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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 Thread management functions. |
35 | * @brief Thread management functions. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <proc/scheduler.h> |
38 | #include <proc/scheduler.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/frame.h> |
42 | #include <mm/frame.h> |
43 | #include <mm/page.h> |
43 | #include <mm/page.h> |
44 | #include <arch/asm.h> |
44 | #include <arch/asm.h> |
45 | #include <arch/cycle.h> |
45 | #include <arch/cycle.h> |
46 | #include <arch.h> |
46 | #include <arch.h> |
47 | #include <synch/synch.h> |
47 | #include <synch/synch.h> |
48 | #include <synch/spinlock.h> |
48 | #include <synch/spinlock.h> |
49 | #include <synch/waitq.h> |
49 | #include <synch/waitq.h> |
50 | #include <synch/rwlock.h> |
50 | #include <synch/rwlock.h> |
51 | #include <cpu.h> |
51 | #include <cpu.h> |
52 | #include <func.h> |
52 | #include <func.h> |
53 | #include <context.h> |
53 | #include <context.h> |
54 | #include <adt/avl.h> |
54 | #include <adt/avl.h> |
55 | #include <adt/list.h> |
55 | #include <adt/list.h> |
56 | #include <time/clock.h> |
56 | #include <time/clock.h> |
57 | #include <time/timeout.h> |
57 | #include <time/timeout.h> |
58 | #include <config.h> |
58 | #include <config.h> |
59 | #include <arch/interrupt.h> |
59 | #include <arch/interrupt.h> |
60 | #include <smp/ipi.h> |
60 | #include <smp/ipi.h> |
61 | #include <arch/faddr.h> |
61 | #include <arch/faddr.h> |
62 | #include <atomic.h> |
62 | #include <atomic.h> |
63 | #include <memstr.h> |
63 | #include <memstr.h> |
64 | #include <print.h> |
64 | #include <print.h> |
65 | #include <mm/slab.h> |
65 | #include <mm/slab.h> |
66 | #include <debug.h> |
66 | #include <debug.h> |
67 | #include <main/uinit.h> |
67 | #include <main/uinit.h> |
68 | #include <syscall/copy.h> |
68 | #include <syscall/copy.h> |
69 | #include <errno.h> |
69 | #include <errno.h> |
70 | 70 | ||
71 | 71 | ||
72 | #ifndef LOADED_PROG_STACK_PAGES_NO |
72 | #ifndef LOADED_PROG_STACK_PAGES_NO |
73 | #define LOADED_PROG_STACK_PAGES_NO 1 |
73 | #define LOADED_PROG_STACK_PAGES_NO 1 |
74 | #endif |
74 | #endif |
75 | 75 | ||
76 | 76 | ||
77 | /** Thread states */ |
77 | /** Thread states */ |
78 | char *thread_states[] = { |
78 | char *thread_states[] = { |
79 | "Invalid", |
79 | "Invalid", |
80 | "Running", |
80 | "Running", |
81 | "Sleeping", |
81 | "Sleeping", |
82 | "Ready", |
82 | "Ready", |
83 | "Entering", |
83 | "Entering", |
84 | "Exiting", |
84 | "Exiting", |
85 | "Lingering" |
85 | "Lingering" |
86 | }; |
86 | }; |
87 | 87 | ||
88 | /** Lock protecting the threads_tree AVL tree. |
88 | /** Lock protecting the threads_tree AVL tree. |
89 | * |
89 | * |
90 | * For locking rules, see declaration thereof. |
90 | * For locking rules, see declaration thereof. |
91 | */ |
91 | */ |
92 | SPINLOCK_INITIALIZE(threads_lock); |
92 | SPINLOCK_INITIALIZE(threads_lock); |
93 | 93 | ||
94 | /** AVL tree of all threads. |
94 | /** AVL tree of all threads. |
95 | * |
95 | * |
96 | * When a thread is found in the threads_tree AVL tree, it is guaranteed to |
96 | * When a thread is found in the threads_tree AVL tree, it is guaranteed to |
97 | * exist as long as the threads_lock is held. |
97 | * exist as long as the threads_lock is held. |
98 | */ |
98 | */ |
99 | avltree_t threads_tree; |
99 | avltree_t threads_tree; |
100 | 100 | ||
101 | SPINLOCK_INITIALIZE(tidlock); |
101 | SPINLOCK_INITIALIZE(tidlock); |
102 | thread_id_t last_tid = 0; |
102 | thread_id_t last_tid = 0; |
103 | 103 | ||
104 | static slab_cache_t *thread_slab; |
104 | static slab_cache_t *thread_slab; |
105 | #ifdef ARCH_HAS_FPU |
105 | #ifdef ARCH_HAS_FPU |
106 | slab_cache_t *fpu_context_slab; |
106 | slab_cache_t *fpu_context_slab; |
107 | #endif |
107 | #endif |
108 | 108 | ||
109 | /** Thread wrapper. |
109 | /** Thread wrapper. |
110 | * |
110 | * |
111 | * This wrapper is provided to ensure that every thread makes a call to |
111 | * This wrapper is provided to ensure that every thread makes a call to |
112 | * thread_exit() when its implementing function returns. |
112 | * thread_exit() when its implementing function returns. |
113 | * |
113 | * |
114 | * interrupts_disable() is assumed. |
114 | * interrupts_disable() is assumed. |
115 | * |
115 | * |
116 | */ |
116 | */ |
117 | static void cushion(void) |
117 | static void cushion(void) |
118 | { |
118 | { |
119 | void (*f)(void *) = THREAD->thread_code; |
119 | void (*f)(void *) = THREAD->thread_code; |
120 | void *arg = THREAD->thread_arg; |
120 | void *arg = THREAD->thread_arg; |
121 | THREAD->last_cycle = get_cycle(); |
121 | THREAD->last_cycle = get_cycle(); |
122 | 122 | ||
123 | /* This is where each thread wakes up after its creation */ |
123 | /* This is where each thread wakes up after its creation */ |
124 | spinlock_unlock(&THREAD->lock); |
124 | spinlock_unlock(&THREAD->lock); |
125 | interrupts_enable(); |
125 | interrupts_enable(); |
126 | 126 | ||
127 | f(arg); |
127 | f(arg); |
128 | 128 | ||
129 | /* Accumulate accounting to the task */ |
129 | /* Accumulate accounting to the task */ |
130 | ipl_t ipl = interrupts_disable(); |
130 | ipl_t ipl = interrupts_disable(); |
131 | 131 | ||
132 | spinlock_lock(&THREAD->lock); |
132 | spinlock_lock(&THREAD->lock); |
133 | if (!THREAD->uncounted) { |
133 | if (!THREAD->uncounted) { |
134 | thread_update_accounting(); |
134 | thread_update_accounting(); |
135 | uint64_t cycles = THREAD->cycles; |
