Merge branch 'master' into DRTVWR-501-maint

# Conflicts:
#	autobuild.xml
#	indra/newview/llimprocessing.cpp

13 files changed, 534 insertions, 210 deletions

diff --git a/indra/llmessage/CMakeLists.txt b/indra/llmessage/CMakeLists.txt
index e0922c0667..2f99ca069e 100644
--- a/indra/llmessage/CMakeLists.txt
+++ b/indra/llmessage/CMakeLists.txt
@@ -217,7 +217,7 @@ target_link_libraries(
   ${NGHTTP2_LIBRARIES}
   ${XMLRPCEPI_LIBRARIES}
   ${LLCOREHTTP_LIBRARIES}
-  ${BOOST_COROUTINE_LIBRARY}
+  ${BOOST_FIBER_LIBRARY}
   ${BOOST_CONTEXT_LIBRARY}
   ${BOOST_SYSTEM_LIBRARY}
   rt
@@ -235,7 +235,7 @@ target_link_libraries(
   ${NGHTTP2_LIBRARIES}
   ${XMLRPCEPI_LIBRARIES}
   ${LLCOREHTTP_LIBRARIES}
-  ${BOOST_COROUTINE_LIBRARY}
+  ${BOOST_FIBER_LIBRARY}
   ${BOOST_CONTEXT_LIBRARY}
   ${BOOST_SYSTEM_LIBRARY}
   )
@@ -244,6 +244,7 @@ endif(LINUX)
 # tests
 if (LL_TESTS)
   SET(llmessage_TEST_SOURCE_FILES
+    llcoproceduremanager.cpp
     llnamevalue.cpp
     lltrustedmessageservice.cpp
     lltemplatemessagedispatcher.cpp
@@ -264,7 +265,7 @@ if (LINUX)
     ${LLMESSAGE_LIBRARIES}
     ${LLCOREHTTP_LIBRARIES}
     ${JSONCPP_LIBRARIES}
-    ${BOOST_COROUTINE_LIBRARY}
+    ${BOOST_FIBER_LIBRARY}
     ${BOOST_CONTEXT_LIBRARY}
     rt
     ${GOOGLEMOCK_LIBRARIES}
@@ -280,7 +281,7 @@ else (LINUX)
     ${LLMESSAGE_LIBRARIES}
     ${LLCOREHTTP_LIBRARIES}
     ${JSONCPP_LIBRARIES}
-    ${BOOST_COROUTINE_LIBRARY}
+    ${BOOST_FIBER_LIBRARY}
     ${BOOST_CONTEXT_LIBRARY}
     ${GOOGLEMOCK_LIBRARIES}
     )
diff --git a/indra/llmessage/llavatarnamecache.cpp b/indra/llmessage/llavatarnamecache.cpp
index 6a287f0cc5..fbd65cc67b 100644
--- a/indra/llmessage/llavatarnamecache.cpp
+++ b/indra/llmessage/llavatarnamecache.cpp
@@ -134,7 +134,7 @@ LLAvatarNameCache::~LLAvatarNameCache()
 
 void LLAvatarNameCache::requestAvatarNameCache_(std::string url, std::vector<LLUUID> agentIds)
 {
-    LL_DEBUGS("AvNameCache") << "Entering coroutine " << LLCoros::instance().getName()
+    LL_DEBUGS("AvNameCache") << "Entering coroutine " << LLCoros::getName()
         << " with url '" << url << "', requesting " << agentIds.size() << " Agent Ids" << LL_ENDL;
 
     // Check pointer that can be cleaned up by cleanupClass()
@@ -188,7 +188,7 @@ void LLAvatarNameCache::requestAvatarNameCache_(std::string url, std::vector<LLU
     }
     catch (...)
     {
-        LOG_UNHANDLED_EXCEPTION(STRINGIZE("coroutine " << LLCoros::instance().getName()
+        LOG_UNHANDLED_EXCEPTION(STRINGIZE("coroutine " << LLCoros::getName()
                                           << "('" << url << "', " << agentIds.size()
                                           << " http result: " << httpResults.asString()
                                           << " Agent Ids)"));
diff --git a/indra/llmessage/llbuffer.cpp b/indra/llmessage/llbuffer.cpp
index 1a0eceba0f..cfe38605ad 100644
--- a/indra/llmessage/llbuffer.cpp
+++ b/indra/llmessage/llbuffer.cpp
@@ -32,6 +32,7 @@
 #include "llmath.h"
 #include "llstl.h"
 #include "llthread.h"
+#include "llmutex.h"
 #include <iterator>
 
 #define ASSERT_LLBUFFERARRAY_MUTEX_LOCKED() llassert(!mMutexp || mMutexp->isSelfLocked())
diff --git a/indra/llmessage/llbufferstream.cpp b/indra/llmessage/llbufferstream.cpp
index ff1c9993cc..39508c1c52 100644
--- a/indra/llmessage/llbufferstream.cpp
+++ b/indra/llmessage/llbufferstream.cpp
@@ -31,6 +31,7 @@
 
 #include "llbuffer.h"
 #include "llthread.h"
+#include "llmutex.h"
 
 static const S32 DEFAULT_OUTPUT_SEGMENT_SIZE = 1024 * 4;
 
diff --git a/indra/llmessage/llcoproceduremanager.cpp b/indra/llmessage/llcoproceduremanager.cpp
index 74cdff2b00..a7bd836c4d 100644
--- a/indra/llmessage/llcoproceduremanager.cpp
+++ b/indra/llmessage/llcoproceduremanager.cpp
@@ -25,23 +25,29 @@
 * $/LicenseInfo$
 */
 
-#include "linden_common.h" 
+#include "llwin32headers.h"
+
+#include "linden_common.h"
+
 #include "llcoproceduremanager.h"
+
+#include <chrono>
+
+#include <boost/fiber/buffered_channel.hpp>
+
 #include "llexception.h"
 #include "stringize.h"
-#include <boost/assign.hpp>
 
 //=========================================================================
 // Map of pool sizes for known pools
-// *TODO$: When C++11 this can be initialized here as follows:
-// = {{"AIS", 25}, {"Upload", 1}}
-static std::map<std::string, U32> DefaultPoolSizes = 
-    boost::assign::map_list_of
-        (std::string("Upload"),  1)
-        (std::string("AIS"),     1);    
-        // *TODO: Rider for the moment keep AIS calls serialized otherwise the COF will tend to get out of sync.
+static const std::map<std::string, U32> DefaultPoolSizes{
+	{std::string("Upload"),  1},
+    {std::string("AIS"),     1},
+    // *TODO: Rider for the moment keep AIS calls serialized otherwise the COF will tend to get out of sync.
+};
 
-#define DEFAULT_POOL_SIZE 5
+static const U32 DEFAULT_POOL_SIZE = 5;
+static const U32 DEFAULT_QUEUE_SIZE = 4096;
 
