Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Threading / EventWaitHandle.cs / 1 / EventWaitHandle.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================================== ** ** Class: EventWaitHandle ** ** ** Purpose: Base class for representing Events ** ** =============================================================================*/ namespace System.Threading { using System; using System.Threading; using System.Runtime.CompilerServices; using System.Security.Permissions; using System.IO; using Microsoft.Win32; using Microsoft.Win32.SafeHandles; using System.Runtime.InteropServices; using System.Runtime.Versioning; #if !FEATURE_PAL using System.Security.AccessControl; #endif [HostProtection(Synchronization=true, ExternalThreading=true)] [ComVisibleAttribute(true)] public class EventWaitHandle : WaitHandle { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public EventWaitHandle(bool initialState, EventResetMode mode) : this(initialState,mode,null) { } [SecurityPermissionAttribute(SecurityAction.LinkDemand,Flags=SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public EventWaitHandle(bool initialState, EventResetMode mode, string name) { if(null != name && System.IO.Path.MAX_PATH < name.Length) { throw new ArgumentException(Environment.GetResourceString("Argument_WaitHandleNameTooLong",name)); } 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, ""); } SetHandleInternal(_handle); } [SecurityPermissionAttribute(SecurityAction.LinkDemand,Flags=SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public EventWaitHandle(bool initialState, EventResetMode mode, string name, out bool createdNew) #if !FEATURE_PAL : this(initialState, mode, name, out createdNew, null) { } [SecurityPermissionAttribute(SecurityAction.LinkDemand,Flags=SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public unsafe EventWaitHandle(bool initialState, EventResetMode mode, string name, out bool createdNew, EventWaitHandleSecurity eventSecurity) #endif { if(null != name && System.IO.Path.MAX_PATH < name.Length) { throw new ArgumentException(Environment.GetResourceString("Argument_WaitHandleNameTooLong",name)); } Win32Native.SECURITY_ATTRIBUTES secAttrs = null; #if !FEATURE_PAL // For ACL's, get the security descriptor from the EventWaitHandleSecurity. if (eventSecurity != null) { secAttrs = new Win32Native.SECURITY_ATTRIBUTES(); secAttrs.nLength = (int)Marshal.SizeOf(secAttrs); byte[] sd = eventSecurity.GetSecurityDescriptorBinaryForm(); byte* pSecDescriptor = stackalloc byte[sd.Length]; Buffer.memcpy(sd, 0, pSecDescriptor, 0, sd.Length); secAttrs.pSecurityDescriptor = pSecDescriptor; } #endif 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); } [SecurityPermissionAttribute(SecurityAction.LinkDemand,Flags=SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public static EventWaitHandle OpenExisting(string name) { #if !FEATURE_PAL return OpenExisting(name, EventWaitHandleRights.Modify | EventWaitHandleRights.Synchronize); } [SecurityPermissionAttribute(SecurityAction.LinkDemand,Flags=SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public static EventWaitHandle OpenExisting(string name, EventWaitHandleRights rights) { #endif // !FEATURE_PAL if (name == null) { throw new ArgumentNullException("name", Environment.GetResourceString("ArgumentNull_WithParamName")); } if(name.Length == 0) { throw new ArgumentException(Environment.GetResourceString("Argument_EmptyName"), "name"); } if(null != name && System.IO.Path.MAX_PATH < name.Length) { throw new ArgumentException(Environment.GetResourceString("Argument_WaitHandleNameTooLong",name)); } #if FEATURE_PAL SafeWaitHandle myHandle = Win32Native.OpenEvent(Win32Native.EVENT_MODIFY_STATE | Win32Native.SYNCHRONIZE, false, name); #else SafeWaitHandle myHandle = Win32Native.OpenEvent((int) rights, false, name); #endif if (myHandle.IsInvalid) { int errorCode = Marshal.GetLastWin32Error(); if(Win32Native.ERROR_FILE_NOT_FOUND == errorCode || Win32Native.ERROR_INVALID_NAME == errorCode) throw new WaitHandleCannotBeOpenedException(); if(null != name && 0 != name.Length && Win32Native.ERROR_INVALID_HANDLE == errorCode) throw new WaitHandleCannotBeOpenedException(Environment.GetResourceString("Threading.WaitHandleCannotBeOpenedException_InvalidHandle",name)); //this is for passed through Win32Native Errors __Error.WinIOError(errorCode,""); } return new EventWaitHandle(myHandle); } 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; } #if !FEATURE_PAL public EventWaitHandleSecurity GetAccessControl() { return new EventWaitHandleSecurity(safeWaitHandle, AccessControlSections.Access | AccessControlSections.Owner | AccessControlSections.Group); } public void SetAccessControl(EventWaitHandleSecurity eventSecurity) { if (eventSecurity == null) throw new ArgumentNullException("eventSecurity"); eventSecurity.Persist(safeWaitHandle); } #endif } }
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