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[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / hppa / nptl / bits / pthreadtypes.h

/* Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _BITS_PTHREADTYPES_H
#define _BITS_PTHREADTYPES_H	1

/* Linuxthread type sizes (bytes):
   sizeof(pthread_attr_t) = 0x24 (36)
   sizeof(pthread_barrier_t) = 0x30 (48)
   sizeof(pthread_barrierattr_t) = 0x4 (4) 
   sizeof(pthread_cond_t) = 0x30 (48)
   sizeof(pthread_condattr_t) = 0x4 (4)
   sizeof(pthread_mutex_t) = 0x30 (48)
   sizeof(pthread_mutexattr_t) = 0x4 (4)
   sizeof(pthread_rwlock_t) = 0x40 (64)
   sizeof(pthread_rwlockattr_t) = 0x8 (8)
   sizeof(pthread_spinlock_t) = 0x10 (16) */

#define __SIZEOF_PTHREAD_ATTR_T 36
#define __SIZEOF_PTHREAD_BARRIER_T 48
#define __SIZEOF_PTHREAD_BARRIERATTR_T 4
#define __SIZEOF_PTHREAD_COND_T 48 
#define __SIZEOF_PTHREAD_CONDATTR_T 4
#define __SIZEOF_PTHREAD_MUTEX_T 48 
#define __SIZEOF_PTHREAD_MUTEXATTR_T 4
#define __SIZEOF_PTHREAD_RWLOCK_T 64
#define __SIZEOF_PTHREAD_RWLOCKATTR_T 8

/* Thread identifiers.  The structure of the attribute type is not
   exposed on purpose.  */
typedef unsigned long int pthread_t;

union pthread_attr_t
{
  char __size[__SIZEOF_PTHREAD_ATTR_T];
  long int __align;
};
#ifndef __have_pthread_attr_t
typedef union pthread_attr_t pthread_attr_t;
# define __have_pthread_attr_t	1
#endif


typedef struct __pthread_internal_slist
{
  struct __pthread_internal_slist *__next;
} __pthread_slist_t;


/* Data structures for mutex handling.  The structure of the attribute
   type is not exposed on purpose.  */
typedef union
{
  struct __pthread_mutex_s
  {
    int __lock __attribute__ ((aligned(16)));
    unsigned int __count;
    int __owner;
    /* KIND must stay at this position in the structure to maintain
       binary compatibility.  */
    int __kind;
    /* The old 4-word 16-byte aligned lock. This is initalized
       to all ones by the Linuxthreads PTHREAD_MUTEX_INITIALIZER. 
       Unused in NPTL.  */
    int __compat_padding[4];
    /* In the old structure there are 4 words left due to alignment.
       In NPTL two words are used.  */
    unsigned int __nusers;
    __extension__ union
    {
      int __spins;
      __pthread_slist_t __list;
    };
    /* Two more words are left before the NPTL
       pthread_mutex_t is larger than Linuxthreads.  */
    int __reserved1;
    int __reserved2;
  } __data;
  char __size[__SIZEOF_PTHREAD_MUTEX_T];
  long int __align;
} pthread_mutex_t;

typedef union
{
  char __size[__SIZEOF_PTHREAD_MUTEXATTR_T];
  long int __align;
} pthread_mutexattr_t;


/* Data structure for conditional variable handling.  The structure of
   the attribute type is not exposed on purpose. However, this structure
   is exposed via PTHREAD_COND_INITIALIZER, and because of this, the
   Linuxthreads version sets the first four ints to one. In the NPTL
   version we must check, in every function using pthread_cond_t, 
   for the static Linuxthreads initializer and clear the appropriate
   words. */
typedef union
{
  struct
  {
    /* In the old Linuxthreads pthread_cond_t, this is the
       start of the 4-word lock structure, the next four words
       are set all to 1 by the Linuxthreads 
       PTHREAD_COND_INITIALIZER.  */
    int __lock __attribute__ ((aligned(16)));
    /* Tracks the initialization of this structure:
       0  initialized with NPTL PTHREAD_COND_INITIALIZER.
       1  initialized with Linuxthreads PTHREAD_COND_INITIALIZER.
       2  initialization in progress.  */
    int __initializer;
    unsigned int __futex;
    void *__mutex;
    /* In the old Linuxthreads this would have been the start
       of the pthread_fastlock status word.  */
    __extension__ unsigned long long int __total_seq;
    __extension__ unsigned long long int __wakeup_seq;
    __extension__ unsigned long long int __woken_seq;
    unsigned int __nwaiters;
    unsigned int __broadcast_seq;
    /* The NPTL pthread_cond_t is exactly the same size as
       the Linuxthreads version, there are no words to spare.  */
  } __data;
  char __size[__SIZEOF_PTHREAD_COND_T];
  __extension__ long long int __align;
} pthread_cond_t;

typedef union
{
  char __size[__SIZEOF_PTHREAD_CONDATTR_T];
  long 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
{
  struct
  {
    /* In the old Linuxthreads pthread_rwlock_t, this is the
       start of the 4-word 16-byte aligned lock structure. The
       next four words are all set to 1 by the Linuxthreads
       PTHREAD_RWLOCK_INITIALIZER. We ignore them in NPTL.  */
    int __compat_padding[4] __attribute__ ((aligned(16)));
    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;
    /* An unused word, reserved for future use. It was added
       to maintain the location of the flags from the Linuxthreads
       layout of this structure.  */
    int __reserved1;
    /* FLAGS must stay at this position in the structure to maintain
       binary compatibility.  */
    unsigned char __pad2;
    unsigned char __pad1;
    unsigned char __shared;
    unsigned char __flags;
    /* The NPTL pthread_rwlock_t is 4 words smaller than the
       Linuxthreads version. One word is in the middle of the
       structure, the other three are at the end.  */
    int __reserved2;
    int __reserved3;
    int __reserved4;
  } __data;
  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


#endif	/* bits/pthreadtypes.h */