 //=========================================================================
 class LLCoprocedurePool: private boost::noncopyable
@@ -50,7 +56,7 @@ public:
     typedef LLCoprocedureManager::CoProcedure_t CoProcedure_t;
 
     LLCoprocedurePool(const std::string &name, size_t size);
-    virtual ~LLCoprocedurePool();
+    ~LLCoprocedurePool();
 
     /// Places the coprocedure on the queue for processing. 
     /// 
@@ -60,20 +66,11 @@ public:
     /// @return This method returns a UUID that can be used later to cancel execution.
     LLUUID enqueueCoprocedure(const std::string &name, CoProcedure_t proc);
 
-    /// Cancel a coprocedure. If the coprocedure is already being actively executed 
-    /// this method calls cancelSuspendedOperation() on the associated HttpAdapter
-    /// If it has not yet been dequeued it is simply removed from the queue.
-    bool cancelCoprocedure(const LLUUID &id);
-
-    /// Requests a shutdown of the upload manager. Passing 'true' will perform 
-    /// an immediate kill on the upload coroutine.
-    void shutdown(bool hardShutdown = false);
-
     /// Returns the number of coprocedures in the queue awaiting processing.
     ///
     inline size_t countPending() const
     {
-        return mPendingCoprocs.size();
+        return mPending;
     }
 
     /// Returns the number of coprocedures actively being processed.
@@ -90,6 +87,8 @@ public:
         return countPending() + countActive();
     }
 
+    void close();
+    
 private:
     struct QueuedCoproc
     {
@@ -106,25 +105,29 @@ private:
         CoProcedure_t mProc;
     };
 
-    // we use a deque here rather than std::queue since we want to be able to 
-    // iterate through the queue and potentially erase an entry from the middle.
-    typedef std::deque<QueuedCoproc::ptr_t>  CoprocQueue_t;
+    // we use a buffered_channel here rather than unbuffered_channel since we want to be able to 
+    // push values without blocking,even if there's currently no one calling a pop operation (due to
+    // fiber running right now)
+    typedef boost::fibers::buffered_channel<QueuedCoproc::ptr_t>  CoprocQueue_t;
+    // Use shared_ptr to control the lifespan of our CoprocQueue_t instance
+    // because the consuming coroutine might outlive this LLCoprocedurePool
+    // instance.
+    typedef boost::shared_ptr<CoprocQueue_t> CoprocQueuePtr;
     typedef std::map<LLUUID, LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t> ActiveCoproc_t;
 
     std::string     mPoolName;
-    size_t          mPoolSize;
-    CoprocQueue_t   mPendingCoprocs;
+    size_t          mPoolSize, mPending{0};
+    CoprocQueuePtr  mPendingCoprocs;
     ActiveCoproc_t  mActiveCoprocs;
-    bool            mShutdown;
-    LLEventStream   mWakeupTrigger;
+    LLTempBoundListener mStatusListener;
 
     typedef std::map<std::string, LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t> CoroAdapterMap_t;
     LLCore::HttpRequest::policy_t mHTTPPolicy;
 
     CoroAdapterMap_t mCoroMapping;
 
-    void coprocedureInvokerCoro(LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t httpAdapter);
-
+    void coprocedureInvokerCoro(CoprocQueuePtr pendingCoprocs,
+                                LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t httpAdapter);
 };
 
 //=========================================================================
@@ -134,7 +137,7 @@ LLCoprocedureManager::LLCoprocedureManager()
 
 LLCoprocedureManager::~LLCoprocedureManager()
 {
-
+    close();
 }
 
 LLCoprocedureManager::poolPtr_t LLCoprocedureManager::initializePool(const std::string &poolName)
@@ -143,33 +146,34 @@ LLCoprocedureManager::poolPtr_t LLCoprocedureManager::initializePool(const std::
     std::string keyName = "PoolSize" + poolName;
     int size = 0;
 
-    if (poolName.empty())
-        LL_ERRS("CoprocedureManager") << "Poolname must not be empty" << LL_ENDL;
+    LL_ERRS_IF(poolName.empty(), "CoprocedureManager") << "Poolname must not be empty" << LL_ENDL;
 
-    if (mPropertyQueryFn && !mPropertyQueryFn.empty())
+    if (mPropertyQueryFn)
     {
         size = mPropertyQueryFn(keyName);
     }
 
     if (size == 0)
-    {   // if not found grab the know default... if there is no known 
+    {
+        // if not found grab the know default... if there is no known 
         // default use a reasonable number like 5.
-        std::map<std::string, U32>::iterator it = DefaultPoolSizes.find(poolName);
-        if (it == DefaultPoolSizes.end())
-            size = DEFAULT_POOL_SIZE;
-        else
-            size = (*it).second;
+        auto it = DefaultPoolSizes.find(poolName);
+        size = (it != DefaultPoolSizes.end()) ? it->second : DEFAULT_POOL_SIZE;
 
-        if (mPropertyDefineFn && !mPropertyDefineFn.empty())
+        if (mPropertyDefineFn)
+        {
             mPropertyDefineFn(keyName, size, "Coroutine Pool size for " + poolName);
-        LL_WARNS() << "LLCoprocedureManager: No setting for \"" << keyName << "\" setting pool size to default of " << size << LL_ENDL;
+        }
+
+        LL_WARNS("CoProcMgr") << "LLCoprocedureManager: No setting for \"" << keyName << "\" setting pool size to default of " << size << LL_ENDL;
     }
 
     poolPtr_t pool(new LLCoprocedurePool(poolName, size));
-    mPoolMap.insert(poolMap_t::value_type(poolName, pool));
+    LL_ERRS_IF(!pool, "CoprocedureManager") << "Unable to create pool named \"" << poolName << "\" FATAL!" << LL_ENDL;
+
+    bool inserted = mPoolMap.emplace(poolName, pool).second;
+    LL_ERRS_IF(!inserted, "CoprocedureManager") << "Unable to add pool named \"" << poolName << "\" to map. FATAL!" << LL_ENDL;
 
-    if (!pool)
-        LL_ERRS("CoprocedureManager") << "Unable to create pool named \"" << poolName << "\" FATAL!" << LL_ENDL;
     return pool;
 }
 
@@ -178,40 +182,13 @@ LLUUID LLCoprocedureManager::enqueueCoprocedure(const std::string &pool, const s
 {
     // Attempt to find the pool and enqueue the procedure.  If the pool does 
     // not exist, create it.
-    poolPtr_t targetPool;
     poolMap_t::iterator it = mPoolMap.find(pool);
 
