw-r--r-- | tevent/tevent_timed.c | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/tevent/tevent_timed.c b/tevent/tevent_timed.c deleted file mode 100644 index ba8213710..000000000 --- a/tevent/tevent_timed.c +++ /dev/null @@ -1,230 +0,0 @@ -/* - Unix SMB/CIFS implementation. - - common events code for timed events - - Copyright (C) Andrew Tridgell 2003-2006 - Copyright (C) Stefan Metzmacher 2005 - - 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. -*/ - -#include <sys/time.h> -#include <time.h> -#include "replace.h" -#include "system/filesys.h" -#include "system/select.h" -#include "tevent.h" -#include "tevent_internal.h" -#include "tevent_util.h" - -/** - compare two timeval structures. - Return -1 if tv1 < tv2 - Return 0 if tv1 == tv2 - Return 1 if tv1 > tv2 -*/ -static int ev_timeval_compare(const struct timeval *tv1, const struct timeval *tv2) -{ - if (tv1->tv_sec > tv2->tv_sec) return 1; - if (tv1->tv_sec < tv2->tv_sec) return -1; - if (tv1->tv_usec > tv2->tv_usec) return 1; - if (tv1->tv_usec < tv2->tv_usec) return -1; - return 0; -} - -/** - return a zero timeval -*/ -static struct timeval ev_timeval_zero(void) -{ - struct timeval tv; - tv.tv_sec = 0; - tv.tv_usec = 0; - return tv; -} - -/** - return a timeval for the current time -*/ -static struct timeval ev_timeval_current(void) -{ - struct timeval tv; - gettimeofday(&tv, NULL); - return tv; -} - -/** - return a timeval struct with the given elements -*/ -static struct timeval ev_timeval_set(uint32_t secs, uint32_t usecs) -{ - struct timeval tv; - tv.tv_sec = secs; - tv.tv_usec = usecs; - return tv; -} - -/** - return the difference between two timevals as a timeval - if tv1 comes after tv2, then return a zero timeval - (this is *tv2 - *tv1) -*/ -static struct timeval ev_timeval_until(const struct timeval *tv1, - const struct timeval *tv2) -{ - struct timeval t; - if (ev_timeval_compare(tv1, tv2) >= 0) { - return ev_timeval_zero(); - } - t.tv_sec = tv2->tv_sec - tv1->tv_sec; - if (tv1->tv_usec > tv2->tv_usec) { - t.tv_sec--; - t.tv_usec = 1000000 - (tv1->tv_usec - tv2->tv_usec); - } else { - t.tv_usec = tv2->tv_usec - tv1->tv_usec; - } - return t; -} - -/** - return true if a timeval is zero -*/ -bool ev_timeval_is_zero(const struct timeval *tv) -{ - return tv->tv_sec == 0 && tv->tv_usec == 0; -} - -/* - destroy a timed event -*/ -static int common_event_timed_destructor(struct timed_event *te) -{ - struct event_context *ev = talloc_get_type(te->event_ctx, - struct event_context); - DLIST_REMOVE(ev->timed_events, te); - return 0; -} - -static int common_event_timed_deny_destructor(struct timed_event *te) -{ - return -1; -} - -/* - add a timed event - return NULL on failure (memory allocation error) -*/ -struct timed_event *common_event_add_timed(struct event_context *ev, TALLOC_CTX *mem_ctx, - struct timeval next_event, - event_timed_handler_t handler, - void *private_data) -{ - struct timed_event *te, *last_te, *cur_te; - - te = talloc(mem_ctx?mem_ctx:ev, struct timed_event); - if (te == NULL) return NULL; - - te->event_ctx = ev; - te->next_event = next_event; - te->handler = handler; - te->private_data = private_data; - te->additional_data = NULL; - - /* keep the list ordered */ - last_te = NULL; - for (cur_te = ev->timed_events; cur_te; cur_te = cur_te->next) { - /* if the new event comes before the current one break */ - if (ev_timeval_compare(&te->next_event, &cur_te->next_event) < 0) { - break; - } - - last_te = cur_te; - } - - DLIST_ADD_AFTER(ev->timed_events, te, last_te); - - talloc_set_destructor(te, common_event_timed_destructor); - - return te; -} - -/* - do a single event loop using the events defined in ev - - return the delay untill the next timed event, - or zero if a timed event was triggered -*/ -struct timeval common_event_loop_timer_delay(struct event_context *ev) -{ - struct timeval current_time = ev_timeval_zero(); - struct timed_event *te = ev->timed_events; - - if (!te) { - /* have a default tick time of 30 seconds. This guarantees - that code that uses its own timeout checking will be - able to proceeed eventually */ - return ev_timeval_set(30, 0); - } - - /* - * work out the right timeout for the next timed event - * - * avoid the syscall to gettimeofday() if the timed event should - * be triggered directly - * - * if there's a delay till the next timed event, we're done - * with just returning the delay - */ - if (!ev_timeval_is_zero(&te->next_event)) { - struct timeval delay; - - current_time = ev_timeval_current(); - - delay = ev_timeval_until(¤t_time, &te->next_event); - if (!ev_timeval_is_zero(&delay)) { - return delay; - } - } - - /* - * ok, we have a timed event that we'll process ... - */ - - /* deny the handler to free the event */ - talloc_set_destructor(te, common_event_timed_deny_destructor); - - /* We need to remove the timer from the list before calling the - * handler because in a semi-async inner event loop called from the - * handler we don't want to come across this event again -- vl */ - DLIST_REMOVE(ev->timed_events, te); - - /* - * If the timed event was registered for a zero current_time, - * then we pass a zero timeval here too! To avoid the - * overhead of gettimeofday() calls. - * - * otherwise we pass the current time - */ - te->handler(ev, te, current_time, te->private_data); - - /* The destructor isn't necessary anymore, we've already removed the - * event from the list. */ - talloc_set_destructor(te, NULL); - - talloc_free(te); - - return ev_timeval_zero(); -} - |