diff options
Diffstat (limited to 'plugins/Dbx_tree/lockfree_hashmap.h')
| -rw-r--r-- | plugins/Dbx_tree/lockfree_hashmap.h | 749 |
1 files changed, 749 insertions, 0 deletions
diff --git a/plugins/Dbx_tree/lockfree_hashmap.h b/plugins/Dbx_tree/lockfree_hashmap.h new file mode 100644 index 0000000000..7ec2df3ce4 --- /dev/null +++ b/plugins/Dbx_tree/lockfree_hashmap.h @@ -0,0 +1,749 @@ +#pragma once
+
+/*
+
+lockfree hash-multi_map based on Ori Shalev and Nir Shavit
+
+implementation
+Copyright 2009-2010 Michael "Protogenes" Kunz
+
+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 02111-1307, USA.
+
+*/
+
+#pragma once
+
+#include <utility>
+#include "Hash.h"
+#include "intrinsics.h"
+
+#define NodePointer(listitem) ((PListItem)(((uintptr_t)(listitem)) & ~1))
+#define NodeMark(listitem) ((bool) (((uintptr_t)(listitem)) & 1))
+
+#define HashTablePtr(hashtable) ((PHashTable)(((uintptr_t)(hashtable)) & ~31))
+#define HashTableSize(hashtable) ((uint32_t)(((uintptr_t)(hashtable)) & 31))
+#define HashTable(tableptr, tablesize) ((void*)(((uintptr_t)(tableptr)) | ((tablesize) & 31)))
+
+#define GCSelection(Sentinel) ((Sentinel) >> 63)
+#define GCRefCount0(Sentinel) ((Sentinel) & 0x7fffffff)
+#define GCRefCount1(Sentinel) (((Sentinel) >> 32) & 0x7fffffff)
+#define GCMakeSentinel(Sel, RefCount0, RefCount1) ((((uint64_t)(Sel) & 1) << 63) | (((uint64_t)(RefCount1)) << 32) | ((uint64_t)(RefCount0)))
+
+#define GCRef0 (1)
+#define GCRef1 (0x0000000100000000)
+
+namespace lockfree
+{
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t) = Hash>
+ class hash_map
+ {
+ public:
+ typedef std::pair<TKey, TData> value_type;
+
+ private:
+ typedef struct TListItem
+ {
+ TListItem * volatile Next;
+ TListItem * volatile NextPurge;
+ volatile uint32_t Hash;
+ value_type Value;
+ } TListItem, *PListItem;
+
+ typedef struct THashTable
+ {
+ volatile PListItem Table[256];
+ } THashTable, *PHashTable;
+
+ typedef struct {
+ volatile uint64_t Sentinel;
+ volatile PListItem Purge0;
+ volatile PListItem Purge1;
+ } THashTableReferences;
+
+ THashTableReferences m_GarbageCollector;
+
+ volatile uint32_t m_Count;
+ void * volatile m_HashTableData;
+
+ PListItem listInsert(PListItem BucketNode, PListItem Node);
+ PListItem listDelete(PListItem BucketNode, uint32_t Hash, const TKey & Key);
+
+ PListItem listDelete(PListItem BucketNode, PListItem Node);
+
+ bool listFind(const PListItem BucketNode, const uint32_t Hash, const TKey & Key, const PListItem Node, volatile PListItem * & Prev, PListItem & Curr, PListItem & Next);
+
+ uint32_t getMask(uint32_t Size)
+ {
+ const uint32_t mask[32] = {
+ 0x80000000, 0xc0000000, 0xe0000000, 0xf0000000,
+ 0xf8000000, 0xfc000000, 0xfe000000, 0xff000000,
+ 0xff800000, 0xffc00000, 0xffe00000, 0xfff00000,
+ 0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000,
+ 0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000,
+ 0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00,
+ 0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0,
+ 0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff
+ };
+ return mask[Size - 1];
+ };
+
+ PHashTable makeNewTable()
