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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/****************************************************************************
* common/up_exit.c
*
* Copyright (C) 2008-2009, 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sched.h>
#include <debug.h>
#include <nuttx/arch.h>
#include "chip/chip.h"
#include "os_internal.h"
#include "up_internal.h"
#ifdef CONFIG_DUMP_ON_EXIT
#include <nuttx/fs/fs.h>
#endif
/****************************************************************************
* Private Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: _up_dumponexit
*
* Description:
* Dump the state of all tasks whenever on task exits. This is debug
* instrumentation that was added to check file-related reference counting
* but could be useful again sometime in the future.
*
****************************************************************************/
#if defined(CONFIG_DUMP_ON_EXIT) && defined(CONFIG_DEBUG)
static void _up_dumponexit(FAR struct tcb_s *tcb, FAR void *arg)
{
#if CONFIG_NFILE_DESCRIPTORS > 0
FAR struct filelist *filelist;
#if CONFIG_NFILE_STREAMS > 0
FAR struct streamlist *streamlist;
#endif
int i;
#endif
lldbg(" TCB=%p name=%s\n", tcb, tcb->argv[0]);
lldbg(" priority=%d state=%d\n", tcb->sched_priority, tcb->task_state);
#if CONFIG_NFILE_DESCRIPTORS > 0
filelist = tcb->group->tg_filelist;
for (i = 0; i < CONFIG_NFILE_DESCRIPTORS; i++)
{
struct inode *inode = filelist->fl_files[i].f_inode;
if (inode)
{
lldbg(" fd=%d refcount=%d\n",
i, inode->i_crefs);
}
}
#endif
#if CONFIG_NFILE_STREAMS > 0
streamlist = tcb->group->tg_streamlist;
for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
{
struct file_struct *filep = &streamlist->sl_streams[i];
if (filep->fs_fd >= 0)
{
#if CONFIG_STDIO_BUFFER_SIZE > 0
lldbg(" fd=%d nbytes=%d\n",
filep->fs_fd,
filep->fs_bufpos - filep->fs_bufstart);
#else
lldbg(" fd=%d\n", filep->fs_fd);
#endif
}
}
#endif
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: _exit
*
* Description:
* This function causes the currently executing task to cease
* to exist. This is a special case of task_delete() where the task to
* be deleted is the currently executing task. It is more complex because
* a context switch must be perform to the next ready to run task.
*
****************************************************************************/
void _exit(int status)
{
FAR struct tcb_s* tcb;
/* Disable interrupts. Interrupts will remain disabled until
* the new task is resumed below.
*/
(void)irqsave();
slldbg("TCB=%p exitting\n", tcb);
#if defined(CONFIG_DUMP_ON_EXIT) && defined(CONFIG_DEBUG)
lldbg("Other tasks:\n");
sched_foreach(_up_dumponexit, NULL);
#endif
/* Destroy the task at the head of the ready to run list. */
(void)task_exit();
/* Now, perform the context switch to the new ready-to-run task at the
* head of the list.
*/
tcb = (FAR struct tcb_s*)g_readytorun.head;
slldbg("New Active Task TCB=%p\n", tcb);
/* Then switch contexts */
RESTORE_USERCONTEXT(tcb);
}
|
