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244 lines
6.0 KiB
C
244 lines
6.0 KiB
C
/*
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Unix SMB/CIFS implementation.
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common events code for timed events
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Copyright (C) Andrew Tridgell 2003-2006
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Copyright (C) Stefan Metzmacher 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "system/time.h"
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#include "tevent.h"
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#include "tevent_internal.h"
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#include "tevent_util.h"
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/**
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compare two timeval structures.
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Return -1 if tv1 < tv2
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Return 0 if tv1 == tv2
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Return 1 if tv1 > tv2
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*/
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static int ev_timeval_compare(const struct timeval *tv1, const struct timeval *tv2)
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{
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if (tv1->tv_sec > tv2->tv_sec) return 1;
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if (tv1->tv_sec < tv2->tv_sec) return -1;
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if (tv1->tv_usec > tv2->tv_usec) return 1;
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if (tv1->tv_usec < tv2->tv_usec) return -1;
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return 0;
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}
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/**
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return a zero timeval
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*/
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static struct timeval ev_timeval_zero(void)
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{
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struct timeval tv;
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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return tv;
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}
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/**
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return a timeval for the current time
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*/
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static struct timeval ev_timeval_current(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv;
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}
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/**
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return a timeval struct with the given elements
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*/
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static struct timeval ev_timeval_set(uint32_t secs, uint32_t usecs)
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{
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struct timeval tv;
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tv.tv_sec = secs;
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tv.tv_usec = usecs;
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return tv;
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}
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/**
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return the difference between two timevals as a timeval
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if tv1 comes after tv2, then return a zero timeval
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(this is *tv2 - *tv1)
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*/
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static struct timeval ev_timeval_until(const struct timeval *tv1,
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const struct timeval *tv2)
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{
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struct timeval t;
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if (ev_timeval_compare(tv1, tv2) >= 0) {
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return ev_timeval_zero();
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}
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t.tv_sec = tv2->tv_sec - tv1->tv_sec;
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if (tv1->tv_usec > tv2->tv_usec) {
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t.tv_sec--;
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t.tv_usec = 1000000 - (tv1->tv_usec - tv2->tv_usec);
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} else {
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t.tv_usec = tv2->tv_usec - tv1->tv_usec;
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}
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return t;
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}
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/**
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return true if a timeval is zero
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*/
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bool ev_timeval_is_zero(const struct timeval *tv)
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{
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return tv->tv_sec == 0 && tv->tv_usec == 0;
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}
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/*
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destroy a timed event
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*/
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static int tevent_common_timed_destructor(struct tevent_timer *te)
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{
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tevent_debug(te->event_ctx, TEVENT_DEBUG_TRACE,
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"Destroying timer event %p \"%s\"\n",
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te, te->handler_name);
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if (te->event_ctx) {
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DLIST_REMOVE(te->event_ctx->timer_events, te);
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}
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return 0;
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}
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static int tevent_common_timed_deny_destructor(struct tevent_timer *te)
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{
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return -1;
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}
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/*
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add a timed event
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return NULL on failure (memory allocation error)
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*/
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struct tevent_timer *tevent_common_add_timer(struct tevent_context *ev, TALLOC_CTX *mem_ctx,
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struct timeval next_event,
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tevent_timer_handler_t handler,
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void *private_data,
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const char *handler_name,
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const char *location)
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{
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struct tevent_timer *te, *last_te, *cur_te;
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te = talloc(mem_ctx?mem_ctx:ev, struct tevent_timer);
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if (te == NULL) return NULL;
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te->event_ctx = ev;
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te->next_event = next_event;
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te->handler = handler;
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te->private_data = private_data;
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te->handler_name = handler_name;
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te->location = location;
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te->additional_data = NULL;
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/* keep the list ordered */
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last_te = NULL;
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for (cur_te = ev->timer_events; cur_te; cur_te = cur_te->next) {
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/* if the new event comes before the current one break */
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if (ev_timeval_compare(&te->next_event, &cur_te->next_event) < 0) {
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break;
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}
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last_te = cur_te;
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}
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DLIST_ADD_AFTER(ev->timer_events, te, last_te);
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talloc_set_destructor(te, tevent_common_timed_destructor);
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tevent_debug(ev, TEVENT_DEBUG_TRACE,
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"Added timed event \"%s\": %p\n",
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handler_name, te);
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return te;
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}
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/*
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do a single event loop using the events defined in ev
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return the delay untill the next timed event,
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or zero if a timed event was triggered
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*/
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struct timeval tevent_common_loop_timer_delay(struct tevent_context *ev)
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{
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struct timeval current_time = ev_timeval_zero();
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struct tevent_timer *te = ev->timer_events;
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if (!te) {
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/* have a default tick time of 30 seconds. This guarantees
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that code that uses its own timeout checking will be
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able to proceeed eventually */
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return ev_timeval_set(30, 0);
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}
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/*
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* work out the right timeout for the next timed event
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*
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* avoid the syscall to gettimeofday() if the timed event should
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* be triggered directly
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*
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* if there's a delay till the next timed event, we're done
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* with just returning the delay
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*/
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if (!ev_timeval_is_zero(&te->next_event)) {
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struct timeval delay;
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current_time = ev_timeval_current();
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delay = ev_timeval_until(¤t_time, &te->next_event);
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if (!ev_timeval_is_zero(&delay)) {
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return delay;
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}
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}
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/*
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* ok, we have a timed event that we'll process ...
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*/
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/* deny the handler to free the event */
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talloc_set_destructor(te, tevent_common_timed_deny_destructor);
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/* We need to remove the timer from the list before calling the
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* handler because in a semi-async inner event loop called from the
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* handler we don't want to come across this event again -- vl */
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DLIST_REMOVE(ev->timer_events, te);
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/*
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* If the timed event was registered for a zero current_time,
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* then we pass a zero timeval here too! To avoid the
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* overhead of gettimeofday() calls.
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*
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* otherwise we pass the current time
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*/
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te->handler(ev, te, current_time, te->private_data);
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/* The destructor isn't necessary anymore, we've already removed the
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* event from the list. */
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talloc_set_destructor(te, NULL);
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tevent_debug(te->event_ctx, TEVENT_DEBUG_TRACE,
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"Ending timer event %p \"%s\"\n",
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te, te->handler_name);
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talloc_free(te);
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return ev_timeval_zero();
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}
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