Add m-esr52 at 52.6.0

1 files changed, 1627 insertions, 0 deletions

diff --git a/netwerk/base/nsSocketTransportService2.cpp b/netwerk/base/nsSocketTransportService2.cpp
new file mode 100644
index 000000000..d2f20651e
--- /dev/null
+++ b/netwerk/base/nsSocketTransportService2.cpp
@@ -0,0 +1,1627 @@
+// vim:set sw=4 sts=4 et cin:
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsSocketTransportService2.h"
+#include "nsSocketTransport2.h"
+#include "NetworkActivityMonitor.h"
+#include "mozilla/Preferences.h"
+#include "nsIOService.h"
+#include "nsASocketHandler.h"
+#include "nsError.h"
+#include "prnetdb.h"
+#include "prerror.h"
+#include "nsIPrefService.h"
+#include "nsIPrefBranch.h"
+#include "nsServiceManagerUtils.h"
+#include "nsIObserverService.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/Services.h"
+#include "mozilla/Likely.h"
+#include "mozilla/PublicSSL.h"
+#include "mozilla/ChaosMode.h"
+#include "mozilla/PodOperations.h"
+#include "mozilla/Telemetry.h"
+#include "nsThreadUtils.h"
+#include "nsIFile.h"
+#include "nsIWidget.h"
+#include "mozilla/dom/FlyWebService.h"
+
+#if defined(XP_WIN)
+#include "mozilla/WindowsVersion.h"
+#endif
+
+namespace mozilla {
+namespace net {
+
+LazyLogModule gSocketTransportLog("nsSocketTransport");
+LazyLogModule gUDPSocketLog("UDPSocket");
+LazyLogModule gTCPSocketLog("TCPSocket");
+
+nsSocketTransportService *gSocketTransportService = nullptr;
+Atomic<PRThread*, Relaxed> gSocketThread;
+
+#define SEND_BUFFER_PREF "network.tcp.sendbuffer"
+#define KEEPALIVE_ENABLED_PREF "network.tcp.keepalive.enabled"
+#define KEEPALIVE_IDLE_TIME_PREF "network.tcp.keepalive.idle_time"
+#define KEEPALIVE_RETRY_INTERVAL_PREF "network.tcp.keepalive.retry_interval"
+#define KEEPALIVE_PROBE_COUNT_PREF "network.tcp.keepalive.probe_count"
+#define SOCKET_LIMIT_TARGET 1000U
+#define SOCKET_LIMIT_MIN      50U
+#define BLIP_INTERVAL_PREF "network.activity.blipIntervalMilliseconds"
+#define MAX_TIME_BETWEEN_TWO_POLLS "network.sts.max_time_for_events_between_two_polls"
+#define TELEMETRY_PREF "toolkit.telemetry.enabled"
+#define MAX_TIME_FOR_PR_CLOSE_DURING_SHUTDOWN "network.sts.max_time_for_pr_close_during_shutdown"
+
+#define REPAIR_POLLABLE_EVENT_TIME 10
+
+uint32_t nsSocketTransportService::gMaxCount;
+PRCallOnceType nsSocketTransportService::gMaxCountInitOnce;
+
+//-----------------------------------------------------------------------------
+// ctor/dtor (called on the main/UI thread by the service manager)
+
+nsSocketTransportService::nsSocketTransportService()
+    : mThread(nullptr)
+    , mLock("nsSocketTransportService::mLock")
+    , mInitialized(false)
+    , mShuttingDown(false)
+    , mOffline(false)
+    , mGoingOffline(false)
+    , mRawThread(nullptr)
+    , mActiveListSize(SOCKET_LIMIT_MIN)
+    , mIdleListSize(SOCKET_LIMIT_MIN)
+    , mActiveCount(0)
+    , mIdleCount(0)
+    , mSentBytesCount(0)
+    , mReceivedBytesCount(0)
+    , mSendBufferSize(0)
+    , mKeepaliveIdleTimeS(600)
+    , mKeepaliveRetryIntervalS(1)
+    , mKeepaliveProbeCount(kDefaultTCPKeepCount)
+    , mKeepaliveEnabledPref(false)
+    , mServingPendingQueue(false)
+    , mMaxTimePerPollIter(100)
+    , mTelemetryEnabledPref(false)
+    , mMaxTimeForPrClosePref(PR_SecondsToInterval(5))
+    , mSleepPhase(false)
+    , mProbedMaxCount(false)
+#if defined(XP_WIN)
+    , mPolling(false)
+#endif
+{
+    NS_ASSERTION(NS_IsMainThread(), "wrong thread");
+
+    PR_CallOnce(&gMaxCountInitOnce, DiscoverMaxCount);
+    mActiveList = (SocketContext *)
+        moz_xmalloc(sizeof(SocketContext) * mActiveListSize);
+    mIdleList = (SocketContext *)
+        moz_xmalloc(sizeof(SocketContext) * mIdleListSize);
+    mPollList = (PRPollDesc *)
+        moz_xmalloc(sizeof(PRPollDesc) * (mActiveListSize + 1));
+
+    NS_ASSERTION(!gSocketTransportService, "must not instantiate twice");
+    gSocketTransportService = this;
+}
+
+nsSocketTransportService::~nsSocketTransportService()
+{
+    NS_ASSERTION(NS_IsMainThread(), "wrong thread");
+    NS_ASSERTION(!mInitialized, "not shutdown properly");
+
+    free(mActiveList);
+    free(mIdleList);
+    free(mPollList);
+    gSocketTransportService = nullptr;
+}
+
+//-----------------------------------------------------------------------------
+// event queue (any thread)
+
+already_AddRefed<nsIThread>
+nsSocketTransportService::GetThreadSafely()
+{
+    MutexAutoLock lock(mLock);
+    nsCOMPtr<nsIThread> result = mThread;
+    return result.forget();
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::DispatchFromScript(nsIRunnable *event, uint32_t flags)
+{
+  nsCOMPtr<nsIRunnable> event_ref(event);
+  return Dispatch(event_ref.forget(), flags);
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::Dispatch(already_AddRefed<nsIRunnable> event, uint32_t flags)
+{
+    nsCOMPtr<nsIRunnable> event_ref(event);
+    SOCKET_LOG(("STS dispatch [%p]\n", event_ref.get()));
+
+    nsCOMPtr<nsIThread> thread = GetThreadSafely();
+    nsresult rv;
+    rv = thread ? thread->Dispatch(event_ref.forget(), flags) : NS_ERROR_NOT_INITIALIZED;
+    if (rv == NS_ERROR_UNEXPECTED) {
+        // Thread is no longer accepting events. We must have just shut it
+        // down on the main thread. Pretend we never saw it.
+        rv = NS_ERROR_NOT_INITIALIZED;
+    }
+    return rv;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::DelayedDispatch(already_AddRefed<nsIRunnable>, uint32_t)
+{
+    return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::IsOnCurrentThread(bool *result)
+{
+    nsCOMPtr<nsIThread> thread = GetThreadSafely();
+    NS_ENSURE_TRUE(thread, NS_ERROR_NOT_INITIALIZED);
+    return thread->IsOnCurrentThread(result);
+}
+
+//-----------------------------------------------------------------------------
+// socket api (socket thread only)
+
+NS_IMETHODIMP
+nsSocketTransportService::NotifyWhenCanAttachSocket(nsIRunnable *event)
+{
+    SOCKET_LOG(("nsSocketTransportService::NotifyWhenCanAttachSocket\n"));
+
+    NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
+
+    if (CanAttachSocket()) {
+        return Dispatch(event, NS_DISPATCH_NORMAL);
+    }
+
+    auto *runnable = new LinkedRunnableEvent(event);
+    mPendingSocketQueue.insertBack(runnable);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::AttachSocket(PRFileDesc *fd, nsASocketHandler *handler)
+{
+    SOCKET_LOG(("nsSocketTransportService::AttachSocket [handler=%p]\n", handler));
+
+    NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
+
+    if (!CanAttachSocket()) {
+        return NS_ERROR_NOT_AVAILABLE;
+    }
+
+    SocketContext sock;
+    sock.mFD = fd;
+    sock.mHandler = handler;
+    sock.mElapsedTime = 0;
+
+    nsresult rv = AddToIdleList(&sock);
+    if (NS_SUCCEEDED(rv))
+        NS_ADDREF(handler);
+    return rv;
+}
+
+// the number of sockets that can be attached at any given time is
+// limited.  this is done because some operating systems (e.g., Win9x)
+// limit the number of sockets that can be created by an application.