+ {
+ void * block = malloc(sizeof(THashTable) + 32 + sizeof(void*));
+ PHashTable result = reinterpret_cast<PHashTable>((reinterpret_cast<uintptr_t>(block) + 31 + sizeof(void*)) & (~(uintptr_t)31));
+ *(reinterpret_cast<void**>(result)-1) = block;
+ memset(reinterpret_cast<void*>(result), 0, sizeof(THashTable));
+ return reinterpret_cast<PHashTable>(result);
+ };
+
+ void destroyTable(PHashTable Table)
+ {
+ free(*(reinterpret_cast<void**>(Table) - 1));
+ };
+
+ PListItem makeDummyNode(uint32_t Hash)
+ {
+ PListItem result = new TListItem;
+ result->Hash = Hash;
+ result->Next = NULL;
+ result->NextPurge = NULL;
+ return result;
+ };
+
+ bool DisposeNode(volatile PListItem * Prev, PListItem Curr, PListItem Next);
+
+ PListItem initializeBucket(uint32_t Bucket, uint32_t Mask);
+
+ PListItem getBucket(uint32_t Bucket);
+
+ void setBucket(uint32_t Bucket, PListItem Dummy);
+
+ void DeleteTable(void * Table, uint32_t Size)
+ {
+ if (Size > 8)
+ {
+ for (uint32_t i = 0; i < 256; ++i)
+ {
+ if (HashTablePtr(Table)->Table[i])
+ DeleteTable(HashTablePtr(Table)->Table[i], Size - 8);
+ }
+ }
+
+ destroyTable(HashTablePtr(Table));
+ };
+
+
+ int addRef(int GC = -1);
+ void delRef(int GC);
+
+ public:
+
+
+ class iterator
+ {
+ protected:
+ friend class hash_map<TKey, TData, FHash>;
+ PListItem m_Item;
+ typename hash_map<TKey, TData, FHash> * m_Owner;
+ int m_GC;
+
+ iterator(hash_map<TKey, TData, FHash> * Owner, PListItem Item, int GC)
+ : m_Owner(Owner)
+ {
+ m_GC = GC;
+ m_Item = Item;
+
+ while (m_Item && (!(m_Item->Hash & 1) || NodeMark(m_Item->Next)))
+ m_Item = NodePointer(m_Item->Next);
+
+ if (!m_Item && (m_GC != -1))
+ {
+ m_Owner->delRef(m_GC);
+ m_GC = -1;
+ }
+
+ };
+ public:
+ iterator(const iterator & Other)
+ : m_Owner(Other.m_Owner),
+ m_Item(Other.m_Item)
+ {
+ m_GC = -1;
+ if (Other.m_GC != -1)
+ m_GC = m_Owner->addRef(Other.m_GC);
+ };
+ ~iterator()
+ {
+ if (m_GC != -1)
+ m_Owner->delRef(m_GC);
+ };
+
+ operator bool() const
+ {
+ return m_Item != NULL;
+ };
+ bool operator !() const
+ {
+ return m_Item == NULL;
+ };
+
+ value_type * operator ->()
+ {
+ return &m_Item->Value;
+ };
+ value_type & operator *()
+ {
+ return m_Item->Value;
+ };
+
+ bool operator ==(iterator& Other)
+ {
+ return m_Item->Value.first == Other.m_Item->Value.first;
+ };
+ bool operator < (iterator & Other)
+ {
+ return m_Item->Value.first < Other.m_Item->Value.first;
+ };
+ bool operator > (iterator & Other)
+ {
+ return m_Item->Value.first > Other.m_Item->Value.first;
+ };
+
+ iterator& operator =(const iterator& Other)
+ {
+ m_Owner = Other.m_Owner;
+ m_Item = Other.m_Item;
+
+ if (Other.m_GC != m_GC)
+ {
+ if (m_GC != -1)
+ m_Owner->delRef(m_GC);
+
+ m_GC = Other.m_GC;
+
+ if (Other.m_GC != -1)
+ m_GC = m_Owner->addRef(Other.m_GC);
+
+ }
+
+ return *this;
+ };
+
+ iterator& operator ++() //pre ++i
+ {
+ if (!m_Item)
+ return *this;
+
+ int gc = m_GC;
+ m_GC = m_Owner->addRef();
+ do
+ {
+ m_Item = NodePointer(m_Item->Next);
+ } while (m_Item && (!(m_Item->Hash & 1) || NodeMark(m_Item->Next)));
+
+ m_Owner->delRef(gc);
+ if (!m_Item)
+ {
+ m_Owner->delRef(m_GC);
+ m_GC = -1;
