path: root/storage/innobase/include/univ.i

/*****************************************************************************

Copyright (c) 1994, 2013, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2008, Google Inc.
Copyright (c) 2013, 2014 SkySQL Ab.

Portions of this file contain modifications contributed and copyrighted by
Google, Inc. Those modifications are gratefully acknowledged and are described
briefly in the InnoDB documentation. The contributions by Google are
incorporated with their permission, and subject to the conditions contained in
the file COPYING.Google.

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.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/***********************************************************************//**
@file include/univ.i
Version control for database, common definitions, and include files

Created 1/20/1994 Heikki Tuuri
****************************************************************************/

#ifndef univ_i
#define univ_i

#ifdef UNIV_HOTBACKUP
#include "hb_univ.i"
#endif /* UNIV_HOTBACKUP */

/* aux macros to convert M into "123" (string) if M is defined like
#define M 123 */
#define _IB_TO_STR(s)	#s
#define IB_TO_STR(s)	_IB_TO_STR(s)

#define INNODB_VERSION_MAJOR	5
#define INNODB_VERSION_MINOR	6
#define INNODB_VERSION_BUGFIX	17

/* The following is the InnoDB version as shown in
SELECT plugin_version FROM information_schema.plugins;
calculated in make_version_string() in sql/sql_show.cc like this:
"version >> 8" . "version & 0xff"
because the version is shown with only one dot, we skip the last
component, i.e. we show M.N.P as M.N */
#define INNODB_VERSION_SHORT	\
	(INNODB_VERSION_MAJOR << 8 | INNODB_VERSION_MINOR)

#define INNODB_VERSION_STR			\
	IB_TO_STR(INNODB_VERSION_MAJOR) "."	\
	IB_TO_STR(INNODB_VERSION_MINOR) "."	\
	IB_TO_STR(INNODB_VERSION_BUGFIX)

#define REFMAN "http://dev.mysql.com/doc/refman/"	\
	IB_TO_STR(INNODB_VERSION_MAJOR) "."		\
	IB_TO_STR(INNODB_VERSION_MINOR) "/en/"

#ifdef MYSQL_DYNAMIC_PLUGIN
/* In the dynamic plugin, redefine some externally visible symbols
in order not to conflict with the symbols of a builtin InnoDB. */

/* Rename all C++ classes that contain virtual functions, because we
have not figured out how to apply the visibility=hidden attribute to
the virtual method table (vtable) in GCC 3. */
# define ha_innobase ha_innodb
#endif /* MYSQL_DYNAMIC_PLUGIN */

#if (defined(WIN32) || defined(_WIN32) || defined(WIN64) || defined(_WIN64)) && !defined(MYSQL_SERVER) && !defined(__WIN__)
# undef __WIN__
# define __WIN__

# include <windows.h>

# ifdef _NT_
#  define __NT__
# endif

#else
/* The defines used with MySQL */

/* Include two header files from MySQL to make the Unix flavor used
in compiling more Posix-compatible. These headers also define __WIN__
if we are compiling on Windows. */

#ifndef UNIV_HOTBACKUP
# include <my_global.h>
# include <my_pthread.h>
#endif /* UNIV_HOTBACKUP */

/* Include <sys/stat.h> to get S_I... macros defined for os0file.cc */
# include <sys/stat.h>
# if !defined(__WIN__)
#  include <sys/mman.h> /* mmap() for os0proc.cc */
# endif

/* Include the header file generated by GNU autoconf */
# ifndef __WIN__
#  ifndef UNIV_HOTBACKUP
#   include "config.h"
#  endif /* UNIV_HOTBACKUP */
# endif

# ifdef HAVE_SCHED_H
#  include <sched.h>
# endif

/* We only try to do explicit inlining of functions with gcc and
Sun Studio */

# ifdef HAVE_PREAD
#  define HAVE_PWRITE
# endif

#endif /* #if (defined(WIN32) || ... */

#ifndef __WIN__
#define __STDC_FORMAT_MACROS    /* Enable C99 printf format macros */
#include <inttypes.h>
#endif /* !__WIN__ */