-    if (it == mPoolMap.end())
-    {
-        targetPool = initializePool(pool);
-    }
-    else
-    {
-        targetPool = (*it).second;
-    }
+    poolPtr_t targetPool = (it != mPoolMap.end()) ? it->second : initializePool(pool);
 
     return targetPool->enqueueCoprocedure(name, proc);
 }
 
-void LLCoprocedureManager::cancelCoprocedure(const LLUUID &id)
-{
-    for (poolMap_t::const_iterator it = mPoolMap.begin(); it != mPoolMap.end(); ++it)
-    {
-        if ((*it).second->cancelCoprocedure(id))
-            return;
-    }
-    LL_INFOS() << "Coprocedure not found." << LL_ENDL;
-}
-
-void LLCoprocedureManager::shutdown(bool hardShutdown)
-{
-    for (poolMap_t::const_iterator it = mPoolMap.begin(); it != mPoolMap.end(); ++it)
-    {
-        (*it).second->shutdown(hardShutdown);
-    }
-    mPoolMap.clear();
-}
-
 void LLCoprocedureManager::setPropertyMethods(SettingQuery_t queryfn, SettingUpdate_t updatefn)
 {
     mPropertyQueryFn = queryfn;
@@ -222,9 +199,9 @@ void LLCoprocedureManager::setPropertyMethods(SettingQuery_t queryfn, SettingUpd
 size_t LLCoprocedureManager::countPending() const
 {
     size_t count = 0;
-    for (poolMap_t::const_iterator it = mPoolMap.begin(); it != mPoolMap.end(); ++it)
+    for (const auto& pair : mPoolMap)
     {
-        count += (*it).second->countPending();
+        count += pair.second->countPending();
     }
     return count;
 }
@@ -235,7 +212,7 @@ size_t LLCoprocedureManager::countPending(const std::string &pool) const
 
     if (it == mPoolMap.end())
         return 0;
-    return (*it).second->countPending();
+    return it->second->countPending();
 }
 
 size_t LLCoprocedureManager::countActive() const
@@ -243,7 +220,7 @@ size_t LLCoprocedureManager::countActive() const
     size_t count = 0;
     for (poolMap_t::const_iterator it = mPoolMap.begin(); it != mPoolMap.end(); ++it)
     {
-        count += (*it).second->countActive();
+        count += it->second->countActive();
     }
     return count;
 }
@@ -253,16 +230,18 @@ size_t LLCoprocedureManager::countActive(const std::string &pool) const
     poolMap_t::const_iterator it = mPoolMap.find(pool);
 
     if (it == mPoolMap.end())
+    {
         return 0;
-    return (*it).second->countActive();
+    }
+    return it->second->countActive();
 }
 
 size_t LLCoprocedureManager::count() const
 {
     size_t count = 0;
-    for (poolMap_t::const_iterator it = mPoolMap.begin(); it != mPoolMap.end(); ++it)
+    for (const auto& pair : mPoolMap)
     {
-        count += (*it).second->count();
+        count += pair.second->count();
     }
     return count;
 }
@@ -273,59 +252,70 @@ size_t LLCoprocedureManager::count(const std::string &pool) const
 
     if (it == mPoolMap.end())
         return 0;
-    return (*it).second->count();
+    return it->second->count();
+}
+
+void LLCoprocedureManager::close()
+{
+    for(auto & poolEntry : mPoolMap)
+    {
+        poolEntry.second->close();
+    }
+}
+
+void LLCoprocedureManager::close(const std::string &pool)
+{
+    poolMap_t::iterator it = mPoolMap.find(pool);
+    if (it != mPoolMap.end())
+    {
+        it->second->close();
+    }
 }
 
 //=========================================================================
 LLCoprocedurePool::LLCoprocedurePool(const std::string &poolName, size_t size):
     mPoolName(poolName),
     mPoolSize(size),
-    mPendingCoprocs(),
-    mShutdown(false),
-    mWakeupTrigger("CoprocedurePool" + poolName, true),
-    mCoroMapping(),
-    mHTTPPolicy(LLCore::HttpRequest::DEFAULT_POLICY_ID)
+    mPendingCoprocs(boost::make_shared<CoprocQueue_t>(DEFAULT_QUEUE_SIZE)),
+    mHTTPPolicy(LLCore::HttpRequest::DEFAULT_POLICY_ID),
+    mCoroMapping()
 {
+    // store in our LLTempBoundListener so that when the LLCoprocedurePool is
+    // destroyed, we implicitly disconnect from this LLEventPump
+    mStatusListener = LLEventPumps::instance().obtain("LLApp").listen(
+        poolName,
+        [pendingCoprocs=mPendingCoprocs, poolName](const LLSD& status)
+        {
+            auto& statsd = status["status"];
+            if (statsd.asString() != "running")
+            {
+                LL_INFOS("CoProcMgr") << "Pool " << poolName
+                                      << " closing queue because status " << statsd
+                                      << LL_ENDL;
+                // This should ensure that all waiting coprocedures in this
+                // pool will wake up and terminate.
+                pendingCoprocs->close();
+            }
+            return false;
+        });
+
     for (size_t count = 0; count < mPoolSize; ++count)
     {
         LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t httpAdapter(new LLCoreHttpUtil::HttpCoroutineAdapter( mPoolName + "Adapter", mHTTPPolicy));
 
-        std::string pooledCoro = LLCoros::instance().launch("LLCoprocedurePool("+mPoolName+")::coprocedureInvokerCoro",
-            boost::bind(&LLCoprocedurePool::coprocedureInvokerCoro, this, httpAdapter));
+        std::string pooledCoro = LLCoros::instance().launch(
+            "LLCoprocedurePool("+mPoolName+")::coprocedureInvokerCoro",
+            boost::bind(&LLCoprocedurePool::coprocedureInvokerCoro, this,
+                        mPendingCoprocs, httpAdapter));
 
         mCoroMapping.insert(CoroAdapterMap_t::value_type(pooledCoro, httpAdapter));
     }
 
-    LL_INFOS() << "Created coprocedure pool named \"" << mPoolName << "\" with " << size << " items." << LL_ENDL;
-
-    mWakeupTrigger.post(LLSD());
+    LL_INFOS("CoProcMgr") << "Created coprocedure pool named \"" << mPoolName << "\" with " << size << " items, queue max " << DEFAULT_QUEUE_SIZE << LL_ENDL;
 }
 
 LLCoprocedurePool::~LLCoprocedurePool() 
 {
-    shutdown();
-}
-
-//-------------------------------------------------------------------------
-void LLCoprocedurePool::shutdown(bool hardShutdown)
-{
-    CoroAdapterMap_t::iterator it;
-
-    for (it = mCoroMapping.begin(); it != mCoroMapping.end(); ++it)
-    {
-        if (hardShutdown)
-        {
-            LLCoros::instance().kill((*it).first);
-        }
-        if ((*it).second)
-        {
-            (*it).second->cancelSuspendedOperation();
-        }
-    }
-
-    mShutdown = true;
-    mCoroMapping.clear();
-    mPendingCoprocs.clear();
 }
 
