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
|
/*
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
*
* Solaris Porting Layer (SPL) Thread Implementation.
*/
#include <sys/thread.h>
#include <sys/kmem.h>
#include <sys/tsd.h>
/*
* Thread interfaces
*/
typedef struct thread_priv_s {
unsigned long tp_magic; /* Magic */
int tp_name_size; /* Name size */
char *tp_name; /* Name (without _thread suffix) */
void (*tp_func)(void *); /* Registered function */
void *tp_args; /* Args to be passed to function */
size_t tp_len; /* Len to be passed to function */
int tp_state; /* State to start thread at */
pri_t tp_pri; /* Priority to start threat at */
} thread_priv_t;
static int
thread_generic_wrapper(void *arg)
{
thread_priv_t *tp = (thread_priv_t *)arg;
void (*func)(void *);
void *args;
ASSERT(tp->tp_magic == TP_MAGIC);
func = tp->tp_func;
args = tp->tp_args;
set_current_state(tp->tp_state);
set_user_nice((kthread_t *)current, PRIO_TO_NICE(tp->tp_pri));
kmem_free(tp->tp_name, tp->tp_name_size);
kmem_free(tp, sizeof (thread_priv_t));
if (func)
func(args);
return (0);
}
void
__thread_exit(void)
{
tsd_exit();
complete_and_exit(NULL, 0);
/* Unreachable */
}
EXPORT_SYMBOL(__thread_exit);
/*
* thread_create() may block forever if it cannot create a thread or
* allocate memory. This is preferable to returning a NULL which Solaris
* style callers likely never check for... since it can't fail.
*/
kthread_t *
__thread_create(caddr_t stk, size_t stksize, thread_func_t func,
const char *name, void *args, size_t len, proc_t *pp, int state, pri_t pri)
{
thread_priv_t *tp;
struct task_struct *tsk;
char *p;
/* Option pp is simply ignored */
/* Variable stack size unsupported */
ASSERT(stk == NULL);
tp = kmem_alloc(sizeof (thread_priv_t), KM_PUSHPAGE);
if (tp == NULL)
return (NULL);
tp->tp_magic = TP_MAGIC;
tp->tp_name_size = strlen(name) + 1;
tp->tp_name = kmem_alloc(tp->tp_name_size, KM_PUSHPAGE);
if (tp->tp_name == NULL) {
kmem_free(tp, sizeof (thread_priv_t));
return (NULL);
}
strncpy(tp->tp_name, name, tp->tp_name_size);
/*
* Strip trailing "_thread" from passed name which will be the func
* name since the exposed API has no parameter for passing a name.
*/
p = strstr(tp->tp_name, "_thread");
if (p)
p[0] = '\0';
tp->tp_func = func;
tp->tp_args = args;
tp->tp_len = len;
tp->tp_state = state;
tp->tp_pri = pri;
tsk = spl_kthread_create(thread_generic_wrapper, (void *)tp,
"%s", tp->tp_name);
if (IS_ERR(tsk))
return (NULL);
wake_up_process(tsk);
return ((kthread_t *)tsk);
}
EXPORT_SYMBOL(__thread_create);
/*
* spl_kthread_create - Wrapper providing pre-3.13 semantics for
* kthread_create() in which it is not killable and less likely
* to return -ENOMEM.
*/
struct task_struct *
spl_kthread_create(int (*func)(void *), void *data, const char namefmt[], ...)
{
struct task_struct *tsk;
va_list args;
char name[TASK_COMM_LEN];
va_start(args, namefmt);
vsnprintf(name, sizeof (name), namefmt, args);
va_end(args);
do {
tsk = kthread_create(func, data, "%s", name);
if (IS_ERR(tsk)) {
if (signal_pending(current)) {
clear_thread_flag(TIF_SIGPENDING);
continue;
}
if (PTR_ERR(tsk) == -ENOMEM)
continue;
return (NULL);
} else {
return (tsk);
}
} while (1);
}
EXPORT_SYMBOL(spl_kthread_create);
|
