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1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2004 Jakub Jermar |
2 | * Copyright (c) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup genericproc |
29 | /** @addtogroup genericproc |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief Task management. |
35 | * @brief Task management. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <main/uinit.h> |
38 | #include <main/uinit.h> |
39 | #include <proc/thread.h> |
39 | #include <proc/thread.h> |
40 | #include <proc/task.h> |
40 | #include <proc/task.h> |
41 | #include <proc/uarg.h> |
41 | #include <proc/uarg.h> |
42 | #include <mm/as.h> |
42 | #include <mm/as.h> |
43 | #include <mm/slab.h> |
43 | #include <mm/slab.h> |
44 | #include <synch/spinlock.h> |
44 | #include <synch/spinlock.h> |
45 | #include <arch.h> |
45 | #include <arch.h> |
46 | #include <panic.h> |
46 | #include <panic.h> |
47 | #include <adt/btree.h> |
47 | #include <adt/btree.h> |
48 | #include <adt/list.h> |
48 | #include <adt/list.h> |
49 | #include <ipc/ipc.h> |
49 | #include <ipc/ipc.h> |
50 | #include <security/cap.h> |
50 | #include <security/cap.h> |
51 | #include <memstr.h> |
51 | #include <memstr.h> |
52 | #include <print.h> |
52 | #include <print.h> |
53 | #include <lib/elf.h> |
53 | #include <lib/elf.h> |
54 | #include <errno.h> |
54 | #include <errno.h> |
55 | #include <func.h> |
55 | #include <func.h> |
56 | #include <syscall/copy.h> |
56 | #include <syscall/copy.h> |
57 | #include <console/klog.h> |
57 | #include <console/klog.h> |
58 | 58 | ||
59 | #ifndef LOADED_PROG_STACK_PAGES_NO |
59 | #ifndef LOADED_PROG_STACK_PAGES_NO |
60 | #define LOADED_PROG_STACK_PAGES_NO 1 |
60 | #define LOADED_PROG_STACK_PAGES_NO 1 |
61 | #endif |
61 | #endif |
62 | 62 | ||
63 | /** Spinlock protecting the tasks_btree B+tree. */ |
63 | /** Spinlock protecting the tasks_btree B+tree. */ |
64 | SPINLOCK_INITIALIZE(tasks_lock); |
64 | SPINLOCK_INITIALIZE(tasks_lock); |
65 | 65 | ||
66 | /** B+tree of active tasks. |
66 | /** B+tree of active tasks. |
67 | * |
67 | * |
68 | * The task is guaranteed to exist after it was found in the tasks_btree as |
68 | * The task is guaranteed to exist after it was found in the tasks_btree as |
69 | * long as: |
69 | * long as: |
70 | * @li the tasks_lock is held, |
70 | * @li the tasks_lock is held, |
71 | * @li the task's lock is held when task's lock is acquired before releasing |
71 | * @li the task's lock is held when task's lock is acquired before releasing |
72 | * tasks_lock or |
72 | * tasks_lock or |
73 | * @li the task's refcount is greater than 0 |
73 | * @li the task's refcount is greater than 0 |
74 | * |
74 | * |
75 | */ |
75 | */ |
76 | btree_t tasks_btree; |
76 | btree_t tasks_btree; |
77 | 77 | ||
78 | static task_id_t task_counter = 0; |
78 | static task_id_t task_counter = 0; |
79 | 79 | ||
80 | static void ktaskclnp(void *arg); |
80 | static void ktaskclnp(void *arg); |
81 | static void ktaskgc(void *arg); |
81 | static void ktaskgc(void *arg); |
82 | 82 | ||
83 | /** Initialize tasks |
83 | /** Initialize tasks |
84 | * |
84 | * |
85 | * Initialize kernel tasks support. |
85 | * Initialize kernel tasks support. |
86 | * |
86 | * |
87 | */ |
87 | */ |
88 | void task_init(void) |
88 | void task_init(void) |
89 | { |
89 | { |
90 | TASK = NULL; |
90 | TASK = NULL; |
91 | btree_create(&tasks_btree); |
91 | btree_create(&tasks_btree); |
92 | } |
92 | } |
93 | 93 | ||
94 | 94 | ||
95 | /** Create new task |
95 | /** Create new task |
96 | * |
96 | * |
97 | * Create new task with no threads. |
97 | * Create new task with no threads. |
98 | * |
98 | * |
99 | * @param as Task's address space. |