+ }
+ return *this;
+ };
+ iterator operator ++(int) //post i++
+ {
+ iterator bak(*this);
+ ++(*this);
+ return bak;
+ };
+ };
+
+ iterator begin()
+ {
+ return iterator(this, getBucket(0), addRef());
+ };
+
+ iterator end()
+ {
+ return iterator(this, NULL, -1);
+ };
+
+ hash_map();
+ ~hash_map();
+
+ std::pair<iterator, bool> insert(const value_type & Val);
+
+ iterator find(const TKey & Key);
+
+ iterator erase(const iterator & Where);
+
+ size_t erase(const TKey & Key);
+
+ };
+
+ ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ int hash_map<TKey, TData, FHash>::addRef(int GC = -1)
+ {
+ uint64_t old;
+ uint64_t newvalue;
+ int res;
+ do {
+ old = m_GarbageCollector.Sentinel;
+ if (GC == 0) // this is safe because refcount will never fall to zero because of the original reference
+ {
+ newvalue = old + GCRef0;
+ res = 0;
+ } else if (GC == 1)
+ {
+ newvalue = old + GCRef1;
+ res = 1;
+ } else {
+ if (GCSelection(old))
+ {
+ newvalue = old + GCRef1;
+ res = 1;
+ } else {
+ newvalue = old + GCRef0;
+ res = 0;
+ }
+ }
+ }
+ while (CMPXCHG_64(m_GarbageCollector.Sentinel, newvalue, old) != old);
+
+ return res;
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ void hash_map<TKey, TData, FHash>::delRef(int GC)
+ {
+ uint64_t old;
+ uint64_t newvalue;
+ PListItem purge = NULL;
+ do {
+ old = m_GarbageCollector.Sentinel;
+ if (GC)
+ {
+ newvalue = old - GCRef1;
+
+ if (!GCSelection(old) && (GCRefCount1(old) == 1)) // the other gc is activated and we are the last one
+ {
+ if (!purge) // check if we had to loop...
+ purge = m_GarbageCollector.Purge1;
+
+ m_GarbageCollector.Purge1 = NULL;
+ }
+
+ } else {
+ newvalue = old - GCRef0;
+
+ if (GCSelection(old) && (GCRefCount0(old) == 1)) // the other gc is activated and we are the last one
+ {
+ if (!purge) // check if we had to loop...
+ purge = m_GarbageCollector.Purge0;
+
+ m_GarbageCollector.Purge0 = NULL;
+ }
+
+ }
+ } while (CMPXCHG_64(m_GarbageCollector.Sentinel, newvalue, old) != old);
+
+ purge = NodePointer(purge);
+ while (purge)
+ {
+ PListItem tmp = purge;
+ purge = purge->NextPurge;
+ delete tmp;
+ };
+ };
+
+
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ bool hash_map<TKey, TData, FHash>::DisposeNode(volatile PListItem * Prev, PListItem Curr, PListItem Next)
+ {
+ if (NodePointer(Curr) == CMPXCHG_Ptr(*Prev, NodePointer(Next), NodePointer(Curr)))
+ {
+ uint64_t old = m_GarbageCollector.Sentinel;
+ PListItem del = NodePointer(Curr);
+
+ if (GCSelection(old))
+ {
+ del->NextPurge = (PListItem)XCHG_Ptr(m_GarbageCollector.Purge1, del);
+
+ if (!GCRefCount0(old))
+ BTR_64(m_GarbageCollector.Sentinel, 63); // switch
+
+ } else {
+
+ del->NextPurge = (PListItem)XCHG_Ptr(m_GarbageCollector.Purge0, del);
+
+ if (!GCRefCount1(old))
+ BTS_64(m_GarbageCollector.Sentinel, 63); // switch
+
+ }
+ return true;
+ }
+
+ return false;
+ };
+
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ typename hash_map<TKey, TData, FHash>::PListItem hash_map<TKey, TData, FHash>::listInsert(PListItem BucketNode, PListItem Node)
+ {
+ PListItem volatile * prev;
+ PListItem curr, next;
+ do
+ {
