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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/btree.h> |
54 | #include <adt/btree.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 | /** Thread states */ |
72 | /** Thread states */ |
73 | char *thread_states[] = { |
73 | char *thread_states[] = { |
74 | "Invalid", |
74 | "Invalid", |
75 | "Running", |
75 | "Running", |
76 | "Sleeping", |
76 | "Sleeping", |
77 | "Ready", |
77 | "Ready", |
78 | "Entering", |
78 | "Entering", |
79 | "Exiting", |
79 | "Exiting", |
80 | "Undead" |
80 | "Undead" |
81 | }; |
81 | }; |
82 | 82 | ||
83 | /** Lock protecting the threads_btree B+tree. |
83 | /** Lock protecting the threads_btree B+tree. |
84 | * |
84 | * |
85 | * For locking rules, see declaration thereof. |
85 | * For locking rules, see declaration thereof. |
86 | */ |
86 | */ |
87 | SPINLOCK_INITIALIZE(threads_lock); |
87 | SPINLOCK_INITIALIZE(threads_lock); |
88 | 88 | ||
89 | /** B+tree of all threads. |
89 | /** B+tree of all threads. |
90 | * |
90 | * |
91 | * When a thread is found in the threads_btree B+tree, it is guaranteed to |
91 | * When a thread is found in the threads_btree B+tree, it is guaranteed to |
92 | * exist as long as the threads_lock is held. |
92 | * exist as long as the threads_lock is held. |
93 | */ |
93 | */ |
94 | btree_t threads_btree; |
94 | btree_t threads_btree; |
95 | 95 | ||
96 | SPINLOCK_INITIALIZE(tidlock); |
96 | SPINLOCK_INITIALIZE(tidlock); |
97 | thread_id_t last_tid = 0; |
97 | thread_id_t last_tid = 0; |
98 | 98 | ||
99 | static slab_cache_t *thread_slab; |
99 | static slab_cache_t *thread_slab; |
100 | #ifdef ARCH_HAS_FPU |
100 | #ifdef ARCH_HAS_FPU |
101 | slab_cache_t *fpu_context_slab; |
101 | slab_cache_t *fpu_context_slab; |
102 | #endif |
102 | #endif |
103 | 103 | ||
104 | /** Thread wrapper. |
104 | /** Thread wrapper. |
105 | * |
105 | * |
106 | * This wrapper is provided to ensure that every thread makes a call to |
106 | * This wrapper is provided to ensure that every thread makes a call to |
107 | * thread_exit() when its implementing function returns. |
107 | * thread_exit() when its implementing function returns. |
108 | * |
108 | * |
109 | * interrupts_disable() is assumed. |
109 | * interrupts_disable() is assumed. |
110 | * |
110 | * |
111 | */ |
111 | */ |
112 | static void cushion(void) |
112 | static void cushion(void) |
113 | { |
113 | { |
114 | void (*f)(void *) = THREAD->thread_code; |
114 | void (*f)(void *) = THREAD->thread_code; |
115 | void *arg = THREAD->thread_arg; |
115 | void *arg = THREAD->thread_arg; |
116 | THREAD->last_cycle = get_cycle(); |
116 | THREAD->last_cycle = get_cycle(); |
117 | 117 | ||
118 | /* This is where each thread wakes up after its creation */ |
118 | /* This is where each thread wakes up after its creation */ |
119 | spinlock_unlock(&THREAD->lock); |
119 | spinlock_unlock(&THREAD->lock); |
120 | interrupts_enable(); |
120 | interrupts_enable(); |
121 | 121 | ||
122 | f(arg); |
122 | f(arg); |
123 | 123 | ||
124 | /* Accumulate accounting to the task */ |
124 | /* Accumulate accounting to the task */ |
125 | ipl_t ipl = interrupts_disable(); |
125 | ipl_t ipl = interrupts_disable(); |
126 | 126 | ||
127 | spinlock_lock(&THREAD->lock); |
127 | spinlock_lock(&THREAD->lock); |
128 | if (!THREAD->uncounted) { |
128 | if (!THREAD->uncounted) { |
129 | thread_update_accounting(); |
129 | thread_update_accounting(); |
130 | uint64_t cycles = THREAD->cycles; |
130 | uint64_t cycles = THREAD->cycles; |
131 | THREAD->cycles = 0; |
131 | THREAD->cycles = 0; |
132 | spinlock_unlock(&THREAD->lock); |
132 | spinlock_unlock(&THREAD->lock); |
133 | 133 | ||
134 | spinlock_lock(&TASK->lock); |
134 | spinlock_lock(&TASK->lock); |
