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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 Mono.Tasklets;
using OpenSim.Framework.Monitoring;
using System;
using System.Collections.Generic;
using System.Threading;
namespace OpenSim.Region.ScriptEngine.XMREngine
{
/**
* @brief 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.
*/
public class XMRScriptThread
{
private static int m_WakeUpOne = 0;
public static object m_WakeUpLock = new object();
private static Dictionary<Thread,XMRScriptThread> m_AllThreads = new Dictionary<Thread,XMRScriptThread> ();
/**
* @brief Something was just added to the Start or Yield queue so
* wake one of the XMRScriptThread instances to run it.
*/
public static void WakeUpOne()
{
lock (m_WakeUpLock)
{
m_WakeUpOne ++;
Monitor.Pulse (m_WakeUpLock);
}
}
public static XMRScriptThread CurrentScriptThread ()
{
XMRScriptThread st;
lock (m_AllThreads) {
m_AllThreads.TryGetValue (Thread.CurrentThread, out st);
}
return st;
}
private bool m_Exiting = false;
private bool m_SuspendScriptThreadFlag = false;
private bool m_WakeUpThis = false;
private bool m_Continuations = false;
public DateTime m_LastRanAt = DateTime.MinValue;
public int m_ScriptThreadTID = 0;
public long m_ScriptExecTime = 0;
private Thread thd;
private XMREngine engine;
public XMRInstance m_RunInstance = null;
public XMRScriptThread(XMREngine eng)
{
engine = eng;
m_Continuations = engine.uThreadCtor.DeclaringType == typeof (ScriptUThread_Con);
// thd = XMREngine.StartMyThread (RunScriptThread, "xmrengine script", ThreadPriority.BelowNormal);
thd = XMREngine.StartMyThread (RunScriptThread, "xmrengine script", ThreadPriority.Normal);
lock (m_AllThreads)
m_AllThreads.Add (thd, this);
}
public void SuspendThread()
{
m_SuspendScriptThreadFlag = true;
WakeUpScriptThread();
}
public void ResumeThread()
{
m_SuspendScriptThreadFlag = false;
WakeUpScriptThread();
}
public void Terminate()
{
m_Exiting = true;
WakeUpScriptThread();
thd.Join();
lock (m_AllThreads)
m_AllThreads.Remove (thd);
thd = null;
}
public void TimeSlice()
{
XMRInstance instance = m_RunInstance;
if (instance != null)
instance.suspendOnCheckRunTemp = true;
}
/**
* @brief Wake up this XMRScriptThread instance.
*/
private void WakeUpScriptThread()
{
lock (m_WakeUpLock) {
m_WakeUpThis = true;
Monitor.PulseAll (m_WakeUpLock);
}
}
/**
* @brief Thread that runs the scripts.
*/
private void RunScriptThread()
{
XMRInstance inst;
Mono.Tasklets.Continuation engstack = null;
if (m_Continuations) {
engstack = new Mono.Tasklets.Continuation ();
engstack.Mark ();
}
m_ScriptThreadTID = System.Threading.Thread.CurrentThread.ManagedThreadId;
while (!m_Exiting) {
XMREngine.UpdateMyThread ();
/*
* Handle 'xmr resume/suspend' commands.
*/
if (m_SuspendScriptThreadFlag) {
lock (m_WakeUpLock) {
while (m_SuspendScriptThreadFlag &&
!m_Exiting &&
(engine.m_ThunkQueue.Count == 0)) {
Monitor.Wait (m_WakeUpLock, Watchdog.DEFAULT_WATCHDOG_TIMEOUT_MS / 2);
XMREngine.UpdateMyThread ();
}
}
}
/*
* Maybe there are some scripts waiting to be migrated in or out.
*/
ThreadStart thunk = null;
lock (m_WakeUpLock) {
if (engine.m_ThunkQueue.Count > 0) {
thunk = engine.m_ThunkQueue.Dequeue ();
}
}
if (thunk != null) {
inst = (XMRInstance)thunk.Target;
if (m_Continuations && (inst.scrstack == null)) {
inst.engstack = engstack;
inst.scrstack = new Mono.Tasklets.Continuation ();
inst.scrstack.Mark ();
}
thunk ();
continue;
}
if (engine.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;
for (numStarts = 5; -- numStarts >= 0;) {
lock (engine.m_StartQueue) {
inst = engine.m_StartQueue.RemoveHead();
}
if (inst == null) break;
if (inst.m_IState != XMRInstState.ONSTARTQ) throw new Exception("bad state");
if (m_Continuations && (inst.scrstack == null)) {
inst.engstack = engstack;
inst.scrstack = new Mono.Tasklets.Continuation ();
inst.scrstack.Mark ();
}
RunInstance (inst);
}
/*
* 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 (engine.m_YieldQueue) {
inst = engine.m_YieldQueue.RemoveHead();
}
if (inst != null) {
if (inst.m_IState != XMRInstState.ONYIELDQ) throw new Exception("bad state");
RunInstance (inst);
numStarts = -1;
}
/*
* If we left something dangling in the m_StartQueue or m_YieldQueue, go back to check it.
*/
if (numStarts < 0) 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);
}
}
}
XMREngine.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)
{
m_LastRanAt = DateTime.UtcNow;
m_ScriptExecTime -= (long)(m_LastRanAt - DateTime.MinValue).TotalMilliseconds;
inst.m_IState = XMRInstState.RUNNING;
m_RunInstance = inst;
XMRInstState newIState = inst.RunOne();
m_RunInstance = null;
engine.HandleNewIState(inst, newIState);
m_ScriptExecTime += (long)(DateTime.UtcNow - DateTime.MinValue).TotalMilliseconds;
}
}
}
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