/* Following defines are to enable performance schema
instrumentation in each of four InnoDB modules if
HAVE_PSI_INTERFACE is defined. */
#if defined HAVE_PSI_INTERFACE && !defined UNIV_HOTBACKUP
# define UNIV_PFS_MUTEX
# define UNIV_PFS_RWLOCK
/* For I/O instrumentation, performance schema rely
on a native descriptor to identify the file, this
descriptor could conflict with our OS level descriptor.
Disable IO instrumentation on Windows until this is
resolved */
# ifndef __WIN__
#  define UNIV_PFS_IO
# endif
# define UNIV_PFS_THREAD

/* There are mutexes/rwlocks that we want to exclude from
instrumentation even if their corresponding performance schema
define is set. And this PFS_NOT_INSTRUMENTED is used
as the key value to identify those objects that would
be excluded from instrumentation. */
# define PFS_NOT_INSTRUMENTED		ULINT32_UNDEFINED

# define PFS_IS_INSTRUMENTED(key)	((key) != PFS_NOT_INSTRUMENTED)

#endif /* HAVE_PSI_INTERFACE */

#ifdef __WIN__
# define YY_NO_UNISTD_H 1
#endif /* __WIN__ */

/*			DEBUG VERSION CONTROL
			===================== */

/* When this macro is defined then additional test functions will be
compiled. These functions live at the end of each relevant source file
and have "test_" prefix. These functions are not called from anywhere in
the code, they can be called from gdb after
innobase_start_or_create_for_mysql() has executed using the call
command. Not tested on Windows. */
/*
#define UNIV_COMPILE_TEST_FUNCS
*/

#if defined(HAVE_valgrind)&& defined(HAVE_VALGRIND_MEMCHECK_H)
# define UNIV_DEBUG_VALGRIND
#endif /* HAVE_VALGRIND */
#if 0
#define UNIV_DEBUG_VALGRIND			/* Enable extra
						Valgrind instrumentation */
#define UNIV_DEBUG_PRINT			/* Enable the compilation of
						some debug print functions */
#define UNIV_AHI_DEBUG				/* Enable adaptive hash index
						debugging without UNIV_DEBUG */
#define UNIV_BUF_DEBUG				/* Enable buffer pool
						debugging without UNIV_DEBUG */
#define UNIV_BLOB_LIGHT_DEBUG			/* Enable off-page column
						debugging without UNIV_DEBUG */
#define UNIV_DEBUG				/* Enable ut_ad() assertions
						and disable UNIV_INLINE */
#define UNIV_DEBUG_LOCK_VALIDATE		/* Enable
						ut_ad(lock_rec_validate_page())
						assertions. */
#define UNIV_DEBUG_FILE_ACCESSES		/* Enable freed block access
						debugging without UNIV_DEBUG */
#define UNIV_LRU_DEBUG				/* debug the buffer pool LRU */
#define UNIV_HASH_DEBUG				/* debug HASH_ macros */
#define UNIV_LIST_DEBUG				/* debug UT_LIST_ macros */
#define UNIV_LOG_LSN_DEBUG			/* write LSN to the redo log;
this will break redo log file compatibility, but it may be useful when
debugging redo log application problems. */
#define UNIV_MEM_DEBUG				/* detect memory leaks etc */
#define UNIV_IBUF_DEBUG				/* debug the insert buffer */
#define UNIV_BLOB_DEBUG				/* track BLOB ownership;
assumes that no BLOBs survive server restart */
#define UNIV_IBUF_COUNT_DEBUG			/* debug the insert buffer;
this limits the database to IBUF_COUNT_N_SPACES and IBUF_COUNT_N_PAGES,
and the insert buffer must be empty when the database is started */
#define UNIV_PERF_DEBUG                         /* debug flag that enables
                                                light weight performance
                                                related stuff. */
#define UNIV_SYNC_DEBUG				/* debug mutex and latch
operations (very slow); also UNIV_DEBUG must be defined */
#define UNIV_SEARCH_DEBUG			/* debug B-tree comparisons */
#define UNIV_SYNC_PERF_STAT			/* operation counts for
						rw-locks and mutexes */
#define UNIV_SEARCH_PERF_STAT			/* statistics for the
						adaptive hash index */
#define UNIV_SRV_PRINT_LATCH_WAITS		/* enable diagnostic output
						in sync0sync.cc */
#define UNIV_BTR_PRINT				/* enable functions for
						printing B-trees */
#define UNIV_ZIP_DEBUG				/* extensive consistency checks
						for compressed pages */
#define UNIV_ZIP_COPY				/* call page_zip_copy_recs()
						more often */
#define UNIV_AIO_DEBUG				/* prints info about
						submitted and reaped AIO
						requests to the log. */
#define UNIV_STATS_DEBUG			/* prints various stats
						related debug info from
						dict0stats.c */
#define FTS_INTERNAL_DIAG_PRINT                 /* FTS internal debugging
                                                info output */
#endif