+// AttachSocket will fail if the limit is exceeded.  consumers should
+// call CanAttachSocket and check the result before creating a socket.
+
+bool
+nsSocketTransportService::CanAttachSocket()
+{
+    static bool reported900FDLimit = false;
+
+    uint32_t total = mActiveCount + mIdleCount;
+    bool rv = total < gMaxCount;
+
+    if (mTelemetryEnabledPref &&
+        (((total >= 900) || !rv) && !reported900FDLimit)) {
+        reported900FDLimit = true;
+        Telemetry::Accumulate(Telemetry::NETWORK_SESSION_AT_900FD, true);
+    }
+
+    return rv;
+}
+
+nsresult
+nsSocketTransportService::DetachSocket(SocketContext *listHead, SocketContext *sock)
+{
+    SOCKET_LOG(("nsSocketTransportService::DetachSocket [handler=%p]\n", sock->mHandler));
+    MOZ_ASSERT((listHead == mActiveList) || (listHead == mIdleList),
+               "DetachSocket invalid head");
+
+    // inform the handler that this socket is going away
+    sock->mHandler->OnSocketDetached(sock->mFD);
+    mSentBytesCount += sock->mHandler->ByteCountSent();
+    mReceivedBytesCount += sock->mHandler->ByteCountReceived();
+
+    // cleanup
+    sock->mFD = nullptr;
+    NS_RELEASE(sock->mHandler);
+
+    if (listHead == mActiveList)
+        RemoveFromPollList(sock);
+    else
+        RemoveFromIdleList(sock);
+
+    // NOTE: sock is now an invalid pointer
+    
+    //
+    // notify the first element on the pending socket queue...
+    //
+    nsCOMPtr<nsIRunnable> event;
+    LinkedRunnableEvent *runnable = mPendingSocketQueue.getFirst();
+    if (runnable) {
+        event = runnable->TakeEvent();
+        runnable->remove();
+        delete runnable;
+    }
+    if (event) {
+        // move event from pending queue to dispatch queue
+        return Dispatch(event, NS_DISPATCH_NORMAL);
+    }
+    return NS_OK;
+}
+
+nsresult
+nsSocketTransportService::AddToPollList(SocketContext *sock)
+{
+    MOZ_ASSERT(!(static_cast<uint32_t>(sock - mActiveList) < mActiveListSize),
+               "AddToPollList Socket Already Active");
+
+    SOCKET_LOG(("nsSocketTransportService::AddToPollList [handler=%p]\n", sock->mHandler));
+    if (mActiveCount == mActiveListSize) {
+        SOCKET_LOG(("  Active List size of %d met\n", mActiveCount));
+        if (!GrowActiveList()) {
+            NS_ERROR("too many active sockets");
+            return NS_ERROR_OUT_OF_MEMORY;
+        }
+    }
+    
+    uint32_t newSocketIndex = mActiveCount;
+    if (ChaosMode::isActive(ChaosFeature::NetworkScheduling)) {
+      newSocketIndex = ChaosMode::randomUint32LessThan(mActiveCount + 1);
+      PodMove(mActiveList + newSocketIndex + 1, mActiveList + newSocketIndex,
+              mActiveCount - newSocketIndex);
+      PodMove(mPollList + newSocketIndex + 2, mPollList + newSocketIndex + 1,
+              mActiveCount - newSocketIndex);
+    }
+    mActiveList[newSocketIndex] = *sock;
+    mActiveCount++;
+
+    mPollList[newSocketIndex + 1].fd = sock->mFD;
+    mPollList[newSocketIndex + 1].in_flags = sock->mHandler->mPollFlags;
+    mPollList[newSocketIndex + 1].out_flags = 0;
+
+    SOCKET_LOG(("  active=%u idle=%u\n", mActiveCount, mIdleCount));
+    return NS_OK;
+}
+
+void
+nsSocketTransportService::RemoveFromPollList(SocketContext *sock)
+{
+    SOCKET_LOG(("nsSocketTransportService::RemoveFromPollList [handler=%p]\n", sock->mHandler));
+
+    uint32_t index = sock - mActiveList;
+    MOZ_ASSERT(index < mActiveListSize, "invalid index");
+
+    SOCKET_LOG(("  index=%u mActiveCount=%u\n", index, mActiveCount));
+
+    if (index != mActiveCount-1) {
+        mActiveList[index] = mActiveList[mActiveCount-1];
+        mPollList[index+1] = mPollList[mActiveCount];
+    }
+    mActiveCount--;
+
+    SOCKET_LOG(("  active=%u idle=%u\n", mActiveCount, mIdleCount));
+}
+
+nsresult
+nsSocketTransportService::AddToIdleList(SocketContext *sock)
+{
+    MOZ_ASSERT(!(static_cast<uint32_t>(sock - mIdleList) < mIdleListSize),
+               "AddToIdlelList Socket Already Idle");
+
+    SOCKET_LOG(("nsSocketTransportService::AddToIdleList [handler=%p]\n", sock->mHandler));
+    if (mIdleCount == mIdleListSize) {
+        SOCKET_LOG(("  Idle List size of %d met\n", mIdleCount));
+        if (!GrowIdleList()) {
+            NS_ERROR("too many idle sockets");
+            return NS_ERROR_OUT_OF_MEMORY;
+        }
+    }
+
+    mIdleList[mIdleCount] = *sock;
+    mIdleCount++;
+
+    SOCKET_LOG(("  active=%u idle=%u\n", mActiveCount, mIdleCount));
+    return NS_OK;
+}
+
+void
+nsSocketTransportService::RemoveFromIdleList(SocketContext *sock)
+{
+    SOCKET_LOG(("nsSocketTransportService::RemoveFromIdleList [handler=%p]\n", sock->mHandler));
+
+    uint32_t index = sock - mIdleList;
+    NS_ASSERTION(index < mIdleListSize, "invalid index in idle list");
+
+    if (index != mIdleCount-1)
+        mIdleList[index] = mIdleList[mIdleCount-1];
+    mIdleCount--;
+
+    SOCKET_LOG(("  active=%u idle=%u\n", mActiveCount, mIdleCount));
+}
+
+void
+nsSocketTransportService::MoveToIdleList(SocketContext *sock)
+{
+    nsresult rv = AddToIdleList(sock);
+    if (NS_FAILED(rv))
+        DetachSocket(mActiveList, sock);
+    else
+        RemoveFromPollList(sock);
+}
+
+void
+nsSocketTransportService::MoveToPollList(SocketContext *sock)
+{
+    nsresult rv = AddToPollList(sock);
+    if (NS_FAILED(rv))
+        DetachSocket(mIdleList, sock);
+    else
+        RemoveFromIdleList(sock);
+}
+
+bool
+nsSocketTransportService::GrowActiveList()
+{
+    int32_t toAdd = gMaxCount - mActiveListSize;
+    if (toAdd > 100) {
+        toAdd = 100;
+    } else if (toAdd < 1) {
+        MOZ_ASSERT(false, "CanAttachSocket() should prevent this");
+        return false;
+    }
+
+    mActiveListSize += toAdd;
+    mActiveList = (SocketContext *)
+        moz_xrealloc(mActiveList, sizeof(SocketContext) * mActiveListSize);
+    mPollList = (PRPollDesc *)
+        moz_xrealloc(mPollList, sizeof(PRPollDesc) * (mActiveListSize + 1));
+    return true;
+}
+
+bool
+nsSocketTransportService::GrowIdleList()
+{
+    int32_t toAdd = gMaxCount - mIdleListSize;
+    if (toAdd > 100) {
+        toAdd = 100;
+    } else if (toAdd < 1) {
+        MOZ_ASSERT(false, "CanAttachSocket() should prevent this");
+        return false;
+    }
+
+    mIdleListSize += toAdd;
+    mIdleList = (SocketContext *)
+        moz_xrealloc(mIdleList, sizeof(SocketContext) * mIdleListSize);
+    return true;
+}
+
+PRIntervalTime
+nsSocketTransportService::PollTimeout()
+{
+    if (mActiveCount == 0)
+        return NS_SOCKET_POLL_TIMEOUT;
+
+    // compute minimum time before any socket timeout expires.
