fix: profiler flaky tests (#3118)

Author: vaind

src/Sentry.Profiling/SampleProfilerSession.cs

@@ -51,17 +51,29 @@ private SampleProfilerSession(SentryStopwatch stopwatch, EventPipeSession sessio
 
     public TraceLog TraceLog => _eventSource.TraceLog;
 
-    internal static bool ThrowOnNextStartupForTests = false;
+    // default is false, set 1 for true.
+    private static int _throwOnNextStartupForTests = 0;
+
+    internal static bool ThrowOnNextStartupForTests
+    {
+        get { return Interlocked.CompareExchange(ref _throwOnNextStartupForTests, 1, 1) == 1; }
+        set
+        {
+            if (value)
+                Interlocked.CompareExchange(ref _throwOnNextStartupForTests, 1, 0);
+            else
+                Interlocked.CompareExchange(ref _throwOnNextStartupForTests, 0, 1);
+        }
+    }
 
     public static SampleProfilerSession StartNew(IDiagnosticLogger? logger = null)
     {
         try
         {
             var client = new DiagnosticsClient(Environment.ProcessId);
 
-            if (ThrowOnNextStartupForTests)
+            if (Interlocked.CompareExchange(ref _throwOnNextStartupForTests, 0, 1) == 1)
             {
-                ThrowOnNextStartupForTests = false;
                 throw new Exception("Test exception");
             }
 

test/Sentry.Profiling.Tests/SamplingTransactionProfilerTests.cs

@@ -88,7 +88,7 @@ private void RunForMs(int milliseconds)
         while (clock.ElapsedMilliseconds < milliseconds)
         {
             _testOutputLogger.LogDebug("Sleeping... time remaining: {0} ms", milliseconds - clock.ElapsedMilliseconds);
-            Thread.Sleep((int)Math.Min(milliseconds / 5, milliseconds - clock.ElapsedMilliseconds));
+            Thread.Sleep((int)Math.Max(0, Math.Min(milliseconds / 5, milliseconds - clock.ElapsedMilliseconds)));
         }
     }
 

test/Sentry.Tests/ProfilerTests.cs

@@ -85,7 +85,7 @@ private void RunForMs(int milliseconds)
         while (clock.ElapsedMilliseconds < milliseconds)
         {
             _testOutputLogger.LogDebug("Sleeping... time remaining: {0} ms", milliseconds - clock.ElapsedMilliseconds);
-            Thread.Sleep((int)Math.Min(milliseconds / 5, milliseconds - clock.ElapsedMilliseconds));
+            Thread.Sleep((int)Math.Max(0, Math.Min(milliseconds / 5, milliseconds - clock.ElapsedMilliseconds)));
         }
     }
 }