| /* 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) */ |