WL#3230 concurrent hash

Backport from 6.0.14 to 5.6.0

Original code from Sergei Golubchik

1 files changed, 268 insertions, 0 deletions

diff --git a/include/lf.h b/include/lf.h
new file mode 100644
index 00000000000..7e8f05f4ada
--- /dev/null
+++ b/include/lf.h
@@ -0,0 +1,268 @@
+/* Copyright (C) 2007-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
+
+   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; version 2 of the License.
+
+   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 */
+
+#ifndef _lf_h
+#define _lf_h
+
+#include <my_atomic.h>
+
+C_MODE_START
+
+/*
+  Helpers to define both func() and _func(), where
+  func() is a _func() protected by my_atomic_rwlock_wrlock()
+*/
+
+#define lock_wrap(f, t, proto_args, args, lock) \
+t _ ## f proto_args;                            \
+static inline t f  proto_args                   \
+{                                               \
+  t ret;                                        \
+  my_atomic_rwlock_wrlock(lock);                \
+  ret= _ ## f args;                             \
+  my_atomic_rwlock_wrunlock(lock);              \
+  return ret;                                   \
+}
+
+#define lock_wrap_void(f, proto_args, args, lock) \
+void _ ## f proto_args;                         \
+static inline void f proto_args                 \
+{                                               \
+  my_atomic_rwlock_wrlock(lock);                \
+  _ ## f args;                                  \
+  my_atomic_rwlock_wrunlock(lock);              \
+}
+
+#define nolock_wrap(f, t, proto_args, args)     \
+t _ ## f proto_args;                            \
+static inline t f  proto_args                   \
+{                                               \
+  return _ ## f args;                           \
+}
+
+#define nolock_wrap_void(f, proto_args, args)   \
+void _ ## f proto_args;                         \
+static inline void f proto_args                 \
+{                                               \
+  _ ## f args;                                  \
+}
+
+/*
+  wait-free dynamic array, see lf_dynarray.c
+
+  4 levels of 256 elements each mean 4311810304 elements in an array - it
+  should be enough for a while
+*/
+#define LF_DYNARRAY_LEVEL_LENGTH 256
+#define LF_DYNARRAY_LEVELS       4
+
+typedef struct {
+  void * volatile level[LF_DYNARRAY_LEVELS];
+  uint size_of_element;
+  my_atomic_rwlock_t lock;
+} LF_DYNARRAY;
+
+typedef int (*lf_dynarray_func)(void *, void *);
+
+void lf_dynarray_init(LF_DYNARRAY *array, uint element_size);
+void lf_dynarray_destroy(LF_DYNARRAY *array);
+
+nolock_wrap(lf_dynarray_value, void *,
+            (LF_DYNARRAY *array, uint idx),
+            (array, idx))
+lock_wrap(lf_dynarray_lvalue, void *,
+          (LF_DYNARRAY *array, uint idx),
+          (array, idx),
+          &array->lock)
+nolock_wrap(lf_dynarray_iterate, int,
+            (LF_DYNARRAY *array, lf_dynarray_func func, void *arg),
+            (array, func, arg))
+
+/*
+  pin manager for memory allocator, lf_alloc-pin.c
+*/
+
+#define LF_PINBOX_PINS 4
+#define LF_PURGATORY_SIZE 10
+
+typedef void lf_pinbox_free_func(void *, void *, void*);
+
+typedef struct {
+  LF_DYNARRAY pinarray;
+  lf_pinbox_free_func *free_func;
+  void *free_func_arg;
+  uint free_ptr_offset;
+  uint32 volatile pinstack_top_ver;         /* this is a versioned pointer */
+  uint32 volatile pins_in_array;            /* number of elements in array */
+} LF_PINBOX;
+
+typedef struct {
+  void * volatile pin[LF_PINBOX_PINS];
+  LF_PINBOX *pinbox;
+  void  **stack_ends_here;
+  void  *purgatory;
+  uint32 purgatory_count;
+  uint32 volatile link;
+/* we want sizeof(LF_PINS) to be 64 to avoid false sharing */
+#if SIZEOF_INT*2+SIZEOF_CHARP*(LF_PINBOX_PINS+3) != 64
+  char pad[64-sizeof(uint32)*2-sizeof(void*)*(LF_PINBOX_PINS+3)];
+#endif
+} LF_PINS;
+
+/*
+  shortcut macros to do an atomic_wrlock on a structure that uses pins
+  (e.g. lf_hash).
+*/
+#define lf_rwlock_by_pins(PINS)   \
+  my_atomic_rwlock_wrlock(&(PINS)->pinbox->pinarray.lock)
+#define lf_rwunlock_by_pins(PINS) \
+  my_atomic_rwlock_wrunlock(&(PINS)->pinbox->pinarray.lock)
+
+/*
+  compile-time assert, to require "no less than N" pins
+  it's enough if it'll fail on at least one compiler, so
+  we'll enable it on GCC only, which supports zero-length arrays.
+*/
+#if defined(__GNUC__) && defined(MY_LF_EXTRA_DEBUG)
+#define LF_REQUIRE_PINS(N)                                      \
+  static const char require_pins[LF_PINBOX_PINS-N]              \
+                             __attribute__ ((unused));          \
+  static const int LF_NUM_PINS_IN_THIS_FILE= N;
