Added some resilience in the GetCurrentProcess calls so it doesn't cause a Fatal exit.

src/NzbDrone.App.Test/MonitoringProviderTest.cs

@@ -1,35 +0,0 @@
-using System;
-using FizzWare.NBuilder;
-using Moq;
-using NUnit.Framework;
-using NzbDrone.Common.Model;
-using NzbDrone.Common.Processes;
-using NzbDrone.Host;
-using NzbDrone.Test.Common;
-
-namespace NzbDrone.App.Test
-{
-    [TestFixture]
-    public class MonitoringProviderTest : TestBase<PriorityMonitor>
-    {
-        [Test]
-        public void Ensure_priority_doesnt_fail_on_invalid_process_id()
-        {
-            Mocker.GetMock<IProcessProvider>().Setup(c => c.GetCurrentProcess())
-                .Returns(Builder<ProcessInfo>.CreateNew().Build());
-
-            Mocker.GetMock<IProcessProvider>().Setup(c => c.GetProcessById(It.IsAny<int>())).Returns((ProcessInfo)null);
-
-            Subject.EnsurePriority(null);
-        }
-
-        [Test]
-        public void Ensure_should_log_warn_exception_rather_than_throw()
-        {
-            Mocker.GetMock<IProcessProvider>().Setup(c => c.GetCurrentProcess()).Throws<InvalidOperationException>();
-            Subject.EnsurePriority(null);
-
-            ExceptionVerification.ExpectedWarns(1);
-        }
-    }
-}

src/NzbDrone.App.Test/NzbDrone.Host.Test.csproj

@@ -60,7 +60,6 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="ContainerFixture.cs" />
-    <Compile Include="MonitoringProviderTest.cs" />
     <Compile Include="NzbDroneProcessServiceFixture.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="RouterTest.cs" />

src/NzbDrone.Common/EnvironmentInfo/RuntimeInfoBase.cs

@@ -12,7 +12,6 @@ namespace NzbDrone.Common.EnvironmentInfo
     public abstract class RuntimeInfoBase : IRuntimeInfo
     {
         private readonly Logger _logger;
-        private static readonly string ProcessName = Process.GetCurrentProcess().ProcessName.ToLower();
 
         public RuntimeInfoBase(IServiceProvider serviceProvider, Logger logger)
         {
@@ -73,10 +72,12 @@ namespace NzbDrone.Common.EnvironmentInfo
         { 
             get
             {
-                return (OsInfo.IsWindows &&
-                        IsUserInteractive &&
-                        ProcessName.Equals(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME, StringComparison.InvariantCultureIgnoreCase)) ||
-                       OsInfo.IsMono;
+                if (OsInfo.IsWindows)
+                {
+                    return IsUserInteractive && Process.GetCurrentProcess().ProcessName.Equals(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME, StringComparison.InvariantCultureIgnoreCase);
+                }
+
+                return true;
             } 
         }
 
@@ -93,11 +94,19 @@ namespace NzbDrone.Common.EnvironmentInfo
             if (BuildInfo.IsDebug || Debugger.IsAttached) return false;
             if (BuildInfo.Version.Revision > 10000) return false; //Official builds will never have such a high revision
 
-            var lowerProcessName = ProcessName.ToLower();
-            if (lowerProcessName.Contains("vshost")) return false;
-            if (lowerProcessName.Contains("nunit")) return false;
-            if (lowerProcessName.Contains("jetbrain")) return false;
-            if (lowerProcessName.Contains("resharper")) return false;
+            try
+            {
+                var lowerProcessName = Process.GetCurrentProcess().ProcessName.ToLower();
+
+                if (lowerProcessName.Contains("vshost")) return false;
+                if (lowerProcessName.Contains("nunit")) return false;
+                if (lowerProcessName.Contains("jetbrain")) return false;
+                if (lowerProcessName.Contains("resharper")) return false;
+            }
+            catch
+            {
+                
+            }
 
             string lowerCurrentDir = Directory.GetCurrentDirectory().ToLower();
             if (lowerCurrentDir.Contains("teamcity")) return false;

src/NzbDrone.Host/ApplicationServer.cs

@@ -21,23 +21,20 @@ namespace NzbDrone.Host
         private readonly IConfigFileProvider _configFileProvider;
         private readonly IRuntimeInfo _runtimeInfo;
         private readonly IHostController _hostController;
-        private readonly PriorityMonitor _priorityMonitor;
         private readonly IStartupContext _startupContext;
         private readonly IBrowserService _browserService;
         private readonly Logger _logger;
 