135 | TASK->cycles += cycles; |
135 | TASK->cycles += cycles; |
136 | spinlock_unlock(&TASK->lock); |
136 | spinlock_unlock(&TASK->lock); |
137 | } else |
137 | } else |
138 | spinlock_unlock(&THREAD->lock); |
138 | spinlock_unlock(&THREAD->lock); |
139 | 139 | ||
140 | interrupts_restore(ipl); |
140 | interrupts_restore(ipl); |
141 | 141 | ||
142 | thread_exit(); |
142 | thread_exit(); |
143 | /* not reached */ |
143 | /* not reached */ |
144 | } |
144 | } |
145 | 145 | ||
146 | /** Initialization and allocation for thread_t structure */ |
146 | /** Initialization and allocation for thread_t structure */ |
147 | static int thr_constructor(void *obj, int kmflags) |
147 | static int thr_constructor(void *obj, int kmflags) |
148 | { |
148 | { |
149 | thread_t *t = (thread_t *) obj; |
149 | thread_t *t = (thread_t *) obj; |
150 | 150 | ||
151 | spinlock_initialize(&t->lock, "thread_t_lock"); |
151 | spinlock_initialize(&t->lock, "thread_t_lock"); |
152 | link_initialize(&t->rq_link); |
152 | link_initialize(&t->rq_link); |
153 | link_initialize(&t->wq_link); |
153 | link_initialize(&t->wq_link); |
154 | link_initialize(&t->th_link); |
154 | link_initialize(&t->th_link); |
155 | 155 | ||
156 | /* call the architecture-specific part of the constructor */ |
156 | /* call the architecture-specific part of the constructor */ |
157 | thr_constructor_arch(t); |
157 | thr_constructor_arch(t); |
158 | 158 | ||
159 | #ifdef ARCH_HAS_FPU |
159 | #ifdef ARCH_HAS_FPU |
160 | # ifdef CONFIG_FPU_LAZY |
160 | # ifdef CONFIG_FPU_LAZY |
161 | t->saved_fpu_context = NULL; |
161 | t->saved_fpu_context = NULL; |
162 | # else |
162 | # else |
163 | t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags); |
163 | t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags); |
164 | if (!t->saved_fpu_context) |
164 | if (!t->saved_fpu_context) |
165 | return -1; |
165 | return -1; |
166 | # endif |
166 | # endif |
167 | #endif |
167 | #endif |
168 | 168 | ||
169 | t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags); |
169 | t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags); |
170 | if (! t->kstack) { |
170 | if (! t->kstack) { |
171 | #ifdef ARCH_HAS_FPU |
171 | #ifdef ARCH_HAS_FPU |
172 | if (t->saved_fpu_context) |
172 | if (t->saved_fpu_context) |
173 | slab_free(fpu_context_slab,t->saved_fpu_context); |
173 | slab_free(fpu_context_slab,t->saved_fpu_context); |
174 | #endif |
174 | #endif |
175 | return -1; |
175 | return -1; |
176 | } |
176 | } |
177 | 177 | ||
178 | return 0; |
178 | return 0; |
179 | } |
179 | } |
180 | 180 | ||
181 | /** Destruction of thread_t object */ |
181 | /** Destruction of thread_t object */ |
182 | static int thr_destructor(void *obj) |
182 | static int thr_destructor(void *obj) |
183 | { |
183 | { |
184 | thread_t *t = (thread_t *) obj; |
184 | thread_t *t = (thread_t *) obj; |
185 | 185 | ||
186 | /* call the architecture-specific part of the destructor */ |
186 | /* call the architecture-specific part of the destructor */ |
187 | thr_destructor_arch(t); |
187 | thr_destructor_arch(t); |
188 | 188 | ||
189 | frame_free(KA2PA(t->kstack)); |
189 | frame_free(KA2PA(t->kstack)); |
190 | #ifdef ARCH_HAS_FPU |
190 | #ifdef ARCH_HAS_FPU |
191 | if (t->saved_fpu_context) |
191 | if (t->saved_fpu_context) |
192 | slab_free(fpu_context_slab,t->saved_fpu_context); |
192 | slab_free(fpu_context_slab,t->saved_fpu_context); |
193 | #endif |
193 | #endif |
194 | return 1; /* One page freed */ |
194 | return 1; /* One page freed */ |
195 | } |
195 | } |
196 | 196 | ||
197 | /** Initialize threads |
197 | /** Initialize threads |
198 | * |
198 | * |
199 | * Initialize kernel threads support. |
199 | * Initialize kernel threads support. |
200 | * |
200 | * |
201 | */ |
201 | */ |
