mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
/* Basic platform-independent macro definitions for mutexes,
|
|
thread-specific data and parameters for malloc.
|
|
Copyright (C) 2003-2014 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 _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)
|
|
# define MUTEX_INITIALIZER (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) */
|