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5750daa4cf
And reducing the time taken by my_atomic-t. include/lf.h: fix to be able to add a ";" at the end of the macro's invokation (removing it here, removes a warning from "gcc -ansi" about a standalone ";"). mysys/lf_hash.c: ";" is ok now after LF_REQUIRE_PINS mysys/mf_pagecache.c: comment fix unittest/mysys/my_atomic-t.c: decreasing number of iterations to make test take less time.
257 lines
8.6 KiB
C
257 lines
8.6 KiB
C
/* Copyright (C) 2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef _lf_h
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#define _lf_h
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#include <my_atomic.h>
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/*
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Helpers to define both func() and _func(), where
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func() is a _func() protected by my_atomic_rwlock_wrlock()
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*/
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#define lock_wrap(f, t, proto_args, args, lock) \
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t _ ## f proto_args; \
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static inline t f proto_args \
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{ \
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t ret; \
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my_atomic_rwlock_wrlock(lock); \
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ret= _ ## f args; \
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my_atomic_rwlock_wrunlock(lock); \
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return ret; \
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}
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#define lock_wrap_void(f, proto_args, args, lock) \
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void _ ## f proto_args; \
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static inline void f proto_args \
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{ \
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my_atomic_rwlock_wrlock(lock); \
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_ ## f args; \
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my_atomic_rwlock_wrunlock(lock); \
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}
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#define nolock_wrap(f, t, proto_args, args) \
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t _ ## f proto_args; \
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static inline t f proto_args \
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{ \
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return _ ## f args; \
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}
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#define nolock_wrap_void(f, proto_args, args) \
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void _ ## f proto_args; \
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static inline void f proto_args \
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{ \
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_ ## f args; \
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}
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/*
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wait-free dynamic array, see lf_dynarray.c
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4 levels of 256 elements each mean 4311810304 elements in an array - it
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should be enough for a while
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*/
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#define LF_DYNARRAY_LEVEL_LENGTH 256
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#define LF_DYNARRAY_LEVELS 4
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typedef struct {
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void * volatile level[LF_DYNARRAY_LEVELS];
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uint size_of_element;
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my_atomic_rwlock_t lock;
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} LF_DYNARRAY;
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typedef int (*lf_dynarray_func)(void *, void *);
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void lf_dynarray_init(LF_DYNARRAY *array, uint element_size);
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void lf_dynarray_destroy(LF_DYNARRAY *array);
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nolock_wrap(lf_dynarray_value, void *,
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(LF_DYNARRAY *array, uint idx),
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(array, idx))
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lock_wrap(lf_dynarray_lvalue, void *,
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(LF_DYNARRAY *array, uint idx),
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(array, idx),
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&array->lock)
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nolock_wrap(lf_dynarray_iterate, int,
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(LF_DYNARRAY *array, lf_dynarray_func func, void *arg),
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(array, func, arg))
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/*
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pin manager for memory allocator, lf_alloc-pin.c
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*/
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#define LF_PINBOX_PINS 4
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#define LF_PURGATORY_SIZE 10
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typedef void lf_pinbox_free_func(void *, void *);
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typedef struct {
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LF_DYNARRAY pinstack;
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lf_pinbox_free_func *free_func;
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void *free_func_arg;
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uint free_ptr_offset;
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uint32 volatile pinstack_top_ver; /* this is a versioned pointer */
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uint32 volatile pins_in_stack; /* number of elements in array */
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} LF_PINBOX;
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typedef struct {
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void * volatile pin[LF_PINBOX_PINS];
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LF_PINBOX *pinbox;
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void *purgatory;
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uint32 purgatory_count;
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uint32 volatile link;
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/* we want sizeof(LF_PINS) to be 128 to avoid false sharing */
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char pad[128-sizeof(uint32)*2
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-sizeof(LF_PINBOX *)
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-sizeof(void *)*(LF_PINBOX_PINS+1)];
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} LF_PINS;
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/*
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shortcut macros to do an atomic_wrlock on a structure that uses pins
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(e.g. lf_hash).
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*/
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#define lf_rwlock_by_pins(PINS) \
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my_atomic_rwlock_wrlock(&(PINS)->pinbox->pinstack.lock)
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#define lf_rwunlock_by_pins(PINS) \
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my_atomic_rwlock_wrunlock(&(PINS)->pinbox->pinstack.lock)
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/*
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compile-time assert, to require "no less than N" pins
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it's enough if it'll fail on at least one compiler, so
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we'll enable it on GCC only, which supports zero-length arrays.