135 | uint64_t cycles = THREAD->cycles; |
136 | THREAD->cycles = 0; |
136 | THREAD->cycles = 0; |
137 | spinlock_unlock(&THREAD->lock); |
137 | spinlock_unlock(&THREAD->lock); |
138 | 138 | ||
139 | spinlock_lock(&TASK->lock); |
139 | spinlock_lock(&TASK->lock); |
140 | TASK->cycles += cycles; |
140 | TASK->cycles += cycles; |
141 | spinlock_unlock(&TASK->lock); |
141 | spinlock_unlock(&TASK->lock); |
142 | } else |
142 | } else |
143 | spinlock_unlock(&THREAD->lock); |
143 | spinlock_unlock(&THREAD->lock); |
144 | 144 | ||
145 | interrupts_restore(ipl); |
145 | interrupts_restore(ipl); |
146 | 146 | ||
147 | thread_exit(); |
147 | thread_exit(); |
148 | /* not reached */ |
148 | /* not reached */ |
149 | } |
149 | } |
150 | 150 | ||
151 | /** Initialization and allocation for thread_t structure */ |
151 | /** Initialization and allocation for thread_t structure */ |
152 | static int thr_constructor(void *obj, int kmflags) |
152 | static int thr_constructor(void *obj, int kmflags) |
153 | { |
153 | { |
154 | thread_t *t = (thread_t *) obj; |
154 | thread_t *t = (thread_t *) obj; |
155 | 155 | ||
156 | spinlock_initialize(&t->lock, "thread_t_lock"); |
156 | spinlock_initialize(&t->lock, "thread_t_lock"); |
157 | link_initialize(&t->rq_link); |
157 | link_initialize(&t->rq_link); |
158 | link_initialize(&t->wq_link); |
158 | link_initialize(&t->wq_link); |
159 | link_initialize(&t->th_link); |
159 | link_initialize(&t->th_link); |
160 | 160 | ||
161 | /* call the architecture-specific part of the constructor */ |
161 | /* call the architecture-specific part of the constructor */ |
162 | thr_constructor_arch(t); |
162 | thr_constructor_arch(t); |
163 | 163 | ||
164 | #ifdef ARCH_HAS_FPU |
164 | #ifdef ARCH_HAS_FPU |
165 | #ifdef CONFIG_FPU_LAZY |
165 | #ifdef CONFIG_FPU_LAZY |
166 | t->saved_fpu_context = NULL; |
166 | t->saved_fpu_context = NULL; |
167 | #else |
167 | #else |
168 | t->saved_fpu_context = slab_alloc(fpu_context_slab, kmflags); |
168 | t->saved_fpu_context = slab_alloc(fpu_context_slab, kmflags); |
169 | if (!t->saved_fpu_context) |
169 | if (!t->saved_fpu_context) |
170 | return -1; |
170 | return -1; |
171 | #endif |
171 | #endif |
172 | #endif |
172 | #endif |
173 | 173 | ||
174 | t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags); |
174 | t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags); |
175 | if (!t->kstack) { |
175 | if (!t->kstack) { |
176 | #ifdef ARCH_HAS_FPU |
176 | #ifdef ARCH_HAS_FPU |
177 | if (t->saved_fpu_context) |
177 | if (t->saved_fpu_context) |
178 | slab_free(fpu_context_slab, t->saved_fpu_context); |
178 | slab_free(fpu_context_slab, t->saved_fpu_context); |
179 | #endif |
179 | #endif |
180 | return -1; |
180 | return -1; |
181 | } |
181 | } |
182 | 182 | ||
183 | #ifdef CONFIG_UDEBUG |
183 | #ifdef CONFIG_UDEBUG |
184 | mutex_initialize(&t->udebug.lock, MUTEX_PASSIVE); |
184 | mutex_initialize(&t->udebug.lock, MUTEX_PASSIVE); |
185 | #endif |
185 | #endif |
186 | 186 | ||
187 | return 0; |
187 | return 0; |
188 | } |
188 | } |
189 | 189 | ||
190 | /** Destruction of thread_t object */ |
190 | /** Destruction of thread_t object */ |
191 | static int thr_destructor(void *obj) |
191 | static int thr_destructor(void *obj) |
192 | { |
192 | { |
193 | thread_t *t = (thread_t *) obj; |
193 | thread_t *t = (thread_t *) obj; |
194 | 194 | ||
195 | /* call the architecture-specific part of the destructor */ |
195 | /* call the architecture-specific part of the destructor */ |
196 | thr_destructor_arch(t); |
196 | thr_destructor_arch(t); |
197 | 197 | ||
198 | frame_free(KA2PA(t->kstack)); |
198 | frame_free(KA2PA(t->kstack)); |
199 | #ifdef ARCH_HAS_FPU |
199 | #ifdef ARCH_HAS_FPU |
200 | if (t->saved_fpu_context) |
200 | if (t->saved_fpu_context) |
201 | slab_free(fpu_context_slab, t->saved_fpu_context); |
201 | slab_free(fpu_context_slab, t->saved_fpu_context); |
202 | #endif |
202 | #endif |
203 | return 1; /* One page freed */ |
203 | return 1; /* One page freed */ |
204 | } |
204 | } |
205 | 205 | ||
206 | /** Initialize threads |
206 | /** Initialize threads |
207 | * |
207 | * |
208 | * Initialize kernel threads support. |
208 | * Initialize kernel threads support. |
209 | * |
209 | * |
210 | */ |
210 | */ |
211 | void thread_init(void) |
211 | void thread_init(void) |
212 | { |
212 | { |
213 | THREAD = NULL; |
213 | THREAD = NULL; |
214 | atomic_set(&nrdy,0); |
214 | atomic_set(&nrdy,0); |
215 | thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0, |
215 | thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0, |
216 | thr_constructor, thr_destructor, 0); |
216 | thr_constructor, thr_destructor, 0); |
217 | 217 | ||
218 | #ifdef ARCH_HAS_FPU |
218 | #ifdef ARCH_HAS_FPU |
219 | fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t), |
219 | fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t), |
220 | FPU_CONTEXT_ALIGN, NULL, NULL, 0); |
220 | FPU_CONTEXT_ALIGN, NULL, NULL, 0); |
221 | #endif |
221 | #endif |
222 | 222 | ||
223 | avltree_create(&threads_tree); |
223 | avltree_create(&threads_tree); |
224 | } |
224 | } |
225 | 225 | ||
226 | /** Make thread ready |
226 | /** Make thread ready |
227 | * |
227 | * |
228 | * Switch thread t to the ready state. |
228 | * Switch thread t to the ready state. |
229 | * |
229 | * |
230 | * @param t Thread to make ready. |
230 | * @param t Thread to make ready. |
231 | * |
231 | * |
232 | */ |
232 | */ |
233 | void thread_ready(thread_t *t) |
233 | void thread_ready(thread_t *t) |
234 | { |
234 | { |
235 | cpu_t *cpu; |
