http://blog.csdn.net/yangzhongxuan/article/details/7397139

/* Copyright (C) 2002,2003,2004,2005,2006,2007 Free Software Foundation, Inc.

This file is part of the GNU C Library.

Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

The GNU C Library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

The GNU C Library 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

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with the GNU C Library; if not, write to the Free

Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

02111-1307 USA. */

#ifndef _BITS_PTHREADTYPES_H

#define _BITS_PTHREADTYPES_H 1

#include <bits/wordsize.h>

#if __WORDSIZE == 64

# define __SIZEOF_PTHREAD_ATTR_T 56

# define __SIZEOF_PTHREAD_MUTEX_T 40

# define __SIZEOF_PTHREAD_MUTEXATTR_T 4

# define __SIZEOF_PTHREAD_COND_T 48

# define __SIZEOF_PTHREAD_CONDATTR_T 4

# define __SIZEOF_PTHREAD_RWLOCK_T 56

# define __SIZEOF_PTHREAD_RWLOCKATTR_T 8

# define __SIZEOF_PTHREAD_BARRIER_T 32

# define __SIZEOF_PTHREAD_BARRIERATTR_T 4

#else

# define __SIZEOF_PTHREAD_ATTR_T 36

# define __SIZEOF_PTHREAD_MUTEX_T 24

# define __SIZEOF_PTHREAD_MUTEXATTR_T 4

# define __SIZEOF_PTHREAD_COND_T 48

# define __SIZEOF_PTHREAD_CONDATTR_T 4

# define __SIZEOF_PTHREAD_RWLOCK_T 32

# define __SIZEOF_PTHREAD_RWLOCKATTR_T 8

# define __SIZEOF_PTHREAD_BARRIER_T 20

# define __SIZEOF_PTHREAD_BARRIERATTR_T 4

#endif

/* Thread identifiers. The structure of the attribute type is not

exposed on purpose. */

typedef unsigned long int pthread_t;

typedef union

{

char __size[__SIZEOF_PTHREAD_ATTR_T];

long int __align;

} pthread_attr_t;

#if __WORDSIZE == 64

typedef struct __pthread_internal_list

{

struct __pthread_internal_list *__prev;

struct __pthread_internal_list *__next;

} __pthread_list_t;

#else

typedef struct __pthread_internal_slist

{

struct __pthread_internal_slist *__next;

} __pthread_slist_t;

#endif

/* Data structures for mutex handling. The structure of the attribute

type is not exposed on purpose. */

typedef union

{

struct __pthread_mutex_s

{

int __lock;

unsigned int __count;

int __owner;

#if __WORDSIZE == 64

unsigned int __nusers;

#endif

/* KIND must stay at this position in the structure to maintain

binary compatibility. */

int __kind;

#if __WORDSIZE == 64

int __spins;

__pthread_list_t __list;

# define __PTHREAD_MUTEX_HAVE_PREV 1

#else

unsigned int __nusers;

__extension__ union

{

int __spins;

__pthread_slist_t __list;

};

#endif

} __data;

char __size[__SIZEOF_PTHREAD_MUTEX_T];

long int __align;

} pthread_mutex_t;

typedef union

{

char __size[__SIZEOF_PTHREAD_MUTEXATTR_T];

int __align;

} pthread_mutexattr_t;

/* Data structure for conditional variable handling. The structure of

the attribute type is not exposed on purpose. */

typedef union

{

struct

{

int __lock;

unsigned int __futex;

__extension__ unsigned long long int __total_seq;

__extension__ unsigned long long int __wakeup_seq;

__extension__ unsigned long long int __woken_seq;

void *__mutex;

unsigned int __nwaiters;

unsigned int __broadcast_seq;

} __data;

char __size[__SIZEOF_PTHREAD_COND_T];

__extension__ long long int __align;

} pthread_cond_t;

typedef union

{

char __size[__SIZEOF_PTHREAD_CONDATTR_T];

int __align;

} pthread_condattr_t;

/* Keys for thread-specific data */

typedef unsigned int pthread_key_t;

/* Once-only execution */

typedef int pthread_once_t;

#if defined __USE_UNIX98 || defined __USE_XOPEN2K

/* Data structure for read-write lock variable handling. The

structure of the attribute type is not exposed on purpose. */

typedef union

{

# if __WORDSIZE == 64

struct

{

int __lock;

unsigned int __nr_readers;

unsigned int __readers_wakeup;

unsigned int __writer_wakeup;

unsigned int __nr_readers_queued;

unsigned int __nr_writers_queued;

int __writer;

int __shared;

unsigned long int __pad1;

unsigned long int __pad2;

/* FLAGS must stay at this position in the structure to maintain

binary compatibility. */

unsigned int __flags;

} __data;

# else

struct

{

int __lock;

unsigned int __nr_readers;

unsigned int __readers_wakeup;

unsigned int __writer_wakeup;

unsigned int __nr_readers_queued;

unsigned int __nr_writers_queued;

/* FLAGS must stay at this position in the structure to maintain

binary compatibility. */

unsigned char __flags;

unsigned char __shared;

unsigned char __pad1;

unsigned char __pad2;

int __writer;

} __data;

# endif

char __size[__SIZEOF_PTHREAD_RWLOCK_T];

long int __align;

} pthread_rwlock_t;

typedef union

{

char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];

long int __align;

} pthread_rwlockattr_t;

#endif

#ifdef __USE_XOPEN2K

/* POSIX spinlock data type. */

typedef volatile int pthread_spinlock_t;

/* POSIX barriers data type. The structure of the type is

deliberately not exposed. */

typedef union

{

char __size[__SIZEOF_PTHREAD_BARRIER_T];

long int __align;

} pthread_barrier_t;

typedef union

{

char __size[__SIZEOF_PTHREAD_BARRIERATTR_T];

int __align;

} pthread_barrierattr_t;

#endif

#if __WORDSIZE == 32

/* Extra attributes for the cleanup functions. */

# define __cleanup_fct_attribute __attribute__ ((__regparm__ (1)))

#endif

#endif /* bits/pthreadtypes.h */