#define UNIV_BTR_DEBUG				/* check B-tree links */
#define UNIV_LIGHT_MEM_DEBUG			/* light memory debugging */

/*
#define UNIV_SQL_DEBUG
#define UNIV_LOG_DEBUG
*/
			/* the above option prevents forcing of log to disk
			at a buffer page write: it should be tested with this
			option off; also some ibuf tests are suppressed */

/* Linkage specifier for non-static InnoDB symbols (variables and functions)
that are only referenced from within InnoDB, not from MySQL. We disable the
GCC visibility directive on all Sun operating systems because there is no
easy way to get it to work. See http://bugs.mysql.com/bug.php?id=52263. */
#if defined(__GNUC__) && (__GNUC__ >= 4) && !defined(sun) || defined(__INTEL_COMPILER)
# define UNIV_INTERN __attribute__((visibility ("hidden")))
#else
# define UNIV_INTERN
#endif
#if defined(INNODB_COMPILER_HINTS)      \
    && defined __GNUC__                 \
    && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 3)
/** Starting with GCC 4.3, the "cold" attribute is used to inform the
compiler that a function is unlikely executed.  The function is
optimized for size rather than speed and on many targets it is placed
into special subsection of the text section so all cold functions
appears close together improving code locality of non-cold parts of
program.  The paths leading to call of cold functions within code are
marked as unlikely by the branch prediction mechanism.  optimize a
rarely invoked function for size instead for speed. */
# define UNIV_COLD __attribute__((cold))
#else
# define UNIV_COLD /* empty */
#endif

#ifndef UNIV_MUST_NOT_INLINE
/* Definition for inline version */

#define UNIV_INLINE static inline

#else /* !UNIV_MUST_NOT_INLINE */
/* If we want to compile a noninlined version we use the following macro
definitions: */

#define UNIV_NONINL
#define UNIV_INLINE	UNIV_INTERN

#endif /* !UNIV_MUST_NOT_INLINE */

#ifdef _WIN32
#define UNIV_WORD_SIZE		4
#elif defined(_WIN64)
#define UNIV_WORD_SIZE		8
#else
/** MySQL config.h generated by GNU autoconf will define SIZEOF_LONG in Posix */
#define UNIV_WORD_SIZE		SIZEOF_LONG
#endif

/** The following alignment is used in memory allocations in memory heap
management to ensure correct alignment for doubles etc. */
#define UNIV_MEM_ALIGNMENT	8

/** The following alignment is used in aligning lints etc. */
#define UNIV_WORD_ALIGNMENT	UNIV_WORD_SIZE

/*
			DATABASE VERSION CONTROL
			========================
*/

/** There are currently two InnoDB file formats which are used to group
features with similar restrictions and dependencies. Using an enum allows
switch statements to give a compiler warning when a new one is introduced. */
enum innodb_file_formats_enum {
	/** Antelope File Format: InnoDB/MySQL up to 5.1.
	This format includes REDUNDANT and COMPACT row formats */
	UNIV_FORMAT_A		= 0,

	/** Barracuda File Format: Introduced in InnoDB plugin for 5.1:
	This format includes COMPRESSED and DYNAMIC row formats.  It
	includes the ability to create secondary indexes from data that
	is not on the clustered index page and the ability to store more
	data off the clustered index page. */
	UNIV_FORMAT_B		= 1
};

typedef enum innodb_file_formats_enum innodb_file_formats_t;

/** Minimum supported file format */
#define UNIV_FORMAT_MIN		UNIV_FORMAT_A

/** Maximum supported file format */
#define UNIV_FORMAT_MAX		UNIV_FORMAT_B

/** The 2-logarithm of UNIV_PAGE_SIZE: */
#define UNIV_PAGE_SIZE_SHIFT	srv_page_size_shift

