mirror of
https://github.com/mirror/processhacker
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dmex
b02427417c
git-svn-id: svn://svn.code.sf.net/p/processhacker/code@5614 21ef857c-d57f-4fe0-8362-d861dc6d29cd
92 lines
2.8 KiB
C#
92 lines
2.8 KiB
C#
/*
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* Process Hacker -
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* run once structure
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*
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* Copyright (C) 2009 wj32
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*
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* This file is part of Process Hacker.
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*
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* Process Hacker is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Process Hacker is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Process Hacker. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Threading;
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namespace ProcessHacker.Common.Threading
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{
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/// <summary>
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/// Provides methods for synchronizing the execution of a
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/// single action.
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/// </summary>
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public struct ActionSync
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{
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private int _value;
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private int _target;
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private Action _action;
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/// <summary>
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/// Initializes an action-sync structure.
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/// </summary>
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/// <param name="action">The action to be executed.</param>
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/// <param name="target">
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/// The target value required in order to execute the action.
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/// </param>
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public ActionSync(Action action, int target)
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{
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_action = action;
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_value = 0;
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_target = target;
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}
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/// <summary>
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/// Gets the current value of the action-sync structure.
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/// </summary>
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public int Value
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{
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get { return _value; }
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}
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/// <summary>
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/// Increments the current value and executes the action
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/// if the target value has been reached due to this call.
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/// </summary>
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/// <remarks>
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/// The action is guaranteed to execute exactly once,
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/// even if two threads increment the value at the same
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/// time.
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/// </remarks>
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public void Increment()
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{
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if (Interlocked.Increment(ref _value) == _target)
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_action();
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}
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/// <summary>
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/// Increments the current value and executes the action
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/// if the target value has been reached.
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/// </summary>
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/// <remarks>
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/// The action may be executed multiple times, as long
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/// as the target value has been reached.
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/// </remarks>
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public void IncrementMultiple()
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{
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if (Interlocked.Increment(ref _value) >= _target)
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_action();
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}
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}
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}
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