Lock before writing to potentially shared file

Since there's no guarantee we won't get the same query simultaneously, we need to lock before attempting to write to the temp file to avoid collisions.

Author: kzu

src/JQ/JQ.cs

@@ -2,7 +2,6 @@
 using System.Diagnostics;
 using System.IO;
 using System.Runtime.InteropServices;
-using System.Runtime.Intrinsics.Arm;
 using System.Security.Cryptography;
 using System.Text;
 using System.Threading.Tasks;
@@ -19,6 +18,7 @@ namespace Devlooped;
 /// </remarks>
 public static class JQ
 {
+    static readonly object syncLock = new();
     static readonly string jqpath;
 
     static JQ()
@@ -83,7 +83,13 @@ public static async Task<string> ExecuteAsync(string json, string query)
             var hash = BitConverter.ToString(SHA256.HashData(Encoding.UTF8.GetBytes(normalized)));
             var queryFile = System.IO.Path.Combine(System.IO.Path.GetTempPath(), $"{hash}.jq");
             if (!File.Exists(queryFile))
-                await File.WriteAllTextAsync(queryFile, normalized);
+            {
+                lock (syncLock)
+                {
+                    if (!File.Exists(queryFile))
+                        File.WriteAllText(queryFile, normalized);
+                }
+            }
 
             var jq = await Cli.Wrap(jqpath)
                 .WithArguments(["-r", "-f", queryFile])