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4b393c50 | 1 | /* |
716154c5 BB |
2 | * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. |
3 | * Copyright (C) 2007 The Regents of the University of California. | |
4 | * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). | |
5 | * Written by Brian Behlendorf <behlendorf1@llnl.gov>. | |
715f6251 BB |
6 | * UCRL-CODE-235197 |
7 | * | |
716154c5 | 8 | * This file is part of the SPL, Solaris Porting Layer. |
715f6251 | 9 | * |
716154c5 BB |
10 | * The SPL is free software; you can redistribute it and/or modify it |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation; either version 2 of the License, or (at your | |
13 | * option) any later version. | |
14 | * | |
15 | * The SPL is distributed in the hope that it will be useful, but WITHOUT | |
715f6251 BB |
16 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
17 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
18 | * for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
716154c5 | 21 | * with the SPL. If not, see <http://www.gnu.org/licenses/>. |
5461eefe | 22 | * |
716154c5 | 23 | * Solaris Porting Layer (SPL) Thread Implementation. |
4b393c50 | 24 | */ |
715f6251 | 25 | |
f4b37741 | 26 | #include <sys/thread.h> |
115aed0d | 27 | #include <sys/kmem.h> |
9fe45dc1 | 28 | #include <sys/tsd.h> |
84980ee0 | 29 | #include <sys/string.h> |
937879f1 | 30 | |
f1ca4da6 BB |
31 | /* |
32 | * Thread interfaces | |
33 | */ | |
34 | typedef struct thread_priv_s { | |
35 | unsigned long tp_magic; /* Magic */ | |
5461eefe BB |
36 | int tp_name_size; /* Name size */ |
37 | char *tp_name; /* Name (without _thread suffix) */ | |
f1ca4da6 BB |
38 | void (*tp_func)(void *); /* Registered function */ |
39 | void *tp_args; /* Args to be passed to function */ | |
40 | size_t tp_len; /* Len to be passed to function */ | |
41 | int tp_state; /* State to start thread at */ | |
42 | pri_t tp_pri; /* Priority to start threat at */ | |
f1ca4da6 BB |
43 | } thread_priv_t; |
44 | ||
f1b59d26 | 45 | static int |
f1ca4da6 BB |
46 | thread_generic_wrapper(void *arg) |
47 | { | |
48 | thread_priv_t *tp = (thread_priv_t *)arg; | |
49 | void (*func)(void *); | |
50 | void *args; | |
f1ca4da6 | 51 | |
937879f1 | 52 | ASSERT(tp->tp_magic == TP_MAGIC); |
f1ca4da6 BB |
53 | func = tp->tp_func; |
54 | args = tp->tp_args; | |
f1ca4da6 | 55 | set_current_state(tp->tp_state); |
44e406d7 | 56 | set_user_nice((kthread_t *)current, PRIO_TO_NICE(tp->tp_pri)); |
a97df54e | 57 | kmem_free(tp->tp_name, tp->tp_name_size); |
5461eefe | 58 | kmem_free(tp, sizeof (thread_priv_t)); |
f1ca4da6 | 59 | |
f1ca4da6 BB |
60 | if (func) |
61 | func(args); | |
62 | ||
5461eefe | 63 | return (0); |
f1ca4da6 BB |
64 | } |
65 | ||
5461eefe BB |
66 | /* |
67 | * thread_create() may block forever if it cannot create a thread or | |
f1ca4da6 | 68 | * allocate memory. This is preferable to returning a NULL which Solaris |
5461eefe BB |
69 | * style callers likely never check for... since it can't fail. |
70 | */ | |
f1ca4da6 | 71 | kthread_t * |
51f443a0 | 72 | __thread_create(caddr_t stk, size_t stksize, thread_func_t func, |
3673d032 | 73 | const char *name, void *args, size_t len, proc_t *pp, int state, pri_t pri) |
f1ca4da6 | 74 | { |
115aed0d | 75 | thread_priv_t *tp; |
968eccd1 | 76 | struct task_struct *tsk; |
a97df54e | 77 | char *p; |
f1ca4da6 BB |
78 | |
79 | /* Option pp is simply ignored */ | |
80 | /* Variable stack size unsupported */ | |
937879f1 | 81 | ASSERT(stk == NULL); |
f1ca4da6 | 82 | |
5461eefe | 83 | tp = kmem_alloc(sizeof (thread_priv_t), KM_PUSHPAGE); |
115aed0d | 84 | if (tp == NULL) |
8d9a23e8 | 85 | return (NULL); |
f1ca4da6 | 86 | |
115aed0d | 87 | tp->tp_magic = TP_MAGIC; |
a97df54e BB |
88 | tp->tp_name_size = strlen(name) + 1; |
89 | ||
3050c931 | 90 | tp->tp_name = kmem_alloc(tp->tp_name_size, KM_PUSHPAGE); |
5461eefe BB |
91 | if (tp->tp_name == NULL) { |
92 | kmem_free(tp, sizeof (thread_priv_t)); | |