#ifdef HAVE_LZO
#define IF_LZO(A,B) A
#else
#define IF_LZO(A,B) B
#endif

#ifdef HAVE_LZ4
#define IF_LZ4(A,B) A
#else
#define IF_LZ4(A,B) B
#endif

#ifdef HAVE_LZMA
#define IF_LZMA(A,B) A
#else
#define IF_LZMA(A,B) B
#endif

#ifdef HAVE_BZIP2
#define IF_BZIP2(A,B) A
#else
#define IF_BZIP2(A,B) B
#endif

/** The universal page size of the database */
#define UNIV_PAGE_SIZE		((ulint) srv_page_size)

/** log2 of smallest compressed page size (1<<10 == 1024 bytes)
Note: This must never change! */
#define UNIV_ZIP_SIZE_SHIFT_MIN		10

/** log2 of largest compressed page size (1<<14 == 16384 bytes).
A compressed page directory entry reserves 14 bits for the start offset
and 2 bits for flags. This limits the uncompressed page size to 16k.
Even though a 16k uncompressed page can theoretically be compressed
into a larger compressed page, it is not a useful feature so we will
limit both with this same constant. */
#define UNIV_ZIP_SIZE_SHIFT_MAX		15

/* Define the Min, Max, Default page sizes. */
/** Minimum Page Size Shift (power of 2) */
#define UNIV_PAGE_SIZE_SHIFT_MIN	12
/** log2 of largest page size (1<<16 == 64436 bytes). */
/** Maximum Page Size Shift (power of 2) */
#define UNIV_PAGE_SIZE_SHIFT_MAX	16
/** log2 of default page size (1<<14 == 16384 bytes). */
/** Default Page Size Shift (power of 2) */
#define UNIV_PAGE_SIZE_SHIFT_DEF	14
/** Original 16k InnoDB Page Size Shift, in case the default changes */
#define UNIV_PAGE_SIZE_SHIFT_ORIG	14

/** Minimum page size InnoDB currently supports. */
#define UNIV_PAGE_SIZE_MIN	(1 << UNIV_PAGE_SIZE_SHIFT_MIN)
/** Maximum page size InnoDB currently supports. */
#define UNIV_PAGE_SIZE_MAX	(1 << UNIV_PAGE_SIZE_SHIFT_MAX)
/** Default page size for InnoDB tablespaces. */
#define UNIV_PAGE_SIZE_DEF	(1 << UNIV_PAGE_SIZE_SHIFT_DEF)
/** Original 16k page size for InnoDB tablespaces. */
#define UNIV_PAGE_SIZE_ORIG	(1 << UNIV_PAGE_SIZE_SHIFT_ORIG)

/** Smallest compressed page size */
#define UNIV_ZIP_SIZE_MIN	(1 << UNIV_ZIP_SIZE_SHIFT_MIN)

/** Largest compressed page size */
#define UNIV_ZIP_SIZE_MAX	(1 << UNIV_ZIP_SIZE_SHIFT_MAX)

/** Number of supported page sizes (The convention 'ssize' is used
for 'log2 minus 9' or the number of shifts starting with 512.)
This number varies depending on UNIV_PAGE_SIZE. */
#define UNIV_PAGE_SSIZE_MAX					\
	(UNIV_PAGE_SIZE_SHIFT - UNIV_ZIP_SIZE_SHIFT_MIN + 1)

/** Maximum number of parallel threads in a parallelized operation */
#define UNIV_MAX_PARALLELISM	32

/** This is the "mbmaxlen" for my_charset_filename (defined in
strings/ctype-utf8.c), which is used to encode File and Database names. */
#define FILENAME_CHARSET_MAXNAMLEN	5

/** The maximum length of an encode table name in bytes.  The max
table and database names are NAME_CHAR_LEN (64) characters. After the
encoding, the max length would be NAME_CHAR_LEN (64) *
FILENAME_CHARSET_MAXNAMLEN (5) = 320 bytes. The number does not include a
terminating '\0'. InnoDB can handle longer names internally */
#define MAX_TABLE_NAME_LEN	320

