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
|
/*
* RTLinux POSIX support
*
* Written by Michael Barabanov
* Copyright (C) Finite State Machine Labs Inc., 1999,2000
* Released under the terms of the GPL Version 2
*
*/
#include <rtl_sched.h>
#include <rtl_posix.h>
void rtl_posix_init (pthread_t th)
{
struct rtl_posix_thread_struct *posixdata = RTL_POSIX_DATA(th);
pthread_spin_init (&posixdata->exitlock, 0);
posixdata->joining_thread = 0;
posixdata->joined_thread_retval = 0;
}
void rtl_posix_cleanup(void *retval)
{
pthread_t self = pthread_self();
struct rtl_posix_thread_struct *posixdata = RTL_POSIX_DATA(self);
pthread_spin_lock (&posixdata->exitlock);
posixdata->retval = retval;
while (test_bit (RTL_THREAD_JOINABLE, &self->threadflags) && !posixdata->joining_thread) {
set_bit (RTL_THREAD_WAIT_FOR_JOIN, &self->threadflags);
RTL_MARK_SUSPENDED (self);
pthread_spin_unlock (&posixdata->exitlock);
rtl_schedule();
pthread_spin_lock (&posixdata->exitlock);
}
pthread_spin_unlock (&posixdata->exitlock);
}
void rtl_posix_on_delete(pthread_t th)
{
struct rtl_posix_thread_struct *posixdata = RTL_POSIX_DATA(th);
if (posixdata->joining_thread) {
struct rtl_thread_struct *joining_thread = posixdata->joining_thread;
struct rtl_posix_thread_struct *joindata = RTL_POSIX_DATA(joining_thread);
pthread_spin_lock (&joindata->exitlock);
joindata -> joined_thread_retval = posixdata -> retval;
set_bit (RTL_THREAD_OK_TO_FINISH_JOIN, &joining_thread->threadflags);
pthread_kill (joining_thread, RTL_SIGNAL_WAKEUP);
pthread_spin_unlock (&joindata->exitlock);
}
}
int pthread_join(pthread_t th, void **thread_return)
{
pthread_t self = pthread_self();
if (pthread_kill(th, 0)) {
return ESRCH;
}
if (self == th){
return EDEADLK;
}
pthread_spin_lock (&RTL_POSIX_DATA(th)->exitlock);
if (!test_bit (RTL_THREAD_JOINABLE, &th->threadflags)) {
pthread_spin_unlock (&RTL_POSIX_DATA(th)->exitlock);
return EINVAL;
}
RTL_POSIX_DATA(th)->joining_thread = pthread_self();
if (test_and_clear_bit(RTL_THREAD_WAIT_FOR_JOIN, &th->threadflags)) {
pthread_kill(th, RTL_SIGNAL_WAKEUP);
}
pthread_spin_unlock (&RTL_POSIX_DATA(th)->exitlock);
pthread_spin_lock (&RTL_POSIX_DATA(self)->exitlock);
while (!test_and_clear_bit (RTL_THREAD_OK_TO_FINISH_JOIN, &self->threadflags)) {
if (self != pthread_linux()) {
RTL_MARK_SUSPENDED (self);
} else {
current->state = TASK_UNINTERRUPTIBLE;
}
pthread_spin_unlock (&RTL_POSIX_DATA(self)->exitlock);
if (self != pthread_linux()) {
rtl_schedule();
} else {
schedule_timeout(HZ/5);
}
pthread_spin_lock (&RTL_POSIX_DATA(self)->exitlock);
}
pthread_spin_unlock (&RTL_POSIX_DATA(self)->exitlock);
if (thread_return) {
*thread_return = RTL_POSIX_DATA(self)->joined_thread_retval;
}
return 0;
}
int pthread_detach(pthread_t thread)
{
pthread_spin_lock (&RTL_POSIX_DATA(thread)->exitlock);
if (!test_bit(RTL_THREAD_JOINABLE, &thread->threadflags)) {
pthread_spin_unlock (&RTL_POSIX_DATA(thread)->exitlock);
return EINVAL;
}
clear_bit (RTL_THREAD_JOINABLE, &thread->threadflags);
if (test_and_clear_bit(RTL_THREAD_WAIT_FOR_JOIN, &thread->threadflags)) {
pthread_kill(thread, RTL_SIGNAL_WAKEUP);
}
pthread_spin_unlock (&RTL_POSIX_DATA(thread)->exitlock);
return 0;
}
|