+    uint32_t minR = UINT16_MAX;
+    for (uint32_t i=0; i<mActiveCount; ++i) {
+        const SocketContext &s = mActiveList[i];
+        // mPollTimeout could be less than mElapsedTime if setTimeout
+        // was called with a value smaller than mElapsedTime.
+        uint32_t r = (s.mElapsedTime < s.mHandler->mPollTimeout)
+          ? s.mHandler->mPollTimeout - s.mElapsedTime
+          : 0;
+        if (r < minR)
+            minR = r;
+    }
+    // nsASocketHandler defines UINT16_MAX as do not timeout
+    if (minR == UINT16_MAX) {
+        SOCKET_LOG(("poll timeout: none\n"));
+        return NS_SOCKET_POLL_TIMEOUT;
+    }
+    SOCKET_LOG(("poll timeout: %lu\n", minR));
+    return PR_SecondsToInterval(minR);
+}
+
+int32_t
+nsSocketTransportService::Poll(uint32_t *interval,
+                               TimeDuration *pollDuration)
+{
+    PRPollDesc *pollList;
+    uint32_t pollCount;
+    PRIntervalTime pollTimeout;
+    *pollDuration = 0;
+
+    // If there are pending events for this thread then
+    // DoPollIteration() should service the network without blocking.
+    bool pendingEvents = false;
+    mRawThread->HasPendingEvents(&pendingEvents);
+
+    if (mPollList[0].fd) {
+        mPollList[0].out_flags = 0;
+        pollList = mPollList;
+        pollCount = mActiveCount + 1;
+        pollTimeout = pendingEvents ? PR_INTERVAL_NO_WAIT : PollTimeout();
+    }
+    else {
+        // no pollable event, so busy wait...
+        pollCount = mActiveCount;
+        if (pollCount)
+            pollList = &mPollList[1];
+        else
+            pollList = nullptr;
+        pollTimeout =
+            pendingEvents ? PR_INTERVAL_NO_WAIT : PR_MillisecondsToInterval(25);
+    }
+
+    PRIntervalTime ts = PR_IntervalNow();
+
+    TimeStamp pollStart;
+    if (mTelemetryEnabledPref) {
+        pollStart = TimeStamp::NowLoRes();
+    }
+
+    SOCKET_LOG(("    timeout = %i milliseconds\n",
+         PR_IntervalToMilliseconds(pollTimeout)));
+    int32_t rv = PR_Poll(pollList, pollCount, pollTimeout);
+
+    PRIntervalTime passedInterval = PR_IntervalNow() - ts;
+
+    if (mTelemetryEnabledPref && !pollStart.IsNull()) {
+        *pollDuration = TimeStamp::NowLoRes() - pollStart;
+    }
+
+    SOCKET_LOG(("    ...returned after %i milliseconds\n",
+         PR_IntervalToMilliseconds(passedInterval))); 
+
+    *interval = PR_IntervalToSeconds(passedInterval);
+    return rv;
+}
+
+//-----------------------------------------------------------------------------
+// xpcom api
+
+NS_IMPL_ISUPPORTS(nsSocketTransportService,
+                  nsISocketTransportService,
+                  nsIRoutedSocketTransportService,
+                  nsIEventTarget,
+                  nsIThreadObserver,
+                  nsIRunnable,
+                  nsPISocketTransportService,
+                  nsIObserver)
+
+// called from main thread only
+NS_IMETHODIMP
+nsSocketTransportService::Init()
+{
+    if (!NS_IsMainThread()) {
+        NS_ERROR("wrong thread");
+        return NS_ERROR_UNEXPECTED;
+    }
+
+    if (mInitialized)
+        return NS_OK;
+
+    if (mShuttingDown)
+        return NS_ERROR_UNEXPECTED;
+
+    nsCOMPtr<nsIThread> thread;
+    nsresult rv = NS_NewNamedThread("Socket Thread", getter_AddRefs(thread), this);
+    if (NS_FAILED(rv)) return rv;
+    
+    {
+        MutexAutoLock lock(mLock);
+        // Install our mThread, protecting against concurrent readers
+        thread.swap(mThread);
+    }
+
+    nsCOMPtr<nsIPrefBranch> tmpPrefService = do_GetService(NS_PREFSERVICE_CONTRACTID);
+    if (tmpPrefService) {
+        tmpPrefService->AddObserver(SEND_BUFFER_PREF, this, false);
+        tmpPrefService->AddObserver(KEEPALIVE_ENABLED_PREF, this, false);
+        tmpPrefService->AddObserver(KEEPALIVE_IDLE_TIME_PREF, this, false);
+        tmpPrefService->AddObserver(KEEPALIVE_RETRY_INTERVAL_PREF, this, false);
+        tmpPrefService->AddObserver(KEEPALIVE_PROBE_COUNT_PREF, this, false);
+        tmpPrefService->AddObserver(MAX_TIME_BETWEEN_TWO_POLLS, this, false);
+        tmpPrefService->AddObserver(TELEMETRY_PREF, this, false);
+        tmpPrefService->AddObserver(MAX_TIME_FOR_PR_CLOSE_DURING_SHUTDOWN, this, false);
+    }
+    UpdatePrefs();
+
+    nsCOMPtr<nsIObserverService> obsSvc = services::GetObserverService();
+    if (obsSvc) {
+        obsSvc->AddObserver(this, "profile-initial-state", false);
+        obsSvc->AddObserver(this, "last-pb-context-exited", false);
+        obsSvc->AddObserver(this, NS_WIDGET_SLEEP_OBSERVER_TOPIC, true);
+        obsSvc->AddObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC, true);
+        obsSvc->AddObserver(this, "xpcom-shutdown-threads", false);
+    }
+
+    mInitialized = true;
+    return NS_OK;
+}
+
+// called from main thread only
+NS_IMETHODIMP
+nsSocketTransportService::Shutdown(bool aXpcomShutdown)
+{
+    SOCKET_LOG(("nsSocketTransportService::Shutdown\n"));
+
+    NS_ENSURE_STATE(NS_IsMainThread());
+
+    if (!mInitialized)
+        return NS_OK;
+
+    if (mShuttingDown)
+        return NS_ERROR_UNEXPECTED;
+
+    {
+        MutexAutoLock lock(mLock);
+
+        // signal the socket thread to shutdown
+        mShuttingDown = true;
+
+        if (mPollableEvent) {
+            mPollableEvent->Signal();
+        }
+    }
+
+    if (!aXpcomShutdown) {
+        return ShutdownThread();
+    }
+
+    return NS_OK;
+}
+
+nsresult
+nsSocketTransportService::ShutdownThread()
+{
+    SOCKET_LOG(("nsSocketTransportService::ShutdownThread\n"));
+
+    NS_ENSURE_STATE(NS_IsMainThread());
+
+    if (!mInitialized || !mShuttingDown)
+        return NS_OK;
+
+    // join with thread
+    mThread->Shutdown();
+    {
+        MutexAutoLock lock(mLock);
+        // Drop our reference to mThread and make sure that any concurrent
+        // readers are excluded
+        mThread = nullptr;
+    }
+
+    nsCOMPtr<nsIPrefBranch> tmpPrefService = do_GetService(NS_PREFSERVICE_CONTRACTID);
+    if (tmpPrefService) 
+        tmpPrefService->RemoveObserver(SEND_BUFFER_PREF, this);
+
+    nsCOMPtr<nsIObserverService> obsSvc = services::GetObserverService();
+    if (obsSvc) {
+        obsSvc->RemoveObserver(this, "profile-initial-state");
+        obsSvc->RemoveObserver(this, "last-pb-context-exited");
+        obsSvc->RemoveObserver(this, NS_WIDGET_SLEEP_OBSERVER_TOPIC);
+        obsSvc->RemoveObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC);
+        obsSvc->RemoveObserver(this, "xpcom-shutdown-threads");
