Include in WaitingWriteCount the thread that may be waiting in upgradable mode (#113982)

eduardo-vp · web-flow · commit ddd44f25d422 · 2025-03-31T10:53:05.000-07:00
diff --git a/src/libraries/System.Private.CoreLib/src/System/Threading/ReaderWriterLockSlim.cs b/src/libraries/System.Private.CoreLib/src/System/Threading/ReaderWriterLockSlim.cs
@@ -1412,7 +1412,8 @@ public int RecursiveWriteCount
 
         public int WaitingUpgradeCount => (int)_numUpgradeWaiters;
 
-        public int WaitingWriteCount => (int)_numWriteWaiters;
+        // Include the thread that may be waiting in upgradable mode.
+        public int WaitingWriteCount => (int)_numWriteWaiters + (int)_numWriteUpgradeWaiters;
 
         private struct SpinLock
         {

Original file line number	Diff line number	Diff line change
`@@ -1412,7 +1412,8 @@ public int RecursiveWriteCount`
`1412`	`1412`
`1413`	`1413`	`public int WaitingUpgradeCount => (int)_numUpgradeWaiters;`
`1414`	`1414`
`1415`		`- public int WaitingWriteCount => (int)_numWriteWaiters;`
	`1415`	`+ // Include the thread that may be waiting in upgradable mode.`
	`1416`	`+ public int WaitingWriteCount => (int)_numWriteWaiters + (int)_numWriteUpgradeWaiters;`
`1416`	`1417`
`1417`	`1418`	`private struct SpinLock`
`1418`	`1419`	`{`