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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using IronPython.Runtime;
using IronPython.Runtime.Exceptions;
using IronPython.Runtime.Operations;
using IronPython.Runtime.Types;
using Microsoft.Scripting;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;
using SpecialName = System.Runtime.CompilerServices.SpecialNameAttribute;
[assembly: PythonModule("_thread", typeof(IronPython.Modules.PythonThread))]
namespace IronPython.Modules {
public static class PythonThread {
public const string __doc__ = "Provides low level primitives for threading.";
private static readonly object _stackSizeKey = new object();
private static object _threadCountKey = new object();
[ThreadStatic] private static List<@lock> _sentinelLocks;
[SpecialName]
public static void PerformModuleReload(PythonContext/*!*/ context, PythonDictionary/*!*/ dict) {
context.SetModuleState(_stackSizeKey, 0);
context.EnsureModuleException("threaderror", dict, "error", "thread");
}
#region Public API Surface
public static double TIMEOUT_MAX = 0; // TODO: fill this with a proper value
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes")]
public static readonly PythonType LockType = DynamicHelpers.GetPythonTypeFromType(typeof(@lock));
[Documentation("start_new_thread(function, [args, [kwDict]]) -> thread id\nCreates a new thread running the given function")]
public static object start_new_thread(CodeContext/*!*/ context, object function, object args, object kwDict) {
PythonTuple tupArgs = args as PythonTuple;
if (tupArgs == null) throw PythonOps.TypeError("2nd arg must be a tuple");
Thread t = CreateThread(context, new ThreadObj(context, function, tupArgs, kwDict).Start);
t.Start();
return t.ManagedThreadId;
}
[Documentation("start_new_thread(function, args, [kwDict]) -> thread id\nCreates a new thread running the given function")]
public static object start_new_thread(CodeContext/*!*/ context, object function, object args) {
PythonTuple tupArgs = args as PythonTuple;
if (tupArgs == null) throw PythonOps.TypeError("2nd arg must be a tuple");
Thread t = CreateThread(context, new ThreadObj(context, function, tupArgs, null).Start);
t.IsBackground = true;
t.Start();
return t.ManagedThreadId;
}
/// <summary>
/// Stops execution of Python or other .NET code on the main thread. If the thread is
/// blocked in native code the thread will be interrupted after it returns back to Python
/// or other .NET code.
/// </summary>
public static void interrupt_main(CodeContext context) {
var thread = context.LanguageContext.MainThread;
if (thread != null) {
#pragma warning disable SYSLIB0006 // Thread.Abort is not supported and throws PlatformNotSupportedException on .NET Core.
thread.Abort(new KeyboardInterruptException(""));
#pragma warning restore SYSLIB0006
} else {
throw PythonOps.SystemError("no main thread has been registered");
}
}
public static void exit() {
PythonOps.SystemExit();
}
[Documentation("allocate_lock() -> lock object\nAllocates a new lock object that can be used for synchronization")]
public static object allocate_lock() {
return new @lock();
}
public static object get_ident() {
return Environment.CurrentManagedThreadId;
}
public static int stack_size(CodeContext/*!*/ context) {
return GetStackSize(context);
}
public static int stack_size(CodeContext/*!*/ context, int size) {
if (size < 32 * 1024 && size != 0) {
throw PythonOps.ValueError("size too small: {0}", size);
}
int oldSize = GetStackSize(context);
SetStackSize(context, size);
return oldSize;
}
// deprecated synonyms, wrappers over preferred names...
[Documentation("start_new(function, [args, [kwDict]]) -> thread id\nCreates a new thread running the given function")]
public static object start_new(CodeContext context, object function, object args) {
return start_new_thread(context, function, args);
}
public static void exit_thread() {
exit();
}
public static object allocate() {
return allocate_lock();
}
public static int _count(CodeContext context) {
return (int)context.LanguageContext.GetOrCreateModuleState<object>(_threadCountKey, () => 0);
}
[Documentation("_set_sentinel() -> lock\n\nSet a sentinel lock that will be released when the current thread\nstate is finalized (after it is untied from the interpreter).\n\nThis is a private API for the threading module.")]
public static object _set_sentinel(CodeContext context) {
if (_sentinelLocks == null) {
_sentinelLocks = new List<@lock>();
}
var obj = new @lock();
_sentinelLocks.Add(obj);
return obj;
}
#endregion
[PythonType, PythonHidden]
public class @lock {
private AutoResetEvent blockEvent;
private Thread curHolder;
public object __enter__() {
acquire(true, -1);
return this;
}
public void __exit__(CodeContext/*!*/ context, params object[] args) {
release(context);
}
public bool acquire(bool blocking = true, float timeout = -1) {
for (; ; ) {
if (Interlocked.CompareExchange<Thread>(ref curHolder, Thread.CurrentThread, null) == null) {
return true;
}
if (!blocking) {
return false;
}
if (blockEvent == null) {
// try again in case someone released us, checked the block
// event and discovered it was null so they didn't set it.