+    }
+
+    if (mAfterWakeUpTimer) {
+        mAfterWakeUpTimer->Cancel();
+        mAfterWakeUpTimer = nullptr;
+    }
+
+    NetworkActivityMonitor::Shutdown();
+
+    mInitialized = false;
+    mShuttingDown = false;
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::GetOffline(bool *offline)
+{
+    *offline = mOffline;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::SetOffline(bool offline)
+{
+    MutexAutoLock lock(mLock);
+    if (!mOffline && offline) {
+        // signal the socket thread to go offline, so it will detach sockets
+        mGoingOffline = true;
+        mOffline = true;
+    }
+    else if (mOffline && !offline) {
+        mOffline = false;
+    }
+    if (mPollableEvent) {
+        mPollableEvent->Signal();
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::GetKeepaliveIdleTime(int32_t *aKeepaliveIdleTimeS)
+{
+    MOZ_ASSERT(aKeepaliveIdleTimeS);
+    if (NS_WARN_IF(!aKeepaliveIdleTimeS)) {
+        return NS_ERROR_NULL_POINTER;
+    }
+    *aKeepaliveIdleTimeS = mKeepaliveIdleTimeS;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::GetKeepaliveRetryInterval(int32_t *aKeepaliveRetryIntervalS)
+{
+    MOZ_ASSERT(aKeepaliveRetryIntervalS);
+    if (NS_WARN_IF(!aKeepaliveRetryIntervalS)) {
+        return NS_ERROR_NULL_POINTER;
+    }
+    *aKeepaliveRetryIntervalS = mKeepaliveRetryIntervalS;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::GetKeepaliveProbeCount(int32_t *aKeepaliveProbeCount)
+{
+    MOZ_ASSERT(aKeepaliveProbeCount);
+    if (NS_WARN_IF(!aKeepaliveProbeCount)) {
+        return NS_ERROR_NULL_POINTER;
+    }
+    *aKeepaliveProbeCount = mKeepaliveProbeCount;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::CreateTransport(const char **types,
+                                          uint32_t typeCount,
+                                          const nsACString &host,
+                                          int32_t port,
+                                          nsIProxyInfo *proxyInfo,
+                                          nsISocketTransport **result)
+{
+    return CreateRoutedTransport(types, typeCount, host, port, NS_LITERAL_CSTRING(""), 0,
+                                 proxyInfo, result);
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::CreateRoutedTransport(const char **types,
+                                                uint32_t typeCount,
+                                                const nsACString &host,
+                                                int32_t port,
+                                                const nsACString &hostRoute,
+                                                int32_t portRoute,
+                                                nsIProxyInfo *proxyInfo,
+                                                nsISocketTransport **result)
+{
+    // Check FlyWeb table for host mappings.  If one exists, then use that.
+    RefPtr<mozilla::dom::FlyWebService> fws =
+        mozilla::dom::FlyWebService::GetExisting();
+    if (fws) {
+        nsresult rv = fws->CreateTransportForHost(types, typeCount, host, port,
+                                                  hostRoute, portRoute,
+                                                  proxyInfo, result);
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        if (*result) {
+            return NS_OK;
+        }
+    }
+
+    NS_ENSURE_TRUE(mInitialized, NS_ERROR_NOT_INITIALIZED);
+    NS_ENSURE_TRUE(port >= 0 && port <= 0xFFFF, NS_ERROR_ILLEGAL_VALUE);
+
+    RefPtr<nsSocketTransport> trans = new nsSocketTransport();
+    nsresult rv = trans->Init(types, typeCount, host, port, hostRoute, portRoute, proxyInfo);
+    if (NS_FAILED(rv)) {
+        return rv;
+    }
+
+    trans.forget(result);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::CreateUnixDomainTransport(nsIFile *aPath,
+                                                    nsISocketTransport **result)
+{
+    nsresult rv;
+
+    NS_ENSURE_TRUE(mInitialized, NS_ERROR_NOT_INITIALIZED);
+
+    nsAutoCString path;
+    rv = aPath->GetNativePath(path);
+    if (NS_FAILED(rv))
+        return rv;
+
+    RefPtr<nsSocketTransport> trans = new nsSocketTransport();
+
+    rv = trans->InitWithFilename(path.get());
+    if (NS_FAILED(rv))
+        return rv;
+
+    trans.forget(result);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::OnDispatchedEvent(nsIThreadInternal *thread)
+{
+#ifndef XP_WIN
+    // On windows poll can hang and this became worse when we introduced the
+    // patch for bug 698882 (see also bug 1292181), therefore we reverted the
+    // behavior on windows to be as before bug 698882, e.g. write to the socket
+    // also if an event dispatch is on the socket thread and writing to the
+    // socket for each event.
+    if (PR_GetCurrentThread() == gSocketThread) {
+        // this check is redundant to one done inside ::Signal(), but
+        // we can do it here and skip obtaining the lock - given that
+        // this is a relatively common occurance its worth the
+        // redundant code
+        SOCKET_LOG(("OnDispatchedEvent Same Thread Skip Signal\n"));
+        return NS_OK;
+    }
+#else
+    if (gIOService->IsNetTearingDown()) {
+        // Poll can hang sometimes. If we are in shutdown, we are going to
+        // start a watchdog. If we do not exit poll within
+        // REPAIR_POLLABLE_EVENT_TIME signal a pollable event again.
+        StartPollWatchdog();
+    }
+#endif
+
+    MutexAutoLock lock(mLock);
+    if (mPollableEvent) {
+        mPollableEvent->Signal();
+    }
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::OnProcessNextEvent(nsIThreadInternal *thread,
+                                             bool mayWait)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::AfterProcessNextEvent(nsIThreadInternal* thread,
+                                                bool eventWasProcessed)
+{
+    return NS_OK;
+}
+
+void
+nsSocketTransportService::MarkTheLastElementOfPendingQueue()
+{
+    mServingPendingQueue = false;
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::Run()
+{
+    SOCKET_LOG(("STS thread init %d sockets\n", gMaxCount));
+
+    psm::InitializeSSLServerCertVerificationThreads();
+
+    gSocketThread = PR_GetCurrentThread();
+
+    {
+        MutexAutoLock lock(mLock);
+        mPollableEvent.reset(new PollableEvent());
+        //
+        // NOTE: per bug 190000, this failure could be caused by Zone-Alarm
+        // or similar software.
