Create a QUIC wrapper around a mutex and a mutex lock.

net/tools/quic/quic_http_response_cache.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
 #define NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
 
 #include <list>
 #include <map>
 #include <memory>
 #include <string>
 #include <unordered_map>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/strings/string_piece.h"
 #include "net/http/http_response_headers.h"
 #include "net/quic/core/spdy_utils.h"
+#include "net/quic/platform/api/quic_mutex.h"
 #include "net/spdy/spdy_framer.h"
 #include "url/gurl.h"
 
 namespace net {
 
 // In-memory cache for HTTP responses.
 // Reads from disk cache generated by:
 // `wget -p --save_headers <url>`
 class QuicHttpResponseCache {
  public:
@@ skipping 164 matching lines @@
   void MaybeAddServerPushResources(base::StringPiece request_host,
                                    base::StringPiece request_path,
                                    std::list<ServerPushInfo> push_resources);
 
   // Check if push resource(push_host/push_path) associated with given request
   // url already exists in server push map.
   bool PushResourceExistsInCache(std::string original_request_url,
                                  ServerPushInfo resource);
 
   // Cached responses.
-  std::unordered_map<std::string, std::unique_ptr<Response>> responses_;
+  std::unordered_map<std::string, std::unique_ptr<Response>> responses_
+      GUARDED_BY(response_mutex_);
 
   // The default response for cache misses, if set.
-  std::unique_ptr<Response> default_response_;
+  std::unique_ptr<Response> default_response_ GUARDED_BY(response_mutex_);
 
   // A map from request URL to associated server push responses (if any).
-  std::multimap<std::string, ServerPushInfo> server_push_resources_;
+  std::multimap<std::string, ServerPushInfo> server_push_resources_
+      GUARDED_BY(response_mutex_);
 
   // Protects against concurrent access from test threads setting responses, and
   // server threads accessing those responses.
-  mutable base::Lock response_mutex_;
+  mutable QuicMutex response_mutex_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicHttpResponseCache);
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_