202 | void thread_init(void) |
202 | void thread_init(void) |
203 | { |
203 | { |
204 | THREAD = NULL; |
204 | THREAD = NULL; |
205 | atomic_set(&nrdy,0); |
205 | atomic_set(&nrdy,0); |
206 | thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0, |
206 | thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0, |
207 | thr_constructor, thr_destructor, 0); |
207 | thr_constructor, thr_destructor, 0); |
208 | 208 | ||
209 | #ifdef ARCH_HAS_FPU |
209 | #ifdef ARCH_HAS_FPU |
210 | fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t), |
210 | fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t), |
211 | FPU_CONTEXT_ALIGN, NULL, NULL, 0); |
211 | FPU_CONTEXT_ALIGN, NULL, NULL, 0); |
212 | #endif |
212 | #endif |
213 | 213 | ||
214 | btree_create(&threads_btree); |
214 | btree_create(&threads_btree); |
215 | } |
215 | } |
216 | 216 | ||
217 | /** Make thread ready |
217 | /** Make thread ready |
218 | * |
218 | * |
219 | * Switch thread t to the ready state. |
219 | * Switch thread t to the ready state. |
220 | * |
220 | * |
221 | * @param t Thread to make ready. |
221 | * @param t Thread to make ready. |
222 | * |
222 | * |
223 | */ |
223 | */ |
224 | void thread_ready(thread_t *t) |
224 | void thread_ready(thread_t *t) |
225 | { |
225 | { |
226 | cpu_t *cpu; |
226 | cpu_t *cpu; |
227 | runq_t *r; |
227 | runq_t *r; |
228 | ipl_t ipl; |
228 | ipl_t ipl; |
229 | int i, avg; |
229 | int i, avg; |
230 | 230 | ||
231 | ipl = interrupts_disable(); |
231 | ipl = interrupts_disable(); |
232 | 232 | ||
233 | spinlock_lock(&t->lock); |
233 | spinlock_lock(&t->lock); |
234 | 234 | ||
235 | ASSERT(! (t->state == Ready)); |
235 | ASSERT(! (t->state == Ready)); |
236 | 236 | ||
237 | i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority; |
237 | i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority; |
238 | 238 | ||
239 | cpu = CPU; |
239 | cpu = CPU; |
240 | if (t->flags & THREAD_FLAG_WIRED) { |
240 | if (t->flags & THREAD_FLAG_WIRED) { |
- | 241 | ASSERT(t->cpu != NULL); |
|
241 | cpu = t->cpu; |
242 | cpu = t->cpu; |
242 | } |
243 | } |
243 | t->state = Ready; |
244 | t->state = Ready; |
244 | spinlock_unlock(&t->lock); |
245 | spinlock_unlock(&t->lock); |
245 | 246 | ||
246 | /* |
247 | /* |
247 | * Append t to respective ready queue on respective processor. |
248 | * Append t to respective ready queue on respective processor. |
248 | */ |
249 | */ |
249 | r = &cpu->rq[i]; |
250 | r = &cpu->rq[i]; |
250 | spinlock_lock(&r->lock); |
251 | spinlock_lock(&r->lock); |
251 | list_append(&t->rq_link, &r->rq_head); |
252 | list_append(&t->rq_link, &r->rq_head); |
252 | r->n++; |
253 | r->n++; |
253 | spinlock_unlock(&r->lock); |
254 | spinlock_unlock(&r->lock); |
254 | 255 | ||
255 | atomic_inc(&nrdy); |
256 | atomic_inc(&nrdy); |
256 | avg = atomic_get(&nrdy) / config.cpu_active; |
257 | avg = atomic_get(&nrdy) / config.cpu_active; |
257 | atomic_inc(&cpu->nrdy); |
258 | atomic_inc(&cpu->nrdy); |
258 | 259 | ||
259 | interrupts_restore(ipl); |
260 | interrupts_restore(ipl); |
260 | } |
261 | } |
261 | 262 | ||
262 | /** Destroy thread memory structure |
263 | /** Destroy thread memory structure |
263 | * |
264 | * |
264 | * Detach thread from all queues, cpus etc. and destroy it. |
265 | * Detach thread from all queues, cpus etc. and destroy it. |
265 | * |
266 | * |
266 | * Assume thread->lock is held!! |
267 | * Assume thread->lock is held!! |
267 | */ |
268 | */ |
268 | void thread_destroy(thread_t *t) |
269 | void thread_destroy(thread_t *t) |
269 | { |
270 | { |
270 | bool destroy_task = false; |
271 | bool destroy_task = false; |
271 | 272 | ||
272 | ASSERT(t->state == Exiting || t->state == Undead); |
273 | ASSERT(t->state == Exiting || t->state == Undead); |
273 | ASSERT(t->task); |