+        //
+        // NOTE: per bug 191739, this failure could also be caused by lack
+        // of a loopback device on Windows and OS/2 platforms (it creates
+        // a loopback socket pair on these platforms to implement a pollable
+        // event object).  if we can't create a pollable event, then we'll
+        // have to "busy wait" to implement the socket event queue :-(
+        //
+        if (!mPollableEvent->Valid()) {
+            mPollableEvent = nullptr;
+            NS_WARNING("running socket transport thread without a pollable event");
+            SOCKET_LOG(("running socket transport thread without a pollable event"));
+        }
+
+        mPollList[0].fd = mPollableEvent ? mPollableEvent->PollableFD() : nullptr;
+        mPollList[0].in_flags = PR_POLL_READ | PR_POLL_EXCEPT;
+        mPollList[0].out_flags = 0;
+    }
+
+    mRawThread = NS_GetCurrentThread();
+
+    // hook ourselves up to observe event processing for this thread
+    nsCOMPtr<nsIThreadInternal> threadInt = do_QueryInterface(mRawThread);
+    threadInt->SetObserver(this);
+
+    // make sure the pseudo random number generator is seeded on this thread
+    srand(static_cast<unsigned>(PR_Now()));
+
+    // For the calculation of the duration of the last cycle (i.e. the last for-loop
+    // iteration before shutdown).
+    TimeStamp startOfCycleForLastCycleCalc;
+    int numberOfPendingEventsLastCycle;
+
+    // For measuring of the poll iteration duration without time spent blocked
+    // in poll().
+    TimeStamp pollCycleStart;
+    // Time blocked in poll().
+    TimeDuration singlePollDuration;
+
+    // For calculating the time needed for a new element to run.
+    TimeStamp startOfIteration;
+    TimeStamp startOfNextIteration;
+    int numberOfPendingEvents;
+
+    // If there is too many pending events queued, we will run some poll()
+    // between them and the following variable is cumulative time spent
+    // blocking in poll().
+    TimeDuration pollDuration;
+
+    for (;;) {
+        bool pendingEvents = false;
+
+        numberOfPendingEvents = 0;
+        numberOfPendingEventsLastCycle = 0;
+        if (mTelemetryEnabledPref) {
+            startOfCycleForLastCycleCalc = TimeStamp::NowLoRes();
+            startOfNextIteration = TimeStamp::NowLoRes();
+        }
+        pollDuration = 0;
+
+        do {
+            if (mTelemetryEnabledPref) {
+                pollCycleStart = TimeStamp::NowLoRes();
+            }
+
+            DoPollIteration(&singlePollDuration);
+
+            if (mTelemetryEnabledPref && !pollCycleStart.IsNull()) {
+                Telemetry::Accumulate(Telemetry::STS_POLL_BLOCK_TIME,
+                                      singlePollDuration.ToMilliseconds());
+                Telemetry::AccumulateTimeDelta(
+                    Telemetry::STS_POLL_CYCLE,
+                    pollCycleStart + singlePollDuration,
+                    TimeStamp::NowLoRes());
+                pollDuration += singlePollDuration;
+            }
+
+            mRawThread->HasPendingEvents(&pendingEvents);
+            if (pendingEvents) {
+                if (!mServingPendingQueue) {
+                    nsresult rv = Dispatch(NewRunnableMethod(this,
+                        &nsSocketTransportService::MarkTheLastElementOfPendingQueue),
+                        nsIEventTarget::DISPATCH_NORMAL);
+                    if (NS_FAILED(rv)) {
+                        NS_WARNING("Could not dispatch a new event on the "
+                                   "socket thread.");
+                    } else {
+                        mServingPendingQueue = true;
+                    }
+
+                    if (mTelemetryEnabledPref) {
+                        startOfIteration = startOfNextIteration;
+                        // Everything that comes after this point will
+                        // be served in the next iteration. If no even
+                        // arrives, startOfNextIteration will be reset at the
+                        // beginning of each for-loop.
+                        startOfNextIteration = TimeStamp::NowLoRes();
+                    }
+                }
+                TimeStamp eventQueueStart = TimeStamp::NowLoRes();
+                do {
+                    NS_ProcessNextEvent(mRawThread);
+                    numberOfPendingEvents++;
+                    pendingEvents = false;
+                    mRawThread->HasPendingEvents(&pendingEvents);
+                } while (pendingEvents && mServingPendingQueue &&
+                         ((TimeStamp::NowLoRes() -
+                           eventQueueStart).ToMilliseconds() <
+                          mMaxTimePerPollIter));
+
+                if (mTelemetryEnabledPref && !mServingPendingQueue &&
+                    !startOfIteration.IsNull()) {
+                    Telemetry::AccumulateTimeDelta(
+                        Telemetry::STS_POLL_AND_EVENTS_CYCLE,
+                        startOfIteration + pollDuration,
+                        TimeStamp::NowLoRes());
+
+                    Telemetry::Accumulate(
+                        Telemetry::STS_NUMBER_OF_PENDING_EVENTS,
+                        numberOfPendingEvents);
+
+                    numberOfPendingEventsLastCycle += numberOfPendingEvents;
+                    numberOfPendingEvents = 0;
+                    pollDuration = 0;
+                }
+            }
+        } while (pendingEvents);
+
+        bool goingOffline = false;
+        // now that our event queue is empty, check to see if we should exit
+        {
+            MutexAutoLock lock(mLock);
+            if (mShuttingDown) {
+                if (mTelemetryEnabledPref &&
+                    !startOfCycleForLastCycleCalc.IsNull()) {
+                    Telemetry::Accumulate(
+                        Telemetry::STS_NUMBER_OF_PENDING_EVENTS_IN_THE_LAST_CYCLE,
+                        numberOfPendingEventsLastCycle);
+                    Telemetry::AccumulateTimeDelta(
+                        Telemetry::STS_POLL_AND_EVENT_THE_LAST_CYCLE,
+                        startOfCycleForLastCycleCalc,
+                        TimeStamp::NowLoRes());
+                }
+                break;
+            }
+            if (mGoingOffline) {
+                mGoingOffline = false;
+                goingOffline = true;
+            }
+        }
+        // Avoid potential deadlock
+        if (goingOffline)
+            Reset(true);
+    }
+
+    SOCKET_LOG(("STS shutting down thread\n"));
+
+    // detach all sockets, including locals
+    Reset(false);
+
+    // Final pass over the event queue. This makes sure that events posted by
+    // socket detach handlers get processed.
