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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
/*=============================================================================
**
**
**
** Purpose: Base class for representing Events
**
**
=============================================================================*/
namespace System.Security.AccessControl
{
internal class EventWaitHandleSecurity
{
}
internal enum EventWaitHandleRights
{
}
}
namespace System.Threading
{
using System;
using System.Threading;
using System.Runtime.CompilerServices;
using System.IO;
using Microsoft.Win32;
using Microsoft.Win32.SafeHandles;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using System.Security.AccessControl;
using System.Diagnostics.Contracts;
[ComVisibleAttribute(true)]
public class EventWaitHandle : WaitHandle
{
public EventWaitHandle(bool initialState, EventResetMode mode) : this(initialState,mode,null) { }
public EventWaitHandle(bool initialState, EventResetMode mode, string name)
{
if(name != null)
{
#if PLATFORM_UNIX
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_NamedSynchronizationPrimitives"));
#else
if (System.IO.Path.MaxPath < name.Length)
{
throw new ArgumentException(Environment.GetResourceString("Argument_WaitHandleNameTooLong", Path.MaxPath), nameof(name));
}
#endif
}
Contract.EndContractBlock();
SafeWaitHandle _handle = null;
switch(mode)
{
case EventResetMode.ManualReset:
_handle = Win32Native.CreateEvent(null, true, initialState, name);
break;
case EventResetMode.AutoReset:
_handle = Win32Native.CreateEvent(null, false, initialState, name);
break;
default:
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidFlag",name));
};
if (_handle.IsInvalid)
{
int errorCode = Marshal.GetLastWin32Error();
_handle.SetHandleAsInvalid();
if(null != name && 0 != name.Length && Win32Native.ERROR_INVALID_HANDLE == errorCode)
throw new WaitHandleCannotBeOpenedException(Environment.GetResourceString("Threading.WaitHandleCannotBeOpenedException_InvalidHandle",name));
__Error.WinIOError(errorCode, name);
}
SetHandleInternal(_handle);
}
public EventWaitHandle(bool initialState, EventResetMode mode, string name, out bool createdNew)
: this(initialState, mode, name, out createdNew, null)
{
}
internal unsafe EventWaitHandle(bool initialState, EventResetMode mode, string name, out bool createdNew, EventWaitHandleSecurity eventSecurity)
{
if(name != null)
{
#if PLATFORM_UNIX
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_NamedSynchronizationPrimitives"));
#else
if (System.IO.Path.MaxPath < name.Length)
{
throw new ArgumentException(Environment.GetResourceString("Argument_WaitHandleNameTooLong", Path.MaxPath), nameof(name));
}
#endif
}
Contract.EndContractBlock();
Win32Native.SECURITY_ATTRIBUTES secAttrs = null;
SafeWaitHandle _handle = null;
Boolean isManualReset;
switch(mode)
{
case EventResetMode.ManualReset:
isManualReset = true;
break;
case EventResetMode.AutoReset:
isManualReset = false;
break;
default:
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidFlag",name));
};
_handle = Win32Native.CreateEvent(secAttrs, isManualReset, initialState, name);
int errorCode = Marshal.GetLastWin32Error();
if (_handle.IsInvalid)
{
_handle.SetHandleAsInvalid();
if(null != name && 0 != name.Length && Win32Native.ERROR_INVALID_HANDLE == errorCode)
throw new WaitHandleCannotBeOpenedException(Environment.GetResourceString("Threading.WaitHandleCannotBeOpenedException_InvalidHandle",name));
__Error.WinIOError(errorCode, name);
}
createdNew = errorCode != Win32Native.ERROR_ALREADY_EXISTS;
SetHandleInternal(_handle);
}
private EventWaitHandle(SafeWaitHandle handle)
{
SetHandleInternal(handle);
}
public static EventWaitHandle OpenExisting(string name)
{
return OpenExisting(name, (EventWaitHandleRights)0);
}
internal static EventWaitHandle OpenExisting(string name, EventWaitHandleRights rights)
{
EventWaitHandle result;
switch (OpenExistingWorker(name, rights, out result))
{
case OpenExistingResult.NameNotFound:
throw new WaitHandleCannotBeOpenedException();
case OpenExistingResult.NameInvalid:
throw new WaitHandleCannotBeOpenedException(Environment.GetResourceString("Threading.WaitHandleCannotBeOpenedException_InvalidHandle", name));
case OpenExistingResult.PathNotFound:
__Error.WinIOError(Win32Native.ERROR_PATH_NOT_FOUND, "");
return result; //never executes
default:
return result;
}
}
public static bool TryOpenExisting(string name, out EventWaitHandle result)
{
return OpenExistingWorker(name, (EventWaitHandleRights)0, out result) == OpenExistingResult.Success;
}
private static OpenExistingResult OpenExistingWorker(string name, EventWaitHandleRights rights, out EventWaitHandle result)
{
#if PLATFORM_UNIX
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_NamedSynchronizationPrimitives"));
#else
if (name == null)
{
throw new ArgumentNullException(nameof(name), Environment.GetResourceString("ArgumentNull_WithParamName"));
}
if(name.Length == 0)
{
throw new ArgumentException(Environment.GetResourceString("Argument_EmptyName"), nameof(name));
}
if(null != name && System.IO.Path.MaxPath < name.Length)
{
throw new ArgumentException(Environment.GetResourceString("Argument_WaitHandleNameTooLong", Path.MaxPath), nameof(name));
}
Contract.EndContractBlock();
result = null;
SafeWaitHandle myHandle = Win32Native.OpenEvent(Win32Native.EVENT_MODIFY_STATE | Win32Native.SYNCHRONIZE, false, name);
if (myHandle.IsInvalid)
{
int errorCode = Marshal.GetLastWin32Error();
if(Win32Native.ERROR_FILE_NOT_FOUND == errorCode || Win32Native.ERROR_INVALID_NAME == errorCode)
return OpenExistingResult.NameNotFound;
if (Win32Native.ERROR_PATH_NOT_FOUND == errorCode)
return OpenExistingResult.PathNotFound;
if(null != name && 0 != name.Length && Win32Native.ERROR_INVALID_HANDLE == errorCode)
return OpenExistingResult.NameInvalid;
//this is for passed through Win32Native Errors
__Error.WinIOError(errorCode,"");
}
result = new EventWaitHandle(myHandle);
return OpenExistingResult.Success;
#endif
}
public bool Reset()
{
bool res = Win32Native.ResetEvent(safeWaitHandle);
if (!res)
__Error.WinIOError();
return res;
}
public bool Set()
{
bool res = Win32Native.SetEvent(safeWaitHandle);
if (!res)
__Error.WinIOError();
return res;
}
}
}
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