235 | cpu_t *cpu; |
236 | runq_t *r; |
236 | runq_t *r; |
237 | ipl_t ipl; |
237 | ipl_t ipl; |
238 | int i, avg; |
238 | int i, avg; |
239 | 239 | ||
240 | ipl = interrupts_disable(); |
240 | ipl = interrupts_disable(); |
241 | 241 | ||
242 | spinlock_lock(&t->lock); |
242 | spinlock_lock(&t->lock); |
243 | 243 | ||
244 | ASSERT(!(t->state == Ready)); |
244 | ASSERT(!(t->state == Ready)); |
245 | 245 | ||
246 | i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority; |
246 | i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority; |
247 | 247 | ||
248 | cpu = CPU; |
248 | cpu = CPU; |
249 | if (t->flags & THREAD_FLAG_WIRED) { |
249 | if (t->flags & THREAD_FLAG_WIRED) { |
250 | ASSERT(t->cpu != NULL); |
250 | ASSERT(t->cpu != NULL); |
251 | cpu = t->cpu; |
251 | cpu = t->cpu; |
252 | } |
252 | } |
253 | t->state = Ready; |
253 | t->state = Ready; |
254 | spinlock_unlock(&t->lock); |
254 | spinlock_unlock(&t->lock); |
255 | 255 | ||
256 | /* |
256 | /* |
257 | * Append t to respective ready queue on respective processor. |
257 | * Append t to respective ready queue on respective processor. |
258 | */ |
258 | */ |
259 | r = &cpu->rq[i]; |
259 | r = &cpu->rq[i]; |
260 | spinlock_lock(&r->lock); |
260 | spinlock_lock(&r->lock); |
261 | list_append(&t->rq_link, &r->rq_head); |
261 | list_append(&t->rq_link, &r->rq_head); |
262 | r->n++; |
262 | r->n++; |
263 | spinlock_unlock(&r->lock); |
263 | spinlock_unlock(&r->lock); |
264 | 264 | ||
265 | atomic_inc(&nrdy); |
265 | atomic_inc(&nrdy); |
266 | avg = atomic_get(&nrdy) / config.cpu_active; |
266 | avg = atomic_get(&nrdy) / config.cpu_active; |
267 | atomic_inc(&cpu->nrdy); |
267 | atomic_inc(&cpu->nrdy); |
268 | 268 | ||
269 | interrupts_restore(ipl); |
269 | interrupts_restore(ipl); |
270 | } |
270 | } |
271 | 271 | ||
272 | /** Create new thread |
272 | /** Create new thread |
273 | * |
273 | * |
274 | * Create a new thread. |
274 | * Create a new thread. |
275 | * |
275 | * |
276 | * @param func Thread's implementing function. |
276 | * @param func Thread's implementing function. |
277 | * @param arg Thread's implementing function argument. |
277 | * @param arg Thread's implementing function argument. |
278 | * @param task Task to which the thread belongs. The caller must |
278 | * @param task Task to which the thread belongs. The caller must |
279 | * guarantee that the task won't cease to exist during the |
279 | * guarantee that the task won't cease to exist during the |
280 | * call. The task's lock may not be held. |
280 | * call. The task's lock may not be held. |
281 | * @param flags Thread flags. |
281 | * @param flags Thread flags. |
282 | * @param name Symbolic name. |
282 | * @param name Symbolic name. |
283 | * @param uncounted Thread's accounting doesn't affect accumulated task |
283 | * @param uncounted Thread's accounting doesn't affect accumulated task |
284 | * accounting. |
284 | * accounting. |
285 | * |
285 | * |
286 | * @return New thread's structure on success, NULL on failure. |
286 | * @return New thread's structure on success, NULL on failure. |
287 | * |
287 | * |
288 | */ |
288 | */ |
289 | thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, |
289 | thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, |
290 | int flags, char *name, bool uncounted) |
290 | int flags, char *name, bool uncounted) |
291 | { |
291 | { |
292 | thread_t *t; |
292 | thread_t *t; |
293 | ipl_t ipl; |
293 | ipl_t ipl; |
294 | 294 | ||
295 | t = (thread_t *) slab_alloc(thread_slab, 0); |
295 | t = (thread_t *) slab_alloc(thread_slab, 0); |
296 | if (!t) |
296 | if (!t) |
297 | return NULL; |
297 | return NULL; |
298 | 298 | ||
299 | /* Not needed, but good for debugging */ |
299 | /* Not needed, but good for debugging */ |
300 | memsetb(t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES, 0); |
300 | memsetb(t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES, 0); |
301 | 301 | ||
302 | ipl = interrupts_disable(); |
302 | ipl = interrupts_disable(); |
303 | spinlock_lock(&tidlock); |
303 | spinlock_lock(&tidlock); |
304 | t->tid = ++last_tid; |
304 | t->tid = ++last_tid; |
305 | spinlock_unlock(&tidlock); |
305 | spinlock_unlock(&tidlock); |
306 | interrupts_restore(ipl); |
306 | interrupts_restore(ipl); |
307 | 307 | ||
308 | context_save(&t->saved_context); |
308 | context_save(&t->saved_context); |
309 | context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack, |
309 | context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack, |
310 | THREAD_STACK_SIZE); |
310 | THREAD_STACK_SIZE); |
311 | 311 | ||
312 | the_initialize((the_t *) t->kstack); |
312 | the_initialize((the_t *) t->kstack); |
313 | 313 | ||
314 | ipl = interrupts_disable(); |
314 | ipl = interrupts_disable(); |
315 | t->saved_context.ipl = interrupts_read(); |
315 | t->saved_context.ipl = interrupts_read(); |
316 | interrupts_restore(ipl); |
316 | interrupts_restore(ipl); |
317 | 317 | ||
318 | memcpy(t->name, name, THREAD_NAME_BUFLEN); |
318 | memcpy(t->name, name, THREAD_NAME_BUFLEN); |
319 | 319 | ||
320 | t->thread_code = func; |
320 | t->thread_code = func; |
321 | t->thread_arg = arg; |
321 | t->thread_arg = arg; |
322 | t->ticks = -1; |
322 | t->ticks = -1; |
323 | t->cycles = 0; |
323 | t->cycles = 0; |
324 | t->uncounted = uncounted; |
324 | t->uncounted = uncounted; |
325 | t->priority = -1; /* start in rq[0] */ |
325 | t->priority = -1; /* start in rq[0] */ |
326 | t->cpu = NULL; |
326 | t->cpu = NULL; |
327 | t->flags = flags; |
