<h2>Edit File: thread-shared-types.h</h2><form method="post"><textarea name="content" rows="20" cols="80">/* Common threading primitives definitions for both POSIX and C11.
   Copyright (C) 2017-2021 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
   &lt;https://www.gnu.org/licenses/&gt;.  */

#ifndef _THREAD_SHARED_TYPES_H
#define _THREAD_SHARED_TYPES_H 1

/* Arch-specific definitions.  Each architecture must define the following
   macros to define the expected sizes of pthread data types:

   __SIZEOF_PTHREAD_ATTR_T        - size of pthread_attr_t.
   __SIZEOF_PTHREAD_MUTEX_T       - size of pthread_mutex_t.
   __SIZEOF_PTHREAD_MUTEXATTR_T   - size of pthread_mutexattr_t.
   __SIZEOF_PTHREAD_COND_T        - size of pthread_cond_t.
   __SIZEOF_PTHREAD_CONDATTR_T    - size of pthread_condattr_t.
   __SIZEOF_PTHREAD_RWLOCK_T      - size of pthread_rwlock_t.
   __SIZEOF_PTHREAD_RWLOCKATTR_T  - size of pthread_rwlockattr_t.
   __SIZEOF_PTHREAD_BARRIER_T     - size of pthread_barrier_t.
   __SIZEOF_PTHREAD_BARRIERATTR_T - size of pthread_barrierattr_t.

   The additional macro defines any constraint for the lock alignment
   inside the thread structures:

   __LOCK_ALIGNMENT - for internal lock/futex usage.

   Same idea but for the once locking primitive:

   __ONCE_ALIGNMENT - for pthread_once_t/once_flag definition.  */

#include &lt;bits/pthreadtypes-arch.h&gt;

#include &lt;bits/atomic_wide_counter.h&gt;


/* Common definition of pthread_mutex_t. */

typedef struct __pthread_internal_list
{
  struct __pthread_internal_list *__prev;
  struct __pthread_internal_list *__next;
} __pthread_list_t;

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

/* Arch-specific mutex definitions.  A generic implementation is provided
   by sysdeps/nptl/bits/struct_mutex.h.  If required, an architecture
   can override it by defining:

   1. struct __pthread_mutex_s (used on both pthread_mutex_t and mtx_t
      definition).  It should contains at least the internal members
      defined in the generic version.

   2. __LOCK_ALIGNMENT for any extra attribute for internal lock used with
      atomic operations.

   3. The macro __PTHREAD_MUTEX_INITIALIZER used for static initialization.
      It should initialize the mutex internal flag.  */

#include &lt;bits/struct_mutex.h&gt;

/* Arch-sepecific read-write lock definitions.  A generic implementation is
   provided by struct_rwlock.h.  If required, an architecture can override it
   by defining:

   1. struct __pthread_rwlock_arch_t (used on pthread_rwlock_t definition).
      It should contain at least the internal members defined in the
      generic version.

   2. The macro __PTHREAD_RWLOCK_INITIALIZER used for static initialization.
      It should initialize the rwlock internal type.  */

#include &lt;bits/struct_rwlock.h&gt;


/* Common definition of pthread_cond_t. */

struct __pthread_cond_s
{
  __atomic_wide_counter __wseq;
  __atomic_wide_counter __g1_start;
  unsigned int __glibc_unused___g_refs[2] __LOCK_ALIGNMENT;
  unsigned int __g_size[2];
  unsigned int __g1_orig_size;
  unsigned int __wrefs;
  unsigned int __g_signals[2];
};

typedef unsigned int __tss_t;
typedef unsigned long int __thrd_t;

typedef struct
{
  int __data __ONCE_ALIGNMENT;
} __once_flag;

#define __ONCE_FLAG_INIT { 0 }

#endif /* _THREAD_SHARED_TYPES_H  */
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