1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @brief Private Support Information for POSIX Shared Memory
*
*/
/*
* Copyright (c) 2016 Gedare Bloom.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RTEMS_POSIX_SHMIMPL_H
#define _RTEMS_POSIX_SHMIMPL_H
#include <rtems/fs.h>
#include <rtems/libio.h>
#include <rtems/posix/posixapi.h>
#include <rtems/posix/shm.h>
#include <rtems/score/objectimpl.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @ingroup POSIXShmPrivate
* @{
*/
RTEMS_INLINE_ROUTINE POSIX_Shm_Control *_POSIX_Shm_Allocate_unprotected( void )
{
return (POSIX_Shm_Control *)
_Objects_Allocate_unprotected( &_POSIX_Shm_Information );
}
/**
* @brief POSIX Shared Memory Free
*
* This routine frees a shm control block.
*/
RTEMS_INLINE_ROUTINE void _POSIX_Shm_Free (
POSIX_Shm_Control *the_shm
)
{
_Objects_Free( &_POSIX_Shm_Information, &the_shm->Object );
}
RTEMS_INLINE_ROUTINE POSIX_Shm_Control *_POSIX_Shm_Get_by_name(
const char *name,
size_t *name_length_p,
Objects_Get_by_name_error *error
)
{
return (POSIX_Shm_Control *) _Objects_Get_by_name(
&_POSIX_Shm_Information,
name,
name_length_p,
error
);
}
RTEMS_INLINE_ROUTINE void _POSIX_Shm_Update_atime(
POSIX_Shm_Control *shm
)
{
struct timeval now;
gettimeofday( &now, 0 );
shm->atime = now.tv_sec;
}
RTEMS_INLINE_ROUTINE void _POSIX_Shm_Update_mtime_ctime(
POSIX_Shm_Control *shm
)
{
struct timeval now;
gettimeofday( &now, 0 );
shm->mtime = now.tv_sec;
shm->ctime = now.tv_sec;
}
static inline POSIX_Shm_Control* iop_to_shm( rtems_libio_t *iop )
{
return (POSIX_Shm_Control*) iop->data1;
}
static inline POSIX_Shm_Control* loc_to_shm(
const rtems_filesystem_location_info_t *loc
)
{
return (POSIX_Shm_Control*) loc->node_access;
}
static inline int POSIX_Shm_Attempt_delete(
POSIX_Shm_Control* shm
)
{
Objects_Control *obj;
ISR_lock_Context lock_ctx;
int err;
err = 0;
_Objects_Allocator_lock();
--shm->reference_count;
if ( shm->reference_count == 0 ) {
if ( (*shm->shm_object.ops->object_delete)( &shm->shm_object ) != 0 ) {
err = EIO;
}
}
/* check if the object has been unlinked yet. */
obj = _Objects_Get( shm->Object.id, &lock_ctx, &_POSIX_Shm_Information );
if ( obj == NULL ) {
/* if it was unlinked, then it can be freed. */
_POSIX_Shm_Free( shm );
} else {
/* it will be freed when it is unlinked. */
_ISR_lock_ISR_enable( &lock_ctx );
}
_Objects_Allocator_unlock();
return err;
}
/** @} */
#ifdef __cplusplus
}
#endif
#endif
|