99 | * @param as Task's address space. |
100 | * @param name Symbolic name. |
100 | * @param name Symbolic name. |
101 | * |
101 | * |
102 | * @return New task's structure |
102 | * @return New task's structure |
103 | * |
103 | * |
104 | */ |
104 | */ |
105 | task_t *task_create(as_t *as, char *name) |
105 | task_t *task_create(as_t *as, char *name) |
106 | { |
106 | { |
107 | ipl_t ipl; |
107 | ipl_t ipl; |
108 | task_t *ta; |
108 | task_t *ta; |
109 | int i; |
109 | int i; |
110 | 110 | ||
111 | ta = (task_t *) malloc(sizeof(task_t), 0); |
111 | ta = (task_t *) malloc(sizeof(task_t), 0); |
112 | 112 | ||
113 | task_create_arch(ta); |
113 | task_create_arch(ta); |
114 | 114 | ||
115 | spinlock_initialize(&ta->lock, "task_ta_lock"); |
115 | spinlock_initialize(&ta->lock, "task_ta_lock"); |
116 | list_initialize(&ta->th_head); |
116 | list_initialize(&ta->th_head); |
117 | ta->as = as; |
117 | ta->as = as; |
118 | ta->name = name; |
118 | ta->name = name; |
119 | ta->main_thread = NULL; |
119 | ta->main_thread = NULL; |
120 | ta->refcount = 0; |
120 | ta->refcount = 0; |
121 | ta->context = CONTEXT; |
121 | ta->context = CONTEXT; |
122 | 122 | ||
123 | ta->capabilities = 0; |
123 | ta->capabilities = 0; |
124 | ta->accept_new_threads = true; |
124 | ta->accept_new_threads = true; |
125 | ta->cycles = 0; |
125 | ta->cycles = 0; |
126 | 126 | ||
127 | ipc_answerbox_init(&ta->answerbox); |
127 | ipc_answerbox_init(&ta->answerbox); |
128 | for (i = 0; i < IPC_MAX_PHONES; i++) |
128 | for (i = 0; i < IPC_MAX_PHONES; i++) |
129 | ipc_phone_init(&ta->phones[i]); |
129 | ipc_phone_init(&ta->phones[i]); |
130 | if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context, |
130 | if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context, |
131 | ta->context))) |
131 | ta->context))) |
132 | ipc_phone_connect(&ta->phones[0], ipc_phone_0); |
132 | ipc_phone_connect(&ta->phones[0], ipc_phone_0); |
133 | atomic_set(&ta->active_calls, 0); |
133 | atomic_set(&ta->active_calls, 0); |
134 | 134 | ||
135 | mutex_initialize(&ta->futexes_lock); |
135 | mutex_initialize(&ta->futexes_lock); |
136 | btree_create(&ta->futexes); |
136 | btree_create(&ta->futexes); |
137 | 137 | ||
138 | ipl = interrupts_disable(); |
138 | ipl = interrupts_disable(); |
139 | 139 | ||
140 | /* |
140 | /* |
141 | * Increment address space reference count. |
141 | * Increment address space reference count. |
142 | * TODO: Reconsider the locking scheme. |
142 | * TODO: Reconsider the locking scheme. |
143 | */ |
143 | */ |
144 | mutex_lock(&as->lock); |
144 | mutex_lock(&as->lock); |
145 | as->refcount++; |
145 | as->refcount++; |
146 | mutex_unlock(&as->lock); |
146 | mutex_unlock(&as->lock); |
147 | 147 | ||
148 | spinlock_lock(&tasks_lock); |
148 | spinlock_lock(&tasks_lock); |
149 | 149 | ||
150 | ta->taskid = ++task_counter; |
150 | ta->taskid = ++task_counter; |
151 | btree_insert(&tasks_btree, (btree_key_t) ta->taskid, (void *) ta, NULL); |
151 | btree_insert(&tasks_btree, (btree_key_t) ta->taskid, (void *) ta, NULL); |
152 | 152 | ||
153 | spinlock_unlock(&tasks_lock); |
153 | spinlock_unlock(&tasks_lock); |
154 | interrupts_restore(ipl); |
154 | interrupts_restore(ipl); |
155 | 155 | ||
156 | return ta; |
156 | return ta; |
157 | } |
157 | } |
158 | 158 | ||
159 | /** Destroy task. |
159 | /** Destroy task. |
160 | * |
160 | * |
161 | * @param t Task to be destroyed. |
161 | * @param t Task to be destroyed. |
162 | */ |
162 | */ |
163 | void task_destroy(task_t *t) |
163 | void task_destroy(task_t *t) |
164 | { |
164 | { |
165 | task_destroy_arch(t); |
165 | task_destroy_arch(t); |
166 | btree_destroy(&t->futexes); |