327 | t->flags = flags; |
328 | t->state = Entering; |
328 | t->state = Entering; |
329 | t->call_me = NULL; |
329 | t->call_me = NULL; |
330 | t->call_me_with = NULL; |
330 | t->call_me_with = NULL; |
331 | 331 | ||
332 | timeout_initialize(&t->sleep_timeout); |
332 | timeout_initialize(&t->sleep_timeout); |
333 | t->sleep_interruptible = false; |
333 | t->sleep_interruptible = false; |
334 | t->sleep_queue = NULL; |
334 | t->sleep_queue = NULL; |
335 | t->timeout_pending = 0; |
335 | t->timeout_pending = 0; |
336 | 336 | ||
337 | t->in_copy_from_uspace = false; |
337 | t->in_copy_from_uspace = false; |
338 | t->in_copy_to_uspace = false; |
338 | t->in_copy_to_uspace = false; |
339 | 339 | ||
340 | t->interrupted = false; |
340 | t->interrupted = false; |
341 | t->detached = false; |
341 | t->detached = false; |
342 | waitq_initialize(&t->join_wq); |
342 | waitq_initialize(&t->join_wq); |
343 | 343 | ||
344 | t->rwlock_holder_type = RWLOCK_NONE; |
344 | t->rwlock_holder_type = RWLOCK_NONE; |
345 | 345 | ||
346 | t->task = task; |
346 | t->task = task; |
347 | 347 | ||
348 | t->fpu_context_exists = 0; |
348 | t->fpu_context_exists = 0; |
349 | t->fpu_context_engaged = 0; |
349 | t->fpu_context_engaged = 0; |
350 | 350 | ||
351 | avltree_node_initialize(&t->threads_tree_node); |
351 | avltree_node_initialize(&t->threads_tree_node); |
352 | t->threads_tree_node.key = (uintptr_t) t; |
352 | t->threads_tree_node.key = (uintptr_t) t; |
353 | 353 | ||
354 | #ifdef CONFIG_UDEBUG |
354 | #ifdef CONFIG_UDEBUG |
355 | /* Init debugging stuff */ |
355 | /* Init debugging stuff */ |
356 | udebug_thread_initialize(&t->udebug); |
356 | udebug_thread_initialize(&t->udebug); |
357 | #endif |
357 | #endif |
358 | 358 | ||
359 | /* might depend on previous initialization */ |
359 | /* might depend on previous initialization */ |
360 | thread_create_arch(t); |
360 | thread_create_arch(t); |
361 | 361 | ||
362 | if (!(flags & THREAD_FLAG_NOATTACH)) |
362 | if (!(flags & THREAD_FLAG_NOATTACH)) |
363 | thread_attach(t, task); |
363 | thread_attach(t, task); |
364 | 364 | ||
365 | return t; |
365 | return t; |
366 | } |
366 | } |
367 | 367 | ||
368 | /** Destroy thread memory structure |
368 | /** Destroy thread memory structure |
369 | * |
369 | * |
370 | * Detach thread from all queues, cpus etc. and destroy it. |
370 | * Detach thread from all queues, cpus etc. and destroy it. |
371 | * |
371 | * |
372 | * Assume thread->lock is held!! |
372 | * Assume thread->lock is held!! |
373 | */ |
373 | */ |
374 | void thread_destroy(thread_t *t) |
374 | void thread_destroy(thread_t *t) |
375 | { |
375 | { |
376 | ASSERT(t->state == Exiting || t->state == Lingering); |
376 | ASSERT(t->state == Exiting || t->state == Lingering); |
377 | ASSERT(t->task); |
377 | ASSERT(t->task); |
378 | ASSERT(t->cpu); |
378 | ASSERT(t->cpu); |
379 | 379 | ||
380 | spinlock_lock(&t->cpu->lock); |
380 | spinlock_lock(&t->cpu->lock); |
381 | if (t->cpu->fpu_owner == t) |
381 | if (t->cpu->fpu_owner == t) |
382 | t->cpu->fpu_owner = NULL; |
382 | t->cpu->fpu_owner = NULL; |
383 | spinlock_unlock(&t->cpu->lock); |
383 | spinlock_unlock(&t->cpu->lock); |
384 | 384 | ||
385 | spinlock_unlock(&t->lock); |
385 | spinlock_unlock(&t->lock); |
386 | 386 | ||
387 | spinlock_lock(&threads_lock); |
387 | spinlock_lock(&threads_lock); |
388 | avltree_delete(&threads_tree, &t->threads_tree_node); |
388 | avltree_delete(&threads_tree, &t->threads_tree_node); |
389 | spinlock_unlock(&threads_lock); |
389 | spinlock_unlock(&threads_lock); |
390 | 390 | ||
391 | /* |
391 | /* |
392 | * Detach from the containing task. |
392 | * Detach from the containing task. |
393 | */ |
393 | */ |
394 | spinlock_lock(&t->task->lock); |
394 | spinlock_lock(&t->task->lock); |
395 | list_remove(&t->th_link); |
395 | list_remove(&t->th_link); |
396 | spinlock_unlock(&t->task->lock); |
396 | spinlock_unlock(&t->task->lock); |
397 | 397 | ||
398 | /* |
398 | /* |
399 | * t is guaranteed to be the very last thread of its task. |
399 | * t is guaranteed to be the very last thread of its task. |
400 | * It is safe to destroy the task. |
400 | * It is safe to destroy the task. |
401 | */ |
401 | */ |
402 | if (atomic_predec(&t->task->refcount) == 0) |
402 | if (atomic_predec(&t->task->refcount) == 0) |
403 | task_destroy(t->task); |
403 | task_destroy(t->task); |
404 | 404 | ||
405 | slab_free(thread_slab, t); |
405 | slab_free(thread_slab, t); |
406 | } |
406 | } |
407 | 407 | ||
408 | /** Make the thread visible to the system. |
408 | /** Make the thread visible to the system. |
409 | * |
409 | * |
410 | * Attach the thread structure to the current task and make it visible in the |
410 | * Attach the thread structure to the current task and make it visible in the |
411 | * threads_tree. |
411 | * threads_tree. |
412 | * |
412 | * |
413 | * @param t Thread to be attached to the task. |
413 | * @param t Thread to be attached to the task. |
414 | * @param task Task to which the thread is to be attached. |
414 | * @param task Task to which the thread is to be attached. |
415 | */ |
415 | */ |
416 | void thread_attach(thread_t *t, task_t *task) |
416 | void thread_attach(thread_t *t, task_t *task) |
417 | { |
417 | { |
418 | ipl_t ipl; |
418 | ipl_t ipl; |
419 | 419 | ||
420 | /* |
420 | /* |
421 | * Attach to the specified task. |
421 | * Attach to the specified task. |
422 | */ |
422 | */ |
423 | ipl = interrupts_disable(); |
423 | ipl = interrupts_disable(); |
424 | spinlock_lock(&task->lock); |