+    NS_ProcessPendingEvents(mRawThread);
+
+    gSocketThread = nullptr;
+
+    psm::StopSSLServerCertVerificationThreads();
+
+    SOCKET_LOG(("STS thread exit\n"));
+    return NS_OK;
+}
+
+void
+nsSocketTransportService::DetachSocketWithGuard(bool aGuardLocals,
+                                                SocketContext *socketList,
+                                                int32_t index)
+{
+    bool isGuarded = false;
+    if (aGuardLocals) {
+        socketList[index].mHandler->IsLocal(&isGuarded);
+        if (!isGuarded)
+            socketList[index].mHandler->KeepWhenOffline(&isGuarded);
+    }
+    if (!isGuarded)
+        DetachSocket(socketList, &socketList[index]);
+}
+
+void
+nsSocketTransportService::Reset(bool aGuardLocals)
+{
+    // detach any sockets
+    int32_t i;
+    for (i = mActiveCount - 1; i >= 0; --i) {
+        DetachSocketWithGuard(aGuardLocals, mActiveList, i);
+    }
+    for (i = mIdleCount - 1; i >= 0; --i) {
+        DetachSocketWithGuard(aGuardLocals, mIdleList, i);
+    }
+}
+
+nsresult
+nsSocketTransportService::DoPollIteration(TimeDuration *pollDuration)
+{
+    SOCKET_LOG(("STS poll iter\n"));
+
+    int32_t i, count;
+    //
+    // poll loop
+    //
+    // walk active list backwards to see if any sockets should actually be
+    // idle, then walk the idle list backwards to see if any idle sockets
+    // should become active.  take care to check only idle sockets that
+    // were idle to begin with ;-)
+    //
+    count = mIdleCount;
+    for (i=mActiveCount-1; i>=0; --i) {
+        //---
+        SOCKET_LOG(("  active [%u] { handler=%p condition=%x pollflags=%hu }\n", i,
+            mActiveList[i].mHandler,
+            mActiveList[i].mHandler->mCondition,
+            mActiveList[i].mHandler->mPollFlags));
+        //---
+        if (NS_FAILED(mActiveList[i].mHandler->mCondition))
+            DetachSocket(mActiveList, &mActiveList[i]);
+        else {
+            uint16_t in_flags = mActiveList[i].mHandler->mPollFlags;
+            if (in_flags == 0)
+                MoveToIdleList(&mActiveList[i]);
+            else {
+                // update poll flags
+                mPollList[i+1].in_flags = in_flags;
+                mPollList[i+1].out_flags = 0;
+            }
+        }
+    }
+    for (i=count-1; i>=0; --i) {
+        //---
+        SOCKET_LOG(("  idle [%u] { handler=%p condition=%x pollflags=%hu }\n", i,
+            mIdleList[i].mHandler,
+            mIdleList[i].mHandler->mCondition,
+            mIdleList[i].mHandler->mPollFlags));
+        //---
+        if (NS_FAILED(mIdleList[i].mHandler->mCondition))
+            DetachSocket(mIdleList, &mIdleList[i]);
+        else if (mIdleList[i].mHandler->mPollFlags != 0)
+            MoveToPollList(&mIdleList[i]);
+    }
+
+    SOCKET_LOG(("  calling PR_Poll [active=%u idle=%u]\n", mActiveCount, mIdleCount));
+
+#if defined(XP_WIN)
+    // 30 active connections is the historic limit before firefox 7's 256. A few
+    //  windows systems have troubles with the higher limit, so actively probe a
+    // limit the first time we exceed 30.
+    if ((mActiveCount > 30) && !mProbedMaxCount)
+        ProbeMaxCount();
+#endif
+
+    // Measures seconds spent while blocked on PR_Poll
+    uint32_t pollInterval = 0;
+    int32_t n = 0;
+    *pollDuration = 0;
+    if (!gIOService->IsNetTearingDown()) {
+        // Let's not do polling during shutdown.
+#if defined(XP_WIN)
+        StartPolling();
+#endif
+        n = Poll(&pollInterval, pollDuration);
+#if defined(XP_WIN)
+        EndPolling();
+#endif
+    }
+
+    if (n < 0) {
+        SOCKET_LOG(("  PR_Poll error [%d] os error [%d]\n", PR_GetError(),
+                    PR_GetOSError()));
+    }
+    else {
+        //
+        // service "active" sockets...
+        //
+        uint32_t numberOfOnSocketReadyCalls = 0;
+        for (i=0; i<int32_t(mActiveCount); ++i) {
+            PRPollDesc &desc = mPollList[i+1];
+            SocketContext &s = mActiveList[i];
+            if (n > 0 && desc.out_flags != 0) {
+                s.mElapsedTime = 0;
+                s.mHandler->OnSocketReady(desc.fd, desc.out_flags);
+                numberOfOnSocketReadyCalls++;
+            }
+            // check for timeout errors unless disabled...
+            else if (s.mHandler->mPollTimeout != UINT16_MAX) {
+                // update elapsed time counter
+                // (NOTE: We explicitly cast UINT16_MAX to be an unsigned value
+                // here -- otherwise, some compilers will treat it as signed,
+                // which makes them fire signed/unsigned-comparison build
+                // warnings for the comparison against 'pollInterval'.)
+                if (MOZ_UNLIKELY(pollInterval >
+                                static_cast<uint32_t>(UINT16_MAX) -
+                                s.mElapsedTime))
+                    s.mElapsedTime = UINT16_MAX;
+                else
+                    s.mElapsedTime += uint16_t(pollInterval);
+                // check for timeout expiration 
+                if (s.mElapsedTime >= s.mHandler->mPollTimeout) {
+                    s.mElapsedTime = 0;
+                    s.mHandler->OnSocketReady(desc.fd, -1);
+                    numberOfOnSocketReadyCalls++;
+                }
+            }
+        }
+        if (mTelemetryEnabledPref) {
+            Telemetry::Accumulate(
+                Telemetry::STS_NUMBER_OF_ONSOCKETREADY_CALLS,
+                numberOfOnSocketReadyCalls);
+        }
+
+        //
+        // check for "dead" sockets and remove them (need to do this in
+        // reverse order obviously).
+        //
+        for (i=mActiveCount-1; i>=0; --i) {
+            if (NS_FAILED(mActiveList[i].mHandler->mCondition))
+                DetachSocket(mActiveList, &mActiveList[i]);
+        }
+
+        if (n != 0 && (mPollList[0].out_flags & (PR_POLL_READ | PR_POLL_EXCEPT))) {
+            MutexAutoLock lock(mLock);
+
+            // acknowledge pollable event (should not block)
+            if (mPollableEvent &&
+                ((mPollList[0].out_flags & PR_POLL_EXCEPT) ||
+                 !mPollableEvent->Clear())) {
+                // On Windows, the TCP loopback connection in the
+                // pollable event may become broken when a laptop
+                // switches between wired and wireless networks or
+                // wakes up from hibernation.  We try to create a
+                // new pollable event.  If that fails, we fall back
+                // on "busy wait".
+                NS_WARNING("Trying to repair mPollableEvent");
+                mPollableEvent.reset(new PollableEvent());
+                if (!mPollableEvent->Valid()) {
+                    mPollableEvent = nullptr;
+                }
+                SOCKET_LOG(("running socket transport thread without "
+                            "a pollable event now valid=%d", !!mPollableEvent));
+                mPollList[0].fd = mPollableEvent ? mPollableEvent->PollableFD() : nullptr;
+                mPollList[0].in_flags = PR_POLL_READ | PR_POLL_EXCEPT;
+                mPollList[0].out_flags = 0;
+            }
+        }
+    }
+
+    return NS_OK;
+}
+
+void
+nsSocketTransportService::UpdateSendBufferPref(nsIPrefBranch *pref)
+{
+    int32_t bufferSize;
+
+    // If the pref is set, honor it. 0 means use OS defaults.
+    nsresult rv = pref->GetIntPref(SEND_BUFFER_PREF, &bufferSize);
+    if (NS_SUCCEEDED(rv)) {
+        mSendBufferSize = bufferSize;
+        return;
+    }
+
+#if defined(XP_WIN)
+    // If the pref is not set but this is windows set it depending on windows version
+    if (!IsWin2003OrLater()) { // windows xp
+        mSendBufferSize = 131072;
+    } else { // vista or later
+        mSendBufferSize = 131072 * 4;
+    }
+#endif
+}
+
+nsresult
+nsSocketTransportService::UpdatePrefs()
+{
+    mSendBufferSize = 0;
+
+    nsCOMPtr<nsIPrefBranch> tmpPrefService = do_GetService(NS_PREFSERVICE_CONTRACTID);
+    if (tmpPrefService) {
+        UpdateSendBufferPref(tmpPrefService);
+
+        // Default TCP Keepalive Values.