166 | btree_destroy(&t->futexes); |
167 | 167 | ||
168 | mutex_lock_active(&t->as->lock); |
168 | mutex_lock_active(&t->as->lock); |
169 | if (--t->as->refcount == 0) { |
169 | if (--t->as->refcount == 0) { |
170 | mutex_unlock(&t->as->lock); |
170 | mutex_unlock(&t->as->lock); |
171 | as_destroy(t->as); |
171 | as_destroy(t->as); |
172 | /* |
172 | /* |
173 | * t->as is destroyed. |
173 | * t->as is destroyed. |
174 | */ |
174 | */ |
175 | } else |
175 | } else |
176 | mutex_unlock(&t->as->lock); |
176 | mutex_unlock(&t->as->lock); |
177 | 177 | ||
178 | free(t); |
178 | free(t); |
179 | TASK = NULL; |
179 | TASK = NULL; |
180 | } |
180 | } |
181 | 181 | ||
182 | /** Create new task with 1 thread and run it |
182 | /** Create new task with 1 thread and run it |
183 | * |
183 | * |
184 | * @param program_addr Address of program executable image. |
184 | * @param program_addr Address of program executable image. |
185 | * @param name Program name. |
185 | * @param name Program name. |
186 | * |
186 | * |
187 | * @return Task of the running program or NULL on error. |
187 | * @return Task of the running program or NULL on error. |
188 | */ |
188 | */ |
189 | task_t * task_run_program(void *program_addr, char *name) |
189 | task_t * task_run_program(void *program_addr, char *name) |
190 | { |
190 | { |
191 | as_t *as; |
191 | as_t *as; |
192 | as_area_t *a; |
192 | as_area_t *a; |
193 | int rc; |
193 | int rc; |
194 | thread_t *t1, *t2; |
194 | thread_t *t1, *t2; |
195 | task_t *task; |
195 | task_t *task; |
196 | uspace_arg_t *kernel_uarg; |
196 | uspace_arg_t *kernel_uarg; |
197 | 197 | ||
198 | as = as_create(0); |
198 | as = as_create(0); |
199 | ASSERT(as); |
199 | ASSERT(as); |
200 | 200 | ||
201 | rc = elf_load((elf_header_t *) program_addr, as); |
201 | rc = elf_load((elf_header_t *) program_addr, as); |
202 | if (rc != EE_OK) { |
202 | if (rc != EE_OK) { |
203 | as_destroy(as); |
203 | as_destroy(as); |
204 | return NULL; |
204 | return NULL; |
205 | } |
205 | } |
206 | 206 | ||
207 | kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0); |
207 | kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0); |
208 | kernel_uarg->uspace_entry = |
208 | kernel_uarg->uspace_entry = |
209 | (void *) ((elf_header_t *) program_addr)->e_entry; |
209 | (void *) ((elf_header_t *) program_addr)->e_entry; |
210 | kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS; |
210 | kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS; |
211 | kernel_uarg->uspace_thread_function = NULL; |
211 | kernel_uarg->uspace_thread_function = NULL; |
212 | kernel_uarg->uspace_thread_arg = NULL; |
212 | kernel_uarg->uspace_thread_arg = NULL; |
213 | kernel_uarg->uspace_uarg = NULL; |
213 | kernel_uarg->uspace_uarg = NULL; |
214 | 214 | ||
215 | task = task_create(as, name); |
215 | task = task_create(as, name); |
216 | ASSERT(task); |
216 | ASSERT(task); |
217 | 217 | ||
218 | /* |
218 | /* |
219 | * Create the data as_area. |
219 | * Create the data as_area. |
220 | */ |
220 | */ |
221 | a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE, |
221 | a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE, |
222 | LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS, |
222 | LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS, |
223 | AS_AREA_ATTR_NONE, &anon_backend, NULL); |
223 | AS_AREA_ATTR_NONE, &anon_backend, NULL); |
224 | 224 | ||
225 | /* |
225 | /* |
226 | * Create the main thread. |
226 | * Create the main thread. |
227 | */ |
227 | */ |
228 | t1 = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE, |
228 | t1 = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE, |
229 | "uinit", false); |
