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Worker.cs
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Worker.cs
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// Copyright (C) by Housemarque, Inc.
namespace Hopac.Core {
using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Threading;
internal class WorkerEvent : ManualResetEventSlim {
internal int Next;
internal int Me;
internal WorkerEvent(int me) {
this.Next = -1;
this.Me = me;
}
}
unsafe internal struct Worker {
internal Work WorkStack;
internal Handler Handler;
#if TRAMPOLINE
internal byte *StackLimit;
[ThreadStatic]
internal static byte *ThreadStackLimit;
#endif
internal Scheduler Scheduler;
internal WorkerEvent Event;
internal ulong RandomLo;
internal ulong RandomHi;
[ThreadStatic]
internal static int RunningWork;
[MethodImpl(AggressiveInlining.Flag)]
internal void Init(Scheduler sr, int bytes) {
var sp = Unsafe.GetStackPtr();
#if TRAMPOLINE
var limit = ThreadStackLimit;
if (null == limit)
ThreadStackLimit = limit = sp - bytes;
this.StackLimit = limit;
#endif
this.RandomLo = (ulong)sp; // Quick and dirty (also never zero)
this.Scheduler = sr;
}
[MethodImpl(AggressiveInlining.Flag)]
internal static void Push(ref Worker wr, Work work) {
work.Next = null;
PushNew(ref wr, work, work);
}
[MethodImpl(AggressiveInlining.Flag)]
internal static void Push(ref Worker wr, Work work, Work last) {
last.Next = null;
PushNew(ref wr, work, last);
}
[MethodImpl(AggressiveInlining.Flag)]
internal static void PushNew(ref Worker wr, Work work) {
PushNew(ref wr, work, work);
}
[MethodImpl(AggressiveInlining.Flag)]
internal static void PushNew(ref Worker wr, Work work, Work last) {
Debug.Assert(null == last.Next);
var older = wr.WorkStack;
wr.WorkStack = work;
if (null != older) {
var sr = wr.Scheduler;
if (null == sr.WorkStack) {
Scheduler.PushAll(sr, older);
} else {
last.Next = older;
}
}
}
[MethodImpl(AggressiveInlining.Flag)]
internal static void ContinueOnThisThread(Scheduler sr, Work work) {
if (0 < RunningWork) {
Scheduler.PushNew(sr, work);
} else {
RunOnThisThread(sr, work);
}
}
[MethodImpl(AggressiveInlining.Flag)]
internal static void RunOnThisThread(Scheduler sr, Work work) {
var wr = new Worker();
wr.Init(sr, 8000);
var d = RunningWork;
RunningWork = d + 1;
Scheduler.Inc(sr);
try {
wr.Handler = work;
work.DoWork(ref wr);
} catch (Exception e) {
wr.WorkStack = new FailWork(wr.WorkStack, e, wr.Handler);
}
Scheduler.PushAllAndDec(sr, wr.WorkStack);
RunningWork = d;
}
[MethodImpl(AggressiveInlining.Flag)]
internal static void RunOnThisThread<T>(Scheduler sr, Job<T> tJ, Cont<T> tK) {
var wr = new Worker();
wr.Init(sr, 8000);
var d = RunningWork;
RunningWork = d + 1;
Scheduler.Inc(sr);
try {
wr.Handler = tK;
tJ.DoJob(ref wr, tK);
} catch (Exception e) {
wr.WorkStack = new FailWork(wr.WorkStack, e, wr.Handler);
}
Scheduler.PushAllAndDec(sr, wr.WorkStack);
RunningWork = d;
}
internal static void Run(Scheduler sr, int me) {
RunningWork = 1;
var wr = new Worker();
wr.Init(sr, 16000);
wr.RandomHi = (ulong)DateTime.UtcNow.Ticks;
var iK = new IdleCont();
var wdm = (1L << 32) / sr.Events.Length;
wr.Event = sr.Events[me];
while (null != sr) {
try {
Restart:
Work work = wr.WorkStack;
if (null == work)
goto EnterScheduler;
WorkerLoop:
wr.Handler = work;
{
var next = work.Next;
if (null != next && null == sr.WorkStack) {
Scheduler.PushAll(sr, next);
next = null;
}
wr.WorkStack = next;
}
work.DoWork(ref wr);
work = wr.WorkStack;
if (null != work)
goto WorkerLoop;
wr.Handler = null;
EnterScheduler:
work = sr.WorkStack;
if (null == work)
goto TryIdle;
Scheduler.Enter(sr);
EnteredScheduler:
work = sr.WorkStack;
if (null == work)
goto ExitAndTryIdle;
SchedulerGotSome: {
var last = work;
int numWorkStack = sr.NumWorkStack;
int n = (int)((numWorkStack - 1L) * wdm >> 32) + 1;
sr.NumWorkStack = numWorkStack-n;
n -= 1;
while (n > 0) {
last = last.Next;
n -= 1;
}
var next = last.Next;
last.Next = null;
last = null;
sr.WorkStack = next;
if (null != next) {
next = null;
Scheduler.UnsafeSignal(sr);
}
Scheduler.Exit(sr);
goto WorkerLoop;
}
ExitAndTryIdle:
Scheduler.Exit(sr);
TryIdle:
iK.Value = Timeout.Infinite;
var iJ = sr.IdleHandler;
if (null != iJ) {
wr.Handler = iK;
iJ.DoJob(ref wr, iK);
}
if (0 == iK.Value)
goto Restart;
Scheduler.Enter(sr);
work = sr.WorkStack;
if (null != work)
goto SchedulerGotSome;
Scheduler.UnsafeWait(sr, iK.Value, wr.Event);
goto EnteredScheduler;
} catch (KillException) {
Scheduler.Kill(sr);
Scheduler.Dec(sr);
sr = null;
} catch (Exception e) {
wr.WorkStack = new FailWork(wr.WorkStack, e, wr.Handler);
}
}
}
internal sealed class IdleCont : Cont<int> {
internal override Proc GetProc(ref Worker wr) {
throw new NotImplementedException(); // XXX: Idle job is not a process?
}
internal override void DoHandle(ref Worker wr, Exception e) {
Handler.DoHandleNull(ref wr, e);
}
internal override void DoWork(ref Worker wr) { }
internal override void DoCont(ref Worker wr, int value) {
this.Value = value;
}
}
}
}