+        int32_t keepaliveIdleTimeS;
+        nsresult rv = tmpPrefService->GetIntPref(KEEPALIVE_IDLE_TIME_PREF,
+                                        &keepaliveIdleTimeS);
+        if (NS_SUCCEEDED(rv))
+            mKeepaliveIdleTimeS = clamped(keepaliveIdleTimeS,
+                                          1, kMaxTCPKeepIdle);
+
+        int32_t keepaliveRetryIntervalS;
+        rv = tmpPrefService->GetIntPref(KEEPALIVE_RETRY_INTERVAL_PREF,
+                                        &keepaliveRetryIntervalS);
+        if (NS_SUCCEEDED(rv))
+            mKeepaliveRetryIntervalS = clamped(keepaliveRetryIntervalS,
+                                               1, kMaxTCPKeepIntvl);
+
+        int32_t keepaliveProbeCount;
+        rv = tmpPrefService->GetIntPref(KEEPALIVE_PROBE_COUNT_PREF,
+                                        &keepaliveProbeCount);
+        if (NS_SUCCEEDED(rv))
+            mKeepaliveProbeCount = clamped(keepaliveProbeCount,
+                                           1, kMaxTCPKeepCount);
+        bool keepaliveEnabled = false;
+        rv = tmpPrefService->GetBoolPref(KEEPALIVE_ENABLED_PREF,
+                                         &keepaliveEnabled);
+        if (NS_SUCCEEDED(rv) && keepaliveEnabled != mKeepaliveEnabledPref) {
+            mKeepaliveEnabledPref = keepaliveEnabled;
+            OnKeepaliveEnabledPrefChange();
+        }
+
+        int32_t maxTimePref;
+        rv = tmpPrefService->GetIntPref(MAX_TIME_BETWEEN_TWO_POLLS,
+                                        &maxTimePref);
+        if (NS_SUCCEEDED(rv) && maxTimePref >= 0) {
+            mMaxTimePerPollIter = maxTimePref;
+        }
+
+        bool telemetryPref = false;
+        rv = tmpPrefService->GetBoolPref(TELEMETRY_PREF,
+                                         &telemetryPref);
+        if (NS_SUCCEEDED(rv)) {
+            mTelemetryEnabledPref = telemetryPref;
+        }
+
+        int32_t maxTimeForPrClosePref;
+        rv = tmpPrefService->GetIntPref(MAX_TIME_FOR_PR_CLOSE_DURING_SHUTDOWN,
+                                        &maxTimeForPrClosePref);
+        if (NS_SUCCEEDED(rv) && maxTimeForPrClosePref >=0) {
+            mMaxTimeForPrClosePref = PR_MillisecondsToInterval(maxTimeForPrClosePref);
+        }
+    }
+
+    return NS_OK;
+}
+
+void
+nsSocketTransportService::OnKeepaliveEnabledPrefChange()
+{
+    // Dispatch to socket thread if we're not executing there.
+    if (PR_GetCurrentThread() != gSocketThread) {
+        gSocketTransportService->Dispatch(
+            NewRunnableMethod(
+                this, &nsSocketTransportService::OnKeepaliveEnabledPrefChange),
+            NS_DISPATCH_NORMAL);
+        return;
+    }
+
+    SOCKET_LOG(("nsSocketTransportService::OnKeepaliveEnabledPrefChange %s",
+                mKeepaliveEnabledPref ? "enabled" : "disabled"));
+
+    // Notify each socket that keepalive has been en/disabled globally.
+    for (int32_t i = mActiveCount - 1; i >= 0; --i) {
+        NotifyKeepaliveEnabledPrefChange(&mActiveList[i]);
+    }
+    for (int32_t i = mIdleCount - 1; i >= 0; --i) {
+        NotifyKeepaliveEnabledPrefChange(&mIdleList[i]);
+    }
+}
+
+void
+nsSocketTransportService::NotifyKeepaliveEnabledPrefChange(SocketContext *sock)
+{
+    MOZ_ASSERT(sock, "SocketContext cannot be null!");
+    MOZ_ASSERT(sock->mHandler, "SocketContext does not have a handler!");
+
+    if (!sock || !sock->mHandler) {
+        return;
+    }
+
+    sock->mHandler->OnKeepaliveEnabledPrefChange(mKeepaliveEnabledPref);
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::Observe(nsISupports *subject,
+                                  const char *topic,
+                                  const char16_t *data)
+{
+    if (!strcmp(topic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
+        UpdatePrefs();
+        return NS_OK;
+    }
+
+    if (!strcmp(topic, "profile-initial-state")) {
+        int32_t blipInterval = Preferences::GetInt(BLIP_INTERVAL_PREF, 0);
+        if (blipInterval <= 0) {
+            return NS_OK;
+        }
+
+        return net::NetworkActivityMonitor::Init(blipInterval);
+    }
+
+    if (!strcmp(topic, "last-pb-context-exited")) {
+        nsCOMPtr<nsIRunnable> ev =
+          NewRunnableMethod(this,
+			    &nsSocketTransportService::ClosePrivateConnections);
+        nsresult rv = Dispatch(ev, nsIEventTarget::DISPATCH_NORMAL);
+        NS_ENSURE_SUCCESS(rv, rv);
+    }
+
+    if (!strcmp(topic, NS_TIMER_CALLBACK_TOPIC)) {
+        nsCOMPtr<nsITimer> timer = do_QueryInterface(subject);
+        if (timer == mAfterWakeUpTimer) {
+            mAfterWakeUpTimer = nullptr;
+            mSleepPhase = false;
+        }
+
+#if defined(XP_WIN)
+        if (timer == mPollRepairTimer) {
+            DoPollRepair();
+        }
+#endif
+
+    } else if (!strcmp(topic, NS_WIDGET_SLEEP_OBSERVER_TOPIC)) {
+        mSleepPhase = true;
+        if (mAfterWakeUpTimer) {
+            mAfterWakeUpTimer->Cancel();
+            mAfterWakeUpTimer = nullptr;
+        }
+    } else if (!strcmp(topic, NS_WIDGET_WAKE_OBSERVER_TOPIC)) {
+        if (mSleepPhase && !mAfterWakeUpTimer) {
+            mAfterWakeUpTimer = do_CreateInstance("@mozilla.org/timer;1");
+            if (mAfterWakeUpTimer) {
+                mAfterWakeUpTimer->Init(this, 2000, nsITimer::TYPE_ONE_SHOT);
+            }
+        }
+    } else if (!strcmp(topic, "xpcom-shutdown-threads")) {
+        ShutdownThread();
+    }
+
+    return NS_OK;
+}
+
+void
+nsSocketTransportService::ClosePrivateConnections()
+{
+    // Must be called on the socket thread.
+#ifdef DEBUG
+    bool onSTSThread;
+    IsOnCurrentThread(&onSTSThread);
+    MOZ_ASSERT(onSTSThread);
+#endif
+
+    for (int32_t i = mActiveCount - 1; i >= 0; --i) {
+        if (mActiveList[i].mHandler->mIsPrivate) {
+            DetachSocket(mActiveList, &mActiveList[i]);
+        }
+    }
+    for (int32_t i = mIdleCount - 1; i >= 0; --i) {
+        if (mIdleList[i].mHandler->mIsPrivate) {
+            DetachSocket(mIdleList, &mIdleList[i]);
+        }
+    }
+
+    ClearPrivateSSLState();
+}
+
+NS_IMETHODIMP
+nsSocketTransportService::GetSendBufferSize(int32_t *value)
+{
+    *value = mSendBufferSize;
+    return NS_OK;
+}
+
+
+/// ugly OS specific includes are placed at the bottom of the src for clarity
+
+#if defined(XP_WIN)
+#include <windows.h>
+#elif defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP) && !defined(QNX)
+#include <sys/resource.h>
+#endif
+
+// Right now the only need to do this is on windows.
+#if defined(XP_WIN)
+void
+nsSocketTransportService::ProbeMaxCount()
+{
+    NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
+
+    if (mProbedMaxCount)
+        return;
+    mProbedMaxCount = true;
+
+    // Allocate and test a PR_Poll up to the gMaxCount number of unconnected
+    // sockets. See bug 692260 - windows should be able to handle 1000 sockets
+    // in select() without a problem, but LSPs have been known to balk at lower
+    // numbers. (64 in the bug).