229 | "uinit", false); |
230 | ASSERT(t1); |
230 | ASSERT(t1); |
231 | 231 | ||
232 | /* |
232 | /* |
233 | * Create killer thread for the new task. |
233 | * Create killer thread for the new task. |
234 | */ |
234 | */ |
235 | t2 = thread_create(ktaskgc, t1, task, 0, "ktaskgc", true); |
235 | t2 = thread_create(ktaskgc, t1, task, 0, "ktaskgc", true); |
236 | ASSERT(t2); |
236 | ASSERT(t2); |
237 | thread_ready(t2); |
237 | thread_ready(t2); |
238 | 238 | ||
239 | thread_ready(t1); |
239 | thread_ready(t1); |
240 | 240 | ||
241 | return task; |
241 | return task; |
242 | } |
242 | } |
243 | 243 | ||
244 | /** Syscall for reading task ID from userspace. |
244 | /** Syscall for reading task ID from userspace. |
245 | * |
245 | * |
246 | * @param uspace_task_id Userspace address of 8-byte buffer where to store |
246 | * @param uspace_task_id Userspace address of 8-byte buffer where to store |
247 | * current task ID. |
247 | * current task ID. |
248 | * |
248 | * |
249 | * @return 0 on success or an error code from @ref errno.h. |
249 | * @return 0 on success or an error code from @ref errno.h. |
250 | */ |
250 | */ |
251 | unative_t sys_task_get_id(task_id_t *uspace_task_id) |
251 | unative_t sys_task_get_id(task_id_t *uspace_task_id) |
252 | { |
252 | { |
253 | /* |
253 | /* |
254 | * No need to acquire lock on TASK because taskid |
254 | * No need to acquire lock on TASK because taskid |
255 | * remains constant for the lifespan of the task. |
255 | * remains constant for the lifespan of the task. |
256 | */ |
256 | */ |
257 | return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid, |
257 | return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid, |
258 | sizeof(TASK->taskid)); |
258 | sizeof(TASK->taskid)); |
259 | } |
259 | } |
260 | 260 | ||
261 | /** Find task structure corresponding to task ID. |
261 | /** Find task structure corresponding to task ID. |
262 | * |
262 | * |
263 | * The tasks_lock must be already held by the caller of this function |
263 | * The tasks_lock must be already held by the caller of this function |
264 | * and interrupts must be disabled. |
264 | * and interrupts must be disabled. |
265 | * |
265 | * |
266 | * @param id Task ID. |
266 | * @param id Task ID. |
267 | * |
267 | * |
268 | * @return Task structure address or NULL if there is no such task ID. |
268 | * @return Task structure address or NULL if there is no such task ID. |
269 | */ |
269 | */ |
270 | task_t *task_find_by_id(task_id_t id) |
270 | task_t *task_find_by_id(task_id_t id) |
271 | { |
271 | { |
272 | btree_node_t *leaf; |
272 | btree_node_t *leaf; |
273 | 273 | ||
274 | return (task_t *) btree_search(&tasks_btree, (btree_key_t) id, &leaf); |
274 | return (task_t *) btree_search(&tasks_btree, (btree_key_t) id, &leaf); |
275 | } |
275 | } |
276 | 276 | ||
277 | /** Get accounting data of given task. |
277 | /** Get accounting data of given task. |
278 | * |
278 | * |
279 | * Note that task lock of 't' must be already held and |
279 | * Note that task lock of 't' must be already held and |
280 | * interrupts must be already disabled. |
280 | * interrupts must be already disabled. |
281 | * |
281 | * |
282 | * @param t Pointer to thread. |
282 | * @param t Pointer to thread. |
283 | * |
283 | * |
284 | */ |
284 | */ |
285 | uint64_t task_get_accounting(task_t *t) |
285 | uint64_t task_get_accounting(task_t *t) |
286 | { |
286 | { |
287 | /* Accumulated value of task */ |
287 | /* Accumulated value of task */ |
288 | uint64_t ret = t->cycles; |
288 | uint64_t ret = t->cycles; |
289 | 289 | ||
290 | /* Current values of threads */ |
290 | /* Current values of threads */ |
291 | link_t *cur; |
