| 1 |
/* |
| 2 |
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd) |
| 3 |
* |
| 4 |
* Copyright (c) 2000-2020 ircd-hybrid development team |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 |
| 19 |
* USA |
| 20 |
*/ |
| 21 |
|
| 22 |
/*! \file event.c |
| 23 |
* \brief Timer based event execution |
| 24 |
* \version $Id$ |
| 25 |
*/ |
| 26 |
|
| 27 |
#include "stdinc.h" |
| 28 |
#include "list.h" |
| 29 |
#include "ircd.h" |
| 30 |
#include "event.h" |
| 31 |
#include "rng_mt.h" |
| 32 |
#include "log.h" |
| 33 |
|
| 34 |
|
| 35 |
struct event_base ebase; |
| 36 |
struct event_base *event_base = &ebase; |
| 37 |
|
| 38 |
static dlink_list event_list; |
| 39 |
|
| 40 |
const dlink_list * |
| 41 |
event_get_list(void) |
| 42 |
{ |
| 43 |
return &event_list; |
| 44 |
} |
| 45 |
|
| 46 |
void |
| 47 |
event_add(struct event *ev, void *data) |
| 48 |
{ |
| 49 |
dlink_node *node; |
| 50 |
|
| 51 |
event_delete(ev); |
| 52 |
|
| 53 |
ev->data = data; |
| 54 |
ev->next = event_base->time.sec_monotonic + ev->when; |
| 55 |
ev->active = true; |
| 56 |
|
| 57 |
DLINK_FOREACH(node, event_list.head) |
| 58 |
{ |
| 59 |
struct event *e = node->data; |
| 60 |
|
| 61 |
if (e->next > ev->next) |
| 62 |
{ |
| 63 |
dlinkAddBefore(node, ev, &ev->node, &event_list); |
| 64 |
return; |
| 65 |
} |
| 66 |
} |
| 67 |
|
| 68 |
dlinkAddTail(ev, &ev->node, &event_list); |
| 69 |
} |
| 70 |
|
| 71 |
void |
| 72 |
event_addish(struct event *ev, void *data) |
| 73 |
{ |
| 74 |
if (ev->when >= 3) |
| 75 |
{ |
| 76 |
const uintmax_t two_third = (2 * ev->when) / 3; |
| 77 |
|
| 78 |
ev->when = two_third + ((genrand_int32() % 1000) * two_third) / 1000; |
| 79 |
} |
| 80 |
|
| 81 |
event_add(ev, data); |
| 82 |
} |
| 83 |
|
| 84 |
void |
| 85 |
event_delete(struct event *ev) |
| 86 |
{ |
| 87 |
if (ev->active == false) |
| 88 |
return; |
| 89 |
|
| 90 |
dlinkDelete(&ev->node, &event_list); |
| 91 |
ev->active = false; |
| 92 |
} |
| 93 |
|
| 94 |
void |
| 95 |
event_run(void) |
| 96 |
{ |
| 97 |
static uintmax_t last = 0; |
| 98 |
|
| 99 |
if (last == event_base->time.sec_monotonic) |
| 100 |
return; |
| 101 |
last = event_base->time.sec_monotonic; |
| 102 |
|
| 103 |
unsigned int len = dlink_list_length(&event_list); |
| 104 |
while (len-- && dlink_list_length(&event_list)) |
| 105 |
{ |
| 106 |
struct event *ev = event_list.head->data; |
| 107 |
|
| 108 |
if (ev->next > event_base->time.sec_monotonic) |
| 109 |
break; |
| 110 |
|
| 111 |
event_delete(ev); |
| 112 |
|
| 113 |
ev->handler(ev->data); |
| 114 |
|
| 115 |
if (ev->oneshot == false) |
| 116 |
event_add(ev, ev->data); |
| 117 |
} |
| 118 |
} |
| 119 |
|
| 120 |
void |
| 121 |
event_time_set(void) |
| 122 |
{ |
| 123 |
struct timespec newtime; |
| 124 |
|
| 125 |
if (clock_gettime(CLOCK_REALTIME, &newtime)) |
| 126 |
exit(EXIT_FAILURE); |
| 127 |
else if (event_base->time.sec_real > (uintmax_t)newtime.tv_sec) |
| 128 |
ilog(LOG_TYPE_IRCD, "System clock is running backwards - (%ju < %ju)", |
| 129 |
(uintmax_t)newtime.tv_sec, event_base->time.sec_real); |
| 130 |
event_base->time.sec_real = newtime.tv_sec; |
| 131 |
|
| 132 |
#ifdef CLOCK_MONOTONIC_RAW |
| 133 |
if (clock_gettime(CLOCK_MONOTONIC_RAW, &newtime) == 0) |
| 134 |
#else |
| 135 |
if (clock_gettime(CLOCK_MONOTONIC, &newtime) == 0) |
| 136 |
#endif |
| 137 |
event_base->time.sec_monotonic = newtime.tv_sec; |
| 138 |
else |
| 139 |
exit(EXIT_FAILURE); |
| 140 |
} |
