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173 lines
5.5 KiB
173 lines
5.5 KiB
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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using IPA.Logging;
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namespace IPA.Utilities
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{
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/// <summary>
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/// Provides utilities for managing various critical sections.
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/// </summary>
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public static class CriticalSection
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{
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internal static void Configure()
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{
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Logger.log.Debug("Configuring exit handlers");
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ResetExitHandlers();
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}
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private static void Reset(object sender, EventArgs e)
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{
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Win32.SetConsoleCtrlHandler(registeredHandler, false);
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WinHttp.SetPeekMessageHook(null);
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}
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#region Execute section
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private static readonly Win32.ConsoleCtrlDelegate registeredHandler = HandleExit;
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internal static void ResetExitHandlers()
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{
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Win32.SetConsoleCtrlHandler(registeredHandler, false);
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Win32.SetConsoleCtrlHandler(registeredHandler, true);
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WinHttp.SetPeekMessageHook(PeekMessageHook);
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}
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private static class WinHttp
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{
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public delegate bool PeekMessageHook(
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bool isW,
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uint result,
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[MarshalAs(UnmanagedType.LPStruct)]
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in Win32.MSG message,
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IntPtr hwnd,
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uint filterMin,
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uint filterMax,
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ref Win32.PeekMessageParams removeMsg);
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[DllImport("bsipa-doorstop")]
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public static extern void SetPeekMessageHook(
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[MarshalAs(UnmanagedType.FunctionPtr)]
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PeekMessageHook hook);
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}
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private static Win32.ConsoleCtrlDelegate _handler = null;
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private static volatile bool isInExecuteSection = false;
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// returns true to continue looping and calling PeekMessage
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private static bool PeekMessageHook(
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bool isW,
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uint result,
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[MarshalAs(UnmanagedType.LPStruct)]
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in Win32.MSG message,
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IntPtr hwnd,
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uint filterMin,
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uint filterMax,
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ref Win32.PeekMessageParams removeMsg)
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{
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if (isInExecuteSection)
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{
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if (result == 0) return false;
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switch (message.message)
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{
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case Win32.WM.CLOSE:
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if (removeMsg != Win32.PeekMessageParams.PM_REMOVE)
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{
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removeMsg = Win32.PeekMessageParams.PM_REMOVE;
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exitRecieved = true;
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return true;
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}
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else
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{
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removeMsg = Win32.PeekMessageParams.PM_NOREMOVE;
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return true;
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}
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default:
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return false;
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}
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}
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return false;
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}
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private static bool HandleExit(Win32.CtrlTypes type)
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{
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if (_handler != null)
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return _handler(type);
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return false;
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}
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private static volatile bool exitRecieved = false;
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/// <summary>
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/// A struct that allows <c>using</c> blocks to manage an execute section.
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/// </summary>
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public struct AutoExecuteSection : IDisposable
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{
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private readonly bool constructed;
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internal AutoExecuteSection(bool val)
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{
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constructed = val && !isInExecuteSection;
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if (constructed)
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EnterExecuteSection();
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}
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void IDisposable.Dispose()
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{
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if (constructed)
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ExitExecuteSection();
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}
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}
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/// <summary>
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/// Creates an <see cref="AutoExecuteSection"/> for automated management of an execute section.
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/// </summary>
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/// <returns>the new <see cref="AutoExecuteSection"/> that manages the section</returns>
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public static AutoExecuteSection ExecuteSection() => new AutoExecuteSection(true);
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/// <summary>
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/// Enters a critical execution section. Does not nest.
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/// </summary>
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/// <note>
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/// During a critical execution section, the program must execute until the end of the section before
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/// exiting. If an exit signal is recieved during the section, it will be canceled, and the process
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/// will terminate at the end of the section.
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/// </note>
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public static void EnterExecuteSection()
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{
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ResetExitHandlers();
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exitRecieved = false;
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_handler = sig => exitRecieved = true;
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isInExecuteSection = true;
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}
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/// <summary>
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/// Exits a critical execution section. Does not nest.
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/// </summary>
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/// <note>
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/// During a critical execution section, the program must execute until the end of the section before
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/// exiting. If an exit signal is recieved during the section, it will be canceled, and the process
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/// will terminate at the end of the section.
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/// </note>
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public static void ExitExecuteSection()
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{
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_handler = null;
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isInExecuteSection = false;
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Reset(null, null);
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if (exitRecieved)
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Environment.Exit(1);
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}
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#endregion
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}
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}
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