+ if (listFind(BucketNode, Node->Hash, Node->Value.first, NULL, prev, curr, next))
+ return NodePointer(curr);
+
+ Node->Next = NodePointer(curr);
+
+ } while (NodePointer(curr) != CMPXCHG_Ptr(*prev, Node, NodePointer(curr)));
+ return Node;
+ };
+
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ typename hash_map<TKey, TData, FHash>::PListItem hash_map<TKey, TData, FHash>::listDelete(PListItem BucketNode, uint32_t Hash, const TKey & Key)
+ {
+ PListItem volatile * prev;
+ PListItem curr, next;
+
+ if (!listFind(BucketNode, Hash, Key, NULL, prev, curr, next))
+ return NodePointer(curr);
+
+ do
+ {
+ if (!listFind(BucketNode, Hash, Key, NULL, prev, curr, next))
+ return NodePointer(curr);
+
+ } while (NodePointer(next) != CMPXCHG_Ptr(curr->Next, (PListItem)((uintptr_t)next | 1), NodePointer(next)));
+
+ if (!DisposeNode(prev, curr, next))
+ listFind(BucketNode, Hash, Key, NULL, prev, curr, next); // cleanup
+
+ return NodePointer(curr);
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ typename hash_map<TKey, TData, FHash>::PListItem hash_map<TKey, TData, FHash>::listDelete(PListItem BucketNode, PListItem Node)
+ {
+ PListItem volatile * prev;
+ PListItem curr, next;
+ if (!listFind(BucketNode, Node->Hash, Node->Value.first, Node, prev, curr, next))
+ return NodePointer(curr);
+
+ do
+ {
+ if (!listFind(BucketNode, Node->Hash, Node->Value.first, Node, prev, curr, next))
+ return NodePointer(curr);
+
+ } while (NodePointer(next) != CMPXCHG_Ptr(curr->Next, (PListItem)((uintptr_t)next | 1), NodePointer(next)));
+
+ if (!DisposeNode(prev, curr, next))
+ listFind(BucketNode, Node->Hash, Node->Value.first, Node, prev, curr, next); // cleanup
+
+ return NodePointer(curr);
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ bool hash_map<TKey, TData, FHash>::listFind(const PListItem BucketNode, const uint32_t Hash, const TKey & Key, const PListItem Node, volatile PListItem * & Prev, PListItem & Curr, PListItem & Next)
+ {
+tryagain:
+ Prev = &(BucketNode->Next);
+ Curr = *Prev;
+ do
+ {
+ if (NodePointer(Curr) == NULL)
+ return false;
+
+ Next = NodePointer(Curr)->Next;
+ uint32_t h = NodePointer(Curr)->Hash;
+
+ if (*Prev != NodePointer(Curr))
+ goto tryagain; // don't judge me for that
+ //return listFind(BucketNode, Hash, Key, Node, Prev, Curr, Next); // it's the same but stack overflow can happen
+
+ if (!NodeMark(Next))
+ {
+ if (Node)
+ {
+ if ((h > Hash) || (Node == NodePointer(Curr)))
+ return NodePointer(Curr) == Node;
+ }
+ else if ((h > Hash) || ((h == Hash) && !(NodePointer(Curr)->Value.first < Key)))
+ {
+ return (h == Hash) && (NodePointer(Curr)->Value.first == Key);
+ }
+
+ Prev = &(NodePointer(Curr)->Next);
+ } else {
+ if (!DisposeNode(Prev, Curr, Next))
+ goto tryagain; // don't judge me for that
+ //return listFind(BucketNode, Hash, Key, Node, Prev, Curr, Next); // it's the same but stack overflow can happen
+ }
+ Curr = Next;
+ } while (true);
+
+ };
+
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ typename hash_map<TKey, TData, FHash>::PListItem hash_map<TKey, TData, FHash>::initializeBucket(uint32_t Bucket, uint32_t Mask)
+ {
+ uint32_t parent = Bucket & (Mask << 1);