291 | link_t *cur; |
292 | for (cur = t->th_head.next; cur != &t->th_head; cur = cur->next) { |
292 | for (cur = t->th_head.next; cur != &t->th_head; cur = cur->next) { |
293 | thread_t *thr = list_get_instance(cur, thread_t, th_link); |
293 | thread_t *thr = list_get_instance(cur, thread_t, th_link); |
294 | 294 | ||
295 | spinlock_lock(&thr->lock); |
295 | spinlock_lock(&thr->lock); |
296 | /* Process only counted threads */ |
296 | /* Process only counted threads */ |
297 | if (!thr->uncounted) { |
297 | if (!thr->uncounted) { |
298 | if (thr == THREAD) { |
298 | if (thr == THREAD) { |
299 | /* Update accounting of current thread */ |
299 | /* Update accounting of current thread */ |
300 | thread_update_accounting(); |
300 | thread_update_accounting(); |
301 | } |
301 | } |
302 | ret += thr->cycles; |
302 | ret += thr->cycles; |
303 | } |
303 | } |
304 | spinlock_unlock(&thr->lock); |
304 | spinlock_unlock(&thr->lock); |
305 | } |
305 | } |
306 | 306 | ||
307 | return ret; |
307 | return ret; |
308 | } |
308 | } |
309 | 309 | ||
310 | /** Kill task. |
310 | /** Kill task. |
311 | * |
311 | * |
312 | * @param id ID of the task to be killed. |
312 | * @param id ID of the task to be killed. |
313 | * |
313 | * |
314 | * @return 0 on success or an error code from errno.h |
314 | * @return 0 on success or an error code from errno.h |
315 | */ |
315 | */ |
316 | int task_kill(task_id_t id) |
316 | int task_kill(task_id_t id) |
317 | { |
317 | { |
318 | ipl_t ipl; |
318 | ipl_t ipl; |
319 | task_t *ta; |
319 | task_t *ta; |
320 | thread_t *t; |
320 | thread_t *t; |
321 | link_t *cur; |
321 | link_t *cur; |
322 | 322 | ||
323 | if (id == 1) |
323 | if (id == 1) |
324 | return EPERM; |
324 | return EPERM; |
325 | 325 | ||
326 | ipl = interrupts_disable(); |
326 | ipl = interrupts_disable(); |
327 | spinlock_lock(&tasks_lock); |
327 | spinlock_lock(&tasks_lock); |
328 | 328 | ||
329 | if (!(ta = task_find_by_id(id))) { |
329 | if (!(ta = task_find_by_id(id))) { |
330 | spinlock_unlock(&tasks_lock); |
330 | spinlock_unlock(&tasks_lock); |
331 | interrupts_restore(ipl); |
331 | interrupts_restore(ipl); |
332 | return ENOENT; |
332 | return ENOENT; |
333 | } |
333 | } |
334 | 334 | ||
335 | spinlock_lock(&ta->lock); |
335 | spinlock_lock(&ta->lock); |
336 | ta->refcount++; |
336 | ta->refcount++; |
337 | spinlock_unlock(&ta->lock); |
337 | spinlock_unlock(&ta->lock); |
338 | 338 | ||
339 | btree_remove(&tasks_btree, ta->taskid, NULL); |
339 | btree_remove(&tasks_btree, ta->taskid, NULL); |
340 | spinlock_unlock(&tasks_lock); |
340 | spinlock_unlock(&tasks_lock); |
341 | 341 | ||
342 | t = thread_create(ktaskclnp, NULL, ta, 0, "ktaskclnp", true); |
342 | t = thread_create(ktaskclnp, NULL, ta, 0, "ktaskclnp", true); |
343 | 343 | ||
344 | spinlock_lock(&ta->lock); |
344 | spinlock_lock(&ta->lock); |
345 | ta->accept_new_threads = false; |
345 | ta->accept_new_threads = false; |
346 | ta->refcount--; |
346 | ta->refcount--; |
347 | 347 | ||
348 | /* |
348 | /* |
349 | * Interrupt all threads except ktaskclnp. |
349 | * Interrupt all threads except ktaskclnp. |
350 | */ |
350 | */ |
351 | for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) { |
351 | for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) { |
352 | thread_t *thr; |
352 | thread_t *thr; |
353 | bool sleeping = false; |
353 | bool sleeping = false; |
354 | 354 | ||
355 | thr = list_get_instance(cur, thread_t, th_link); |
355 | thr = list_get_instance(cur, thread_t, th_link); |
356 | if (thr == t) |
356 | if (thr == t) |
357 | continue; |
357 | continue; |
358 | 358 | ||
359 | spinlock_lock(&thr->lock); |
359 | spinlock_lock(&thr->lock); |