424 | spinlock_lock(&task->lock); |
425 | 425 | ||
426 | atomic_inc(&task->refcount); |
426 | atomic_inc(&task->refcount); |
427 | 427 | ||
428 | /* Must not count kbox thread into lifecount */ |
428 | /* Must not count kbox thread into lifecount */ |
429 | if (t->flags & THREAD_FLAG_USPACE) |
429 | if (t->flags & THREAD_FLAG_USPACE) |
430 | atomic_inc(&task->lifecount); |
430 | atomic_inc(&task->lifecount); |
431 | 431 | ||
432 | list_append(&t->th_link, &task->th_head); |
432 | list_append(&t->th_link, &task->th_head); |
433 | spinlock_unlock(&task->lock); |
433 | spinlock_unlock(&task->lock); |
434 | 434 | ||
435 | /* |
435 | /* |
436 | * Register this thread in the system-wide list. |
436 | * Register this thread in the system-wide list. |
437 | */ |
437 | */ |
438 | spinlock_lock(&threads_lock); |
438 | spinlock_lock(&threads_lock); |
439 | avltree_insert(&threads_tree, &t->threads_tree_node); |
439 | avltree_insert(&threads_tree, &t->threads_tree_node); |
440 | spinlock_unlock(&threads_lock); |
440 | spinlock_unlock(&threads_lock); |
441 | 441 | ||
442 | interrupts_restore(ipl); |
442 | interrupts_restore(ipl); |
443 | } |
443 | } |
444 | 444 | ||
445 | /** Terminate thread. |
445 | /** Terminate thread. |
446 | * |
446 | * |
447 | * End current thread execution and switch it to the exiting state. All pending |
447 | * End current thread execution and switch it to the exiting state. All pending |
448 | * timeouts are executed. |
448 | * timeouts are executed. |
449 | */ |
449 | */ |
450 | void thread_exit(void) |
450 | void thread_exit(void) |
451 | { |
451 | { |
452 | ipl_t ipl; |
452 | ipl_t ipl; |
453 | 453 | ||
454 | if (THREAD->flags & THREAD_FLAG_USPACE) { |
454 | if (THREAD->flags & THREAD_FLAG_USPACE) { |
455 | #ifdef CONFIG_UDEBUG |
455 | #ifdef CONFIG_UDEBUG |
456 | /* Generate udebug THREAD_E event */ |
456 | /* Generate udebug THREAD_E event */ |
457 | udebug_thread_e_event(); |
457 | udebug_thread_e_event(); |
458 | #endif |
458 | #endif |
459 | if (atomic_predec(&TASK->lifecount) == 0) { |
459 | if (atomic_predec(&TASK->lifecount) == 0) { |
460 | /* |
460 | /* |
461 | * We are the last userspace thread in the task that |
461 | * We are the last userspace thread in the task that |
462 | * still has not exited. With the exception of the |
462 | * still has not exited. With the exception of the |
463 | * moment the task was created, new userspace threads |
463 | * moment the task was created, new userspace threads |
464 | * can only be created by threads of the same task. |
464 | * can only be created by threads of the same task. |
465 | * We are safe to perform cleanup. |
465 | * We are safe to perform cleanup. |
466 | */ |
466 | */ |
467 | ipc_cleanup(); |
467 | ipc_cleanup(); |
468 | futex_cleanup(); |
468 | futex_cleanup(); |
469 | LOG("Cleanup of task %" PRIu64" completed.", TASK->taskid); |
469 | LOG("Cleanup of task %" PRIu64" completed.", TASK->taskid); |
470 | } |
470 | } |
471 | } |
471 | } |
472 | 472 | ||
473 | restart: |
473 | restart: |
474 | ipl = interrupts_disable(); |
474 | ipl = interrupts_disable(); |
475 | spinlock_lock(&THREAD->lock); |
475 | spinlock_lock(&THREAD->lock); |
476 | if (THREAD->timeout_pending) { |
476 | if (THREAD->timeout_pending) { |
477 | /* busy waiting for timeouts in progress */ |
477 | /* busy waiting for timeouts in progress */ |
478 | spinlock_unlock(&THREAD->lock); |
478 | spinlock_unlock(&THREAD->lock); |
479 | interrupts_restore(ipl); |
479 | interrupts_restore(ipl); |
480 | goto restart; |
480 | goto restart; |
481 | } |
481 | } |
482 | 482 | ||
483 | THREAD->state = Exiting; |
483 | THREAD->state = Exiting; |
484 | spinlock_unlock(&THREAD->lock); |
484 | spinlock_unlock(&THREAD->lock); |
485 | scheduler(); |
485 | scheduler(); |
486 | 486 | ||
487 | /* Not reached */ |
487 | /* Not reached */ |
488 | while (1) |
488 | while (1) |
489 | ; |
489 | ; |
490 | } |
490 | } |
491 | 491 | ||
492 | 492 | ||
493 | /** Thread sleep |
493 | /** Thread sleep |
494 | * |
494 | * |
495 | * Suspend execution of the current thread. |
495 | * Suspend execution of the current thread. |
496 | * |
496 | * |
497 | * @param sec Number of seconds to sleep. |
497 | * @param sec Number of seconds to sleep. |
498 | * |
498 | * |
499 | */ |
499 | */ |
500 | void thread_sleep(uint32_t sec) |
500 | void thread_sleep(uint32_t sec) |
501 | { |
501 | { |
502 | thread_usleep(sec * 1000000); |
502 | thread_usleep(sec * 1000000); |
503 | } |
503 | } |
504 | 504 | ||
505 | /** Wait for another thread to exit. |
505 | /** Wait for another thread to exit. |
506 | * |
506 | * |
507 | * @param t Thread to join on exit. |
507 | * @param t Thread to join on exit. |
508 | * @param usec Timeout in microseconds. |
508 | * @param usec Timeout in microseconds. |
509 | * @param flags Mode of operation. |
509 | * @param flags Mode of operation. |
510 | * |
510 | * |
511 | * @return An error code from errno.h or an error code from synch.h. |
511 | * @return An error code from errno.h or an error code from synch.h. |
512 | */ |
512 | */ |
513 | int thread_join_timeout(thread_t *t, uint32_t usec, int flags) |
513 | int thread_join_timeout(thread_t *t, uint32_t usec, int flags) |
514 | { |
514 | { |
515 | ipl_t ipl; |
515 | ipl_t ipl; |
516 | int rc; |
516 | int rc; |
517 | 517 | ||
518 | if (t == THREAD) |
518 | if (t == THREAD) |
519 | return EINVAL; |
519 | return EINVAL; |
520 | 520 | ||
521 | /* |
521 | /* |
522 | * Since thread join can only be called once on an undetached thread, |
