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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
commitf215e02bf85f68d3a6106c2a1f4f7f063f819064 (patch)
tree6bb5b92c046312c4e95ac2620b10ddf482d3fa8b /src/libs/xpcom18a4/xpcom/ds/nsBaseHashtable.h
parentInitial commit. (diff)
downloadvirtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.tar.xz
virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.zip
Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/libs/xpcom18a4/xpcom/ds/nsBaseHashtable.h')
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is C++ hashtable templates.
+ *
+ * The Initial Developer of the Original Code is
+ * Benjamin Smedberg.
+ * Portions created by the Initial Developer are Copyright (C) 2002
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsBaseHashtable_h__
+#define nsBaseHashtable_h__
+
+#include "nsTHashtable.h"
+#include "prlock.h"
+#include "nsDebug.h"
+
+template<class KeyClass,class DataType,class UserDataType>
+class nsBaseHashtable; // forward declaration
+
+/**
+ * the private nsTHashtable::EntryType class used by nsBaseHashtable
+ * @see nsTHashtable for the specification of this class
+ * @see nsBaseHashtable for template parameters
+ */
+template<class KeyClass,class DataType>
+class nsBaseHashtableET : public KeyClass
+{
+public:
+ DataType mData;
+ friend class nsTHashtable< nsBaseHashtableET<KeyClass,DataType> >;
+
+private:
+ typedef typename KeyClass::KeyType KeyType;
+ typedef typename KeyClass::KeyTypePointer KeyTypePointer;
+
+ nsBaseHashtableET(KeyTypePointer aKey);
+ nsBaseHashtableET(nsBaseHashtableET<KeyClass,DataType>& toCopy);
+ ~nsBaseHashtableET();
+};
+
+/**
+ * templated hashtable for simple data types
+ * This class manages simple data types that do not need construction or
+ * destruction. Thread-safety is optional, via a flag in Init()
+ *
+ * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
+ * for a complete specification.
+ * @param DataType the datatype stored in the hashtable,
+ * for example, PRUint32 or nsCOMPtr. If UserDataType is not the same,
+ * DataType must implicitly cast to UserDataType
+ * @param UserDataType the user sees, for example PRUint32 or nsISupports*
+ */
+template<class KeyClass,class DataType,class UserDataType>
+class nsBaseHashtable :
+ protected nsTHashtable< nsBaseHashtableET<KeyClass,DataType> >
+{
+public:
+ typedef typename KeyClass::KeyType KeyType;
+ typedef nsBaseHashtableET<KeyClass,DataType> EntryType;
+
+ // default constructor+destructor are fine
+
+ /**
+ * Initialize the object.
+ * @param initSize the initial number of buckets in the hashtable,
+ * default 16
+ * @param threadSafe whether to provide read/write
+ * locking on all class methods
+ * @return PR_TRUE if the object was initialized properly.
+ */
+ PRBool Init(PRUint32 initSize = PL_DHASH_MIN_SIZE)
+ { return nsTHashtable<EntryType>::Init(initSize); }
+
+ /**
+ * Check whether the table has been initialized.
+ * This function is especially useful for static hashtables.
+ * @return PR_TRUE if the table has been initialized.
+ */
+ PRBool IsInitialized() const { return this->mTable.entrySize; }
+
+ /**
+ * Return the number of entries in the table.
+ * @return number of entries
+ */
+ PRUint32 Count() const
+ { return nsTHashtable<EntryType>::Count(); }
+
+ /**
+ * retrieve the value for a key.
+ * @param aKey the key to retreive
+ * @param pData data associated with this key will be placed at this
+ * pointer. If you only need to check if the key exists, pData
+ * may be null.
+ * @return PR_TRUE if the key exists. If key does not exist, pData is not
+ * modified.
+ */
+ PRBool Get(KeyType aKey, UserDataType* pData) const
+ {
+ EntryType* ent = this->GetEntry(aKey);
+
+ if (!ent)
+ return PR_FALSE;
+
+ if (pData)
+ *pData = ent->mData;
+
+ return PR_TRUE;
+ }
+
+ /**
+ * put a new value for the associated key
+ * @param aKey the key to put
+ * @param aData the new data
+ * @return always PR_TRUE, unless memory allocation failed
+ */
+ PRBool Put(KeyType aKey, UserDataType aData)
+ {
+ EntryType* ent = this->PutEntry(aKey);
+
+ if (!ent)
+ return PR_FALSE;
+
+ ent->mData = aData;
+
+ return PR_TRUE;
+ }
+
+ /**
+ * remove the data for the associated key
+ * @param aKey the key to remove from the hashtable
+ */
+ void Remove(KeyType aKey) { this->RemoveEntry(aKey); }
+
+ /**
+ * function type provided by the application for enumeration.