 //-------------------------------------------------------------------------
@@ -333,76 +323,94 @@ LLUUID LLCoprocedurePool::enqueueCoprocedure(const std::string &name, LLCoproced
 {
     LLUUID id(LLUUID::generateNewID());
 
-    mPendingCoprocs.push_back(QueuedCoproc::ptr_t(new QueuedCoproc(name, id, proc)));
-    LL_INFOS() << "Coprocedure(" << name << ") enqueued with id=" << id.asString() << " in pool \"" << mPoolName << "\"" << LL_ENDL;
-
-    mWakeupTrigger.post(LLSD());
-
-    return id;
-}
-
-bool LLCoprocedurePool::cancelCoprocedure(const LLUUID &id)
-{
-    // first check the active coroutines.  If there, remove it and return.
-    ActiveCoproc_t::iterator itActive = mActiveCoprocs.find(id);
-    if (itActive != mActiveCoprocs.end())
+    LL_INFOS("CoProcMgr") << "Coprocedure(" << name << ") enqueuing with id=" << id.asString() << " in pool \"" << mPoolName << "\" at " << mPending << LL_ENDL;
+    auto pushed = mPendingCoprocs->try_push(boost::make_shared<QueuedCoproc>(name, id, proc));
+    if (pushed == boost::fibers::channel_op_status::success)
     {
-        LL_INFOS() << "Found and canceling active coprocedure with id=" << id.asString() << " in pool \"" << mPoolName << "\"" << LL_ENDL;
-        (*itActive).second->cancelSuspendedOperation();
-        mActiveCoprocs.erase(itActive);
-        return true;
+        ++mPending;
+        return id;
     }
 
-    for (CoprocQueue_t::iterator it = mPendingCoprocs.begin(); it != mPendingCoprocs.end(); ++it)
+    // Here we didn't succeed in pushing. Shutdown could be the reason.
+    if (pushed == boost::fibers::channel_op_status::closed)
     {
-        if ((*it)->mId == id)
-        {
-            LL_INFOS() << "Found and removing queued coroutine(" << (*it)->mName << ") with Id=" << id.asString() << " in pool \"" << mPoolName << "\"" << LL_ENDL;
-            mPendingCoprocs.erase(it);
-            return true;
-        }
+        LL_WARNS("CoProcMgr") << "Discarding coprocedure '" << name << "' because shutdown" << LL_ENDL;
+        return {};
     }
 
-    LL_INFOS() << "Coprocedure with Id=" << id.asString() << " was not found in pool \"" << mPoolName << "\"" << LL_ENDL;
-    return false;
+    // The queue should never fill up.
+    LL_ERRS("CoProcMgr") << "Enqueue failed (" << unsigned(pushed) << ")" << LL_ENDL;
+    return {};                      // never executed, pacify the compiler
 }
 
 //-------------------------------------------------------------------------
-void LLCoprocedurePool::coprocedureInvokerCoro(LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t httpAdapter)
+void LLCoprocedurePool::coprocedureInvokerCoro(
+    CoprocQueuePtr pendingCoprocs,
+    LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t httpAdapter)
 {
-    LLCore::HttpRequest::ptr_t httpRequest(new LLCore::HttpRequest);
-
-    while (!mShutdown)
+    for (;;)
     {
-        llcoro::suspendUntilEventOn(mWakeupTrigger);
-        if (mShutdown)
+        // It is VERY IMPORTANT that we instantiate a new ptr_t just before
+        // the pop_wait_for() call below. When this ptr_t was declared at
+        // function scope (outside the for loop), NickyD correctly diagnosed a
+        // mysterious hang condition due to:
+        // - the second time through the loop, the ptr_t held the last pointer
+        //   to the previous QueuedCoproc, which indirectly held the last
+        //   LLPointer to an LLInventoryCallback instance
+        // - while holding the lock on pendingCoprocs, pop_wait_for() assigned
+        //   the popped value to the ptr_t variable
+        // - assignment destroyed the previous value of that variable, which
+        //   indirectly destroyed the LLInventoryCallback
+        // - whose destructor called ~LLRequestServerAppearanceUpdateOnDestroy()
+        // - which called LLAppearanceMgr::requestServerAppearanceUpdate()
+        // - which called enqueueCoprocedure()
+        // - which tried to acquire the lock on pendingCoprocs... alas.
+        // Using a fresh, clean ptr_t ensures that no previous value is
+        // destroyed during pop_wait_for().
+        QueuedCoproc::ptr_t coproc;
+        boost::fibers::channel_op_status status;
+        {
+            LLCoros::TempStatus st("waiting for work for 10s");
+            status = pendingCoprocs->pop_wait_for(coproc, std::chrono::seconds(10));
+        }
+        if (status == boost::fibers::channel_op_status::closed)
+        {
             break;
-        
-        while (!mPendingCoprocs.empty())
+        }
+
+        if(status == boost::fibers::channel_op_status::timeout)
         {
-            QueuedCoproc::ptr_t coproc = mPendingCoprocs.front();
-            mPendingCoprocs.pop_front();
-            ActiveCoproc_t::iterator itActive = mActiveCoprocs.insert(ActiveCoproc_t::value_type(coproc->mId, httpAdapter)).first;
+            LL_DEBUGS_ONCE("CoProcMgr") << "pool '" << mPoolName << "' waiting." << LL_ENDL;
+            continue;
+        }
+        // we actually popped an item
+        --mPending;
 
-            LL_INFOS() << "Dequeued and invoking coprocedure(" << coproc->mName << ") with id=" << coproc->mId.asString() << " in pool \"" << mPoolName << "\"" << LL_ENDL;
+        ActiveCoproc_t::iterator itActive = mActiveCoprocs.insert(ActiveCoproc_t::value_type(coproc->mId, httpAdapter)).first;
 
-            try
-            {
-                coproc->mProc(httpAdapter, coproc->mId);
-            }
-            catch (...)
-            {
-                LOG_UNHANDLED_EXCEPTION(STRINGIZE("Coprocedure('" << coproc->mName
-                                                  << "', id=" << coproc->mId.asString()
-                                                  << ") in pool '" << mPoolName << "'"));
-                // must NOT omit this or we deplete the pool
-                mActiveCoprocs.erase(itActive);
-                throw;
-            }
-
-            LL_INFOS() << "Finished coprocedure(" << coproc->mName << ")" << " in pool \"" << mPoolName << "\"" << LL_ENDL;
+        LL_DEBUGS("CoProcMgr") << "Dequeued and invoking coprocedure(" << coproc->mName << ") with id=" << coproc->mId.asString() << " in pool \"" << mPoolName << "\" (" << mPending << " left)" << LL_ENDL;
 