522 | * Since thread join can only be called once on an undetached thread, |
523 | * the thread pointer is guaranteed to be still valid. |
523 | * the thread pointer is guaranteed to be still valid. |
524 | */ |
524 | */ |
525 | 525 | ||
526 | ipl = interrupts_disable(); |
526 | ipl = interrupts_disable(); |
527 | spinlock_lock(&t->lock); |
527 | spinlock_lock(&t->lock); |
528 | ASSERT(!t->detached); |
528 | ASSERT(!t->detached); |
529 | spinlock_unlock(&t->lock); |
529 | spinlock_unlock(&t->lock); |
530 | interrupts_restore(ipl); |
530 | interrupts_restore(ipl); |
531 | 531 | ||
532 | rc = waitq_sleep_timeout(&t->join_wq, usec, flags); |
532 | rc = waitq_sleep_timeout(&t->join_wq, usec, flags); |
533 | 533 | ||
534 | return rc; |
534 | return rc; |
535 | } |
535 | } |
536 | 536 | ||
537 | /** Detach thread. |
537 | /** Detach thread. |
538 | * |
538 | * |
539 | * Mark the thread as detached, if the thread is already in the Lingering |
539 | * Mark the thread as detached, if the thread is already in the Lingering |
540 | * state, deallocate its resources. |
540 | * state, deallocate its resources. |
541 | * |
541 | * |
542 | * @param t Thread to be detached. |
542 | * @param t Thread to be detached. |
543 | */ |
543 | */ |
544 | void thread_detach(thread_t *t) |
544 | void thread_detach(thread_t *t) |
545 | { |
545 | { |
546 | ipl_t ipl; |
546 | ipl_t ipl; |
547 | 547 | ||
548 | /* |
548 | /* |
549 | * Since the thread is expected not to be already detached, |
549 | * Since the thread is expected not to be already detached, |
550 | * pointer to it must be still valid. |
550 | * pointer to it must be still valid. |
551 | */ |
551 | */ |
552 | ipl = interrupts_disable(); |
552 | ipl = interrupts_disable(); |
553 | spinlock_lock(&t->lock); |
553 | spinlock_lock(&t->lock); |
554 | ASSERT(!t->detached); |
554 | ASSERT(!t->detached); |
555 | if (t->state == Lingering) { |
555 | if (t->state == Lingering) { |
556 | thread_destroy(t); /* unlocks &t->lock */ |
556 | thread_destroy(t); /* unlocks &t->lock */ |
557 | interrupts_restore(ipl); |
557 | interrupts_restore(ipl); |
558 | return; |
558 | return; |
559 | } else { |
559 | } else { |
560 | t->detached = true; |
560 | t->detached = true; |
561 | } |
561 | } |
562 | spinlock_unlock(&t->lock); |
562 | spinlock_unlock(&t->lock); |
563 | interrupts_restore(ipl); |
563 | interrupts_restore(ipl); |
564 | } |
564 | } |
565 | 565 | ||
566 | /** Thread usleep |
566 | /** Thread usleep |
567 | * |
567 | * |
568 | * Suspend execution of the current thread. |
568 | * Suspend execution of the current thread. |
569 | * |
569 | * |
570 | * @param usec Number of microseconds to sleep. |
570 | * @param usec Number of microseconds to sleep. |
571 | * |
571 | * |
572 | */ |
572 | */ |
573 | void thread_usleep(uint32_t usec) |
573 | void thread_usleep(uint32_t usec) |
574 | { |
574 | { |
575 | waitq_t wq; |
575 | waitq_t wq; |
576 | 576 | ||
577 | waitq_initialize(&wq); |
577 | waitq_initialize(&wq); |
578 | 578 | ||
579 | (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING); |
579 | (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING); |
580 | } |
580 | } |
581 | 581 | ||
582 | /** Register thread out-of-context invocation |
582 | /** Register thread out-of-context invocation |
583 | * |
583 | * |
584 | * Register a function and its argument to be executed |
584 | * Register a function and its argument to be executed |
585 | * on next context switch to the current thread. |
585 | * on next context switch to the current thread. |
586 | * |
586 | * |
587 | * @param call_me Out-of-context function. |
587 | * @param call_me Out-of-context function. |
588 | * @param call_me_with Out-of-context function argument. |
588 | * @param call_me_with Out-of-context function argument. |
589 | * |
589 | * |
590 | */ |
590 | */ |
591 | void thread_register_call_me(void (* call_me)(void *), void *call_me_with) |
591 | void thread_register_call_me(void (* call_me)(void *), void *call_me_with) |
592 | { |
592 | { |
593 | ipl_t ipl; |
593 | ipl_t ipl; |
594 | 594 | ||
595 | ipl = interrupts_disable(); |
595 | ipl = interrupts_disable(); |
596 | spinlock_lock(&THREAD->lock); |
596 | spinlock_lock(&THREAD->lock); |
597 | THREAD->call_me = call_me; |
597 | THREAD->call_me = call_me; |
598 | THREAD->call_me_with = call_me_with; |
598 | THREAD->call_me_with = call_me_with; |
599 | spinlock_unlock(&THREAD->lock); |
599 | spinlock_unlock(&THREAD->lock); |
600 | interrupts_restore(ipl); |
600 | interrupts_restore(ipl); |
601 | } |
601 | } |
602 | 602 | ||
603 | static bool thread_walker(avltree_node_t *node, void *arg) |
603 | static bool thread_walker(avltree_node_t *node, void *arg) |
604 | { |
604 | { |
605 | thread_t *t = avltree_get_instance(node, thread_t, threads_tree_node); |
605 | thread_t *t = avltree_get_instance(node, thread_t, threads_tree_node); |
606 | 606 | ||
607 | uint64_t cycles; |
607 | uint64_t cycles; |
608 | char suffix; |
608 | char suffix; |
609 | order(t->cycles, &cycles, &suffix); |
609 | order(t->cycles, &cycles, &suffix); |
610 | 610 | ||
611 | #ifdef __32_BITS__ |
611 | #ifdef __32_BITS__ |
612 | printf("%-6" PRIu64" %-10s %10p %-8s %10p %-3" PRIu32 " %10p %10p %9" PRIu64 "%c ", |
612 | printf("%-6" PRIu64" %-10s %10p %-8s %10p %-3" PRIu32 " %10p %10p %9" PRIu64 "%c ", |
613 | t->tid, t->name, t, thread_states[t->state], t->task, |
613 | t->tid, t->name, t, thread_states[t->state], t->task, |
614 | t->task->context, t->thread_code, t->kstack, cycles, suffix); |
614 | t->task->context, t->thread_code, t->kstack, cycles, suffix); |
