SourceFormat Enforcement

[thirdparty/squid.git] / src / EventLoop.cc

diff --git a/src/EventLoop.cc b/src/EventLoop.cc
index 1b04926c8841a78592b0890f105a5396f290f0e3..5fce06144e63ee255366c8b9b8dc6c82db06e479 100644 (file)
--- a/src/EventLoop.cc
+++ b/src/EventLoop.cc
@@ -1,42 +1,28 @@
-
 /*
- * $Id: EventLoop.cc,v 1.5 2007/07/23 19:55:21 rousskov Exp $
- *
- * DEBUG: section 1     Main Loop
- * AUTHOR: Harvest Derived
- *
- * SQUID Web Proxy Cache          http://www.squid-cache.org/
- * ----------------------------------------------------------
- *
- *  Squid is the result of efforts by numerous individuals from
- *  the Internet community; see the CONTRIBUTORS file for full
- *  details.   Many organizations have provided support for Squid's
- *  development; see the SPONSORS file for full details.  Squid is
- *  Copyrighted (C) 2001 by the Regents of the University of
- *  California; see the COPYRIGHT file for full details.  Squid
- *  incorporates software developed and/or copyrighted by other
- *  sources; see the CREDITS file for full details.
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *  
- *  This program 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 General Public License for more details.
- *  
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+ * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
  *
+ * Squid software is distributed under GPLv2+ license and includes
+ * contributions from numerous individuals and organizations.
+ * Please see the COPYING and CONTRIBUTORS files for details.
  */
 
+/* DEBUG: section 01    Main Loop */
+
+#include "squid.h"
+#include "AsyncEngine.h"
+#include "base/AsyncCallQueue.h"
+#include "Debug.h"
 #include "EventLoop.h"
+#include "fatal.h"
+#include "SquidTime.h"
+
+EventLoop *EventLoop::Running = NULL;
 
 EventLoop::EventLoop() : errcount(0), last_loop(false), timeService(NULL),
-        primaryEngine(NULL)
+    primaryEngine(NULL),
+    loop_delay(EVENT_LOOP_TIMEOUT),
+    error(false),
+    runOnceResult(false)
 {}
 
 void
@@ -80,12 +66,6 @@ EventLoop::prepareToRun()
     errcount = 0;
 }
 
-void
-EventLoop::registerDispatcher(CompletionDispatcher *dispatcher)
-{
-    dispatchers.push_back(dispatcher);
-}
-
 void
 EventLoop::registerEngine(AsyncEngine *engine)
 {
@@ -97,43 +77,54 @@ EventLoop::run()
 {
     prepareToRun();
 
-    while (!runOnce())
+    assert(!Running);
+    Running = this;
+
+    while (!runOnce());
 
-        ;
+    Running = NULL;
 }
 
 bool
 EventLoop::runOnce()
 {
+    bool sawActivity = false;
     runOnceResult = true;
     error = false;
-    loop_delay = 10; /* 10 ms default delay */
-
-    for (engine_vector::iterator i = engines.begin();
-            i != engines.end(); ++i) {
-        /* check the primary outside the loop */
-
-        if (*i == primaryEngine)
-            continue;
+    loop_delay = EVENT_LOOP_TIMEOUT;
+
+    AsyncEngine *waitingEngine = primaryEngine;
+    if (!waitingEngine && !engines.empty())
+        waitingEngine = engines.back();
+
+    do {
+        // generate calls and events
+        typedef engine_vector::iterator EVI;
+        for (EVI i = engines.begin(); i != engines.end(); ++i) {
+            if (*i != waitingEngine)
+                checkEngine(*i, false);
+        }
 
-        /* special case the last engine to be primary */
-        checkEngine(*i, primaryEngine == NULL && (i - engines.end() == -1));
-    }
+        // dispatch calls accumulated so far
+        sawActivity = dispatchCalls();
+        if (sawActivity)
+            runOnceResult = false;
+    } while (sawActivity);
 
-    if (primaryEngine != NULL)
-        checkEngine(primaryEngine, true);
+    if (waitingEngine != NULL)
+        checkEngine(waitingEngine, true);
 
     if (timeService != NULL)
         timeService->tick();
 
-    for (dispatcher_vector::iterator i = dispatchers.begin();
-            i != dispatchers.end(); ++i)
-        if ((*i)->dispatch())
-            runOnceResult = false;
+    // dispatch calls scheduled by waitingEngine and timeService
+    sawActivity = dispatchCalls();
+    if (sawActivity)
+        runOnceResult = false;
 
     if (error) {
         ++errcount;
-        debugs(1, 0, "Select loop Error. Retry " << errcount);
+        debugs(1, DBG_CRITICAL, "Select loop Error. Retry " << errcount);
     } else
         errcount = 0;
 
@@ -146,6 +137,14 @@ EventLoop::runOnce()
     return runOnceResult;
 }
 
+// dispatches calls accumulated during checkEngine()
+bool
+EventLoop::dispatchCalls()
+{
+    bool dispatchedSome = AsyncCallQueue::Instance().fire();
+    return dispatchedSome;
+}
+
 void
 EventLoop::setPrimaryEngine(AsyncEngine * engine)
 {
@@ -170,3 +169,4 @@ EventLoop::stop()
 {
     last_loop = true;
 }
+