Revert "Issue #1695 - Add clamping to websocket polling timeouts."

As of [da0c073a7] we no longer need this workaround because the issue is avoided
with proper sleep/wake logic restored.

This reverts commit 2fa993b563.

modules/libpref/init/all.js

@@ -1660,11 +1660,6 @@ pref("network.websocket.timeout.open", 20);
 // close message
 pref("network.websocket.timeout.close", 20);
 
-// Setting this to true will clamp the websocket timeout value to a minimum
-// regardless if there are pending events on the thread.
-// This is a workaround for runaway polling, see issue #1695
-pref("network.websocket.timeout.clamped", false);
-
 // the number of seconds of idle read activity to sustain before sending a
 // ping probe. 0 to disable.
 pref("network.websocket.timeout.ping.request", 0);

netwerk/base/nsSocketTransportService2.cpp

@@ -42,7 +42,6 @@ Atomic<PRThread*, Relaxed> gSocketThread;
 #define KEEPALIVE_PROBE_COUNT_PREF "network.tcp.keepalive.probe_count"
 #define SOCKET_LIMIT_TARGET 1000U
 #define SOCKET_LIMIT_MIN      50U
-#define SOCKET_CLAMP_PREF "network.websocket.timeout.clamped"
 #define BLIP_INTERVAL_PREF "network.activity.blipIntervalMilliseconds"
 #define MAX_TIME_BETWEEN_TWO_POLLS "network.sts.max_time_for_events_between_two_polls"
 #define MAX_TIME_FOR_PR_CLOSE_DURING_SHUTDOWN "network.sts.max_time_for_pr_close_during_shutdown"
@@ -121,7 +120,6 @@ nsSocketTransportService::nsSocketTransportService()
     , mKeepaliveEnabledPref(false)
     , mServingPendingQueue(false)
     , mMaxTimePerPollIter(100)
-    , mClampSocketTimeout(false)
     , mMaxTimeForPrClosePref(PR_SecondsToInterval(5))
     , mSleepPhase(false)
     , mProbedMaxCount(false)
@@ -488,11 +486,7 @@ nsSocketTransportService::Poll(PRIntervalTime ts)
         mPollList[0].out_flags = 0;
         pollList = mPollList;
         pollCount = mActiveCount + 1;
-        pollTimeout = IsSocketTimeoutClamped() ?
-                        PR_MillisecondsToInterval(100) :
-                        pendingEvents ?
-                          PR_INTERVAL_NO_WAIT :
-                          PollTimeout(ts);
+        pollTimeout = pendingEvents ? PR_INTERVAL_NO_WAIT : PollTimeout(ts);
     }
     else {
         // no pollable event, so busy wait...
@@ -501,11 +495,8 @@ nsSocketTransportService::Poll(PRIntervalTime ts)
             pollList = &mPollList[1];
         else
             pollList = nullptr;
-        pollTimeout = IsSocketTimeoutClamped() ?
-                        PR_MillisecondsToInterval(25) :
-                        pendingEvents ? 
-                          PR_INTERVAL_NO_WAIT :
-                          PR_MillisecondsToInterval(25);
+        pollTimeout =
+            pendingEvents ? PR_INTERVAL_NO_WAIT : PR_MillisecondsToInterval(25);
     }
 
     SOCKET_LOG(("    timeout = %i milliseconds\n",
@@ -564,7 +555,6 @@ nsSocketTransportService::Init()
         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(SOCKET_CLAMP_PREF, this, false);
         tmpPrefService->AddObserver(MAX_TIME_FOR_PR_CLOSE_DURING_SHUTDOWN, this, false);
     }
     UpdatePrefs();
@@ -1170,13 +1160,6 @@ nsSocketTransportService::UpdatePrefs()
         if (NS_SUCCEEDED(rv) && maxTimePref >= 0) {
             mMaxTimePerPollIter = maxTimePref;
         }
-        
-        bool socketTimeoutClamped = false;
-        rv = tmpPrefService->GetBoolPref(SOCKET_CLAMP_PREF,
-                                         &socketTimeoutClamped);
-        if (NS_SUCCEEDED(rv)) {
-            mClampSocketTimeout = socketTimeoutClamped;
-        }      
 
         int32_t maxTimeForPrClosePref;
         rv = tmpPrefService->GetIntPref(MAX_TIME_FOR_PR_CLOSE_DURING_SHUTDOWN,

netwerk/base/nsSocketTransportService2.h

@@ -116,9 +116,6 @@ public:
 
     // Returns true if keepalives are enabled in prefs.
     bool IsKeepaliveEnabled() { return mKeepaliveEnabledPref; }
-    
-    // Returns true if socket timeout clamping is enabled in prefs.
-    bool IsSocketTimeoutClamped() { return mClampSocketTimeout; }
 
     PRIntervalTime MaxTimeForPrClosePref() {return mMaxTimeForPrClosePref; }
 protected:
@@ -256,8 +253,6 @@ private:
     int32_t     mKeepaliveProbeCount;
     // True if TCP keepalive is enabled globally.
     bool        mKeepaliveEnabledPref;
-    // True if socket polling should be clamped.
-    bool        mClampSocketTimeout;
 
     Atomic<bool>                    mServingPendingQueue;
     Atomic<int32_t, Relaxed>        mMaxTimePerPollIter;