360 | thr->interrupted = true; |
360 | thr->interrupted = true; |
361 | if (thr->state == Sleeping) |
361 | if (thr->state == Sleeping) |
362 | sleeping = true; |
362 | sleeping = true; |
363 | spinlock_unlock(&thr->lock); |
363 | spinlock_unlock(&thr->lock); |
364 | 364 | ||
365 | if (sleeping) |
365 | if (sleeping) |
366 | waitq_interrupt_sleep(thr); |
366 | thread_interrupt_sleep(thr); |
367 | } |
367 | } |
368 | 368 | ||
369 | spinlock_unlock(&ta->lock); |
369 | spinlock_unlock(&ta->lock); |
370 | interrupts_restore(ipl); |
370 | interrupts_restore(ipl); |
371 | 371 | ||
372 | if (t) |
372 | if (t) |
373 | thread_ready(t); |
373 | thread_ready(t); |
374 | 374 | ||
375 | return 0; |
375 | return 0; |
376 | } |
376 | } |
377 | 377 | ||
378 | /** Print task list */ |
378 | /** Print task list */ |
379 | void task_print_list(void) |
379 | void task_print_list(void) |
380 | { |
380 | { |
381 | link_t *cur; |
381 | link_t *cur; |
382 | ipl_t ipl; |
382 | ipl_t ipl; |
383 | 383 | ||
384 | /* Messing with thread structures, avoid deadlock */ |
384 | /* Messing with thread structures, avoid deadlock */ |
385 | ipl = interrupts_disable(); |
385 | ipl = interrupts_disable(); |
386 | spinlock_lock(&tasks_lock); |
386 | spinlock_lock(&tasks_lock); |
387 | 387 | ||
388 | printf("taskid name ctx address as cycles threads " |
388 | printf("taskid name ctx address as cycles threads " |
389 | "calls callee\n"); |
389 | "calls callee\n"); |
390 | printf("------ ---------- --- ---------- ---------- ---------- ------- " "------ ------>\n"); |
390 | printf("------ ---------- --- ---------- ---------- ---------- ------- " "------ ------>\n"); |
391 | 391 | ||
392 | for (cur = tasks_btree.leaf_head.next; cur != &tasks_btree.leaf_head; |
392 | for (cur = tasks_btree.leaf_head.next; cur != &tasks_btree.leaf_head; |
393 | cur = cur->next) { |
393 | cur = cur->next) { |
394 | btree_node_t *node; |
394 | btree_node_t *node; |
395 | int i; |
395 | int i; |
396 | 396 | ||
397 | node = list_get_instance(cur, btree_node_t, leaf_link); |
397 | node = list_get_instance(cur, btree_node_t, leaf_link); |
398 | for (i = 0; i < node->keys; i++) { |
398 | for (i = 0; i < node->keys; i++) { |
399 | task_t *t; |
399 | task_t *t; |
400 | int j; |
400 | int j; |
401 | 401 | ||
402 | t = (task_t *) node->value[i]; |
402 | t = (task_t *) node->value[i]; |
403 | 403 | ||
404 | spinlock_lock(&t->lock); |
404 | spinlock_lock(&t->lock); |
405 | 405 | ||
406 | uint64_t cycles; |
406 | uint64_t cycles; |
407 | char suffix; |
407 | char suffix; |
408 | order(task_get_accounting(t), &cycles, &suffix); |
408 | order(task_get_accounting(t), &cycles, &suffix); |
409 | 409 | ||
410 | printf("%-6lld %-10s %-3ld %#10zx %#10zx %9llu%c %7zd " |
410 | printf("%-6lld %-10s %-3ld %#10zx %#10zx %9llu%c %7zd " |
411 | "%6zd", t->taskid, t->name, t->context, t, t->as, |
411 | "%6zd", t->taskid, t->name, t->context, t, t->as, |
412 | cycles, suffix, t->refcount, |
412 | cycles, suffix, t->refcount, |
413 | atomic_get(&t->active_calls)); |
413 | atomic_get(&t->active_calls)); |
414 | for (j = 0; j < IPC_MAX_PHONES; j++) { |
414 | for (j = 0; j < IPC_MAX_PHONES; j++) { |
415 | if (t->phones[j].callee) |
415 | if (t->phones[j].callee) |
416 | printf(" %zd:%#zx", j, |
416 | printf(" %zd:%#zx", j, |
417 | t->phones[j].callee); |
417 | t->phones[j].callee); |
418 | } |
418 | } |
419 | printf("\n"); |
419 | printf("\n"); |
420 | 420 | ||
421 | spinlock_unlock(&t->lock); |
421 | spinlock_unlock(&t->lock); |
422 | } |
422 | } |
423 | } |
423 | } |
424 | 424 | ||
425 | spinlock_unlock(&tasks_lock); |
425 | spinlock_unlock(&tasks_lock); |
426 | interrupts_restore(ipl); |
