/* Basic platform-independent macro definitions for mutexes,

   thread-specific data and parameters for malloc.

   Copyright (C) 2003 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, write to the Free

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

   02111-1307 USA.  */

#ifndef _GENERIC_MALLOC_MACHINE_H

#define _GENERIC_MALLOC_MACHINE_H

#include <atomic.h>

#ifndef mutex_init /* No threads, provide dummy macros */

# define NO_THREADS

/* The mutex functions used to do absolutely nothing, i.e. lock,

   trylock and unlock would always just return 0.  However, even

   without any concurrently active threads, a mutex can be used

   legitimately as an `in use' flag.  To make the code that is

   protected by a mutex async-signal safe, these macros would have to

   be based on atomic test-and-set operations, for example. */

typedef int mutex_t;

# define mutex_init(m)              (*(m) = 0)

# define mutex_lock(m)              ((*(m) = 1), 0)

# define mutex_trylock(m)           (*(m) ? 1 : ((*(m) = 1), 0))

# define mutex_unlock(m)            (*(m) = 0)

typedef void *tsd_key_t;

# define tsd_key_create(key, destr) do {} while(0)

# define tsd_setspecific(key, data) ((key) = (data))

# define tsd_getspecific(key, vptr) (vptr = (key))

# define thread_atfork(prepare, parent, child) do {} while(0)

#endif /* !defined mutex_init */

#ifndef atomic_full_barrier

# define atomic_full_barrier() __asm ("" ::: "memory")

#endif

#ifndef atomic_read_barrier

# define atomic_read_barrier() atomic_full_barrier ()

#endif

#ifndef atomic_write_barrier

# define atomic_write_barrier() atomic_full_barrier ()

#endif

#ifndef DEFAULT_TOP_PAD

# define DEFAULT_TOP_PAD 131072

#endif

#endif /* !defined(_GENERIC_MALLOC_MACHINE_H) */