SL-16094: Fix merge glitches from previous revert.

indra/llcommon/llthreadsafequeue.h

@@ -85,8 +85,8 @@ class LLThreadSafeQueue
 	LLThreadSafeQueue(U32 capacity = 1024);
 	virtual ~LLThreadSafeQueue() {}
 
-	// Add an element to the queue (will block if the queue has
-	// reached capacity).
+	// Add an element to the queue (will block if the queue has reached
+	// capacity).
 	//
 	// This call will raise an interrupt error if the queue is closed while
 	// the caller is blocked.
@@ -95,6 +95,11 @@ class LLThreadSafeQueue
 	// legacy name
 	void pushFront(ElementT const & element) { return push(element); }
 
+	// Add an element to the queue (will block if the queue has reached
+	// capacity). Return false if the queue is closed before push is possible.
+	template <typename T>
+	bool pushIfOpen(T&& element);
+
 	// Try to add an element to the queue without blocking. Returns
 	// true only if the element was actually added.
 	template <typename T>
@@ -314,8 +319,8 @@ bool LLThreadSafeQueue<ElementT, QueueT>::push_(lock_t& lock, T&& element)
 
 
 template <typename ElementT, typename QueueT>
-template<typename T>
-void LLThreadSafeQueue<ElementT, QueueT>::push(T&& element)
+template <typename T>
+bool LLThreadSafeQueue<ElementT, QueueT>::pushIfOpen(T&& element)
 {
     LL_PROFILE_ZONE_SCOPED;
     lock_t lock1(mLock);
@@ -325,12 +330,10 @@ void LLThreadSafeQueue<ElementT, QueueT>::push(T&& element)
         // drained or not: the moment either end calls close(), further push()
         // operations will fail.
         if (mClosed)
-        {
-            LLTHROW(LLThreadSafeQueueInterrupt());
-        }
+            return false;
 
         if (push_(lock1, std::forward<T>(element)))
-            return;
+            return true;
 
         // Storage Full. Wait for signal.
         mCapacityCond.wait(lock1);