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/*
Copyright (c) 2007-2011 Gluster, Inc. <http://www.gluster.com>
This file is part of GlusterFS.
GlusterFS 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.
GlusterFS 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/>.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "timer.h"
#include "logging.h"
#include "common-utils.h"
#include "globals.h"
#define TS(tv) ((((unsigned long long) tv.tv_sec) * 1000000) + (tv.tv_usec))
gf_timer_t *
gf_timer_call_after (glusterfs_ctx_t *ctx,
struct timeval delta,
gf_timer_cbk_t callbk,
void *data)
{
gf_timer_registry_t *reg = NULL;
gf_timer_t *event = NULL;
gf_timer_t *trav = NULL;
unsigned long long at = 0L;
if (ctx == NULL)
{
gf_log_callingfn ("timer", GF_LOG_ERROR, "invalid argument");
return NULL;
}
reg = gf_timer_registry_init (ctx);
if (!reg) {
gf_log_callingfn ("timer", GF_LOG_ERROR, "!reg");
return NULL;
}
event = GF_CALLOC (1, sizeof (*event), gf_common_mt_gf_timer_t);
if (!event) {
return NULL;
}
gettimeofday (&event->at, NULL);
event->at.tv_usec = ((event->at.tv_usec + delta.tv_usec) % 1000000);
event->at.tv_sec += ((event->at.tv_usec + delta.tv_usec) / 1000000);
event->at.tv_sec += delta.tv_sec;
at = TS (event->at);
event->callbk = callbk;
event->data = data;
event->xl = THIS;
pthread_mutex_lock (®->lock);
{
trav = reg->active.prev;
while (trav != ®->active) {
if (TS (trav->at) < at)
break;
trav = trav->prev;
}
event->prev = trav;
event->next = event->prev->next;
event->prev->next = event;
event->next->prev = event;
}
pthread_mutex_unlock (®->lock);
return event;
}
int32_t
gf_timer_call_stale (gf_timer_registry_t *reg,
gf_timer_t *event)
{
if (reg == NULL || event == NULL)
{
gf_log_callingfn ("timer", GF_LOG_ERROR, "invalid argument");
return 0;
}
event->next->prev = event->prev;
event->prev->next = event->next;
event->next = ®->stale;
event->prev = event->next->prev;
event->next->prev = event;
event->prev->next = event;
return 0;
}
int32_t
gf_timer_call_cancel (glusterfs_ctx_t *ctx,
gf_timer_t *event)
{
gf_timer_registry_t *reg = NULL;
if (ctx == NULL || event == NULL)
{
gf_log_callingfn ("timer", GF_LOG_ERROR, "invalid argument");
return 0;
}
reg = gf_timer_registry_init (ctx);
if (!reg) {
gf_log ("timer", GF_LOG_ERROR, "!reg");
GF_FREE (event);
return 0;
}
pthread_mutex_lock (®->lock);
{
event->next->prev = event->prev;
event->prev->next = event->next;
}
pthread_mutex_unlock (®->lock);
GF_FREE (event);
return 0;
}
void *
gf_timer_proc (void *ctx)
{
gf_timer_registry_t *reg = NULL;
if (ctx == NULL)
{
gf_log_callingfn ("timer", GF_LOG_ERROR, "invalid argument");
return NULL;
}
reg = gf_timer_registry_init (ctx);
if (!reg) {
gf_log ("timer", GF_LOG_ERROR, "!reg");
return NULL;
}
while (!reg->fin) {
unsigned long long now;
struct timeval now_tv;
gf_timer_t *event = NULL;
gettimeofday (&now_tv, NULL);
now = TS (now_tv);
while (1) {
unsigned long long at;
char need_cbk = 0;
pthread_mutex_lock (®->lock);
{
event = reg->active.next;
at = TS (event->at);
if (event != ®->active && now >= at) {
need_cbk = 1;
gf_timer_call_stale (reg, event);
}
}
pthread_mutex_unlock (®->lock);
if (event->xl)
THIS = event->xl;
if (need_cbk)
event->callbk (event->data);
else
break;
}
usleep (1000000);
}
pthread_mutex_lock (®->lock);
{
while (reg->active.next != ®->active) {
gf_timer_call_cancel (ctx, reg->active.next);
}
while (reg->stale.next != ®->stale) {
gf_timer_call_cancel (ctx, reg->stale.next);
}
}
pthread_mutex_unlock (®->lock);
pthread_mutex_destroy (®->lock);
GF_FREE (((glusterfs_ctx_t *)ctx)->timer);
return NULL;
}
gf_timer_registry_t *
gf_timer_registry_init (glusterfs_ctx_t *ctx)
{
if (ctx == NULL) {
gf_log_callingfn ("timer", GF_LOG_ERROR, "invalid argument");
return NULL;
}
if (!ctx->timer) {
gf_timer_registry_t *reg = NULL;
reg = GF_CALLOC (1, sizeof (*reg),
gf_common_mt_gf_timer_registry_t);
if (!reg)
goto out;
pthread_mutex_init (®->lock, NULL);
reg->active.next = ®->active;
reg->active.prev = ®->active;
reg->stale.next = ®->stale;
reg->stale.prev = ®->stale;
ctx->timer = reg;
pthread_create (®->th, NULL, gf_timer_proc, ctx);
}
out:
return ctx->timer;
}
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