/** The maximum length of a database name. Like MAX_TABLE_NAME_LEN this is
the MySQL's NAME_LEN, see check_and_convert_db_name(). */
#define MAX_DATABASE_NAME_LEN	MAX_TABLE_NAME_LEN

/** MAX_FULL_NAME_LEN defines the full name path including the
database name and table name. In addition, 14 bytes is added for:
	2 for surrounding quotes around table name
	1 for the separating dot (.)
	9 for the #mysql50# prefix */
#define MAX_FULL_NAME_LEN				\
	(MAX_TABLE_NAME_LEN + MAX_DATABASE_NAME_LEN + 14)

/** The maximum length in bytes that a database name can occupy when stored in
UTF8, including the terminating '\0', see dict_fs2utf8(). You must include
mysql_com.h if you are to use this macro. */
#define MAX_DB_UTF8_LEN		(NAME_LEN + 1)

/** The maximum length in bytes that a table name can occupy when stored in
UTF8, including the terminating '\0', see dict_fs2utf8(). You must include
mysql_com.h if you are to use this macro. */
#define MAX_TABLE_UTF8_LEN	(NAME_LEN + sizeof(srv_mysql50_table_name_prefix))

/*
			UNIVERSAL TYPE DEFINITIONS
			==========================
*/

/* Note that inside MySQL 'byte' is defined as char on Linux! */
#define byte			unsigned char

/* Another basic type we use is unsigned long integer which should be equal to
the word size of the machine, that is on a 32-bit platform 32 bits, and on a
64-bit platform 64 bits. We also give the printf format for the type as a
macro ULINTPF. */


#ifdef __WIN__
/* Use the integer types and formatting strings defined in Visual Studio. */
# define UINT32PF	"%I32u"
# define INT64PF	"%I64d"
# define UINT64PF	"%I64u"
# define UINT64PFx	"%016I64x"
# define DBUG_LSN_PF    "%llu"
typedef __int64 ib_int64_t;
typedef unsigned __int64 ib_uint64_t;
typedef unsigned __int32 ib_uint32_t;
#else
/* Use the integer types and formatting strings defined in the C99 standard. */
# define UINT32PF	"%"PRIu32
# define INT64PF	"%"PRId64
# define UINT64PF	"%"PRIu64
# define UINT64PFx	"%016"PRIx64
# define DBUG_LSN_PF    UINT64PF
typedef int64_t ib_int64_t;
typedef uint64_t ib_uint64_t;
typedef uint32_t ib_uint32_t;
# endif /* __WIN__ */

# define IB_ID_FMT	UINT64PF

#ifdef _WIN64
typedef unsigned __int64	ulint;
typedef __int64			lint;
# define ULINTPF		UINT64PF
#else
typedef unsigned long int	ulint;
typedef long int		lint;
# define ULINTPF		"%lu"
#endif /* _WIN64 */

#ifndef UNIV_HOTBACKUP
typedef unsigned long long int	ullint;
#endif /* UNIV_HOTBACKUP */

#ifndef __WIN__
#if SIZEOF_LONG != SIZEOF_VOIDP
#error "Error: InnoDB's ulint must be of the same size as void*"
#endif
#endif

/** The 'undefined' value for a ulint */
#define ULINT_UNDEFINED		((ulint)(-1))

#define ULONG_UNDEFINED		((ulong)(-1))

/** The 'undefined' value for a ib_uint64_t */
#define UINT64_UNDEFINED	((ib_uint64_t)(-1))

/** The bitmask of 32-bit unsigned integer */
#define ULINT32_MASK		0xFFFFFFFF
/** The undefined 32-bit unsigned integer */
#define	ULINT32_UNDEFINED	ULINT32_MASK

/** Maximum value for a ulint */
#define ULINT_MAX		((ulint)(-2))

/** Maximum value for ib_uint64_t */
#define IB_UINT64_MAX		((ib_uint64_t) (~0ULL))

/** The generic InnoDB system object identifier data type */
typedef ib_uint64_t		ib_id_t;
#define IB_ID_MAX		IB_UINT64_MAX

/** The 'undefined' value for a ullint */
#define ULLINT_UNDEFINED        ((ullint)(-1))

