mirror of
https://github.com/ShareX/ShareX.git
synced 2024-08-20 04:32:00 +12:00
29e8e739e3
Reworked single instance code to better handle being launched with context menu. Previously: - On launch, process would try to open an `EventWaitHandle`. If it didn't exist, then process assumed it was first and created it - Multiple processes launching at same time would all see the `EventWaitHandle` did not exist before any process could create it - This led to multiple instances of program running Now a mutex is used: - Processes will all try to open the mutex. Only first one will succeed - Process that opens the mutex will setup the `EventWaitHandle` - Other processes won't get the mutex and will be directed to use the `EventWaitHandle` to pass their command line args to the running instance
119 lines
No EOL
4.6 KiB
C#
119 lines
No EOL
4.6 KiB
C#
#region License Information (GPL v3)
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/*
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ShareX - A program that allows you to take screenshots and share any file type
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Copyright (c) 2007-2016 ShareX Team
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Optionally you can also view the license at <http://www.gnu.org/licenses/>.
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*/
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#endregion License Information (GPL v3)
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using System;
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using System.Diagnostics;
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using System.Runtime.Remoting;
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using System.Runtime.Remoting.Channels;
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using System.Runtime.Remoting.Channels.Ipc;
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using System.Threading;
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namespace SingleInstanceApplication
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{
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public static class ApplicationInstanceManager
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{
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private static Semaphore semaphore;
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private static string appName = "ShareX";
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private static string eventName = string.Format("{0}-{1}", Environment.MachineName, appName);
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private static string semaphoreName = string.Format("{0}{1}", eventName, "Semaphore");
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public static void CreateFirstInstance(EventHandler<InstanceCallbackEventArgs> callback)
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{
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bool createdNew;
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using (EventWaitHandle eventWaitHandle = new EventWaitHandle(false, EventResetMode.AutoReset, eventName, out createdNew))
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{
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// Mixing single instance and multi instance (via command line parameter) copies of the program can
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// result in CreateFirstInstance being called if it isn't really the first one. Make sure this is
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// really first instance by detecting if EventWaitHandle was created
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if (createdNew != true)
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{
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return;
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}
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semaphore = new Semaphore(1, 1, semaphoreName);
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ThreadPool.RegisterWaitForSingleObject(eventWaitHandle, WaitOrTimerCallback, callback, Timeout.Infinite, false);
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RegisterRemoteType(appName);
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}
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}
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public static void CreateMultipleInstance(EventHandler<InstanceCallbackEventArgs> callback, string[] args)
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{
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InstanceProxy.CommandLineArgs = args;
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using (EventWaitHandle eventWaitHandle = EventWaitHandle.OpenExisting(eventName))
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{
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semaphore = Semaphore.OpenExisting(semaphoreName);
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semaphore.WaitOne();
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UpdateRemoteObject(appName);
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if (eventWaitHandle != null) eventWaitHandle.Set();
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}
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Environment.Exit(0);
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}
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private static void UpdateRemoteObject(string uri)
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{
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IpcClientChannel clientChannel = new IpcClientChannel();
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ChannelServices.RegisterChannel(clientChannel, true);
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InstanceProxy proxy = Activator.GetObject(typeof(InstanceProxy), string.Format("ipc://{0}{1}/{1}", Environment.MachineName, uri)) as InstanceProxy;
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if (proxy != null)
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{
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proxy.SetCommandLineArgs(InstanceProxy.CommandLineArgs);
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}
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ChannelServices.UnregisterChannel(clientChannel);
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}
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private static void RegisterRemoteType(string uri)
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{
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IpcServerChannel serverChannel = new IpcServerChannel(Environment.MachineName + uri);
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ChannelServices.RegisterChannel(serverChannel, true);
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RemotingConfiguration.RegisterWellKnownServiceType(typeof(InstanceProxy), uri, WellKnownObjectMode.Singleton);
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Process process = Process.GetCurrentProcess();
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process.Exited += delegate
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{
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ChannelServices.UnregisterChannel(serverChannel);
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semaphore.Close();
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};
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}
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private static void WaitOrTimerCallback(object state, bool timedOut)
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{
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EventHandler<InstanceCallbackEventArgs> callback = state as EventHandler<InstanceCallbackEventArgs>;
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if (callback == null) return;
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callback(state, new InstanceCallbackEventArgs(InstanceProxy.CommandLineArgs));
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semaphore.Release();
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}
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}
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} |