CreateBlockEvent();
continue;
}
if (!blockEvent.WaitOne(timeout < 0 ? Timeout.InfiniteTimeSpan : TimeSpan.FromSeconds(timeout))) {
return false;
}
GC.KeepAlive(this);
}
}
public void release(CodeContext/*!*/ context, params object[] param) {
release(context);
}
public void release(CodeContext/*!*/ context) {
if (Interlocked.Exchange<Thread>(ref curHolder, null) == null) {
throw PythonExceptions.CreateThrowable((PythonType)context.LanguageContext.GetModuleState("threaderror"), "lock isn't held", null);
}
if (blockEvent != null) {
// if this isn't set yet we race, it's handled in Acquire()
blockEvent.Set();
GC.KeepAlive(this);
}
}
public bool locked() {
return curHolder != null;
}
private void CreateBlockEvent() {
AutoResetEvent are = new AutoResetEvent(false);
if (Interlocked.CompareExchange<AutoResetEvent>(ref blockEvent, are, null) != null) {
are.Close();
}
}
}
#region Internal Implementation details
private static Thread CreateThread(CodeContext/*!*/ context, ThreadStart start) {
int size = GetStackSize(context);
return (size != 0) ? new Thread(start, size) : new Thread(start);
}
private class ThreadObj {
private readonly object _func, _kwargs;
private readonly PythonTuple _args;
private readonly CodeContext _context;
public ThreadObj(CodeContext context, object function, PythonTuple args, object kwargs) {
Debug.Assert(args != null);
_func = function;
_kwargs = kwargs;
_args = args;
_context = context;
}
public void Start() {
lock (_threadCountKey) {
int startCount = (int)_context.LanguageContext.GetOrCreateModuleState<object>(_threadCountKey, () => 0);
_context.LanguageContext.SetModuleState(_threadCountKey, startCount + 1);
}
try {
#pragma warning disable 618 // TODO: obsolete
if (_kwargs != null) {
PythonOps.CallWithArgsTupleAndKeywordDictAndContext(_context, _func, ArrayUtils.EmptyObjects, ArrayUtils.EmptyStrings, _args, _kwargs);
} else {
PythonOps.CallWithArgsTuple(_func, ArrayUtils.EmptyObjects, _args);
}
#pragma warning restore 618
} catch (SystemExitException) {
// ignore and quit
} catch (Exception e) {
PythonOps.PrintWithDest(_context, _context.LanguageContext.SystemStandardError, "Unhandled exception on thread");
string result = _context.LanguageContext.FormatException(e);
PythonOps.PrintWithDest(_context, _context.LanguageContext.SystemStandardError, result);
} finally {
lock (_threadCountKey) {
int curCount = (int)_context.LanguageContext.GetModuleState(_threadCountKey);
_context.LanguageContext.SetModuleState(_threadCountKey, curCount - 1);
}
// release sentinel locks if locked.
if (_sentinelLocks != null) {
foreach (var obj in _sentinelLocks) {
if (obj.locked()) {
obj.release(_context);
}
}
_sentinelLocks.Clear();
}
}
}
}
#endregion
private static int GetStackSize(CodeContext/*!*/ context) {
return (int)context.LanguageContext.GetModuleState(_stackSizeKey);
}
private static void SetStackSize(CodeContext/*!*/ context, int stackSize) {
context.LanguageContext.SetModuleState(_stackSizeKey, stackSize);
}
[PythonType]
public class _local {
private readonly PythonDictionary/*!*/ _dict = new PythonDictionary(new ThreadLocalDictionaryStorage());
#region Custom Attribute Access
[SpecialName]
public object GetCustomMember(string name) {
return _dict.get(name, OperationFailed.Value);
}
[SpecialName]
public void SetMemberAfter(string name, object value) {
_dict[name] = value;
}
[SpecialName]
public void DeleteMember(string name) {
_dict.__delitem__(name);
}
#endregion
public PythonDictionary/*!*/ __dict__ {
get {
return _dict;
}
}
#region Dictionary Storage
/// <summary>
/// Provides a dictionary storage implementation whose storage is local to
/// the thread.
/// </summary>
private class ThreadLocalDictionaryStorage : DictionaryStorage {
private readonly Microsoft.Scripting.Utils.ThreadLocal<CommonDictionaryStorage> _storage = new Microsoft.Scripting.Utils.ThreadLocal<CommonDictionaryStorage>();
public override void Add(ref DictionaryStorage storage, object key, object value) {
GetStorage().Add(key, value);
}
public override bool Contains(object key) {
return GetStorage().Contains(key);
}
public override bool Remove(ref DictionaryStorage storage, object key) {
return GetStorage().Remove(ref storage, key);
}
public override DictionaryStorage AsMutable(ref DictionaryStorage storage) => this;
public override bool TryGetValue(object key, out object value) {
return GetStorage().TryGetValue(key, out value);
}
public override int Count {
get { return GetStorage().Count; }
}
public override void Clear(ref DictionaryStorage storage) {
GetStorage().Clear(ref storage);
}
public override List<KeyValuePair<object, object>>/*!*/ GetItems() {
return GetStorage().GetItems();
}
private CommonDictionaryStorage/*!*/ GetStorage() {
return _storage.GetOrCreate(() => new CommonDictionaryStorage());
}
}
#endregion
}
}
}