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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/************************************************************************
* sched/sched_releasetcb.c
*
* Copyright (C) 2007, 2009, 2012-2013 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 <sys/types.h>
#include <sched.h>
#include <errno.h>
#include <nuttx/arch.h>
#include "os_internal.h"
#include "group_internal.h"
#include "timer_internal.h"
/************************************************************************
* Private Functions
************************************************************************/
/************************************************************************
* Name: sched_releasepid
*
* Description: When a task is destroyed, this function must
* be called to make its process ID available for re-use.
************************************************************************/
static void sched_releasepid(pid_t pid)
{
int hash_ndx = PIDHASH(pid);
/* Make any pid associated with this hash available. Note:
* no special precautions need be taken here because the
* following action is atomic
*/
g_pidhash[hash_ndx].tcb = NULL;
g_pidhash[hash_ndx].pid = INVALID_PROCESS_ID;
}
/************************************************************************
* Public Functions
************************************************************************/
/************************************************************************
* Name: sched_releasetcb
*
* Description:
* Free all resources contained in a TCB
*
* Parameters:
* None
*
* Return Value:
* OK on success; ERROR on failure
*
* Assumptions:
* Interrupts are disabled.
*
************************************************************************/
int sched_releasetcb(FAR struct tcb_s *tcb)
{
int ret = OK;
int i;
if (tcb)
{
/* Relase any timers that the task might hold. We do this
* before release the PID because it may still be trying to
* deliver signals (although interrupts are should be
* disabled here).
*/
#ifndef CONFIG_DISABLE_POSIX_TIMERS
#ifdef CONFIG_HAVE_WEAKFUNCTIONS
if (timer_deleteall != NULL)
#endif
{
timer_deleteall(tcb->pid);
}
#endif
/* Release the task's process ID if one was assigned. PID
* zero is reserved for the IDLE task. The TCB of the IDLE
* task is never release so a value of zero simply means that
* the process ID was never allocated to this TCB.
*/
if (tcb->pid)
{
sched_releasepid(tcb->pid);
}
/* Delete the thread's stack if one has been allocated */
#ifndef CONFIG_CUSTOM_STACK
if (tcb->stack_alloc_ptr)
{
up_release_stack(tcb);
}
#endif
/* Delete the tasks's allocated DSpace region (external modules only) */
#ifdef CONFIG_PIC
if (tcb->dspace)
{
if (tcb->dspace->crefs <= 1)
{
sched_kfree(tcb->dspace);
}
else
{
tcb->dspace->crefs--;
}
}
#endif
/* Release command line arguments that were allocated for task
* start/re-start.
*/
#ifndef CONFIG_DISABLE_PTHREAD
if ((tcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_PTHREAD)
#endif
{
FAR struct task_tcb_s *ttcb = (FAR struct task_tcb_s *)tcb;
for (i = 1; i < CONFIG_MAX_TASK_ARGS+1 && ttcb->argv[i]; i++)
{
sched_kfree((FAR void*)ttcb->argv[i]);
}
}
/* Release this thread's reference to the address environment */
#ifdef CONFIG_ADDRENV
ret = up_addrenv_release(tcb);
#endif
/* Leave the group (if we did not already leady in task_exithook.c) */
#ifdef HAVE_TASK_GROUP
group_leave(tcb);
#endif
/* And, finally, release the TCB itself */
sched_kfree(tcb);
}
return ret;
}
|