+ PListItem parentnode = getBucket(parent);
+ if (parentnode == NULL)
+ parentnode = initializeBucket(parent, Mask << 1);
+
+ PListItem dummy = makeDummyNode(Bucket);
+ PListItem bucketnode = listInsert(parentnode, dummy);
+ if (bucketnode != dummy)
+ {
+ delete dummy;
+ dummy = bucketnode;
+ }
+ setBucket(Bucket, dummy);
+
+ return dummy;
+ }
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ typename hash_map<TKey, TData, FHash>::PListItem hash_map<TKey, TData, FHash>::getBucket(uint32_t Bucket)
+ {
+ void * table;
+ uint32_t mask;
+
+ table = (void*)m_HashTableData;
+ mask = getMask(HashTableSize(table));
+
+ uint32_t levelshift = (32 - HashTableSize(table)) & ~7;
+
+ while (levelshift < 24)
+ {
+ table = HashTablePtr(table)->Table[((Bucket & mask) >> levelshift) & 0xff];
+ levelshift = levelshift + 8;
+ if (!HashTablePtr(table))
+ return NULL;
+ }
+ return HashTablePtr(table)->Table[(Bucket & mask) >> 24];
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ void hash_map<TKey, TData, FHash>::setBucket(uint32_t Bucket, PListItem Dummy)
+ {
+ void * table;
+ void *volatile * last;
+ uint32_t mask;
+
+ table = m_HashTableData;
+ mask = getMask(HashTableSize(table));
+
+ uint32_t levelshift = (32 - HashTableSize(table)) & ~7;
+
+ while (levelshift < 24)
+ {
+ last = (void*volatile*)&HashTablePtr(table)->Table[((Bucket & mask) >> levelshift) & 0xff];
+ table = *last;
+ levelshift = levelshift + 8;
+ if (!table)
+ {
+ PHashTable newtable = makeNewTable();
+ table = CMPXCHG_Ptr<void>(*last, newtable, NULL);
+ if (table)
+ {
+ destroyTable(newtable);
+ } else {
+ table = newtable;
+ }
+ }
+ }
+ HashTablePtr(table)->Table[(Bucket & mask) >> 24] = Dummy;
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ hash_map<TKey, TData, FHash>::hash_map()
+ {
+ m_Count = 0;
+
+ m_GarbageCollector.Sentinel = GCMakeSentinel(0,0,0);
+ m_GarbageCollector.Purge0 = NULL;
+ m_GarbageCollector.Purge1 = NULL;
+
+ m_HashTableData = HashTable(makeNewTable(), 1);
+ setBucket(0x00000000, makeDummyNode(0x00000000));
+ setBucket(0x80000000, makeDummyNode(0x80000000));
+ HashTablePtr(m_HashTableData)->Table[0]->Next = getBucket(0x80000000);
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ hash_map<TKey, TData, FHash>::~hash_map()
+ {
+ PListItem h = getBucket(0);
+ DeleteTable(HashTablePtr(m_HashTableData), HashTableSize(m_HashTableData));
+
+ while (h)
+ {
+ PListItem tmp = h;
+ h = NodePointer(h->Next);
+ delete tmp;
+ };
+
+ h = m_GarbageCollector.Purge0;
+ while (h)
+ {
+ PListItem tmp = h;
+ h = h->NextPurge;
+ delete tmp;
+ };
+
+ h = m_GarbageCollector.Purge1;
+ while (h)
+ {
+ PListItem tmp = h;
+ h = h->NextPurge;
+ delete tmp;
+ };
+
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ typename std::pair<typename hash_map<TKey, TData, FHash>::iterator, bool> hash_map<TKey, TData, FHash>::insert(const value_type & Val)
+ {
+ int gc = addRef();
+ PListItem node = new TListItem;
+ node->Value = Val;
+ node->Hash = FHash(&node->Value.first, sizeof(TKey)) | 1;
+ node->NextPurge = NULL;
+ node->Next = NULL;
+
+ void * tmp;
+ void * newdata;
+ tmp = (void*)m_HashTableData;
+
