diff --git a/indra/llcommon/llapr.cpp b/indra/llcommon/llapr.cpp
index ee7717f12..d16b87cd7 100644
--- a/indra/llcommon/llapr.cpp
+++ b/indra/llcommon/llapr.cpp
@@ -88,7 +88,7 @@ bool ll_apr_warn_status(apr_status_t status)
 
 void ll_apr_assert_status(apr_status_t status)
 {
-	llassert(ll_apr_warn_status(status) == false);
+	llassert(!ll_apr_warn_status(status));
 }
 
 //---------------------------------------------------------------------
@@ -146,7 +146,7 @@ apr_status_t LLAPRFile::open(std::string const& filename, apr_int32_t flags, acc
 
 	apr_status_t status;
 	{
-		apr_pool_t* apr_file_open_pool;
+		apr_pool_t* apr_file_open_pool;	// The use of apr_pool_t is OK here.
 										// This is a temporary variable for a pool that is passed directly to apr_file_open below.
 		if (access_type == short_lived)
 		{
@@ -199,7 +199,6 @@ apr_status_t LLAPRFile::open(const std::string& filename, apr_int32_t flags, BOO
 // File I/O
 S32 LLAPRFile::read(void *buf, S32 nbytes)
 {
-	//llassert_always(mFile); (ASC-TUDCC) -HgB
 	if(!mFile) 
 	{
 		llwarns << "apr mFile is removed by somebody else. Can not read." << llendl ;
@@ -222,7 +221,6 @@ S32 LLAPRFile::read(void *buf, S32 nbytes)
 
 S32 LLAPRFile::write(const void *buf, S32 nbytes)
 {
-	// llassert_always(mFile); (ASC-TUDCC) -HgB
 	if(!mFile) 
 	{
 		llwarns << "apr mFile is removed by somebody else. Can not write." << llendl ;
diff --git a/indra/llcommon/llapr.h b/indra/llcommon/llapr.h
index e7c3c53f1..3574e1790 100644
--- a/indra/llcommon/llapr.h
+++ b/indra/llcommon/llapr.h
@@ -113,7 +113,7 @@ typedef LLAtomic32<U32> LLAtomicU32;
 typedef LLAtomic32<S32> LLAtomicS32;
 
 // File IO convenience functions.
-// Returns NULL if the file fails to openm sets *sizep to file size of not NULL
+// Returns NULL if the file fails to open, sets *sizep to file size if not NULL
 // abbreviated flags
 #define LL_APR_R (APR_READ) // "r"
 #define LL_APR_W (APR_CREATE|APR_TRUNCATE|APR_WRITE) // "w"
@@ -131,7 +131,7 @@ typedef LLAtomic32<S32> LLAtomicS32;
 //      especially do not put some time-costly operations between open() and close().
 //      otherwise it might lock the APRFilePool.
 //there are two different apr_pools the APRFile can use:
-//      1, a temperary pool passed to an APRFile function, which is used within this function and only once.
+//      1, a temporary pool passed to an APRFile function, which is used within this function and only once.
 //      2, a global pool.
 //
 
@@ -189,7 +189,7 @@ public:
 };
 
 /**
- * @brief Function which approprately logs error or remains quiet on
+ * @brief Function which appropriately logs error or remains quiet on
  * APR_SUCCESS.
  * @return Returns <code>true</code> if status is an error condition.
  */
diff --git a/indra/llcommon/llaprpool.h b/indra/llcommon/llaprpool.h
index 133f60316..dc123e942 100644
--- a/indra/llcommon/llaprpool.h
+++ b/indra/llcommon/llaprpool.h
@@ -60,9 +60,9 @@ extern void ll_init_apr();
 class LL_COMMON_API LLAPRPool
 {
 protected:
-	apr_pool_t* mPool;					//!< Pointer to the underlaying pool. NULL if not initialized.
+	apr_pool_t* mPool;			//!< Pointer to the underlaying pool. NULL if not initialized.
 	LLAPRPool* mParent;			//!< Pointer to the parent pool, if any. Only valid when mPool is non-zero.
-	apr_os_thread_t mOwner;				//!< The thread that owns this memory pool. Only valid when mPool is non-zero.
+	apr_os_thread_t mOwner;		//!< The thread that owns this memory pool. Only valid when mPool is non-zero.
 
 public:
 	//! Construct an uninitialized (destructed) pool.
diff --git a/indra/llcommon/llthread.cpp b/indra/llcommon/llthread.cpp
index 8ae458c1c..ef52dde46 100644
--- a/indra/llcommon/llthread.cpp
+++ b/indra/llcommon/llthread.cpp
@@ -399,6 +399,15 @@ LLMutexBase::LLMutexBase() :
 {
 }
 
+bool LLMutexBase::isSelfLocked() const
+{
+#if LL_DARWIN
+	return mLockingThread == LLThread::currentID();
+#else
+	return mLockingThread == local_thread_ID;
+#endif
+}
+
 void LLMutexBase::lock() 
 { 
 #if LL_DARWIN
@@ -431,7 +440,7 @@ void LLMutexBase::unlock()
 
 	apr_thread_mutex_unlock(mAPRMutexp);
 }
-	
+
 //----------------------------------------------------------------------------
 
 //static
diff --git a/indra/llcommon/llthread.h b/indra/llcommon/llthread.h
index f0e4f39f5..c5a06f19c 100644
--- a/indra/llcommon/llthread.h
+++ b/indra/llcommon/llthread.h
@@ -73,7 +73,7 @@ class LL_COMMON_API LLThread
 {
 private:
 	static U32 sIDIter;
-	
+
 public:
 	typedef enum e_thread_status
 	{
@@ -179,13 +179,17 @@ public:
 
 	LLMutexBase() ;
 	
-	void lock();		//blocks
+	void lock();		// blocks
 	void unlock();
 	// Returns true if lock was obtained successfully.
 	bool tryLock() { return !APR_STATUS_IS_EBUSY(apr_thread_mutex_trylock(mAPRMutexp)); }
 
 	// non-blocking, but does do a lock/unlock so not free
 	bool isLocked() { bool is_not_locked = tryLock(); if (is_not_locked) unlock(); return !is_not_locked; }
+
+	// Returns true if locked by this thread.
+	bool isSelfLocked() const;
+
 	// get ID of locking thread
 	U32 lockingThread() const { return mLockingThread; }