-        public NzbDroneServiceFactory(IConfigFileProvider configFileProvider, 
+        public NzbDroneServiceFactory(IConfigFileProvider configFileProvider,
                                       IHostController hostController,
-                                      IRuntimeInfo runtimeInfo, 
-                                      PriorityMonitor priorityMonitor, 
-                                      IStartupContext startupContext, 
-                                      IBrowserService browserService, 
+                                      IRuntimeInfo runtimeInfo,
+                                      IStartupContext startupContext,
+                                      IBrowserService browserService,
                                       Logger logger)
         {
             _configFileProvider = configFileProvider;
             _hostController = hostController;
             _runtimeInfo = runtimeInfo;
-            _priorityMonitor = priorityMonitor;
             _startupContext = startupContext;
             _browserService = browserService;
             _logger = logger;
@@ -63,8 +60,6 @@ namespace NzbDrone.Host
             {
                 _browserService.LaunchWebUI();
             }
-
-            _priorityMonitor.Start();
         }
 
         protected override void OnStop()

src/NzbDrone.Host/NzbDrone.Host.csproj

@@ -116,7 +116,6 @@
     <Compile Include="Owin\OwinTraceOutputFactory.cs" />
     <Compile Include="Owin\PortInUseException.cs" />
     <Compile Include="PlatformValidation.cs" />
-    <Compile Include="PriorityMonitor.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Router.cs" />
     <Compile Include="SingleInstancePolicy.cs" />

src/NzbDrone.Host/PriorityMonitor.cs

@@ -1,52 +0,0 @@
-using System;
-using System.Diagnostics;
-using System.Threading;
-using NLog;
-using NzbDrone.Common.EnvironmentInfo;
-using NzbDrone.Common.Processes;
-
-namespace NzbDrone.Host
-{
-    public class PriorityMonitor
-    {
-        private readonly IProcessProvider _processProvider;
-        private readonly Logger _logger;
-
-        private Timer _processPriorityCheckTimer;
-
-        public PriorityMonitor(IProcessProvider processProvider, Logger logger)
-        {
-            _processProvider = processProvider;
-            _logger = logger;
-        }
-
-        public void Start()
-        {
-            _processPriorityCheckTimer = new Timer(EnsurePriority);
-            _processPriorityCheckTimer.Change(TimeSpan.FromSeconds(15), TimeSpan.FromMinutes(30));
-        }
-
-        public virtual void EnsurePriority(object sender)
-        {
-            try
-            {
-                if (_processProvider.GetCurrentProcessPriority() != ProcessPriorityClass.Normal)
-                {
-                    _processProvider.SetPriority(_processProvider.GetCurrentProcess().Id, ProcessPriorityClass.Normal);
-                }
-            }
-            catch (Exception e)
-            {
-                if (OsInfo.IsMono)
-                {
-                    _logger.TraceException("Unable to verify priority", e);
-                }
-
-                else
-                {
-                    _logger.WarnException("Unable to verify priority", e);
-                }
-            }
-        }
-    }
-}

src/NzbDrone.Host/SingleInstancePolicy.cs

@@ -52,19 +52,28 @@ namespace NzbDrone.Host
 
         private List<int> GetOtherNzbDroneProcessIds()
         {
-            var currentId = _processProvider.GetCurrentProcess().Id;
-            var otherProcesses = _processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME)
-                                                 .Union(_processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_PROCESS_NAME))
-                                                 .Select(c => c.Id)
-                                                 .Except(new[] {currentId})
-                                                 .ToList();
+            try
+            {
+                var currentId = _processProvider.GetCurrentProcess().Id;
+
+                var otherProcesses = _processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME)
+                                                     .Union(_processProvider.FindProcessByName(ProcessProvider.NZB_DRONE_PROCESS_NAME))
+                                                     .Select(c => c.Id)
+                                                     .Except(new[] { currentId })
+                                                     .ToList();
+
+                if (otherProcesses.Any())
+                {
+                    _logger.Info("{0} instance(s) of NzbDrone are running", otherProcesses.Count);
+                }
 
-            if (otherProcesses.Any())
+                return otherProcesses;
+            }
+            catch (Exception ex)
             {
-                _logger.Info("{0} instance(s) of NzbDrone are running", otherProcesses.Count);
+                _logger.WarnException("Failed to check for multiple instances of NzbDrone.", ex);
+                return new List<int>();
             }
-
-            return otherProcesses;
         }
     }
 }