fix non-browser+threads builds

src/mono/System.Private.CoreLib/src/System/Threading/LowLevelLifoSemaphore.AsyncWait.Browser.Threads.Mono.cs

@@ -40,8 +40,8 @@ private LowLevelLifoSemaphore(int initialSignalCount, int maximumSignalCount, in
 #pragma warning disable IDE0060
     private void CreateAsyncWait(int maximumSignalCount)
     {
-        _kind = LifoSemaphoreKind.AsyncWait;
-        lifo_semaphore = InitInternal((int)_kind);
+        Kind = LifoSemaphoreKind.AsyncWait;
+        lifo_semaphore = InitInternal((int)Kind);
     }
 #pragma warning restore IDE0060
 

src/mono/System.Private.CoreLib/src/System/Threading/LowLevelLifoSemaphore.Unix.Mono.cs

@@ -8,24 +8,46 @@ namespace System.Threading
     internal sealed unsafe partial class LowLevelLifoSemaphore : IDisposable
     {
         private IntPtr lifo_semaphore;
-#if FEATURE_WASM_THREADS
+#if TARGET_BROWSER && FEATURE_WASM_THREADS
         private LifoSemaphoreKind _kind;
+#endif
+
+#pragma warning disable CA1822
+        private LifoSemaphoreKind Kind
+#pragma warning restore CA1822
+        {
+            get
+            {
+#if TARGET_BROWSER && FEATURE_WASM_THREADS
+                return _kind;
+#else
+                return LifoSemaphoreKind.Normal;
+#endif
+            }
+            set
+            {
+#if TARGET_BROWSER && FEATURE_WASM_THREADS
+                _kind = value;
+#endif
+            }
+        }
 
         // Keep in sync with lifo-semaphore.h
         private enum LifoSemaphoreKind : int {
             Normal = 1,
+#if TARGET_BROWSER && FEATURE_WASM_THREADS
             AsyncWait = 2,
-        }
 #endif
+        }
 
         [MethodImplAttribute(MethodImplOptions.InternalCall)]
         private static extern IntPtr InitInternal(int kind);
 
 #pragma warning disable IDE0060
         private void Create(int maximumSignalCount)
         {
-            _kind = LifoSemaphoreKind.Normal;
-            lifo_semaphore = InitInternal((int)_kind);
+            Kind = LifoSemaphoreKind.Normal;
+            lifo_semaphore = InitInternal((int)Kind);
         }
 #pragma warning restore IDE0060
 
@@ -36,7 +58,7 @@ public void Dispose()
         {
             DeleteInternal(lifo_semaphore);
             lifo_semaphore = IntPtr.Zero;
-            _kind = (LifoSemaphoreKind)0;
+            Kind = (LifoSemaphoreKind)0;
         }
 
         [MethodImplAttribute(MethodImplOptions.InternalCall)]
@@ -48,10 +70,14 @@ private bool WaitCore(int timeoutMs)
             return TimedWaitInternal(lifo_semaphore, timeoutMs) != 0;
         }
 
+#pragma warning disable CA1822
         private void ThrowIfInvalidSemaphoreKind(LifoSemaphoreKind expected)
+#pragma warning restore CA1822
         {
+#if TARGET_BROWSER && FEATURE_WASM_THREADS
             if (_kind != expected)
                 throw new InvalidOperationException ($"Unexpected LowLevelLifoSemaphore kind {_kind} expected {expected}");
+#endif
         }
 
         [MethodImplAttribute(MethodImplOptions.InternalCall)]