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3c6904fb UD |
1 | /* Basic platform-independent macro definitions for mutexes, |
2 | thread-specific data and parameters for malloc. | |
b168057a | 3 | Copyright (C) 2003-2015 Free Software Foundation, Inc. |
3c6904fb UD |
4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
3c6904fb UD |
19 | |
20 | #ifndef _GENERIC_MALLOC_MACHINE_H | |
21 | #define _GENERIC_MALLOC_MACHINE_H | |
22 | ||
23 | #include <atomic.h> | |
24 | ||
25 | #ifndef mutex_init /* No threads, provide dummy macros */ | |
26 | ||
27 | # define NO_THREADS | |
28 | ||
29 | /* The mutex functions used to do absolutely nothing, i.e. lock, | |
30 | trylock and unlock would always just return 0. However, even | |
31 | without any concurrently active threads, a mutex can be used | |
32 | legitimately as an `in use' flag. To make the code that is | |
33 | protected by a mutex async-signal safe, these macros would have to | |
34 | be based on atomic test-and-set operations, for example. */ | |
35 | typedef int mutex_t; | |
36 | ||
750c1f2a | 37 | # define mutex_init(m) (*(m) = 0) |
32749f6c | 38 | # define mutex_lock(m) ({ *(m) = 1; 0; }) |
750c1f2a RM |
39 | # define mutex_trylock(m) (*(m) ? 1 : ((*(m) = 1), 0)) |
40 | # define mutex_unlock(m) (*(m) = 0) | |
41 | # define MUTEX_INITIALIZER (0) | |
3c6904fb UD |
42 | |
43 | typedef void *tsd_key_t; | |
44 | # define tsd_key_create(key, destr) do {} while(0) | |
45 | # define tsd_setspecific(key, data) ((key) = (data)) | |
46 | # define tsd_getspecific(key, vptr) (vptr = (key)) | |
47 | ||
48 | # define thread_atfork(prepare, parent, child) do {} while(0) | |
49 | ||
50 | #endif /* !defined mutex_init */ | |
51 | ||
52 | #ifndef atomic_full_barrier | |
53 | # define atomic_full_barrier() __asm ("" ::: "memory") | |
54 | #endif | |
55 | ||
56 | #ifndef atomic_read_barrier | |
57 | # define atomic_read_barrier() atomic_full_barrier () | |
58 | #endif | |
59 | ||
60 | #ifndef atomic_write_barrier | |
61 | # define atomic_write_barrier() atomic_full_barrier () | |
62 | #endif | |
63 | ||
64 | #ifndef DEFAULT_TOP_PAD | |
65 | # define DEFAULT_TOP_PAD 131072 | |
66 | #endif | |
67 | ||
68 | #endif /* !defined(_GENERIC_MALLOC_MACHINE_H) */ |