+        try
+        {
+            coproc->mProc(httpAdapter, coproc->mId);
+        }
+        catch (...)
+        {
+            LOG_UNHANDLED_EXCEPTION(STRINGIZE("Coprocedure('" << coproc->mName
+                                              << "', id=" << coproc->mId.asString()
+                                              << ") in pool '" << mPoolName << "'"));
+            // must NOT omit this or we deplete the pool
             mActiveCoprocs.erase(itActive);
+            continue;
         }
+
+        LL_DEBUGS("CoProcMgr") << "Finished coprocedure(" << coproc->mName << ")" << " in pool \"" << mPoolName << "\"" << LL_ENDL;
+
+        mActiveCoprocs.erase(itActive);
     }
 }
+
+void LLCoprocedurePool::close()
+{
+    mPendingCoprocs->close();
+}
diff --git a/indra/llmessage/llcoproceduremanager.h b/indra/llmessage/llcoproceduremanager.h
index 7d0e83180c..70204ba02b 100644
--- a/indra/llmessage/llcoproceduremanager.h
+++ b/indra/llmessage/llcoproceduremanager.h
@@ -32,6 +32,7 @@
 #include "llcoros.h"
 #include "llcorehttputil.h"
 #include "lluuid.h"
+#include <boost/smart_ptr/shared_ptr.hpp>
 
 class LLCoprocedurePool;
 
@@ -57,11 +58,7 @@ public:
     /// Cancel a coprocedure. If the coprocedure is already being actively executed 
     /// this method calls cancelYieldingOperation() on the associated HttpAdapter
     /// If it has not yet been dequeued it is simply removed from the queue.
-    void cancelCoprocedure(const LLUUID &id);
-
-    /// Requests a shutdown of the upload manager. Passing 'true' will perform 
-    /// an immediate kill on the upload coroutine.
-    void shutdown(bool hardShutdown = false);
+    //void cancelCoprocedure(const LLUUID &id);
 
     void setPropertyMethods(SettingQuery_t queryfn, SettingUpdate_t updatefn);
 
@@ -80,6 +77,9 @@ public:
     size_t count() const;
     size_t count(const std::string &pool) const;
 
+    void close();
+    void close(const std::string &pool);
+    
 private:
 
     typedef boost::shared_ptr<LLCoprocedurePool> poolPtr_t;
diff --git a/indra/llmessage/llexperiencecache.cpp b/indra/llmessage/llexperiencecache.cpp
index aa7b3c1260..7d96ac4b02 100644
--- a/indra/llmessage/llexperiencecache.cpp
+++ b/indra/llmessage/llexperiencecache.cpp
@@ -338,10 +338,10 @@ void LLExperienceCache::requestExperiences()
 	F64 now = LLFrameTimer::getTotalSeconds();
 
     const U32 EXP_URL_SEND_THRESHOLD = 3000;
-    const U32 PAGE_SIZE = EXP_URL_SEND_THRESHOLD / UUID_STR_LENGTH;
+    const U32 PAGE_SIZE1 = EXP_URL_SEND_THRESHOLD / UUID_STR_LENGTH;
 
     std::ostringstream ostr;
-    ostr << urlBase << "?page_size=" << PAGE_SIZE;
+    ostr << urlBase << "?page_size=" << PAGE_SIZE1;
     RequestQueue_t  requests;
 
     while (!mRequestQueue.empty())
@@ -360,7 +360,7 @@ void LLExperienceCache::requestExperiences()
                 boost::bind(&LLExperienceCache::requestExperiencesCoro, this, _1, ostr.str(), requests) );
 
             ostr.str(std::string());
-            ostr << urlBase << "?page_size=" << PAGE_SIZE;
+            ostr << urlBase << "?page_size=" << PAGE_SIZE1;
             requests.clear();
         }
     }
diff --git a/indra/llmessage/lliosocket.cpp b/indra/llmessage/lliosocket.cpp
index 7caf0766b7..a9cc71c365 100644
--- a/indra/llmessage/lliosocket.cpp
+++ b/indra/llmessage/lliosocket.cpp
@@ -62,9 +62,9 @@ bool is_addr_in_use(apr_status_t status)
 #endif
 }
 
-#if LL_LINUX
+#if ! LL_WINDOWS
 // Define this to see the actual file descriptors being tossed around.
-//#define LL_DEBUG_SOCKET_FILE_DESCRIPTORS 1
+#define LL_DEBUG_SOCKET_FILE_DESCRIPTORS 1
 #if LL_DEBUG_SOCKET_FILE_DESCRIPTORS
 #include "apr_portable.h"
 #endif
@@ -77,7 +77,7 @@ void ll_debug_socket(const char* msg, apr_socket_t* apr_sock)
 #if LL_DEBUG_SOCKET_FILE_DESCRIPTORS
 	if(!apr_sock)
 	{
-		LL_DEBUGS() << "Socket -- " << (msg?msg:"") << ": no socket." << LL_ENDL;
+		LL_DEBUGS("Socket") << "Socket -- " << (msg?msg:"") << ": no socket." << LL_ENDL;
 		return;
 	}
 	// *TODO: Why doesn't this work?
@@ -85,12 +85,12 @@ void ll_debug_socket(const char* msg, apr_socket_t* apr_sock)
 	int os_sock;
 	if(APR_SUCCESS == apr_os_sock_get(&os_sock, apr_sock))
 	{
-		LL_DEBUGS() << "Socket -- " << (msg?msg:"") << " on fd " << os_sock
+		LL_DEBUGS("Socket") << "Socket -- " << (msg?msg:"") << " on fd " << os_sock
 			<< " at " << apr_sock << LL_ENDL;
 	}
 	else
 	{
-		LL_DEBUGS() << "Socket -- " << (msg?msg:"") << " no fd "
+		LL_DEBUGS("Socket") << "Socket -- " << (msg?msg:"") << " no fd "
 			<< " at " << apr_sock << LL_ENDL;
 	}
 #endif
@@ -144,6 +144,9 @@ LLSocket::ptr_t LLSocket::create(apr_pool_t* pool, EType type, U16 port, const c
 		if(new_pool) apr_pool_destroy(new_pool);
 		return rv;
 	}
+	// At this point, the new LLSocket instance takes ownership of new_pool,
+	// which is why no early return below this call explicitly destroys it: it
+	// is instead cleaned up by ~LLSocket().
 	rv = ptr_t(new LLSocket(socket, new_pool));
 	if(port > 0)
 	{
@@ -186,7 +189,7 @@ LLSocket::ptr_t LLSocket::create(apr_pool_t* pool, EType type, U16 port, const c
 			}
 		}
 	}
-	else
+	else // port <= 0
 	{
 		// we need to indicate that we have an ephemeral port if the
 		// previous calls were successful. It will
diff --git a/indra/llmessage/llproxy.cpp b/indra/llmessage/llproxy.cpp
index 950599217f..86bcfe6881 100644
--- a/indra/llmessage/llproxy.cpp
+++ b/indra/llmessage/llproxy.cpp
@@ -115,9 +115,9 @@ S32 LLProxy::proxyHandshake(LLHost proxy)
 		U32 request_size = socks_username.size() + socks_password.size() + 3;
 		char * password_auth = new char[request_size];
 		password_auth[0] = 0x01;
-		password_auth[1] = socks_username.size();
+		password_auth[1] = (char)(socks_username.size());
 		memcpy(&password_auth[2], socks_username.c_str(), socks_username.size());
-		password_auth[socks_username.size() + 2] = socks_password.size();
+		password_auth[socks_username.size() + 2] = (char)(socks_password.size());
 		memcpy(&password_auth[socks_username.size() + 3], socks_password.c_str(), socks_password.size());
 
