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/*
* Copyright (c) 2002-2006 MontaVista Software, Inc.
* Copyright (c) 2006-2009 Red Hat, Inc.
*
* All rights reserved.
*
* Author: Steven Dake (sdake@redhat.com)
*
* This software licensed under BSD license, the text of which follows:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the MontaVista Software, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#include <pthread.h>
#include <assert.h>
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <sys/poll.h>
#include <sys/uio.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#include <sched.h>
#include <time.h>
#include <corosync/swab.h>
#include <corosync/corotypes.h>
#include <corosync/list.h>
#include <corosync/queue.h>
#include <corosync/lcr/lcr_ifact.h>
#include <corosync/totem/coropoll.h>
#include <corosync/totem/totempg.h>
#include <corosync/engine/objdb.h>
#include <corosync/engine/config.h>
#define LOG_SERVICE LOG_SERVICE_IPC
#include <corosync/engine/logsys.h>
#include "poll.h"
#include "totemsrp.h"
#include "mempool.h"
#include "mainconfig.h"
#include "totemconfig.h"
#include "main.h"
#include "sync.h"
#include "tlist.h"
#include "util.h"
#include "timer.h"
#define SERVER_BACKLOG 5
static pthread_mutex_t timer_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_t expiry_thread;
static pthread_attr_t thread_attr;
static struct timerlist timers_timerlist;
static int sched_priority = 0;
static void (*timer_serialize_lock_fn) (void);
static void (*timer_serialize_unlock_fn) (void);
static void *prioritized_timer_thread (void *data);
extern void pthread_exit(void *) __attribute__((noreturn));
/*
* This thread runs at the highest priority to run system wide timers
*/
static void *prioritized_timer_thread (void *data)
{
int fds;
unsigned long long timeout;
#if ! defined(TS_CLASS) && (defined(COROSYNC_BSD) || defined(COROSYNC_LINUX) || defined(COROSYNC_SOLARIS))
if (sched_priority != 0) {
struct sched_param sched_param;
sched_param.sched_priority = sched_priority;
pthread_setschedparam (expiry_thread, SCHED_RR, &sched_param);
}
#endif
pthread_mutex_unlock (&timer_mutex);
for (;;) {
timer_serialize_lock_fn ();
timeout = timerlist_msec_duration_to_expire (&timers_timerlist);
if (timeout != -1 && timeout > 0xFFFFFFFF) {
timeout = 0xFFFFFFFE;
}
timer_serialize_unlock_fn ();
fds = poll (NULL, 0, timeout);
if (fds == 0 || (fds < 0 && errno == EINTR)) {
continue;
}
if (fds < 0) {
return NULL;
}
pthread_mutex_lock (&timer_mutex);
timer_serialize_lock_fn ();
timerlist_expire (&timers_timerlist);
timer_serialize_unlock_fn ();
pthread_mutex_unlock (&timer_mutex);
}
}
static void sigusr1_handler (int num) {
#ifdef COROSYNC_SOLARIS
/* Rearm the signal facility */
signal (num, sigusr1_handler);
#endif
}
int corosync_timer_init (
void (*serialize_lock_fn) (void),
void (*serialize_unlock_fn) (void),
int sched_priority_in)
{
int res;
timer_serialize_lock_fn = serialize_lock_fn;
timer_serialize_unlock_fn = serialize_unlock_fn;
sched_priority = sched_priority_in;
timerlist_init (&timers_timerlist);
signal (SIGUSR1, sigusr1_handler);
pthread_mutex_lock (&timer_mutex);
pthread_attr_init (&thread_attr);
pthread_attr_setstacksize (&thread_attr, 100000);
pthread_attr_setdetachstate (&thread_attr, PTHREAD_CREATE_DETACHED);
res = pthread_create (&expiry_thread, &thread_attr,
prioritized_timer_thread, NULL);
return (res);
}
int corosync_timer_add_absolute (
unsigned long long nanosec_from_epoch,
void *data,
void (*timer_fn) (void *data),
timer_handle *handle)
{
int res;
int unlock;
if (pthread_equal (pthread_self(), expiry_thread) != 0) {
unlock = 0;
} else {
unlock = 1;
pthread_mutex_lock (&timer_mutex);
}
res = timerlist_add_absolute (
&timers_timerlist,
timer_fn,
data,
nanosec_from_epoch,
handle);
if (unlock) {
pthread_mutex_unlock (&timer_mutex);
}
pthread_kill (expiry_thread, SIGUSR1);
return (res);
}
int corosync_timer_add_duration (
unsigned long long nanosec_duration,
void *data,
void (*timer_fn) (void *data),
timer_handle *handle)
{
int res;
int unlock;
if (pthread_equal (pthread_self(), expiry_thread) != 0) {
unlock = 0;
} else {
unlock = 1;
pthread_mutex_lock (&timer_mutex);
}
res = timerlist_add_duration (
&timers_timerlist,
timer_fn,
data,
nanosec_duration,
handle);
if (unlock) {
pthread_mutex_unlock (&timer_mutex);
}
pthread_kill (expiry_thread, SIGUSR1);
return (res);
}
void corosync_timer_delete (
timer_handle timer_handle)
{
int unlock;
if (timer_handle == 0) {
return;
}
if (pthread_equal (pthread_self(), expiry_thread) != 0) {
unlock = 0;
} else {
unlock = 1;
pthread_mutex_lock (&timer_mutex);
}
timerlist_del (&timers_timerlist, timer_handle);
if (unlock) {
pthread_mutex_unlock (&timer_mutex);
}
}
void corosync_timer_lock (void)
{
pthread_mutex_lock (&timer_mutex);
}
void corosync_timer_unlock (void)
{
pthread_mutex_unlock (&timer_mutex);
}
unsigned long long corosync_timer_time_get (void)
{
return (timerlist_nano_from_epoch());
}
unsigned long long corosync_timer_expire_time_get (
timer_handle timer_handle)
{
int unlock;
unsigned long long expire;
if (timer_handle == 0) {
return (0);
}
if (pthread_equal (pthread_self(), expiry_thread) != 0) {
unlock = 0;
} else {
unlock = 1;
pthread_mutex_lock (&timer_mutex);
}
expire = timerlist_expire_time (&timers_timerlist, timer_handle);
if (unlock) {
pthread_mutex_unlock (&timer_mutex);
}
return (expire);
}

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