+ * @param aKey the key being enumerated
+ * @param aData data being enumerated
+ * @parm userArg passed unchanged from Enumerate
+ * @return either
+ * @link PLDHashOperator::PL_DHASH_NEXT PL_DHASH_NEXT @endlink or
+ * @link PLDHashOperator::PL_DHASH_STOP PL_DHASH_STOP @endlink
+ */
+ typedef PLDHashOperator
+ (*PR_CALLBACK EnumReadFunction)(KeyType aKey,
+ UserDataType aData,
+ void* userArg);
+
+ /**
+ * enumerate entries in the hashtable, without allowing changes
+ * this function read-locks the hashtable, so other threads may read keys
+ * at the same time in multi-thread environments.
+ * @param enumFunc enumeration callback
+ * @param userArg passed unchanged to the EnumReadFunction
+ */
+ PRUint32 EnumerateRead(EnumReadFunction enumFunc, void* userArg) const
+ {
+ NS_ASSERTION(this->mTable.entrySize,
+ "nsBaseHashtable was not initialized properly.");
+
+ s_EnumReadArgs enumData = { enumFunc, userArg };
+ return PL_DHashTableEnumerate(NS_CONST_CAST(PLDHashTable*, &this->mTable),
+ s_EnumReadStub,
+ &enumData);
+ }
+
+ /**
+ * function type provided by the application for enumeration.
+ * @param aKey the key being enumerated
+ * @param aData Reference to data being enumerated, may be altered. e.g. for
+ * nsInterfaceHashtable this is an nsCOMPtr reference...
+ * @parm userArg passed unchanged from Enumerate
+ * @return bitflag combination of
+ * @link PLDHashOperator::PL_DHASH_REMOVE @endlink,
+ * @link PLDHashOperator::PL_DHASH_NEXT PL_DHASH_NEXT @endlink, or
+ * @link PLDHashOperator::PL_DHASH_STOP PL_DHASH_STOP @endlink
+ */
+ typedef PLDHashOperator
+ (*PR_CALLBACK EnumFunction)(KeyType aKey,
+ DataType& aData,
+ void* userArg);
+
+ /**
+ * enumerate entries in the hashtable, allowing changes. This
+ * functions write-locks the hashtable.
+ * @param enumFunc enumeration callback
+ * @param userArg passed unchanged to the EnumFunction
+ */
+ PRUint32 Enumerate(EnumFunction enumFunc, void* userArg)
+ {
+ NS_ASSERTION(this->mTable.entrySize,
+ "nsBaseHashtable was not initialized properly.");
+
+ s_EnumArgs enumData = { enumFunc, userArg };
+ return PL_DHashTableEnumerate(&this->mTable,
+ s_EnumStub,
+ &enumData);
+ }
+
+ /**
+ * reset the hashtable, removing all entries
+ */
+ void Clear() { nsTHashtable<EntryType>::Clear(); }
+
+protected:
+ /**
+ * used internally during EnumerateRead. Allocated on the stack.
+ * @param func the enumerator passed to EnumerateRead
+ * @param userArg the userArg passed to EnumerateRead
+ */
+ struct s_EnumReadArgs
+ {
+ EnumReadFunction func;
+ void* userArg;
+ };
+
+ static PLDHashOperator s_EnumReadStub(PLDHashTable *table,
+ PLDHashEntryHdr *hdr,
+ PRUint32 number,
+ void *arg);
+
+ struct s_EnumArgs
+ {
+ EnumFunction func;
+ void* userArg;
+ };
+
+ static PLDHashOperator s_EnumStub(PLDHashTable *table,
+ PLDHashEntryHdr *hdr,
+ PRUint32 number,
+ void *arg);
+};
+
+/**
+ * This class is a thread-safe version of nsBaseHashtable.
+ */
+template<class KeyClass,class DataType,class UserDataType>
+class nsBaseHashtableMT :
+ protected nsBaseHashtable<KeyClass,DataType,UserDataType>
+{
+public:
+ typedef typename
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::EntryType EntryType;
+ typedef typename
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::KeyType KeyType;
+ typedef typename
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumFunction EnumFunction;
+ typedef typename
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumReadFunction EnumReadFunction;
+
+ nsBaseHashtableMT() : mLock(nsnull) { }
+ ~nsBaseHashtableMT();
+
+ PRBool Init(PRUint32 initSize = PL_DHASH_MIN_SIZE);
+ PRBool IsInitialized() const { return (PRBool) mLock; }
+ PRUint32 Count() const;
+ PRBool Get(KeyType aKey, UserDataType* pData) const;
+ PRBool Put(KeyType aKey, UserDataType aData);
+ void Remove(KeyType aKey);
+
+ PRUint32 EnumerateRead(EnumReadFunction enumFunc, void* userArg) const;
+ PRUint32 Enumerate(EnumFunction enumFunc, void* userArg);
+ void Clear();
+
+protected:
+ PRLock* mLock;
+};
+
+
+//
+// nsBaseHashtableET definitions
+//
+
+template<class KeyClass,class DataType>
+nsBaseHashtableET<KeyClass,DataType>::nsBaseHashtableET(KeyTypePointer aKey) :
+ KeyClass(aKey)