 		authmethod_password_reply_t password_reply;
diff --git a/indra/llmessage/llproxy.h b/indra/llmessage/llproxy.h
index 87891901ad..a1ffa9e5d5 100644
--- a/indra/llmessage/llproxy.h
+++ b/indra/llmessage/llproxy.h
@@ -32,6 +32,7 @@
 #include "llmemory.h"
 #include "llsingleton.h"
 #include "llthread.h"
+#include "llmutex.h"
 #include <curl/curl.h>
 #include <string>
 
diff --git a/indra/llmessage/message.cpp b/indra/llmessage/message.cpp
index 6ef4025ab1..da62bb12e8 100644
--- a/indra/llmessage/message.cpp
+++ b/indra/llmessage/message.cpp
@@ -117,8 +117,8 @@ void LLMessageHandlerBridge::post(LLHTTPNode::ResponsePtr response,
 	gMessageSystem->mLastSender = LLHost(input["sender"].asString());
 	gMessageSystem->mPacketsIn += 1;
 	gMessageSystem->mLLSDMessageReader->setMessage(namePtr, input["body"]);
-	gMessageSystem->mMessageReader = gMessageSystem->mLLSDMessageReader;
-	
+	LockMessageReader rdr(gMessageSystem->mMessageReader, gMessageSystem->mLLSDMessageReader);
+
 	if(gMessageSystem->callHandler(namePtr, false, gMessageSystem))
 	{
 		response->result(LLSD());
@@ -189,7 +189,7 @@ void LLMessageSystem::init()
 	mTimingCallbackData = NULL;
 
 	mMessageBuilder = NULL;
-	mMessageReader = NULL;
+	LockMessageReader(mMessageReader, NULL);
 }
 
 // Read file and build message templates
@@ -230,7 +230,6 @@ LLMessageSystem::LLMessageSystem(const std::string& filename, U32 port,
 
 	mTemplateMessageReader = new LLTemplateMessageReader(mMessageNumbers);
 	mLLSDMessageReader = new LLSDMessageReader();
-	mMessageReader = NULL;
 
 	// initialize various bits of net info
 	mSocket = 0;
@@ -330,7 +329,6 @@ LLMessageSystem::~LLMessageSystem()
 	
 	delete mTemplateMessageReader;
 	mTemplateMessageReader = NULL;
-	mMessageReader = NULL;
 
 	delete mTemplateMessageBuilder;
 	mTemplateMessageBuilder = NULL;
@@ -480,11 +478,12 @@ LLCircuitData* LLMessageSystem::findCircuit(const LLHost& host,
 }
 
 // Returns TRUE if a valid, on-circuit message has been received.
-BOOL LLMessageSystem::checkMessages( S64 frame_count )
+// Requiring a non-const LockMessageChecker reference ensures that
+// mMessageReader has been set to mTemplateMessageReader.
+BOOL LLMessageSystem::checkMessages(LockMessageChecker&, S64 frame_count )
 {
 	// Pump 
 	BOOL	valid_packet = FALSE;
-	mMessageReader = mTemplateMessageReader;
 
 	LLTransferTargetVFile::updateQueue();
 	
@@ -748,7 +747,7 @@ S32	LLMessageSystem::getReceiveBytes() const
 }
 
 
-void LLMessageSystem::processAcks(F32 collect_time)
+void LLMessageSystem::processAcks(LockMessageChecker&, F32 collect_time)
 {
 	F64Seconds mt_sec = getMessageTimeSeconds();
 	{
@@ -2062,8 +2061,9 @@ void LLMessageSystem::dispatch(
 		return;
 	}
 	// enable this for output of message names
-	//LL_INFOS("Messaging") << "< \"" << msg_name << "\"" << LL_ENDL;
-	//LL_DEBUGS() << "data: " << LLSDNotationStreamer(message) << LL_ENDL;	   
+	LL_DEBUGS("Messaging") << "< \"" << msg_name << "\"" << LL_ENDL;
+	LL_DEBUGS("Messaging") << "context: " << context << LL_ENDL;
+	LL_DEBUGS("Messaging") << "message: " << message << LL_ENDL;	   
 
 	handler->post(responsep, context, message);
 }
@@ -3268,6 +3268,8 @@ void null_message_callback(LLMessageSystem *msg, void **data)
 // up, and then sending auth messages.
 void LLMessageSystem::establishBidirectionalTrust(const LLHost &host, S64 frame_count )
 {
+	LockMessageChecker lmc(this);
+
 	std::string shared_secret = get_shared_secret();
 	if(shared_secret.empty())
 	{
@@ -3287,7 +3289,7 @@ void LLMessageSystem::establishBidirectionalTrust(const LLHost &host, S64 frame_
 		addU8Fast(_PREHASH_PingID, 0);
 		addU32Fast(_PREHASH_OldestUnacked, 0);
 		sendMessage(host);
-		if (checkMessages( frame_count ))
+		if (lmc.checkMessages( frame_count ))
 		{
 			if (isMessageFast(_PREHASH_CompletePingCheck) &&
 			    (getSender() == host))
@@ -3295,7 +3297,7 @@ void LLMessageSystem::establishBidirectionalTrust(const LLHost &host, S64 frame_
 				break;
 			}
 		}
-		processAcks();
+		lmc.processAcks();
 		ms_sleep(1);
 	}
 
@@ -3314,8 +3316,8 @@ void LLMessageSystem::establishBidirectionalTrust(const LLHost &host, S64 frame_
 		cdp = mCircuitInfo.findCircuit(host);
 		if(!cdp) break; // no circuit anymore, no point continuing.
 		if(cdp->getTrusted()) break; // circuit is trusted.
-		checkMessages(frame_count);
-		processAcks();
+		lmc.checkMessages(frame_count);
+		lmc.processAcks();
 		ms_sleep(1);
 	}
 }
@@ -3973,11 +3975,18 @@ void LLMessageSystem::setTimeDecodesSpamThreshold( F32 seconds )
 	LLMessageReader::setTimeDecodesSpamThreshold(seconds);
 }
 