+
+    // Allocate
+    struct PRPollDesc pfd[SOCKET_LIMIT_TARGET];
+    uint32_t numAllocated = 0;
+
+    for (uint32_t index = 0 ; index < gMaxCount; ++index) {
+        pfd[index].in_flags = PR_POLL_READ | PR_POLL_WRITE | PR_POLL_EXCEPT;
+        pfd[index].out_flags = 0;
+        pfd[index].fd =  PR_OpenTCPSocket(PR_AF_INET);
+        if (!pfd[index].fd) {
+            SOCKET_LOG(("Socket Limit Test index %d failed\n", index));
+            if (index < SOCKET_LIMIT_MIN)
+                gMaxCount = SOCKET_LIMIT_MIN;
+            else
+                gMaxCount = index;
+            break;
+        }
+        ++numAllocated;
+    }
+
+    // Test
+    static_assert(SOCKET_LIMIT_MIN >= 32U, "Minimum Socket Limit is >= 32");
+    while (gMaxCount <= numAllocated) {
+        int32_t rv = PR_Poll(pfd, gMaxCount, PR_MillisecondsToInterval(0));
+        
+        SOCKET_LOG(("Socket Limit Test poll() size=%d rv=%d\n",
+                    gMaxCount, rv));
+
+        if (rv >= 0)
+            break;
+
+        SOCKET_LOG(("Socket Limit Test poll confirmationSize=%d rv=%d error=%d\n",
+                    gMaxCount, rv, PR_GetError()));
+
+        gMaxCount -= 32;
+        if (gMaxCount <= SOCKET_LIMIT_MIN) {
+            gMaxCount = SOCKET_LIMIT_MIN;
+            break;
+        }
+    }
+
+    // Free
+    for (uint32_t index = 0 ; index < numAllocated; ++index)
+        if (pfd[index].fd)
+            PR_Close(pfd[index].fd);
+
+    Telemetry::Accumulate(Telemetry::NETWORK_PROBE_MAXCOUNT, gMaxCount);
+    SOCKET_LOG(("Socket Limit Test max was confirmed at %d\n", gMaxCount));
+}
+#endif // windows
+
+PRStatus
+nsSocketTransportService::DiscoverMaxCount()
+{
+    gMaxCount = SOCKET_LIMIT_MIN;
+
+#if defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP) && !defined(QNX)
+    // On unix and os x network sockets and file
+    // descriptors are the same. OS X comes defaulted at 256,
+    // most linux at 1000. We can reliably use [sg]rlimit to
+    // query that and raise it if needed.
+
+    struct rlimit rlimitData;
+    if (getrlimit(RLIMIT_NOFILE, &rlimitData) == -1) // rlimit broken - use min
+        return PR_SUCCESS;
+
+    if (rlimitData.rlim_cur >= SOCKET_LIMIT_TARGET) { // larger than target!
+        gMaxCount = SOCKET_LIMIT_TARGET;
+        return PR_SUCCESS;
+    }
+
+    int32_t maxallowed = rlimitData.rlim_max;
+    if ((uint32_t)maxallowed <= SOCKET_LIMIT_MIN) {
+        return PR_SUCCESS; // so small treat as if rlimit is broken
+    }
+
+    if ((maxallowed == -1) || // no hard cap - ok to set target
+        ((uint32_t)maxallowed >= SOCKET_LIMIT_TARGET)) {
+        maxallowed = SOCKET_LIMIT_TARGET;
+    }
+
+    rlimitData.rlim_cur = maxallowed;
+    setrlimit(RLIMIT_NOFILE, &rlimitData);
+    if ((getrlimit(RLIMIT_NOFILE, &rlimitData) != -1) &&
+        (rlimitData.rlim_cur > SOCKET_LIMIT_MIN)) {
+        gMaxCount = rlimitData.rlim_cur;
+    }
+
+#elif defined(XP_WIN) && !defined(WIN_CE)
+    // >= XP is confirmed to have at least 1000
+    static_assert(SOCKET_LIMIT_TARGET <= 1000, "SOCKET_LIMIT_TARGET max value is 1000");
+    gMaxCount = SOCKET_LIMIT_TARGET;
+#else
+    // other platforms are harder to test - so leave at safe legacy value
+#endif
+
+    return PR_SUCCESS;
+}
+
+
+// Used to return connection info to Dashboard.cpp
+void
+nsSocketTransportService::AnalyzeConnection(nsTArray<SocketInfo> *data,
+        struct SocketContext *context, bool aActive)
+{
+    if (context->mHandler->mIsPrivate)
+        return;
+    PRFileDesc *aFD = context->mFD;
+
+    PRFileDesc *idLayer = PR_GetIdentitiesLayer(aFD, PR_NSPR_IO_LAYER);
+
+    NS_ENSURE_TRUE_VOID(idLayer);
+
+    bool tcp = PR_GetDescType(idLayer) == PR_DESC_SOCKET_TCP;
+
+    PRNetAddr peer_addr;
+    PodZero(&peer_addr);
+    PRStatus rv = PR_GetPeerName(aFD, &peer_addr);
+    if (rv != PR_SUCCESS)
+       return;
+
+    char host[64] = {0};
+    rv = PR_NetAddrToString(&peer_addr, host, sizeof(host));
+    if (rv != PR_SUCCESS)
+       return;
+
+    uint16_t port;
+    if (peer_addr.raw.family == PR_AF_INET)
+        port = peer_addr.inet.port;
+    else
+        port = peer_addr.ipv6.port;
+    port = PR_ntohs(port);
+    uint64_t sent = context->mHandler->ByteCountSent();
+    uint64_t received = context->mHandler->ByteCountReceived();
+    SocketInfo info = { nsCString(host), sent, received, port, aActive, tcp };
+
+    data->AppendElement(info);
+}
+
+void
+nsSocketTransportService::GetSocketConnections(nsTArray<SocketInfo> *data)
+{
+    NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
+    for (uint32_t i = 0; i < mActiveCount; i++)
+        AnalyzeConnection(data, &mActiveList[i], true);
+    for (uint32_t i = 0; i < mIdleCount; i++)
+        AnalyzeConnection(data, &mIdleList[i], false);
+}
+
+#if defined(XP_WIN)
+void
+nsSocketTransportService::StartPollWatchdog()
+{
+    MutexAutoLock lock(mLock);
+
+    // Poll can hang sometimes. If we are in shutdown, we are going to start a
+    // watchdog. If we do not exit poll within REPAIR_POLLABLE_EVENT_TIME
+    // signal a pollable event again.
+    MOZ_ASSERT(gIOService->IsNetTearingDown());
+    if (mPolling && !mPollRepairTimer) {
+        mPollRepairTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
+        mPollRepairTimer->Init(this, REPAIR_POLLABLE_EVENT_TIME,
+                               nsITimer::TYPE_REPEATING_SLACK);
+    }
+}
+
+void
+nsSocketTransportService::DoPollRepair()
+{
+    MutexAutoLock lock(mLock);
+    if (mPolling && mPollableEvent) {
+        mPollableEvent->Signal();
+    } else if (mPollRepairTimer) {
+        mPollRepairTimer->Cancel();
+    }
+}
+
+void
+nsSocketTransportService::StartPolling()
+{
+    MutexAutoLock lock(mLock);
+    mPolling = true;
+}
+
+void
+nsSocketTransportService::EndPolling()
+{
+    MutexAutoLock lock(mLock);
+    mPolling = false;
+    if (mPollRepairTimer) {
+        mPollRepairTimer->Cancel();
+    }
+}
+#endif
+
+} // namespace net
+} // namespace mozilla