+#define _lf_pin(PINS, PIN, ADDR)                                \
+  (                                                             \
+    assert(PIN < LF_NUM_PINS_IN_THIS_FILE),                     \
+    my_atomic_storeptr(&(PINS)->pin[PIN], (ADDR))               \
+  )
+#else
+#define LF_REQUIRE_PINS(N)
+#define _lf_pin(PINS, PIN, ADDR)  my_atomic_storeptr(&(PINS)->pin[PIN], (ADDR))
+#endif
+
+#define _lf_unpin(PINS, PIN)      _lf_pin(PINS, PIN, NULL)
+#define lf_pin(PINS, PIN, ADDR)   \
+  do {                            \
+    lf_rwlock_by_pins(PINS);      \
+    _lf_pin(PINS, PIN, ADDR);     \
+    lf_rwunlock_by_pins(PINS);    \
+  } while (0)
+#define lf_unpin(PINS, PIN)  lf_pin(PINS, PIN, NULL)
+#define _lf_assert_pin(PINS, PIN) assert((PINS)->pin[PIN] != 0)
+#define _lf_assert_unpin(PINS, PIN) assert((PINS)->pin[PIN] == 0)
+
+void lf_pinbox_init(LF_PINBOX *pinbox, uint free_ptr_offset,
+                    lf_pinbox_free_func *free_func, void * free_func_arg);
+void lf_pinbox_destroy(LF_PINBOX *pinbox);
+
+lock_wrap(lf_pinbox_get_pins, LF_PINS *,
+          (LF_PINBOX *pinbox),
+          (pinbox),
+          &pinbox->pinarray.lock)
+lock_wrap_void(lf_pinbox_put_pins,
+               (LF_PINS *pins),
+               (pins),
+               &pins->pinbox->pinarray.lock)
+lock_wrap_void(lf_pinbox_free,
+               (LF_PINS *pins, void *addr),
+               (pins, addr),
+               &pins->pinbox->pinarray.lock)
+
+/*
+  memory allocator, lf_alloc-pin.c
+*/
+
+typedef struct st_lf_allocator {
+  LF_PINBOX pinbox;
+  uchar * volatile top;
+  uint element_size;
+  uint32 volatile mallocs;
+  void (*constructor)(uchar *); /* called, when an object is malloc()'ed */
+  void (*destructor)(uchar *);  /* called, when an object is free()'d    */
+} LF_ALLOCATOR;
+
+void lf_alloc_init(LF_ALLOCATOR *allocator, uint size, uint free_ptr_offset);
+void lf_alloc_destroy(LF_ALLOCATOR *allocator);
+uint lf_alloc_pool_count(LF_ALLOCATOR *allocator);
+/*
+  shortcut macros to access underlying pinbox functions from an LF_ALLOCATOR
+  see _lf_pinbox_get_pins() and _lf_pinbox_put_pins()
+*/
+#define _lf_alloc_free(PINS, PTR)     _lf_pinbox_free((PINS), (PTR))
+#define lf_alloc_free(PINS, PTR)       lf_pinbox_free((PINS), (PTR))
+#define _lf_alloc_get_pins(A)         _lf_pinbox_get_pins(&(A)->pinbox)
+#define lf_alloc_get_pins(A)           lf_pinbox_get_pins(&(A)->pinbox)
+#define _lf_alloc_put_pins(PINS)      _lf_pinbox_put_pins(PINS)
+#define lf_alloc_put_pins(PINS)        lf_pinbox_put_pins(PINS)
+#define lf_alloc_direct_free(ALLOC, ADDR) my_free((uchar*)(ADDR), MYF(0))
+
+lock_wrap(lf_alloc_new, void *,
+          (LF_PINS *pins),
+          (pins),
+          &pins->pinbox->pinarray.lock)
+
+C_MODE_END
+
+/*
+  extendible hash, lf_hash.c
+*/
+#include <hash.h>
+
+C_MODE_START
+
+#define LF_HASH_UNIQUE 1
+
+/* lf_hash overhead per element (that is, sizeof(LF_SLIST) */
+extern const int LF_HASH_OVERHEAD;
+
+typedef struct {
+  LF_DYNARRAY array;                    /* hash itself */
+  LF_ALLOCATOR alloc;                   /* allocator for elements */
+  my_hash_get_key get_key;              /* see HASH */
+  CHARSET_INFO *charset;                /* see HASH */
+  uint key_offset, key_length;          /* see HASH */
+  uint element_size;                    /* size of memcpy'ed area on insert */
+  uint flags;                           /* LF_HASH_UNIQUE, etc */
+  int32 volatile size;                  /* size of array */
+  int32 volatile count;                 /* number of elements in the hash */
+} LF_HASH;
+
+void lf_hash_init(LF_HASH *hash, uint element_size, uint flags,
+                  uint key_offset, uint key_length, my_hash_get_key get_key,
+                  CHARSET_INFO *charset);
+void lf_hash_destroy(LF_HASH *hash);
+int lf_hash_insert(LF_HASH *hash, LF_PINS *pins, const void *data);
+void *lf_hash_search(LF_HASH *hash, LF_PINS *pins, const void *key, uint keylen);
+int lf_hash_delete(LF_HASH *hash, LF_PINS *pins, const void *key, uint keylen);
+/*
+  shortcut macros to access underlying pinbox functions from an LF_HASH
+  see _lf_pinbox_get_pins() and _lf_pinbox_put_pins()
+*/
+#define _lf_hash_get_pins(HASH)     _lf_alloc_get_pins(&(HASH)->alloc)
+#define lf_hash_get_pins(HASH)       lf_alloc_get_pins(&(HASH)->alloc)
+#define _lf_hash_put_pins(PINS)     _lf_pinbox_put_pins(PINS)
+#define lf_hash_put_pins(PINS)       lf_pinbox_put_pins(PINS)
+#define lf_hash_search_unpin(PINS)   lf_unpin((PINS), 2)
+/*
+  cleanup
+*/
+
+#undef lock_wrap_void
+#undef lock_wrap
+#undef nolock_wrap_void
+#undef nolock_wrap
+
+C_MODE_END
+
+#endif
+