+LockMessageChecker::LockMessageChecker(LLMessageSystem* msgsystem):
+    // for the lifespan of this LockMessageChecker instance, use
+    // LLTemplateMessageReader as msgsystem's mMessageReader
+    LockMessageReader(msgsystem->mMessageReader, msgsystem->mTemplateMessageReader),
+    mMessageSystem(msgsystem)
+{}
+
 // HACK! babbage: return true if message rxed via either UDP or HTTP
 // TODO: babbage: move gServicePump in to LLMessageSystem?
-bool LLMessageSystem::checkAllMessages(S64 frame_count, LLPumpIO* http_pump)
+bool LLMessageSystem::checkAllMessages(LockMessageChecker& lmc, S64 frame_count, LLPumpIO* http_pump)
 {
-	if(checkMessages(frame_count))
+	if(lmc.checkMessages(frame_count))
 	{
 		return true;
 	}
diff --git a/indra/llmessage/message.h b/indra/llmessage/message.h
index 0af5a1b96d..52dbf871db 100644
--- a/indra/llmessage/message.h
+++ b/indra/llmessage/message.h
@@ -61,6 +61,8 @@
 #include "llstoredmessage.h"
 #include "boost/function.hpp"
 #include "llpounceable.h"
+#include "llcoros.h"
+#include LLCOROS_MUTEX_HEADER
 
 const U32 MESSAGE_MAX_STRINGS_LENGTH = 64;
 const U32 MESSAGE_NUMBER_OF_HASH_BUCKETS = 8192;
@@ -199,6 +201,91 @@ public:
 	virtual void complete(const LLHost& host, const LLUUID& agent) const = 0;
 };
 
+/**
+ * SL-12204: We've observed crashes when consumer code sets
+ * LLMessageSystem::mMessageReader, assuming that all subsequent processing of
+ * the current message will use the same mMessageReader value -- only to have
+ * a different coroutine sneak in and replace mMessageReader before
+ * completion. This is a limitation of sharing a stateful global resource for
+ * message parsing; instead code receiving a new message should instantiate a
+ * (trivially constructed) local message parser and use that.
+ *
+ * Until then, when one coroutine sets a particular LLMessageReader subclass
+ * as the current message reader, ensure that no other coroutine can replace
+ * it until the first coroutine has finished with its message.
+ *
+ * This is achieved with two helper classes. LLMessageSystem::mMessageReader
+ * is now an LLMessageReaderPointer instance, which can efficiently compare or
+ * dereference its contained LLMessageReader* but which cannot be directly
+ * assigned. To change the value of LLMessageReaderPointer, you must
+ * instantiate LockMessageReader with the LLMessageReader* you wish to make
+ * current. mMessageReader will have that value for the lifetime of the
+ * LockMessageReader instance, then revert to nullptr. Moreover, as its name
+ * implies, LockMessageReader locks the mutex in LLMessageReaderPointer so
+ * that any other coroutine instantiating LockMessageReader will block until
+ * the first coroutine has destroyed its instance.
+ */
+class LLMessageReaderPointer
+{
+public:
+    LLMessageReaderPointer(): mPtr(nullptr) {}
+    // It is essential that comparison and dereferencing must be fast, which
+    // is why we don't check for nullptr when dereferencing.
+    LLMessageReader* operator->() const { return mPtr; }
+    bool operator==(const LLMessageReader* other) const { return mPtr == other; }
+    bool operator!=(const LLMessageReader* other) const { return ! (*this == other); }
+private:
+    // Only LockMessageReader can set mPtr.
+    friend class LockMessageReader;
+    LLMessageReader* mPtr;
+    LLCoros::Mutex mMutex;
+};
+
+/**
+ * To set mMessageReader to nullptr:
+ *
+ * @code
+ * // use an anonymous instance that is destroyed immediately
+ * LockMessageReader(gMessageSystem->mMessageReader, nullptr);
+ * @endcode
+ *
+ * Why do we still require going through LockMessageReader at all? Because it
+ * would be Bad if any coroutine set mMessageReader to nullptr while another
+ * coroutine was still parsing a message.
+ */
+class LockMessageReader
+{
+public:
+    LockMessageReader(LLMessageReaderPointer& var, LLMessageReader* instance):
+        mVar(var.mPtr),
+        mLock(var.mMutex)
+    {
+        mVar = instance;
+    }
+    // Some compilers reportedly fail to suppress generating implicit copy
+    // operations even though we have a move-only LockType data member.
+    LockMessageReader(const LockMessageReader&) = delete;
+    LockMessageReader& operator=(const LockMessageReader&) = delete;
+    ~LockMessageReader()
+    {
+        mVar = nullptr;
+    }
+private:
+    // capture a reference to LLMessageReaderPointer::mPtr
+    decltype(LLMessageReaderPointer::mPtr)& mVar;
+    // while holding a lock on LLMessageReaderPointer::mMutex
+    LLCoros::LockType mLock;
+};
+
+/**
+ * LockMessageReader is great as long as you only need mMessageReader locked
+ * during a single LLMessageSystem function call. However, empirically the
+ * sequence from checkAllMessages() through processAcks() need mMessageReader
+ * locked to LLTemplateMessageReader. Enforce that by making them require an
+ * instance of LockMessageChecker.
+ */
+class LockMessageChecker;
+
 class LLMessageSystem : public LLMessageSenderInterface
 {
  private:
@@ -331,8 +418,8 @@ public:
 	bool addCircuitCode(U32 code, const LLUUID& session_id);
 
 	BOOL	poll(F32 seconds); // Number of seconds that we want to block waiting for data, returns if data was received
-	BOOL	checkMessages( S64 frame_count = 0 );
-	void	processAcks(F32 collect_time = 0.f);
+	BOOL	checkMessages(LockMessageChecker&, S64 frame_count = 0 );
+	void	processAcks(LockMessageChecker&, F32 collect_time = 0.f);
 
 	BOOL	isMessageFast(const char *msg);
 	BOOL	isMessage(const char *msg)
@@ -730,7 +817,7 @@ public:
 		const LLSD& data);
 
 	// Check UDP messages and pump http_pump to receive HTTP messages.
-	bool checkAllMessages(S64 frame_count, LLPumpIO* http_pump);
+	bool checkAllMessages(LockMessageChecker&, S64 frame_count, LLPumpIO* http_pump);
 
 	// Moved to allow access from LLTemplateMessageDispatcher
 	void clearReceiveState();
@@ -817,12 +904,13 @@ private:
 	LLMessageBuilder* mMessageBuilder;
 	LLTemplateMessageBuilder* mTemplateMessageBuilder;
 	LLSDMessageBuilder* mLLSDMessageBuilder;
-	LLMessageReader* mMessageReader;
+	LLMessageReaderPointer mMessageReader;
 	LLTemplateMessageReader* mTemplateMessageReader;
 	LLSDMessageReader* mLLSDMessageReader;
 
 	friend class LLMessageHandlerBridge;
-	
+	friend class LockMessageChecker;
+
 	bool callHandler(const char *name, bool trustedSource,
 					 LLMessageSystem* msg);
 
