From f4ff6334df8a3fd66d13082606b69a78fa592237 Mon Sep 17 00:00:00 2001
From: Jacob Palecki <JacobPalecki@gmail.com>
Date: Tue, 22 Sep 2020 15:26:08 -0700
Subject: Remove sigmoidgain, only allow one instance of grapher to run at a
 time

---
 grapher/Program.cs | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'grapher/Program.cs')

diff --git a/grapher/Program.cs b/grapher/Program.cs
index 85fd040..485e074 100644
--- a/grapher/Program.cs
+++ b/grapher/Program.cs
@@ -11,9 +11,19 @@ namespace grapher
         [STAThread]
         static void Main()
         {
+            var mutex = new System.Threading.Mutex(true, "RawAccelGrapher", out bool result);
+
+            if (!result)
+            {
+                MessageBox.Show("Another instance of the Raw Accel Grapher is already running.");
+                return;
+            }
+
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
             Application.Run(new RawAcceleration());
+            
+            GC.KeepAlive(mutex);
         }
     }
 }
-- 
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