/** This 'ibool' type is used within Innobase. Remember that different included
headers may define 'bool' differently. Do not assume that 'bool' is a ulint! */
#define ibool			ulint

#ifndef TRUE

#define TRUE    1
#define FALSE   0

#endif

#define UNIV_NOTHROW

/** The following number as the length of a logical field means that the field
has the SQL NULL as its value. NOTE that because we assume that the length
of a field is a 32-bit integer when we store it, for example, to an undo log
on disk, we must have also this number fit in 32 bits, also in 64-bit
computers! */

#define UNIV_SQL_NULL ULINT32_UNDEFINED

/** Lengths which are not UNIV_SQL_NULL, but bigger than the following
number indicate that a field contains a reference to an externally
stored part of the field in the tablespace. The length field then
contains the sum of the following flag and the locally stored len. */

#define UNIV_EXTERN_STORAGE_FIELD (UNIV_SQL_NULL - UNIV_PAGE_SIZE_MAX)

#if defined(__GNUC__) && (__GNUC__ > 2) && ! defined(__INTEL_COMPILER)
#define HAVE_GCC_GT_2
/* Tell the compiler that variable/function is unused. */
# define UNIV_UNUSED    __attribute__ ((unused))
#else
# define UNIV_UNUSED
#endif /* CHECK FOR GCC VER_GT_2 */

/* Some macros to improve branch prediction and reduce cache misses */
#if defined(INNODB_COMPILER_HINTS) && defined(HAVE_GCC_GT_2)
/* Tell the compiler that 'expr' probably evaluates to 'constant'. */
# define UNIV_EXPECT(expr,constant) __builtin_expect(expr, constant)
/* Tell the compiler that a pointer is likely to be NULL */
# define UNIV_LIKELY_NULL(ptr) __builtin_expect((ulint) ptr, 0)
/* Minimize cache-miss latency by moving data at addr into a cache before
it is read. */
# define UNIV_PREFETCH_R(addr) __builtin_prefetch(addr, 0, 3)
/* Minimize cache-miss latency by moving data at addr into a cache before
it is read or written. */
# define UNIV_PREFETCH_RW(addr) __builtin_prefetch(addr, 1, 3)

/* Sun Studio includes sun_prefetch.h as of version 5.9 */
#elif (defined(__SUNPRO_C) && __SUNPRO_C >= 0x590) \
       || (defined(__SUNPRO_CC) && __SUNPRO_CC >= 0x590)

# include <sun_prefetch.h>

#if __SUNPRO_C >= 0x550
# undef UNIV_INTERN
# define UNIV_INTERN __hidden
#endif /* __SUNPRO_C >= 0x550 */

# define UNIV_EXPECT(expr,value) (expr)
# define UNIV_LIKELY_NULL(expr) (expr)

# if defined(INNODB_COMPILER_HINTS)
//# define UNIV_PREFETCH_R(addr) sun_prefetch_read_many((void*) addr)
#  define UNIV_PREFETCH_R(addr) ((void) 0)
#  define UNIV_PREFETCH_RW(addr) sun_prefetch_write_many(addr)
# else
#  define UNIV_PREFETCH_R(addr) ((void) 0)
#  define UNIV_PREFETCH_RW(addr) ((void) 0)
# endif /* INNODB_COMPILER_HINTS */

#else
/* Dummy versions of the macros */
# define UNIV_EXPECT(expr,value) (expr)
# define UNIV_LIKELY_NULL(expr) (expr)
# define UNIV_PREFETCH_R(addr) ((void) 0)
# define UNIV_PREFETCH_RW(addr) ((void) 0)
#endif

/* Tell the compiler that cond is likely to hold */
#define UNIV_LIKELY(cond) UNIV_EXPECT(cond, TRUE)
/* Tell the compiler that cond is unlikely to hold */
#define UNIV_UNLIKELY(cond) UNIV_EXPECT(cond, FALSE)

/* Compile-time constant of the given array's size. */
#define UT_ARR_SIZE(a) (sizeof(a) / sizeof((a)[0]))

/* The return type from a thread's start function differs between Unix and
Windows, so define a typedef for it and a macro to use at the end of such
functions. */

