From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 erts/emulator/beam/erl_db_hash.h | 103 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 erts/emulator/beam/erl_db_hash.h

(limited to 'erts/emulator/beam/erl_db_hash.h')

diff --git a/erts/emulator/beam/erl_db_hash.h b/erts/emulator/beam/erl_db_hash.h
new file mode 100644
index 0000000000..e0285fa5ed
--- /dev/null
+++ b/erts/emulator/beam/erl_db_hash.h
@@ -0,0 +1,103 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 1998-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * 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.
+ * 
+ * %CopyrightEnd%
+ */
+
+#ifndef _DB_HASH_H
+#define _DB_HASH_H
+
+#include "erl_db_util.h" /* DbTerm & DbTableCommon */
+
+typedef struct fixed_deletion {
+    int slot;
+    struct fixed_deletion *next;
+} FixedDeletion;
+
+typedef struct hash_db_term {
+    struct  hash_db_term* next;  /* next bucket */
+    HashValue  hvalue;        /* stored hash value */
+    DbTerm dbterm;         /* The actual term */
+} HashDbTerm;
+
+#define DB_HASH_LOCK_CNT 16
+typedef struct db_table_hash_fine_locks {
+    union {
+	erts_smp_rwmtx_t lck;
+	byte _cache_line_alignment[64];
+    }lck_vec[DB_HASH_LOCK_CNT];
+} DbTableHashFineLocks;
+
+typedef struct db_table_hash {
+    DbTableCommon common;
+
+    erts_smp_atomic_t segtab;  /* The segment table (struct segment**) */
+    erts_smp_atomic_t szm;     /* current size mask. */
+    
+    /* SMP: nslots and nsegs are protected by is_resizing or table write lock */
+    int nslots;       /* Total number of slots */
+    int nsegs;        /* Size of segment table */
+
+    /* List of slots where elements have been deleted while table was fixed */
+    erts_smp_atomic_t fixdel;  /* (FixedDeletion*) */	
+    erts_smp_atomic_t nactive; /* Number of "active" slots */
+    erts_smp_atomic_t is_resizing; /* grow/shrink in progress */
+#ifdef ERTS_SMP
+    DbTableHashFineLocks* locks;
+#endif
+} DbTableHash;
+
+
+/*
+** Function prototypes, looks the same (except the suffix) for all 
+** table types. The process is always an [in out] parameter.
+*/
+void db_initialize_hash(void);
+void db_unfix_table_hash(DbTableHash *tb /* [in out] */);
+Uint db_kept_items_hash(DbTableHash *tb);
+
+/* Interface for meta pid table */
+int db_create_hash(Process *p, 
+		   DbTable *tbl /* [in out] */);
+
+int db_put_hash(DbTable *tbl, Eterm obj, int key_clash_fail);
+
+int db_get_hash(Process *p, DbTable *tbl, Eterm key, Eterm *ret);
+
+int db_erase_hash(DbTable *tbl, Eterm key, Eterm *ret);
+
+int db_get_element_array(DbTable *tbl, 
+			 Eterm key,
+			 int ndex, 
+			 Eterm *ret,
+			 int *num_ret); 
+
+int db_erase_bag_exact2(DbTable *tbl, Eterm key, Eterm value);
+
+/* not yet in method table */
+int db_mark_all_deleted_hash(DbTable *tbl);
+
+typedef struct {
+    float avg_chain_len;
+    float std_dev_chain_len;
+    float std_dev_expected;
+    int max_chain_len;
+    int min_chain_len;
+}DbHashStats;
+
+void db_calc_stats_hash(DbTableHash* tb, DbHashStats*);
+
+#endif /* _DB_HASH_H */
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