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
188
189
190
191
192
193
194
195
196
|
/*
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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 REGENTS 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.
*
*/
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
void _exit(int status)
{
int flags;
int i;
struct itimerval itimer;
/* Disable the interval timer: */
itimer.it_interval.tv_sec = 0;
itimer.it_interval.tv_usec = 0;
itimer.it_value.tv_sec = 0;
itimer.it_value.tv_usec = 0;
setitimer(ITIMER_VIRTUAL, &itimer, NULL);
/* Close the pthread kernel pipe: */
_thread_sys_close(_thread_kern_pipe[0]);
_thread_sys_close(_thread_kern_pipe[1]);
/*
* Enter a loop to set all file descriptors to blocking
* if they were not created as non-blocking:
*/
for (i = 0; i < _thread_dtablesize; i++) {
/* Check if this file descriptor is in use: */
if (_thread_fd_table[i] != NULL &&
!(_thread_fd_table[i]->flags & O_NONBLOCK)) {
/* Get the current flags: */
flags = _thread_sys_fcntl(i, F_GETFL, NULL);
/* Clear the nonblocking file descriptor flag: */
_thread_sys_fcntl(i, F_SETFL, flags & ~O_NONBLOCK);
}
}
/* Call the _exit syscall: */
_thread_sys__exit(status);
}
/*
* Append a small number onto the end of a string.
* This avoids the need to use sprintf, which is unsafe sometimes.
*/
static void
numlcat(char *s, int num, size_t size)
{
int i;
char digit[7];
if (num<0) {
num = -num;
strlcat(s, "-", size);
}
digit[sizeof digit - 1] = '\0';
for (i = sizeof digit - 2; i >= 0; i--) {
digit[i] = '0' + (num % 10);
num /= 10;
if (num == 0)
break;
}
if (i<0)
strlcat(s, "inf", size);
else
strlcat(s, &digit[i], size);
}
void
_thread_exit(const char *fname, int lineno, const char *string)
{
char s[256];
/* Prepare an error message string: */
strlcpy(s, "Fatal error '", sizeof s);
strlcat(s, string, sizeof s);
strlcat(s, "' at line ", sizeof s);
numlcat(s, lineno, sizeof s);
strlcat(s, " in file ", sizeof s);
strlcat(s, fname, sizeof s);
strlcat(s, " (errno = ", sizeof s);
numlcat(s, errno, sizeof s);
strlcat(s, ")\n", sizeof s);
/* Write the string to the standard error file descriptor: */
_thread_sys_write(2, s, strlen(s));
/* Write a dump of the current thread status: */
_thread_dump_info();
/* Force this process to exit: */
_exit(1);
}
void
pthread_exit(void *status)
{
pthread_t pthread;
/* Check if this thread is already in the process of exiting: */
if ((_thread_run->flags & PTHREAD_EXITING) != 0) {
char msg[128];
snprintf(msg,sizeof msg,"Thread %p has called pthread_exit() from a destructor. POSIX 1003.1 1996 s16.2.5.2 does not allow this!",_thread_run);
PANIC(msg);
}
/* Flag this thread as exiting: */
_thread_run->flags |= PTHREAD_EXITING;
/* Save the return value: */
_thread_run->ret = status;
while (_thread_run->cleanup != NULL) {
pthread_cleanup_pop(1);
}
if (_thread_run->attr.cleanup_attr != NULL) {
_thread_run->attr.cleanup_attr(_thread_run->attr.arg_attr);
}
/* Check if there is thread specific data: */
if (_thread_run->specific_data != NULL) {
/* Run the thread-specific data destructors: */
_thread_cleanupspecific();
}
/* Check if there are any threads joined to this one: */
while ((pthread = _thread_queue_deq(&(_thread_run->join_queue))) != NULL) {
/* Wake the joined thread and let it detach this thread: */
PTHREAD_NEW_STATE(pthread,PS_RUNNING);
}
/*
* Lock the garbage collector mutex to ensure that the garbage
* collector is not using the dead thread list.
*/
if (pthread_mutex_lock(&_gc_mutex) != 0)
PANIC("Cannot lock gc mutex");
/* Add this thread to the list of dead threads. */
_thread_run->nxt_dead = _thread_dead;
_thread_dead = _thread_run;
/*
* Signal the garbage collector thread that there is something
* to clean up.
*/
if (pthread_cond_signal(&_gc_cond) != 0)
PANIC("Cannot signal gc cond");
/* Unlock the garbage collector mutex: */
if (pthread_mutex_unlock(&_gc_mutex) != 0)
PANIC("Cannot lock gc mutex");
/* This thread will never be re-scheduled. */
_thread_kern_sched_state(PS_DEAD, __FILE__, __LINE__);
/* This point should not be reached. */
PANIC("Dead thread has resumed");
}
#endif
|
