merge changes for latest snowstorm project viewer

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diff --git a/indra/llcorehttp/_httpinternal.h b/indra/llcorehttp/_httpinternal.h
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+/**
+ * @file _httpinternal.h
+ * @brief Implementation constants and magic numbers
+ *
+ * $LicenseInfo:firstyear=2012&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, 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
+ * $/LicenseInfo$
+ */
+
+#ifndef	_LLCORE_HTTP_INTERNAL_H_
+#define	_LLCORE_HTTP_INTERNAL_H_
+
+
+// If you find this included in a public interface header,
+// something wrong is probably happening.
+
+
+// --------------------------------------------------------------------
+// General library to-do list
+//
+// - Implement policy classes.  Structure is mostly there just didn't
+//   need it for the first consumer.
+// - Consider Removing 'priority' from the request interface.  Its use
+//   in an always active class can lead to starvation of low-priority
+//   requests.  Requires coodination of priority values across all
+//   components that share a class.  Changing priority across threads
+//   is slightly expensive (relative to gain) and hasn't been completely
+//   implemented.  And the major user of priority, texture fetches,
+//   may not really need it.
+// - Set/get for global policy and policy classes is clumsy.  Rework
+//   it heading in a direction that allows for more dynamic behavior.
+// - Move HttpOpRequest::prepareRequest() to HttpLibcurl for the
+//   pedantic.
+// - Update downloader and other long-duration services are going to
+//   need a progress notification.  Initial idea is to introduce a
+//   'repeating request' which can piggyback on another request and
+//   persist until canceled or carrier completes.  Current queue
+//   structures allow an HttpOperation object to be enqueued
+//   repeatedly, so...
+// - Investigate making c-ares' re-implementation of a resolver library
+//   more resilient or more intelligent on Mac.  Part of the DNS failure
+//   lies in here.  The mechanism also looks a little less dynamic
+//   than needed in an environments where networking is changing.
+// - Global optimizations:  'borrowing' connections from other classes,
+//   HTTP pipelining.
+// - Dynamic/control system stuff:  detect problems and self-adjust.
+//   This won't help in the face of the router problems we've looked
+//   at, however.  Detect starvation due to UDP activity and provide
+//   feedback to it.
+//
+// Integration to-do list
+// - LLTextureFetch still needs a major refactor.  The use of
+//   LLQueuedThread makes it hard to inspect workers and do the
+//   resource waiting we're now doing.  Rebuild along simpler lines
+//   some of which are suggested in new commentary at the top of
+//   the main source file.
+// - Expand areas of usage eventually leading to the removal of LLCurl.
+//   Rough order of expansion:
+//   .  Mesh fetch
+//   .  Avatar names
+//   .  Group membership lists
+//   .  Caps access in general
+//   .  'The rest'
+// - Adapt texture cache, image decode and other image consumers to
+//   the BufferArray model to reduce data copying.  Alternatively,
+//   adapt this library to something else.
+//
+// --------------------------------------------------------------------
+
+
+// If '1', internal ready queues will not order ready
+// requests by priority, instead it's first-come-first-served.
+// Reprioritization requests have the side-effect of then
+// putting the modified request at the back of the ready queue.
+
+#define	LLCORE_HTTP_READY_QUEUE_IGNORES_PRIORITY		1
+
+
+namespace LLCore
+{
+
+// Maxium number of policy classes that can be defined.
+// *TODO:  Currently limited to the default class, extend.
+const int HTTP_POLICY_CLASS_LIMIT = 1;
+
+// Debug/informational tracing.  Used both
+// as a global option and in per-request traces.
+const int HTTP_TRACE_OFF = 0;
+const int HTTP_TRACE_LOW = 1;
+const int HTTP_TRACE_CURL_HEADERS = 2;
+const int HTTP_TRACE_CURL_BODIES = 3;
+
+const int HTTP_TRACE_MIN = HTTP_TRACE_OFF;
+const int HTTP_TRACE_MAX = HTTP_TRACE_CURL_BODIES;
+
+// Request retry limits
+//
+// At a minimum, retries need to extend past any throttling
+// window we're expecting from central services.  In the case
+// of Linden services running through the caps routers, there's
+// a five-second or so window for throttling with some spillover.
+// We want to span a few windows to allow transport to slow
+// after onset of the throttles and then recover without a final
+// failure.  Other systems may need other constants.
+const int HTTP_RETRY_COUNT_DEFAULT = 8;
+const int HTTP_RETRY_COUNT_MIN = 0;
+const int HTTP_RETRY_COUNT_MAX = 100;
+
+const int HTTP_REDIRECTS_DEFAULT = 10;
+
+// Timeout value used for both connect and protocol exchange.
+// Retries and time-on-queue are not included and aren't
+// accounted for.
+const long HTTP_REQUEST_TIMEOUT_DEFAULT = 30L;
+const long HTTP_REQUEST_TIMEOUT_MIN = 0L;
+const long HTTP_REQUEST_TIMEOUT_MAX = 3600L;
+
+// Limits on connection counts
+const int HTTP_CONNECTION_LIMIT_DEFAULT = 8;
+const int HTTP_CONNECTION_LIMIT_MIN = 1;
+const int HTTP_CONNECTION_LIMIT_MAX = 256;
+
+// Tuning parameters
+
+// Time worker thread sleeps after a pass through the
+// request, ready and active queues.
+const int HTTP_SERVICE_LOOP_SLEEP_NORMAL_MS = 2;
+
+// Block allocation size (a tuning parameter) is found
+// in bufferarray.h.
+
+// Compatibility controls
+const bool HTTP_ENABLE_LINKSYS_WRT54G_V5_DNS_FIX = true;
+
+}  // end namespace LLCore
+
+#endif	// _LLCORE_HTTP_INTERNAL_H_