Fix non-thread-safe refcounting of LLHTTPClient::Responder and fix out-of-order deletion of LLTextureFetch on shutdown

2 files changed, 48 insertions, 17 deletions

diff --git a/indra/llcommon/llthread.cpp b/indra/llcommon/llthread.cpp
index a6ad6b125c..c2fbb544a8 100644
--- a/indra/llcommon/llthread.cpp
+++ b/indra/llcommon/llthread.cpp
@@ -114,7 +114,7 @@ LLThread::LLThread(const std::string& name, apr_pool_t *poolp) :
 		apr_pool_create(&mAPRPoolp, NULL); // Create a subpool for this thread
 	}
 	mRunCondition = new LLCondition(mAPRPoolp);
-
+	mDataLock = new LLMutex(mAPRPoolp);
 	mLocalAPRFilePoolp = NULL ;
 }
 
@@ -173,7 +173,10 @@ void LLThread::shutdown()
 	}
 
 	delete mRunCondition;
-	mRunCondition = 0;
+	mRunCondition = NULL;
+
+	delete mDataLock;
+	mDataLock = NULL;
 	
 	if (mIsLocalPool && mAPRPoolp)
 	{
@@ -242,28 +245,30 @@ bool LLThread::runCondition(void)
 // Stop thread execution if requested until unpaused.
 void LLThread::checkPause()
 {
-	mRunCondition->lock();
+	mDataLock->lock();
 
 	// This is in a while loop because the pthread API allows for spurious wakeups.
 	while(shouldSleep())
 	{
+		mDataLock->unlock();
 		mRunCondition->wait(); // unlocks mRunCondition
+		mDataLock->lock();
 		// mRunCondition is locked when the thread wakes up
 	}
 	
- 	mRunCondition->unlock();
+ 	mDataLock->unlock();
 }
 
 //============================================================================
 
 void LLThread::setQuitting()
 {
-	mRunCondition->lock();
+	mDataLock->lock();
 	if (mStatus == RUNNING)
 	{
 		mStatus = QUITTING;
 	}
-	mRunCondition->unlock();
+	mDataLock->unlock();
 	wake();
 }
 
@@ -285,12 +290,12 @@ void LLThread::yield()
 
 void LLThread::wake()
 {
-	mRunCondition->lock();
+	mDataLock->lock();
 	if(!shouldSleep())
 	{
 		mRunCondition->signal();
 	}
-	mRunCondition->unlock();
+	mDataLock->unlock();
 }
 
 void LLThread::wakeLocked()
@@ -481,6 +486,19 @@ LLThreadSafeRefCount::LLThreadSafeRefCount() :
 {
 }
 
+LLThreadSafeRefCount::LLThreadSafeRefCount(const LLThreadSafeRefCount& src)
+{
+	if (sMutex)
+	{
+		sMutex->lock();
+	}
+	mRef = 0;
+	if (sMutex)
+	{
+		sMutex->unlock();
+	}
+}
+
 LLThreadSafeRefCount::~LLThreadSafeRefCount()
 { 
 	if (mRef != 0)
@@ -489,6 +507,7 @@ LLThreadSafeRefCount::~LLThreadSafeRefCount()
 	}
 }
 
+
 //============================================================================
 
 LLResponder::~LLResponder()
diff --git a/indra/llcommon/llthread.h b/indra/llcommon/llthread.h
index b52e70ab2e..892e144911 100644
--- a/indra/llcommon/llthread.h
+++ b/indra/llcommon/llthread.h
@@ -97,6 +97,7 @@ private:
 protected:
 	std::string			mName;
 	LLCondition*		mRunCondition;
+	LLMutex*			mDataLock;
 
 	apr_thread_t		*mAPRThreadp;
 	apr_pool_t			*mAPRPoolp;
@@ -122,15 +123,15 @@ protected:
 	inline void unlockData();
 	
 	// This is the predicate that decides whether the thread should sleep.  
-	// It should only be called with mRunCondition locked, since the virtual runCondition() function may need to access
+	// It should only be called with mDataLock locked, since the virtual runCondition() function may need to access
 	// data structures that are thread-unsafe.
 	bool shouldSleep(void) { return (mStatus == RUNNING) && (isPaused() || (!runCondition())); }
 
 	// To avoid spurious signals (and the associated context switches) when the condition may or may not have changed, you can do the following:
-	// mRunCondition->lock();
+	// mDataLock->lock();
 	// if(!shouldSleep())
 	//     mRunCondition->signal();
-	// mRunCondition->unlock();
+	// mDataLock->unlock();
 };
 
 //============================================================================
@@ -205,12 +206,12 @@ private:
 
 void LLThread::lockData()
 {
-	mRunCondition->lock();
+	mDataLock->lock();
 }
 
 void LLThread::unlockData()
 {
-	mRunCondition->unlock();
+	mDataLock->unlock();
 }
 
 
@@ -227,15 +228,26 @@ public:
 private:
 	static LLMutex* sMutex;
 
-private:
-	LLThreadSafeRefCount(const LLThreadSafeRefCount&); // not implemented
-	LLThreadSafeRefCount&operator=(const LLThreadSafeRefCount&); // not implemented
-
 protected:
 	virtual ~LLThreadSafeRefCount(); // use unref()
 	
 public:
 	LLThreadSafeRefCount();
+	LLThreadSafeRefCount(const LLThreadSafeRefCount&);
+	LLThreadSafeRefCount&operator=(const LLThreadSafeRefCount& ref) 
+	{
+		if (sMutex)
+		{
+			sMutex->lock();
+		}
+		mRef = 0;
+		if (sMutex)
+		{
+			sMutex->unlock();
+		}
+	}
+
+
 	
 	void ref()
 	{