615 | #endif |
615 | #endif |
616 | 616 | ||
617 | #ifdef __64_BITS__ |
617 | #ifdef __64_BITS__ |
618 | printf("%-6" PRIu64" %-10s %18p %-8s %18p %-3" PRIu32 " %18p %18p %9" PRIu64 "%c ", |
618 | printf("%-6" PRIu64" %-10s %18p %-8s %18p %-3" PRIu32 " %18p %18p %9" PRIu64 "%c ", |
619 | t->tid, t->name, t, thread_states[t->state], t->task, |
619 | t->tid, t->name, t, thread_states[t->state], t->task, |
620 | t->task->context, t->thread_code, t->kstack, cycles, suffix); |
620 | t->task->context, t->thread_code, t->kstack, cycles, suffix); |
621 | #endif |
621 | #endif |
622 | 622 | ||
623 | if (t->cpu) |
623 | if (t->cpu) |
624 | printf("%-4u", t->cpu->id); |
624 | printf("%-4u", t->cpu->id); |
625 | else |
625 | else |
626 | printf("none"); |
626 | printf("none"); |
627 | 627 | ||
628 | if (t->state == Sleeping) { |
628 | if (t->state == Sleeping) { |
629 | #ifdef __32_BITS__ |
629 | #ifdef __32_BITS__ |
630 | printf(" %10p", t->sleep_queue); |
630 | printf(" %10p", t->sleep_queue); |
631 | #endif |
631 | #endif |
632 | 632 | ||
633 | #ifdef __64_BITS__ |
633 | #ifdef __64_BITS__ |
634 | printf(" %18p", t->sleep_queue); |
634 | printf(" %18p", t->sleep_queue); |
635 | #endif |
635 | #endif |
636 | } |
636 | } |
637 | 637 | ||
638 | printf("\n"); |
638 | printf("\n"); |
639 | 639 | ||
640 | return true; |
640 | return true; |
641 | } |
641 | } |
642 | 642 | ||
643 | /** Print list of threads debug info */ |
643 | /** Print list of threads debug info */ |
644 | void thread_print_list(void) |
644 | void thread_print_list(void) |
645 | { |
645 | { |
646 | ipl_t ipl; |
646 | ipl_t ipl; |
647 | 647 | ||
648 | /* Messing with thread structures, avoid deadlock */ |
648 | /* Messing with thread structures, avoid deadlock */ |
649 | ipl = interrupts_disable(); |
649 | ipl = interrupts_disable(); |
650 | spinlock_lock(&threads_lock); |
650 | spinlock_lock(&threads_lock); |
651 | 651 | ||
652 | #ifdef __32_BITS__ |
652 | #ifdef __32_BITS__ |
653 | printf("tid name address state task " |
653 | printf("tid name address state task " |
654 | "ctx code stack cycles cpu " |
654 | "ctx code stack cycles cpu " |
655 | "waitqueue\n"); |
655 | "waitqueue\n"); |
656 | printf("------ ---------- ---------- -------- ---------- " |
656 | printf("------ ---------- ---------- -------- ---------- " |
657 | "--- ---------- ---------- ---------- ---- " |
657 | "--- ---------- ---------- ---------- ---- " |
658 | "----------\n"); |
658 | "----------\n"); |
659 | #endif |
659 | #endif |
660 | 660 | ||
661 | #ifdef __64_BITS__ |
661 | #ifdef __64_BITS__ |
662 | printf("tid name address state task " |
662 | printf("tid name address state task " |
663 | "ctx code stack cycles cpu " |
663 | "ctx code stack cycles cpu " |
664 | "waitqueue\n"); |
664 | "waitqueue\n"); |
665 | printf("------ ---------- ------------------ -------- ------------------ " |
665 | printf("------ ---------- ------------------ -------- ------------------ " |
666 | "--- ------------------ ------------------ ---------- ---- " |
666 | "--- ------------------ ------------------ ---------- ---- " |
667 | "------------------\n"); |
667 | "------------------\n"); |
668 | #endif |
668 | #endif |
669 | 669 | ||
670 | avltree_walk(&threads_tree, thread_walker, NULL); |
670 | avltree_walk(&threads_tree, thread_walker, NULL); |
671 | 671 | ||
672 | spinlock_unlock(&threads_lock); |
672 | spinlock_unlock(&threads_lock); |
673 | interrupts_restore(ipl); |
673 | interrupts_restore(ipl); |
674 | } |
674 | } |
675 | 675 | ||
676 | /** Check whether thread exists. |
676 | /** Check whether thread exists. |
677 | * |
677 | * |
678 | * Note that threads_lock must be already held and |
678 | * Note that threads_lock must be already held and |
679 | * interrupts must be already disabled. |
679 | * interrupts must be already disabled. |
680 | * |
680 | * |
681 | * @param t Pointer to thread. |
681 | * @param t Pointer to thread. |
682 | * |
682 | * |
683 | * @return True if thread t is known to the system, false otherwise. |
683 | * @return True if thread t is known to the system, false otherwise. |
684 | */ |
684 | */ |
685 | bool thread_exists(thread_t *t) |
685 | bool thread_exists(thread_t *t) |
686 | { |
686 | { |
687 | avltree_node_t *node; |
687 | avltree_node_t *node; |
688 | 688 | ||
689 | node = avltree_search(&threads_tree, (avltree_key_t) ((uintptr_t) t)); |
689 | node = avltree_search(&threads_tree, (avltree_key_t) ((uintptr_t) t)); |
690 | 690 | ||
691 | return node != NULL; |
691 | return node != NULL; |
692 | } |
692 | } |
693 | 693 | ||
694 | /** Update accounting of current thread. |
694 | /** Update accounting of current thread. |
695 | * |
695 | * |
696 | * Note that thread_lock on THREAD must be already held and |
696 | * Note that thread_lock on THREAD must be already held and |
697 | * interrupts must be already disabled. |
697 | * interrupts must be already disabled. |
698 | * |
698 | * |
699 | */ |
699 | */ |
700 | void thread_update_accounting(void) |
700 | void thread_update_accounting(void) |
701 | { |
701 | { |
702 | uint64_t time = get_cycle(); |
702 | uint64_t time = get_cycle(); |
703 | THREAD->cycles += time - THREAD->last_cycle; |
703 | THREAD->cycles += time - THREAD->last_cycle; |
704 | THREAD->last_cycle = time; |
704 | THREAD->last_cycle = time; |
705 | } |
705 | } |
706 | 706 | ||
707 | /** Process syscall to create new thread. |
707 | /** Process syscall to create new thread. |
708 | * |
708 | * |
709 | */ |
709 | */ |