426 | interrupts_restore(ipl); |
427 | } |
427 | } |
428 | 428 | ||
429 | /** Kernel thread used to cleanup the task after it is killed. */ |
429 | /** Kernel thread used to cleanup the task after it is killed. */ |
430 | void ktaskclnp(void *arg) |
430 | void ktaskclnp(void *arg) |
431 | { |
431 | { |
432 | ipl_t ipl; |
432 | ipl_t ipl; |
433 | thread_t *t = NULL, *main_thread; |
433 | thread_t *t = NULL, *main_thread; |
434 | link_t *cur; |
434 | link_t *cur; |
435 | bool again; |
435 | bool again; |
436 | 436 | ||
437 | thread_detach(THREAD); |
437 | thread_detach(THREAD); |
438 | 438 | ||
439 | loop: |
439 | loop: |
440 | ipl = interrupts_disable(); |
440 | ipl = interrupts_disable(); |
441 | spinlock_lock(&TASK->lock); |
441 | spinlock_lock(&TASK->lock); |
442 | 442 | ||
443 | main_thread = TASK->main_thread; |
443 | main_thread = TASK->main_thread; |
444 | 444 | ||
445 | /* |
445 | /* |
446 | * Find a thread to join. |
446 | * Find a thread to join. |
447 | */ |
447 | */ |
448 | again = false; |
448 | again = false; |
449 | for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) { |
449 | for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) { |
450 | t = list_get_instance(cur, thread_t, th_link); |
450 | t = list_get_instance(cur, thread_t, th_link); |
451 | 451 | ||
452 | spinlock_lock(&t->lock); |
452 | spinlock_lock(&t->lock); |
453 | if (t == THREAD) { |
453 | if (t == THREAD) { |
454 | spinlock_unlock(&t->lock); |
454 | spinlock_unlock(&t->lock); |
455 | continue; |
455 | continue; |
456 | } else if (t == main_thread) { |
456 | } else if (t == main_thread) { |
457 | spinlock_unlock(&t->lock); |
457 | spinlock_unlock(&t->lock); |
458 | continue; |
458 | continue; |
459 | } else if (t->join_type != None) { |
459 | } else if (t->join_type != None) { |
460 | spinlock_unlock(&t->lock); |
460 | spinlock_unlock(&t->lock); |
461 | again = true; |
461 | again = true; |
462 | continue; |
462 | continue; |
463 | } else { |
463 | } else { |
464 | t->join_type = TaskClnp; |
464 | t->join_type = TaskClnp; |
465 | spinlock_unlock(&t->lock); |
465 | spinlock_unlock(&t->lock); |
466 | again = false; |
466 | again = false; |
467 | break; |
467 | break; |
468 | } |
468 | } |
469 | } |
469 | } |
470 | 470 | ||
471 | spinlock_unlock(&TASK->lock); |
471 | spinlock_unlock(&TASK->lock); |
472 | interrupts_restore(ipl); |
472 | interrupts_restore(ipl); |
473 | 473 | ||
474 | if (again) { |
474 | if (again) { |
475 | /* |
475 | /* |
476 | * Other cleanup (e.g. ktaskgc) is in progress. |
476 | * Other cleanup (e.g. ktaskgc) is in progress. |
477 | */ |
477 | */ |
478 | scheduler(); |
478 | scheduler(); |
479 | goto loop; |
479 | goto loop; |
480 | } |
480 | } |
481 | 481 | ||
482 | if (t != THREAD) { |
482 | if (t != THREAD) { |
483 | ASSERT(t != main_thread); /* uninit is joined and detached |
483 | ASSERT(t != main_thread); /* uninit is joined and detached |
484 | * in ktaskgc */ |
484 | * in ktaskgc */ |
485 | thread_join(t); |
485 | thread_join(t); |
486 | thread_detach(t); |
486 | thread_detach(t); |
487 | goto loop; /* go for another thread */ |
487 | goto loop; /* go for another thread */ |
488 | } |
488 | } |
489 | 489 | ||
490 | /* |
490 | /* |
491 | * Now there are no other threads in this task |
491 | * Now there are no other threads in this task |
492 | * and no new threads can be created. |
492 | * and no new threads can be created. |
493 | */ |
493 | */ |
494 | 494 | ||
495 | ipc_cleanup(); |
495 | ipc_cleanup(); |
496 | futex_cleanup(); |
496 | futex_cleanup(); |
497 | klog_printf("Cleanup of task %lld completed.", TASK->taskid); |
497 | klog_printf("Cleanup of task %lld completed.", TASK->taskid); |
