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/* Copyright (C) 2003 MySQL AB
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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <ndb_global.h>
#include <my_pthread.h>
#include <sys/times.h>
#include "WatchDog.hpp"
#include "GlobalData.hpp"
#include <NdbOut.hpp>
#include <NdbSleep.h>
#include <ErrorHandlingMacros.hpp>
#include <EventLogger.hpp>
#include <NdbTick.h>
extern EventLogger g_eventLogger;
extern "C"
void*
runWatchDog(void* w){
((WatchDog*)w)->run();
return NULL;
}
WatchDog::WatchDog(Uint32 interval) :
theIPValue(globalData.getWatchDogPtr())
{
setCheckInterval(interval);
theStop = false;
theThreadPtr = 0;
}
WatchDog::~WatchDog(){
doStop();
}
Uint32
WatchDog::setCheckInterval(Uint32 interval){
// An interval of less than 70ms is not acceptable
return theInterval = (interval < 70 ? 70 : interval);
}
void
WatchDog::doStart(){
theStop = false;
theThreadPtr = NdbThread_Create(runWatchDog,
(void**)this,
32768,
"ndb_watchdog",
NDB_THREAD_PRIO_HIGH);
}
void
WatchDog::doStop(){
void *status;
theStop = true;
if(theThreadPtr){
NdbThread_WaitFor(theThreadPtr, &status);
NdbThread_Destroy(&theThreadPtr);
}
}
const char *get_action(Uint32 IPValue)
{
const char *action;
switch (IPValue) {
case 1:
action = "Job Handling";
break;
case 2:
action = "Scanning Timers";
break;
case 3:
action = "External I/O";
break;
case 4:
action = "Print Job Buffers at crash";
break;
case 5:
action = "Checking connections";
break;
case 6:
action = "Performing Send";
break;
case 7:
action = "Polling for Receive";
break;
case 8:
action = "Performing Receive";
break;
case 9:
action = "Allocating memory";
break;
default:
action = "Unknown place";
break;
}//switch
return action;
}
void
WatchDog::run()
{
unsigned int anIPValue, sleep_time;
unsigned int oldIPValue = 0;
unsigned int theIntervalCheck = theInterval;
struct MicroSecondTimer start_time, last_time, now;
NdbTick_getMicroTimer(&start_time);
last_time = start_time;
// WatchDog for the single threaded NDB
while (!theStop)
{
sleep_time= 100;
NdbSleep_MilliSleep(sleep_time);
if(theStop)
break;
NdbTick_getMicroTimer(&now);
if (NdbTick_getMicrosPassed(last_time, now)/1000 > sleep_time*2)
{
struct tms my_tms;
times(&my_tms);
g_eventLogger.info("Watchdog: User time: %llu System time: %llu",
(Uint64)my_tms.tms_utime,
(Uint64)my_tms.tms_stime);
g_eventLogger.warning("Watchdog: Warning overslept %u ms, expected %u ms.",
NdbTick_getMicrosPassed(last_time, now)/1000,
sleep_time);
}
last_time = now;
// Verify that the IP thread is not stuck in a loop
anIPValue = *theIPValue;
if (anIPValue != 0)
{
oldIPValue = anIPValue;
globalData.incrementWatchDogCounter(0);
NdbTick_getMicroTimer(&start_time);
theIntervalCheck = theInterval;
}
else
{
int warn = 1;
Uint32 elapsed = NdbTick_getMicrosPassed(start_time, now)/1000;
/*
oldIPValue == 9 indicates malloc going on, this can take some time
so only warn if we pass the watchdog interval
*/
if (oldIPValue == 9)
if (elapsed < theIntervalCheck)
warn = 0;
else
theIntervalCheck += theInterval;
if (warn)
{
const char *last_stuck_action = get_action(oldIPValue);
g_eventLogger.warning("Ndb kernel is stuck in: %s", last_stuck_action);
{
struct tms my_tms;
times(&my_tms);
g_eventLogger.info("Watchdog: User time: %llu System time: %llu",
(Uint64)my_tms.tms_utime,
(Uint64)my_tms.tms_stime);
}
if (elapsed > 3 * theInterval)
{
shutdownSystem(last_stuck_action);
}
}
}
}
return;
}
void
WatchDog::shutdownSystem(const char *last_stuck_action){
ErrorReporter::handleError(NDBD_EXIT_WATCHDOG_TERMINATE,
last_stuck_action,
__FILE__,
NST_Watchdog);
}
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