710 | unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name, |
710 | unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name, |
711 | thread_id_t *uspace_thread_id) |
711 | size_t name_len, thread_id_t *uspace_thread_id) |
712 | { |
712 | { |
713 | thread_t *t; |
713 | thread_t *t; |
714 | char namebuf[THREAD_NAME_BUFLEN]; |
714 | char namebuf[THREAD_NAME_BUFLEN]; |
715 | uspace_arg_t *kernel_uarg; |
715 | uspace_arg_t *kernel_uarg; |
716 | int rc; |
716 | int rc; |
717 | 717 | ||
- | 718 | if (name_len >= THREAD_NAME_BUFLEN) |
|
- | 719 | name_len = THREAD_NAME_BUFLEN - 1; |
|
- | 720 | ||
718 | rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN); |
721 | rc = copy_from_uspace(namebuf, uspace_name, name_len); |
719 | if (rc != 0) |
722 | if (rc != 0) |
720 | return (unative_t) rc; |
723 | return (unative_t) rc; |
721 | 724 | ||
- | 725 | namebuf[name_len] = '\0'; |
|
- | 726 | ||
722 | /* |
727 | /* |
723 | * In case of failure, kernel_uarg will be deallocated in this function. |
728 | * In case of failure, kernel_uarg will be deallocated in this function. |
724 | * In case of success, kernel_uarg will be freed in uinit(). |
729 | * In case of success, kernel_uarg will be freed in uinit(). |
725 | */ |
730 | */ |
726 | kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0); |
731 | kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0); |
727 | 732 | ||
728 | rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t)); |
733 | rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t)); |
729 | if (rc != 0) { |
734 | if (rc != 0) { |
730 | free(kernel_uarg); |
735 | free(kernel_uarg); |
731 | return (unative_t) rc; |
736 | return (unative_t) rc; |
732 | } |
737 | } |
733 | 738 | ||
734 | t = thread_create(uinit, kernel_uarg, TASK, |
739 | t = thread_create(uinit, kernel_uarg, TASK, |
735 | THREAD_FLAG_USPACE | THREAD_FLAG_NOATTACH, namebuf, false); |
740 | THREAD_FLAG_USPACE | THREAD_FLAG_NOATTACH, namebuf, false); |
736 | if (t) { |
741 | if (t) { |
737 | if (uspace_thread_id != NULL) { |
742 | if (uspace_thread_id != NULL) { |
738 | int rc; |
743 | int rc; |
739 | 744 | ||
740 | rc = copy_to_uspace(uspace_thread_id, &t->tid, |
745 | rc = copy_to_uspace(uspace_thread_id, &t->tid, |
741 | sizeof(t->tid)); |
746 | sizeof(t->tid)); |
742 | if (rc != 0) { |
747 | if (rc != 0) { |
743 | /* |
748 | /* |
744 | * We have encountered a failure, but the thread |
749 | * We have encountered a failure, but the thread |
745 | * has already been created. We need to undo its |
750 | * has already been created. We need to undo its |
746 | * creation now. |
751 | * creation now. |
747 | */ |
752 | */ |
748 | 753 | ||
749 | /* |
754 | /* |
750 | * The new thread structure is initialized, but |
755 | * The new thread structure is initialized, but |
751 | * is still not visible to the system. |
756 | * is still not visible to the system. |
752 | * We can safely deallocate it. |
757 | * We can safely deallocate it. |
753 | */ |
758 | */ |
754 | slab_free(thread_slab, t); |
759 | slab_free(thread_slab, t); |
755 | free(kernel_uarg); |
760 | free(kernel_uarg); |
756 | 761 | ||
757 | return (unative_t) rc; |
762 | return (unative_t) rc; |
758 | } |
763 | } |
759 | } |
764 | } |
760 | thread_attach(t, TASK); |
765 | thread_attach(t, TASK); |
761 | thread_ready(t); |
766 | thread_ready(t); |
762 | 767 | ||
763 | #ifdef CONFIG_UDEBUG |
768 | #ifdef CONFIG_UDEBUG |
764 | /* Generate udebug THREAD_B event */ |
769 | /* Generate udebug THREAD_B event */ |
765 | udebug_thread_b_event(t); |
770 | udebug_thread_b_event(t); |
766 | #endif |
771 | #endif |
767 | 772 | ||
768 | return 0; |
773 | return 0; |
769 | } else |
774 | } else |
770 | free(kernel_uarg); |
775 | free(kernel_uarg); |
771 | 776 | ||
772 | return (unative_t) ENOMEM; |
777 | return (unative_t) ENOMEM; |
773 | } |
778 | } |
774 | 779 | ||
775 | /** Process syscall to terminate thread. |
780 | /** Process syscall to terminate thread. |
776 | * |
781 | * |
777 | */ |
782 | */ |
778 | unative_t sys_thread_exit(int uspace_status) |
783 | unative_t sys_thread_exit(int uspace_status) |
779 | { |
784 | { |
780 | thread_exit(); |
785 | thread_exit(); |
781 | /* Unreachable */ |
786 | /* Unreachable */ |
782 | return 0; |
787 | return 0; |
783 | } |
788 | } |
784 | 789 | ||
785 | /** Syscall for getting TID. |
790 | /** Syscall for getting TID. |
786 | * |
791 | * |
787 | * @param uspace_thread_id Userspace address of 8-byte buffer where to store |
792 | * @param uspace_thread_id Userspace address of 8-byte buffer where to store |
788 | * current thread ID. |
793 | * current thread ID. |
789 | * |
794 | * |
790 | * @return 0 on success or an error code from @ref errno.h. |
795 | * @return 0 on success or an error code from @ref errno.h. |
791 | */ |
796 | */ |
792 | unative_t sys_thread_get_id(thread_id_t *uspace_thread_id) |
797 | unative_t sys_thread_get_id(thread_id_t *uspace_thread_id) |
793 | { |
798 | { |
794 | /* |
799 | /* |
795 | * No need to acquire lock on THREAD because tid |
800 | * No need to acquire lock on THREAD because tid |
796 | * remains constant for the lifespan of the thread. |
801 | * remains constant for the lifespan of the thread. |
797 | */ |
802 | */ |
798 | return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid, |
803 | return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid, |
799 | sizeof(THREAD->tid)); |
804 | sizeof(THREAD->tid)); |
800 | } |
805 | } |
801 | 806 | ||
802 | /** @} |
807 | /** @} |
803 | */ |
808 | */ |
804 | 809 |