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*/
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#if defined(__GNUC__) && defined(MY_LF_EXTRA_DEBUG)
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#define LF_REQUIRE_PINS(N) \
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static const char require_pins[LF_PINBOX_PINS-N]; \
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static const int LF_NUM_PINS_IN_THIS_FILE= N
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#define _lf_pin(PINS, PIN, ADDR) \
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( \
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assert(PIN < LF_NUM_PINS_IN_THIS_FILE), \
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my_atomic_storeptr(&(PINS)->pin[PIN], (ADDR)) \
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)
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#else
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#define LF_REQUIRE_PINS(N)
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#define _lf_pin(PINS, PIN, ADDR) my_atomic_storeptr(&(PINS)->pin[PIN], (ADDR))
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#endif
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#define _lf_unpin(PINS, PIN) _lf_pin(PINS, PIN, NULL)
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#define lf_pin(PINS, PIN, ADDR) \
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do { \
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lf_rwlock_by_pins(PINS); \
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_lf_pin(PINS, PIN, ADDR); \
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lf_rwunlock_by_pins(PINS); \
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} while (0)
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#define lf_unpin(PINS, PIN) lf_pin(PINS, PIN, NULL)
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#define _lf_assert_pin(PINS, PIN) assert((PINS)->pin[PIN] != 0)
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#define _lf_assert_unpin(PINS, PIN) assert((PINS)->pin[PIN] == 0)
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void lf_pinbox_init(LF_PINBOX *pinbox, uint free_ptr_offset,
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lf_pinbox_free_func *free_func, void * free_func_arg);
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void lf_pinbox_destroy(LF_PINBOX *pinbox);
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lock_wrap(lf_pinbox_get_pins, LF_PINS *,
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(LF_PINBOX *pinbox),
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(pinbox),
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&pinbox->pinstack.lock)
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lock_wrap_void(lf_pinbox_put_pins,
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(LF_PINS *pins),
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(pins),
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&pins->pinbox->pinstack.lock)
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lock_wrap_void(lf_pinbox_free,
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(LF_PINS *pins, void *addr),
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(pins, addr),
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&pins->pinbox->pinstack.lock)
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/*
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memory allocator, lf_alloc-pin.c
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*/
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struct st_lf_alloc_node {
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struct st_lf_alloc_node *next;
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};
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typedef struct st_lf_allocator {
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LF_PINBOX pinbox;
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struct st_lf_alloc_node * volatile top;
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uint element_size;
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uint32 volatile mallocs;
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} LF_ALLOCATOR;
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void lf_alloc_init(LF_ALLOCATOR *allocator, uint size, uint free_ptr_offset);
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void lf_alloc_destroy(LF_ALLOCATOR *allocator);
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uint lf_alloc_in_pool(LF_ALLOCATOR *allocator);
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/*
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shortcut macros to access underlying pinbox functions from an LF_ALLOCATOR
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see _lf_pinbox_get_pins() and _lf_pinbox_put_pins()
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*/
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#define _lf_alloc_free(PINS, PTR) _lf_pinbox_free((PINS), (PTR))
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#define lf_alloc_free(PINS, PTR) lf_pinbox_free((PINS), (PTR))
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#define _lf_alloc_get_pins(ALLOC) _lf_pinbox_get_pins(&(ALLOC)->pinbox)
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#define lf_alloc_get_pins(ALLOC) lf_pinbox_get_pins(&(ALLOC)->pinbox)
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#define _lf_alloc_put_pins(PINS) _lf_pinbox_put_pins(PINS)
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#define lf_alloc_put_pins(PINS) lf_pinbox_put_pins(PINS)
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#define lf_alloc_real_free(ALLOC, ADDR) my_free((gptr)(ADDR), MYF(0))
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lock_wrap(lf_alloc_new, void *,
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(LF_PINS *pins),
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(pins),
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&pins->pinbox->pinstack.lock)
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/*
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extendible hash, lf_hash.c
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*/
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#include <hash.h>
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#define LF_HASH_UNIQUE 1
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typedef struct {
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LF_DYNARRAY array; /* hash itself */
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LF_ALLOCATOR alloc; /* allocator for elements */
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hash_get_key get_key; /* see HASH */
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CHARSET_INFO *charset; /* see HASH */
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uint key_offset, key_length; /* see HASH */
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uint element_size, flags; /* LF_HASH_UNIQUE, etc */
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int32 volatile size; /* size of array */
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int32 volatile count; /* number of elements in the hash */
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} LF_HASH;
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void lf_hash_init(LF_HASH *hash, uint element_size, uint flags,
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uint key_offset, uint key_length, hash_get_key get_key,
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CHARSET_INFO *charset);
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void lf_hash_destroy(LF_HASH *hash);
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int lf_hash_insert(LF_HASH *hash, LF_PINS *pins, const void *data);
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void *lf_hash_search(LF_HASH *hash, LF_PINS *pins, const void *key, uint keylen);
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int lf_hash_delete(LF_HASH *hash, LF_PINS *pins, const void *key, uint keylen);
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/*
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shortcut macros to access underlying pinbox functions from an LF_HASH
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see _lf_pinbox_get_pins() and _lf_pinbox_put_pins()
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*/
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#define _lf_hash_get_pins(HASH) _lf_alloc_get_pins(&(HASH)->alloc)
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#define lf_hash_get_pins(HASH) lf_alloc_get_pins(&(HASH)->alloc)
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#define _lf_hash_put_pins(PINS) _lf_pinbox_put_pins(PINS)
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#define lf_hash_put_pins(PINS) lf_pinbox_put_pins(PINS)
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/*
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cleanup
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*/
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#undef lock_wrap_void
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#undef lock_wrap
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#undef nolock_wrap_void
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#undef nolock_wrap
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#endif
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