+ uint32_t mask = getMask(HashTableSize(tmp));
+
+ uint32_t bucket = node->Hash & mask;
+ PListItem bucketnode = getBucket(bucket);
+
+ if (bucketnode == NULL)
+ bucketnode = initializeBucket(bucket, mask);
+ PListItem retnode = listInsert(bucketnode, node);
+ if (retnode != node)
+ {
+ delete node;
+ return std::make_pair(iterator(this, retnode, gc), false);
+ }
+
+ if ((INC_32(m_Count) > ((uint32_t)1 << (HashTableSize(tmp) + 3))) && (HashTableSize(tmp) < 31) && (HashTableSize(tmp) == HashTableSize(m_HashTableData)))
+ {
+ newdata = HashTable(HashTablePtr(tmp), HashTableSize(tmp) + 1);
+
+ if ((HashTableSize(tmp) & 0x7) == 0)
+ {
+ newdata = HashTable(makeNewTable(), HashTableSize(tmp) + 1);
+ HashTablePtr(newdata)->Table[0] = (TListItem*)HashTablePtr(tmp);
+
+ if (tmp != CMPXCHG_Ptr(m_HashTableData, newdata, tmp))
+ destroyTable(HashTablePtr(newdata)); // someone else expanded the table.
+ } else {
+ CMPXCHG_Ptr(m_HashTableData, newdata, tmp);
+ }
+
+ }
+
+ return std::make_pair(iterator(this, node, gc), true);
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ typename hash_map<TKey, TData, FHash>::iterator hash_map<TKey, TData, FHash>::find(const TKey & Key)
+ {
+ int gc = addRef();
+ uint32_t hash = FHash(&Key, sizeof(TKey)) | 1;
+ uint32_t mask = getMask(HashTableSize(m_HashTableData));
+ uint32_t bucket = hash & mask;
+ PListItem bucketnode = getBucket(bucket);
+ if (bucketnode == NULL)
+ bucketnode = initializeBucket(bucket, mask);
+
+ PListItem volatile * prev;
+ PListItem curr, next;
+ if (listFind(bucketnode, hash, Key, NULL, prev, curr, next))
+ return iterator(this, NodePointer(curr), gc);
+
+ return iterator(this, NULL, gc);
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ typename hash_map<TKey, TData, FHash>::iterator hash_map<TKey, TData, FHash>::erase(const iterator & Where)
+ {
+ int gc = addRef();
+ uint32_t hash = Where.m_Item->Hash;
+ uint32_t mask = getMask(HashTableSize(m_HashTableData));
+ uint32_t bucket = hash & mask;
+ PListItem bucketnode = getBucket(bucket);
+
+ if (bucketnode == NULL)
+ bucketnode = initializeBucket(bucket, mask);
+
+ PListItem res = listDelete(bucketnode, Where.m_Item);
+ if (Where.m_Item == res)
+ {
+ DEC_32(m_Count);
+ return iterator(this, NodePointer(res->Next), gc);
+ }
+ return iterator(this, res, gc);
+ };
+
+ template <typename TKey, typename TData, uint32_t (*FHash)(const void *, uint32_t)>
+ size_t hash_map<TKey, TData, FHash>::erase(const TKey & Key)
+ {
+ int gc = addRef();
+ uint32_t hash = FHash(&Key, sizeof(TKey)) | 1;
+ uint32_t mask = getMask(HashTableSize(m_HashTableData));
+ uint32_t bucket = hash & mask;
+ PListItem bucketnode = getBucket(bucket);
+
+ if (bucketnode == NULL)
+ bucketnode = initializeBucket(bucket, mask);
+
+ PListItem result = listDelete(bucketnode, hash, Key);
+ if (result && (result->Value.first == Key))
+ {
+ DEC_32(m_Count);
+ delRef(gc);
+ return 1;
+ }
+
+ delRef(gc);
+ return 0;
+ };
+}
+
+#undef NodePointer
+#undef NodeMark
+
+#undef HashTablePtr
+#undef HashTableSize
+#undef HashTable
+
+#undef GCSelection
+#undef GCRefCount0
+#undef GCRefCount1
+#undef GCMakeSentinel
+
|