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[akaros.git] / tools / compilers / gcc-glibc / glibc-2.14.1-ros / sysdeps / akaros / bits / stdio-lock.h
1 /* Thread package specific definitions of stream lock type.  NPTL version.
2    Copyright (C) 2000, 2001, 2002, 2003, 2007 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, write to the Free
17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18    02111-1307 USA.  */
19
20 #ifndef _BITS_STDIO_LOCK_H
21 #define _BITS_STDIO_LOCK_H 1
22
23 #include <bits/libc-lock.h>
24
25
26 /* The locking here is very inexpensive, even for inlining.  */
27 #define _IO_lock_inexpensive    1
28
29 typedef struct { int lock; int cnt; void *owner; } _IO_lock_t;
30
31 #define _IO_lock_initializer { LLL_LOCK_INITIALIZER, 0, NULL }
32
33 #define _IO_lock_init(_name) \
34   ((_name) = (_IO_lock_t) _IO_lock_initializer , 0)
35
36 #define _IO_lock_fini(_name) \
37   ((void) 0)
38
39 #define _IO_lock_lock(_name) \
40   do {                                                                        \
41     void *__self = THREAD_SELF;                                               \
42     if ((_name).owner != __self)                                              \
43       {                                                                       \
44         lll_lock ((_name).lock, LLL_PRIVATE);                                 \
45         (_name).owner = __self;                                               \
46       }                                                                       \
47     ++(_name).cnt;                                                            \
48   } while (0)
49
50 #define _IO_lock_trylock(_name) \
51   ({                                                                          \
52     int __result = 0;                                                         \
53     void *__self = THREAD_SELF;                                               \
54     if ((_name).owner != __self)                                              \
55       {                                                                       \
56         if (lll_trylock ((_name).lock) == 0)                                  \
57           {                                                                   \
58             (_name).owner = __self;                                           \
59             (_name).cnt = 1;                                                  \
60           }                                                                   \
61         else                                                                  \
62           __result = EBUSY;                                                   \
63       }                                                                       \
64     else                                                                      \
65       ++(_name).cnt;                                                          \
66     __result;                                                                 \
67   })
68
69 #define _IO_lock_unlock(_name) \
70   do {                                                                        \
71     if (--(_name).cnt == 0)                                                   \
72       {                                                                       \
73         (_name).owner = NULL;                                                 \
74         lll_unlock ((_name).lock, LLL_PRIVATE);                               \
75       }                                                                       \
76   } while (0)
77
78
79
80 #define _IO_cleanup_region_start(_fct, _fp) \
81   __libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp)
82 #define _IO_cleanup_region_start_noarg(_fct) \
83   __libc_cleanup_region_start (1, _fct, NULL)
84 #define _IO_cleanup_region_end(_doit) \
85   __libc_cleanup_region_end (_doit)
86
87 #if defined _LIBC && !defined NOT_IN_libc
88
89 # ifdef __EXCEPTIONS
90 #  define _IO_acquire_lock(_fp) \
91   do {                                                                        \
92     _IO_FILE *_IO_acquire_lock_file                                           \
93         __attribute__((cleanup (_IO_acquire_lock_fct)))                       \
94         = (_fp);                                                              \
95     _IO_flockfile (_IO_acquire_lock_file);
96 #  define _IO_acquire_lock_clear_flags2(_fp) \
97   do {                                                                        \
98     _IO_FILE *_IO_acquire_lock_file                                           \
99         __attribute__((cleanup (_IO_acquire_lock_clear_flags2_fct)))          \
100         = (_fp);                                                              \
101     _IO_flockfile (_IO_acquire_lock_file);
102 # else
103 #  define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled
104 #  define _IO_acquire_lock_clear_flags2(_fp) _IO_acquire_lock (_fp)
105 # endif
106 # define _IO_release_lock(_fp) ; } while (0)
107
108 #endif
109
110 #endif /* bits/stdio-lock.h */