@@ -835,6 +923,40 @@ private:
 // external hook into messaging system
 extern LLPounceable<LLMessageSystem*, LLPounceableStatic> gMessageSystem;
 
+// Implementation of LockMessageChecker depends on definition of
+// LLMessageSystem, hence must follow it.
+class LockMessageChecker: public LockMessageReader
+{
+public:
+    LockMessageChecker(LLMessageSystem* msgsystem);
+
+    // For convenience, provide forwarding wrappers so you can call (e.g.)
+    // checkAllMessages() on your LockMessageChecker instance instead of
+    // passing the instance to LLMessageSystem::checkAllMessages(). Use
+    // perfect forwarding to avoid having to maintain these wrappers in sync
+    // with the target methods.
+    template <typename... ARGS>
+    bool checkAllMessages(ARGS&&... args)
+    {
+        return mMessageSystem->checkAllMessages(*this, std::forward<ARGS>(args)...);
+    }
+
+    template <typename... ARGS>
+    bool checkMessages(ARGS&&... args)
+    {
+        return mMessageSystem->checkMessages(*this, std::forward<ARGS>(args)...);
+    }
+
+    template <typename... ARGS>
+    void processAcks(ARGS&&... args)
+    {
+        return mMessageSystem->processAcks(*this, std::forward<ARGS>(args)...);
+    }
+
+private:
+    LLMessageSystem* mMessageSystem;
+};
+
 // Must specific overall system version, which is used to determine
 // if a patch is available in the message template checksum verification.
 // Return true if able to initialize system.
diff --git a/indra/llmessage/tests/llcoproceduremanager_test.cpp b/indra/llmessage/tests/llcoproceduremanager_test.cpp
new file mode 100644
index 0000000000..9db13a37b5
--- /dev/null
+++ b/indra/llmessage/tests/llcoproceduremanager_test.cpp
@@ -0,0 +1,178 @@
+/** 
+ * @file llcoproceduremanager_test.cpp
+ * @author Brad
+ * @date 2019-02
+ * @brief LLCoprocedureManager unit test
+ *
+ * $LicenseInfo:firstyear=2019&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "llwin32headers.h"
+
+#include "linden_common.h"
+#include "llsdserialize.h"
+
+#include "../llcoproceduremanager.h"
+
+#include <functional>
+
+#include <boost/fiber/fiber.hpp>
+#include <boost/fiber/buffered_channel.hpp>
+#include <boost/fiber/unbuffered_channel.hpp>
+
+#include "../test/lltut.h"
+#include "../test/sync.h"
+
+
+#if LL_WINDOWS
+// disable unreachable code warnings
+#pragma warning(disable: 4702)
+#endif
+
+LLCoreHttpUtil::HttpCoroutineAdapter::HttpCoroutineAdapter(std::string const&, unsigned int, unsigned int)
+{
+}
+
+void LLCoreHttpUtil::HttpCoroutineAdapter::cancelSuspendedOperation()
+{
+}
+
+LLCoreHttpUtil::HttpCoroutineAdapter::~HttpCoroutineAdapter()
+{
+}
+
+LLCore::HttpRequest::HttpRequest()
+{
+}
+
+LLCore::HttpRequest::~HttpRequest()
+{
+}
+
+namespace tut
+{
+    struct coproceduremanager_test
+    {
+        coproceduremanager_test()
+        {
+        }
+
+        ~coproceduremanager_test()
+        {
+            LLCoprocedureManager::instance().close();
+        }
+    };
+    typedef test_group<coproceduremanager_test> coproceduremanager_t;
+    typedef coproceduremanager_t::object coproceduremanager_object_t;
+    tut::coproceduremanager_t tut_coproceduremanager("LLCoprocedureManager");
+
+
+    template<> template<>
+    void coproceduremanager_object_t::test<1>()
+    {
+        Sync sync;
+        int foo = 0;
+        LLUUID queueId = LLCoprocedureManager::instance().enqueueCoprocedure("PoolName", "ProcName",
+            [&foo, &sync] (LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t & ptr, const LLUUID & id) {
+                sync.bump();
+                foo = 1;
+            });
+
+        sync.yield();
+        ensure_equals("coprocedure failed to update foo", foo, 1);
+        
+        LLCoprocedureManager::instance().close("PoolName");
+    }
+
+    template<> template<>
+    void coproceduremanager_object_t::test<2>()
+    {
+        const size_t capacity = 2;
+        boost::fibers::buffered_channel<std::function<void(void)>> chan(capacity);
+
+        boost::fibers::fiber worker([&chan]() {
+            chan.value_pop()();
+        });
+
+        chan.push([]() {
+            LL_INFOS("Test") << "test 1" << LL_ENDL;
+        });
+
+        worker.join();
+    }
+
+    template<> template<>
+    void coproceduremanager_object_t::test<3>()
+    {
+        boost::fibers::unbuffered_channel<std::function<void(void)>> chan;
+
+        boost::fibers::fiber worker([&chan]() {
+            chan.value_pop()();
+        });
+
+        chan.push([]() {
+            LL_INFOS("Test") << "test 1" << LL_ENDL;
+        });
+
+        worker.join();
+    }
+
+    template<> template<>
+    void coproceduremanager_object_t::test<4>()
+    {
+        boost::fibers::buffered_channel<std::function<void(void)>> chan(4);
+
+        boost::fibers::fiber worker([&chan]() {
+            std::function<void(void)> f;
+
+            // using namespace std::chrono_literals;
+            // const auto timeout = 5s;
+            // boost::fibers::channel_op_status status;
+            while (chan.pop(f) != boost::fibers::channel_op_status::closed)
+            {
+                LL_INFOS("CoWorker") << "got coproc" << LL_ENDL;
+                f();
+            }
+            LL_INFOS("CoWorker") << "got closed" << LL_ENDL;
+        });
+
+        int counter = 0;
+
+        for (int i = 0; i < 5; ++i)
+        {
+            LL_INFOS("CoMain") << "pushing coproc " << i << LL_ENDL;
+            chan.push([&counter]() {
+                LL_INFOS("CoProc") << "in coproc" << LL_ENDL;
+                ++counter;
+            });
+        }
+
+        LL_INFOS("CoMain") << "closing channel" << LL_ENDL;
+        chan.close();
+
+        LL_INFOS("CoMain") << "joining worker" << LL_ENDL;
+        worker.join();
+
+        LL_INFOS("CoMain") << "checking count" << LL_ENDL;
+        ensure_equals("coprocedure failed to update counter", counter, 5);
+    }
+}  // namespace tut