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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* 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 OpenSimulator Project 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 DEVELOPERS ``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 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.
*/
using OpenSim.Framework.Monitoring;
using System;
using System.Collections.Generic;
using System.Threading;
namespace OpenSim.Region.ScriptEngine.Yengine
{
public partial class Yengine
{
private int m_WakeUpOne = 0;
public object m_WakeUpLock = new object();
private Dictionary<int, XMRInstance> m_RunningInstances = new Dictionary<int, XMRInstance>();
private bool m_SuspendScriptThreadFlag = false;
private bool m_WakeUpThis = false;
public DateTime m_LastRanAt = DateTime.MinValue;
public long m_ScriptExecTime = 0;
[ThreadStatic]
private static int m_ScriptThreadTID;
public static bool IsScriptThread
{
get
{
return m_ScriptThreadTID != 0;
}
}
public void StartThreadWorker(int i)
{
Thread thd;
if(i >= 0)
thd = Yengine.StartMyThread(RunScriptThread, "YScript" + i.ToString(), ThreadPriority.BelowNormal);
else
thd = Yengine.StartMyThread(RunScriptThread, "YScript", ThreadPriority.BelowNormal);
lock(m_WakeUpLock)
m_RunningInstances.Add(thd.ManagedThreadId, null);
}
public void StopThreadWorkers()
{
lock(m_WakeUpLock)
{
while(m_RunningInstances.Count != 0)
{
Monitor.PulseAll(m_WakeUpLock);
Monitor.Wait(m_WakeUpLock, Watchdog.DEFAULT_WATCHDOG_TIMEOUT_MS / 2);
}
}
}
/**
* @brief Something was just added to the Start or Yield queue so
* wake one of the RunScriptThread() instances to run it.
*/
public void WakeUpOne()
{
lock(m_WakeUpLock)
{
m_WakeUpOne++;
Monitor.Pulse(m_WakeUpLock);
}
}
public void SuspendThreads()
{
lock(m_WakeUpLock)
{
m_SuspendScriptThreadFlag = true;
Monitor.PulseAll(m_WakeUpLock);
}
}
public void ResumeThreads()
{
lock(m_WakeUpLock)
{
m_SuspendScriptThreadFlag = false;
Monitor.PulseAll(m_WakeUpLock);
}
}
/**
* @brief Thread that runs the scripts.
*
* There are NUMSCRIPTHREADWKRS of these.
* Each sits in a loop checking the Start and Yield queues for
* a script to run and calls the script as a microthread.
*/
private void RunScriptThread()
{
int tid = System.Threading.Thread.CurrentThread.ManagedThreadId;
ThreadStart thunk;
XMRInstance inst;
bool didevent;
m_ScriptThreadTID = tid;
while(!m_Exiting)
{
Yengine.UpdateMyThread();
lock(m_WakeUpLock)
{
// Maybe there are some scripts waiting to be migrated in or out.
thunk = null;
if(m_ThunkQueue.Count > 0)
thunk = m_ThunkQueue.Dequeue();
// Handle 'xmr resume/suspend' commands.
else if(m_SuspendScriptThreadFlag && !m_Exiting)
{
Monitor.Wait(m_WakeUpLock, Watchdog.DEFAULT_WATCHDOG_TIMEOUT_MS / 2);
Yengine.UpdateMyThread();
continue;
}
}
if(thunk != null)
{
thunk();
continue;
}
if(m_StartProcessing)
{
// If event just queued to any idle scripts
// start them right away. But only start so
// many so we can make some progress on yield
// queue.
int numStarts;
didevent = false;
for(numStarts = 5; numStarts >= 0; --numStarts)
{
lock(m_StartQueue)
inst = m_StartQueue.RemoveHead();
if(inst == null)
break;
if (inst.m_IState == XMRInstState.SUSPENDED)
continue;
if (inst.m_IState != XMRInstState.ONSTARTQ)
throw new Exception("bad state");
RunInstance(inst, tid);
if(m_SuspendScriptThreadFlag || m_Exiting)
continue;
didevent = true;
}
// If there is something to run, run it
// then rescan from the beginning in case
// a lot of things have changed meanwhile.
//
// These are considered lower priority than
// m_StartQueue as they have been taking at
// least one quantum of CPU time and event
// handlers are supposed to be quick.
lock(m_YieldQueue)
inst = m_YieldQueue.RemoveHead();
if(inst != null)
{
if (inst.m_IState == XMRInstState.SUSPENDED)
continue;
if (inst.m_IState != XMRInstState.ONYIELDQ)
throw new Exception("bad state");
RunInstance(inst, tid);
continue;
}
// If we left something dangling in the m_StartQueue or m_YieldQueue, go back to check it.
if(didevent)
continue;
}
// Nothing to do, sleep.
lock(m_WakeUpLock)
{
if(!m_WakeUpThis && (m_WakeUpOne <= 0) && !m_Exiting)
Monitor.Wait(m_WakeUpLock, Watchdog.DEFAULT_WATCHDOG_TIMEOUT_MS / 2);
m_WakeUpThis = false;
if((m_WakeUpOne > 0) && (--m_WakeUpOne > 0))
Monitor.Pulse(m_WakeUpLock);
}
}
lock(m_WakeUpLock)
m_RunningInstances.Remove(tid);
Yengine.MyThreadExiting();
}
/**
* @brief A script instance was just removed from the Start or Yield Queue.
* So run it for a little bit then stick in whatever queue it should go in.
*/
private void RunInstance(XMRInstance inst, int tid)
{
m_LastRanAt = DateTime.UtcNow;
m_ScriptExecTime -= (long)(m_LastRanAt - DateTime.MinValue).TotalMilliseconds;
inst.m_IState = XMRInstState.RUNNING;
lock(m_WakeUpLock)
m_RunningInstances[tid] = inst;
XMRInstState newIState = inst.RunOne();
lock(m_WakeUpLock)
m_RunningInstances[tid] = null;
HandleNewIState(inst, newIState);
m_ScriptExecTime += (long)(DateTime.UtcNow - DateTime.MinValue).TotalMilliseconds;
}
}
}
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