+{ }
+
+template<class KeyClass,class DataType>
+nsBaseHashtableET<KeyClass,DataType>::nsBaseHashtableET
+ (nsBaseHashtableET<KeyClass,DataType>& toCopy) :
+ KeyClass(toCopy),
+ mData(toCopy.mData)
+{ }
+
+template<class KeyClass,class DataType>
+nsBaseHashtableET<KeyClass,DataType>::~nsBaseHashtableET()
+{ }
+
+
+//
+// nsBaseHashtable definitions
+//
+
+template<class KeyClass,class DataType,class UserDataType>
+PLDHashOperator
+nsBaseHashtable<KeyClass,DataType,UserDataType>::s_EnumReadStub
+ (PLDHashTable *table, PLDHashEntryHdr *hdr, PRUint32 number, void* arg)
+{
+ EntryType* ent = NS_STATIC_CAST(EntryType*, hdr);
+ s_EnumReadArgs* eargs = (s_EnumReadArgs*) arg;
+
+ PLDHashOperator res = (eargs->func)(ent->GetKey(), ent->mData, eargs->userArg);
+
+ NS_ASSERTION( !(res & PL_DHASH_REMOVE ),
+ "PL_DHASH_REMOVE return during const enumeration; ignoring.");
+
+ if (res & PL_DHASH_STOP)
+ return PL_DHASH_STOP;
+
+ return PL_DHASH_NEXT;
+}
+
+template<class KeyClass,class DataType,class UserDataType>
+PLDHashOperator
+nsBaseHashtable<KeyClass,DataType,UserDataType>::s_EnumStub
+ (PLDHashTable *table, PLDHashEntryHdr *hdr, PRUint32 number, void* arg)
+{
+ EntryType* ent = NS_STATIC_CAST(EntryType*, hdr);
+ s_EnumArgs* eargs = (s_EnumArgs*) arg;
+
+ return (eargs->func)(ent->GetKey(), ent->mData, eargs->userArg);
+}
+
+
+//
+// nsBaseHashtableMT definitions
+//
+
+template<class KeyClass,class DataType,class UserDataType>
+nsBaseHashtableMT<KeyClass,DataType,UserDataType>::~nsBaseHashtableMT()
+{
+ if (this->mLock)
+ PR_DestroyLock(this->mLock);
+}
+
+template<class KeyClass,class DataType,class UserDataType>
+PRBool
+nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Init(PRUint32 initSize)
+{
+ if (!nsTHashtable<EntryType>::IsInitialized() && !nsTHashtable<EntryType>::Init(initSize))
+ return PR_FALSE;
+
+ this->mLock = PR_NewLock();
+ NS_WARN_IF_FALSE(this->mLock, "Error creating lock during nsBaseHashtableL::Init()");
+
+ return (this->mLock != nsnull);
+}
+
+template<class KeyClass,class DataType,class UserDataType>
+PRUint32
+nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Count() const
+{
+ PR_Lock(this->mLock);
+ PRUint32 count = nsTHashtable<EntryType>::Count();
+ PR_Unlock(this->mLock);
+
+ return count;
+}
+
+template<class KeyClass,class DataType,class UserDataType>
+PRBool
+nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Get(KeyType aKey,
+ UserDataType* pData) const
+{
+ PR_Lock(this->mLock);
+ PRBool res =
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::Get(aKey, pData);
+ PR_Unlock(this->mLock);
+
+ return res;
+}
+
+template<class KeyClass,class DataType,class UserDataType>
+PRBool
+nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Put(KeyType aKey,
+ UserDataType aData)
+{
+ PR_Lock(this->mLock);
+ PRBool res =
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::Put(aKey, aData);
+ PR_Unlock(this->mLock);
+
+ return res;
+}
+
+template<class KeyClass,class DataType,class UserDataType>
+void
+nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Remove(KeyType aKey)
+{
+ PR_Lock(this->mLock);
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::Remove(aKey);
+ PR_Unlock(this->mLock);
+}
+
+template<class KeyClass,class DataType,class UserDataType>
+PRUint32
+nsBaseHashtableMT<KeyClass,DataType,UserDataType>::EnumerateRead
+ (EnumReadFunction fEnumCall, void* userArg) const
+{
+ PR_Lock(this->mLock);
+ PRUint32 count =
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumerateRead(fEnumCall, userArg);
+ PR_Unlock(this->mLock);
+
+ return count;
+}
+
+template<class KeyClass,class DataType,class UserDataType>
+PRUint32
+nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Enumerate
+ (EnumFunction fEnumCall, void* userArg)
+{
+ PR_Lock(this->mLock);
+ PRUint32 count =
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::Enumerate(fEnumCall, userArg);
+ PR_Unlock(this->mLock);
+
+ return count;
+}
+
+template<class KeyClass,class DataType,class UserDataType>
+void
+nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Clear()
+{
+ PR_Lock(this->mLock);
+ nsBaseHashtable<KeyClass,DataType,UserDataType>::Clear();
+ PR_Unlock(this->mLock);
+}
+
+#endif // nsBaseHashtable_h__