8d9a23e8 | 93 | return (NULL); |
a97df54e BB |
94 | } |
95 | ||
7584fbe8 | 96 | strlcpy(tp->tp_name, name, tp->tp_name_size); |
a97df54e | 97 | |
5461eefe BB |
98 | /* |
99 | * Strip trailing "_thread" from passed name which will be the func | |
a97df54e BB |
100 | * name since the exposed API has no parameter for passing a name. |
101 | */ | |
102 | p = strstr(tp->tp_name, "_thread"); | |
103 | if (p) | |
104 | p[0] = '\0'; | |
105 | ||
115aed0d BB |
106 | tp->tp_func = func; |
107 | tp->tp_args = args; | |
108 | tp->tp_len = len; | |
109 | tp->tp_state = state; | |
110 | tp->tp_pri = pri; | |
f1ca4da6 | 111 | |
17a527cb | 112 | tsk = spl_kthread_create(thread_generic_wrapper, (void *)tp, |
5461eefe | 113 | "%s", tp->tp_name); |
8d9a23e8 BB |
114 | if (IS_ERR(tsk)) |
115 | return (NULL); | |
968eccd1 BB |
116 | |
117 | wake_up_process(tsk); | |
8d9a23e8 | 118 | return ((kthread_t *)tsk); |
f1ca4da6 | 119 | } |
f1b59d26 | 120 | EXPORT_SYMBOL(__thread_create); |
ed650dee TC |
121 | |
122 | /* | |
123 | * spl_kthread_create - Wrapper providing pre-3.13 semantics for | |
124 | * kthread_create() in which it is not killable and less likely | |
125 | * to return -ENOMEM. | |
126 | */ | |
127 | struct task_struct * | |
128 | spl_kthread_create(int (*func)(void *), void *data, const char namefmt[], ...) | |
129 | { | |
130 | struct task_struct *tsk; | |
131 | va_list args; | |
3ceb71e8 | 132 | char name[TASK_COMM_LEN]; |
ed650dee TC |
133 | |
134 | va_start(args, namefmt); | |
5461eefe | 135 | vsnprintf(name, sizeof (name), namefmt, args); |
3ceb71e8 | 136 | va_end(args); |
ed650dee | 137 | do { |
3ceb71e8 | 138 | tsk = kthread_create(func, data, "%s", name); |
ed650dee TC |
139 | if (IS_ERR(tsk)) { |
140 | if (signal_pending(current)) { | |
141 | clear_thread_flag(TIF_SIGPENDING); | |
142 | continue; | |
143 | } | |
144 | if (PTR_ERR(tsk) == -ENOMEM) | |
145 | continue; | |
146 | return (NULL); | |
8062b768 | 147 | } else { |
ed650dee | 148 | return (tsk); |
8062b768 | 149 | } |
ed650dee TC |
150 | } while (1); |
151 | } | |
152 | EXPORT_SYMBOL(spl_kthread_create); | |
414f7249 PD |
153 | |
154 | /* | |
155 | * The "why" argument indicates the allowable side-effects of the call: | |
156 | * | |
157 | * FORREAL: Extract the next pending signal from p_sig into p_cursig; | |
158 | * stop the process if a stop has been requested or if a traced signal | |
159 | * is pending. | |
160 | * | |
161 | * JUSTLOOKING: Don't stop the process, just indicate whether or not | |
162 | * a signal might be pending (FORREAL is needed to tell for sure). | |
163 | */ | |
164 | int | |
165 | issig(int why) | |
166 | { | |
167 | ASSERT(why == FORREAL || why == JUSTLOOKING); | |
168 | ||
169 | if (!signal_pending(current)) | |
170 | return (0); | |
171 | ||
172 | if (why != FORREAL) | |
173 | return (1); | |
174 | ||
175 | struct task_struct *task = current; | |
176 | spl_kernel_siginfo_t __info; | |
177 | sigset_t set; | |
178 | siginitsetinv(&set, 1ULL << (SIGSTOP - 1) | 1ULL << (SIGTSTP - 1)); | |
179 | sigorsets(&set, &task->blocked, &set); | |
180 | ||
181 | spin_lock_irq(&task->sighand->siglock); | |
a4623710 AZ |
182 | #ifdef HAVE_DEQUEUE_SIGNAL_4ARG |
183 | enum pid_type __type; | |
2e7f664f | 184 | if (dequeue_signal(task, &set, &__info, &__type) != 0) { |
a4623710 | 185 | #else |
2e7f664f | 186 | if (dequeue_signal(task, &set, &__info) != 0) { |
a4623710 | 187 | #endif |
414f7249 PD |
188 | #ifdef HAVE_SIGNAL_STOP |
189 | spin_unlock_irq(&task->sighand->siglock); | |
190 | kernel_signal_stop(); | |
191 | #else | |
192 | if (current->jobctl & JOBCTL_STOP_DEQUEUED) | |
193 | spl_set_special_state(TASK_STOPPED); | |
194 | ||
195 | spin_unlock_irq(¤t->sighand->siglock); | |
196 | ||
197 | schedule(); | |
198 | #endif | |
199 | return (0); | |
200 | } | |
201 | ||
202 | spin_unlock_irq(&task->sighand->siglock); | |
203 | ||
204 | return (1); | |
205 | } | |
206 | ||
207 | EXPORT_SYMBOL(issig); |