#ifdef __WIN__
typedef ulint os_thread_ret_t;
#define OS_THREAD_DUMMY_RETURN return(0)
#else
typedef void* os_thread_ret_t;
#define OS_THREAD_DUMMY_RETURN return(NULL)
#endif

#include <stdio.h>
#include "ut0dbg.h"
#include "ut0ut.h"
#include "db0err.h"
#ifdef UNIV_DEBUG_VALGRIND
# include <valgrind/memcheck.h>
# define UNIV_MEM_VALID(addr, size) VALGRIND_MAKE_MEM_DEFINED(addr, size)
# define UNIV_MEM_INVALID(addr, size) VALGRIND_MAKE_MEM_UNDEFINED(addr, size)
# define UNIV_MEM_FREE(addr, size) VALGRIND_MAKE_MEM_NOACCESS(addr, size)
# define UNIV_MEM_ALLOC(addr, size) VALGRIND_MAKE_MEM_UNDEFINED(addr, size)
# define UNIV_MEM_DESC(addr, size) VALGRIND_CREATE_BLOCK(addr, size, #addr)
# define UNIV_MEM_UNDESC(b) VALGRIND_DISCARD(b)
# define UNIV_MEM_ASSERT_RW_LOW(addr, size, should_abort) do {		\
	const void* _p = (const void*) (ulint)				\
		VALGRIND_CHECK_MEM_IS_DEFINED(addr, size);		\
	if (UNIV_LIKELY_NULL(_p)) {					\
		fprintf(stderr, "%s:%d: %p[%u] undefined at %ld\n",	\
			__FILE__, __LINE__,				\
			(const void*) (addr), (unsigned) (size), (long)	\
			(((const char*) _p) - ((const char*) (addr))));	\
		if (should_abort) {					\
			ut_error;					\
		}							\
	}								\
} while (0)
# define UNIV_MEM_ASSERT_RW(addr, size)					\
	UNIV_MEM_ASSERT_RW_LOW(addr, size, false)
# define UNIV_MEM_ASSERT_RW_ABORT(addr, size)				\
	UNIV_MEM_ASSERT_RW_LOW(addr, size, true)
# define UNIV_MEM_ASSERT_W(addr, size) do {				\
	const void* _p = (const void*) (ulint)				\
		VALGRIND_CHECK_MEM_IS_ADDRESSABLE(addr, size);		\
	if (UNIV_LIKELY_NULL(_p))					\
		fprintf(stderr, "%s:%d: %p[%u] unwritable at %ld\n",	\
			__FILE__, __LINE__,				\
			(const void*) (addr), (unsigned) (size), (long)	\
			(((const char*) _p) - ((const char*) (addr))));	\
	} while (0)
# define UNIV_MEM_TRASH(addr, c, size) do {				\
	ut_d(memset(addr, c, size));					\
	UNIV_MEM_INVALID(addr, size);					\
	} while (0)
#else
# define UNIV_MEM_VALID(addr, size) do {} while(0)
# define UNIV_MEM_INVALID(addr, size) do {} while(0)
# define UNIV_MEM_FREE(addr, size) do {} while(0)
# define UNIV_MEM_ALLOC(addr, size) do {} while(0)
# define UNIV_MEM_DESC(addr, size) do {} while(0)
# define UNIV_MEM_UNDESC(b) do {} while(0)
# define UNIV_MEM_ASSERT_RW_LOW(addr, size, should_abort) do {} while(0)
# define UNIV_MEM_ASSERT_RW(addr, size) do {} while(0)
# define UNIV_MEM_ASSERT_RW_ABORT(addr, size) do {} while(0)
# define UNIV_MEM_ASSERT_W(addr, size) do {} while(0)
# define UNIV_MEM_TRASH(addr, c, size) do {} while(0)
#endif
#define UNIV_MEM_ASSERT_AND_FREE(addr, size) do {	\
	UNIV_MEM_ASSERT_W(addr, size);			\
	UNIV_MEM_FREE(addr, size);			\
} while (0)
#define UNIV_MEM_ASSERT_AND_ALLOC(addr, size) do {	\
	UNIV_MEM_ASSERT_W(addr, size);			\
	UNIV_MEM_ALLOC(addr, size);			\
} while (0)

extern ulong	srv_page_size_shift;
extern ulong	srv_page_size;

#endif