Page Speed Optimization Libraries  1.5.27.2
net/instaweb/util/public/shared_mem_lock_manager.h
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00001 /*
00002  * Copyright 2011 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_SHARED_MEM_LOCK_MANAGER_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_SHARED_MEM_LOCK_MANAGER_H_
00021 
00022 #include <cstddef>
00023 
00024 #include "net/instaweb/util/public/basictypes.h"
00025 #include "net/instaweb/util/public/named_lock_manager.h"
00026 #include "net/instaweb/util/public/scoped_ptr.h"
00027 #include "net/instaweb/util/public/string.h"
00028 #include "net/instaweb/util/public/string_util.h"
00029 
00030 namespace net_instaweb {
00031 
00032 class AbstractSharedMem;
00033 class AbstractSharedMemSegment;
00034 class Hasher;
00035 class MessageHandler;
00036 class Scheduler;
00037 
00038 namespace SharedMemLockData {
00039 
00040 struct Bucket;
00041 
00042 }  
00043 
00048 class SharedMemLockManager : public NamedLockManager {
00049  public:
00054   SharedMemLockManager(
00055       AbstractSharedMem* shm, const GoogleString& path, Scheduler* scheduler,
00056       Hasher* hasher, MessageHandler* handler);
00057   virtual ~SharedMemLockManager();
00058 
00061   bool Initialize();
00062 
00065   bool Attach();
00066 
00072   static void GlobalCleanup(AbstractSharedMem* shm, const GoogleString& path,
00073                             MessageHandler* message_handler);
00074 
00075   virtual NamedLock* CreateNamedLock(const StringPiece& name);
00076 
00077  private:
00078   friend class SharedMemLock;
00079 
00080   SharedMemLockData::Bucket* Bucket(size_t bucket);
00081 
00083   size_t MutexOffset(SharedMemLockData::Bucket*);
00084 
00085   AbstractSharedMem* shm_runtime_;
00086   GoogleString path_;
00087 
00088   scoped_ptr<AbstractSharedMemSegment> seg_;
00089   Scheduler* scheduler_;
00090   Hasher* hasher_;
00091   MessageHandler* handler_;
00092   size_t lock_size_;
00093 
00094   DISALLOW_COPY_AND_ASSIGN(SharedMemLockManager);
00095 };
00096 
00097 }  
00098 
00099 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_SHARED_MEM_LOCK_MANAGER_H_
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