498 | } |
498 | } |
499 | 499 | ||
500 | /** Kernel thread used to kill the userspace task when its main thread exits. |
500 | /** Kernel thread used to kill the userspace task when its main thread exits. |
501 | * |
501 | * |
502 | * This thread waits until the main userspace thread (i.e. uninit) exits. |
502 | * This thread waits until the main userspace thread (i.e. uninit) exits. |
503 | * When this happens, the task is killed. In the meantime, exited threads |
503 | * When this happens, the task is killed. In the meantime, exited threads |
504 | * are garbage collected. |
504 | * are garbage collected. |
505 | * |
505 | * |
506 | * @param arg Pointer to the thread structure of the task's main thread. |
506 | * @param arg Pointer to the thread structure of the task's main thread. |
507 | */ |
507 | */ |
508 | void ktaskgc(void *arg) |
508 | void ktaskgc(void *arg) |
509 | { |
509 | { |
510 | thread_t *t = (thread_t *) arg; |
510 | thread_t *t = (thread_t *) arg; |
511 | loop: |
511 | loop: |
512 | /* |
512 | /* |
513 | * Userspace threads cannot detach themselves, |
513 | * Userspace threads cannot detach themselves, |
514 | * therefore the thread pointer is guaranteed to be valid. |
514 | * therefore the thread pointer is guaranteed to be valid. |
515 | */ |
515 | */ |
516 | if (thread_join_timeout(t, 1000000, SYNCH_FLAGS_NONE) == |
516 | if (thread_join_timeout(t, 1000000, SYNCH_FLAGS_NONE) == |
517 | ESYNCH_TIMEOUT) { /* sleep uninterruptibly here! */ |
517 | ESYNCH_TIMEOUT) { /* sleep uninterruptibly here! */ |
518 | ipl_t ipl; |
518 | ipl_t ipl; |
519 | link_t *cur; |
519 | link_t *cur; |
520 | thread_t *thr = NULL; |
520 | thread_t *thr = NULL; |
521 | 521 | ||
522 | /* |
522 | /* |
523 | * The join timed out. Try to do some garbage collection of |
523 | * The join timed out. Try to do some garbage collection of |
524 | * Undead threads. |
524 | * Undead threads. |
525 | */ |
525 | */ |
526 | more_gc: |
526 | more_gc: |
527 | ipl = interrupts_disable(); |
527 | ipl = interrupts_disable(); |
528 | spinlock_lock(&TASK->lock); |
528 | spinlock_lock(&TASK->lock); |
529 | 529 | ||
530 | for (cur = TASK->th_head.next; cur != &TASK->th_head; |
530 | for (cur = TASK->th_head.next; cur != &TASK->th_head; |
531 | cur = cur->next) { |
531 | cur = cur->next) { |
532 | thr = list_get_instance(cur, thread_t, th_link); |
532 | thr = list_get_instance(cur, thread_t, th_link); |
533 | spinlock_lock(&thr->lock); |
533 | spinlock_lock(&thr->lock); |
534 | if (thr != t && thr->state == Undead && |
534 | if (thr != t && thr->state == Undead && |
535 | thr->join_type == None) { |
535 | thr->join_type == None) { |
536 | thr->join_type = TaskGC; |
536 | thr->join_type = TaskGC; |
537 | spinlock_unlock(&thr->lock); |
537 | spinlock_unlock(&thr->lock); |
538 | break; |
538 | break; |
539 | } |
539 | } |
540 | spinlock_unlock(&thr->lock); |
540 | spinlock_unlock(&thr->lock); |
541 | thr = NULL; |
541 | thr = NULL; |
542 | } |
542 | } |
543 | spinlock_unlock(&TASK->lock); |
543 | spinlock_unlock(&TASK->lock); |
544 | interrupts_restore(ipl); |
544 | interrupts_restore(ipl); |
545 | 545 | ||
546 | if (thr) { |
546 | if (thr) { |
547 | thread_join(thr); |
547 | thread_join(thr); |
548 | thread_detach(thr); |
548 | thread_detach(thr); |
549 | scheduler(); |
549 | scheduler(); |
550 | goto more_gc; |
550 | goto more_gc; |
551 | } |
551 | } |
552 | 552 | ||
553 | goto loop; |
553 | goto loop; |
554 | } |
554 | } |
555 | thread_detach(t); |
555 | thread_detach(t); |
556 | task_kill(TASK->taskid); |
556 | task_kill(TASK->taskid); |
557 | } |
557 | } |
558 | 558 | ||
559 | /** @} |
559 | /** @} |
560 | */ |
560 | */ |
561 | 561 |