274 | ASSERT(t->task); |
274 | ASSERT(t->cpu); |
275 | ASSERT(t->cpu); |
275 | 276 | ||
276 | spinlock_lock(&t->cpu->lock); |
277 | spinlock_lock(&t->cpu->lock); |
277 | if(t->cpu->fpu_owner == t) |
278 | if(t->cpu->fpu_owner == t) |
278 | t->cpu->fpu_owner = NULL; |
279 | t->cpu->fpu_owner = NULL; |
279 | spinlock_unlock(&t->cpu->lock); |
280 | spinlock_unlock(&t->cpu->lock); |
280 | 281 | ||
281 | spinlock_unlock(&t->lock); |
282 | spinlock_unlock(&t->lock); |
282 | 283 | ||
283 | spinlock_lock(&threads_lock); |
284 | spinlock_lock(&threads_lock); |
284 | btree_remove(&threads_btree, (btree_key_t) ((uintptr_t ) t), NULL); |
285 | btree_remove(&threads_btree, (btree_key_t) ((uintptr_t ) t), NULL); |
285 | spinlock_unlock(&threads_lock); |
286 | spinlock_unlock(&threads_lock); |
286 | 287 | ||
287 | /* |
288 | /* |
288 | * Detach from the containing task. |
289 | * Detach from the containing task. |
289 | */ |
290 | */ |
290 | spinlock_lock(&t->task->lock); |
291 | spinlock_lock(&t->task->lock); |
291 | list_remove(&t->th_link); |
292 | list_remove(&t->th_link); |
292 | if (--t->task->refcount == 0) { |
293 | if (--t->task->refcount == 0) { |
293 | t->task->accept_new_threads = false; |
294 | t->task->accept_new_threads = false; |
294 | destroy_task = true; |
295 | destroy_task = true; |
295 | } |
296 | } |
296 | spinlock_unlock(&t->task->lock); |
297 | spinlock_unlock(&t->task->lock); |
297 | 298 | ||
298 | if (destroy_task) |
299 | if (destroy_task) |
299 | task_destroy(t->task); |
300 | task_destroy(t->task); |
300 | 301 | ||
301 | slab_free(thread_slab, t); |
302 | slab_free(thread_slab, t); |
302 | } |
303 | } |
303 | 304 | ||
304 | /** Create new thread |
305 | /** Create new thread |
305 | * |
306 | * |
306 | * Create a new thread. |
307 | * Create a new thread. |
307 | * |
308 | * |
308 | * @param func Thread's implementing function. |
309 | * @param func Thread's implementing function. |
309 | * @param arg Thread's implementing function argument. |
310 | * @param arg Thread's implementing function argument. |
310 | * @param task Task to which the thread belongs. |
311 | * @param task Task to which the thread belongs. |
311 | * @param flags Thread flags. |
312 | * @param flags Thread flags. |
312 | * @param name Symbolic name. |
313 | * @param name Symbolic name. |
313 | * @param uncounted Thread's accounting doesn't affect accumulated task |
314 | * @param uncounted Thread's accounting doesn't affect accumulated task |
314 | * accounting. |
315 | * accounting. |
315 | * |
316 | * |
316 | * @return New thread's structure on success, NULL on failure. |
317 | * @return New thread's structure on success, NULL on failure. |
317 | * |
318 | * |
318 | */ |
319 | */ |
319 | thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, |
320 | thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, |
320 | int flags, char *name, bool uncounted) |
321 | int flags, char *name, bool uncounted) |
321 | { |
322 | { |
322 | thread_t *t; |
323 | thread_t *t; |
323 | ipl_t ipl; |
324 | ipl_t ipl; |
324 | 325 | ||
325 | t = (thread_t *) slab_alloc(thread_slab, 0); |
326 | t = (thread_t *) slab_alloc(thread_slab, 0); |
326 | if (!t) |
327 | if (!t) |
327 | return NULL; |
328 | return NULL; |
328 | 329 | ||
329 | /* Not needed, but good for debugging */ |
330 | /* Not needed, but good for debugging */ |
330 | memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES, |
331 | memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES, |
331 | 0); |
332 | 0); |
332 | 333 | ||
333 | ipl = interrupts_disable(); |
334 | ipl = interrupts_disable(); |
334 | spinlock_lock(&tidlock); |
335 | spinlock_lock(&tidlock); |
335 | t->tid = ++last_tid; |
336 | t->tid = ++last_tid; |
336 | spinlock_unlock(&tidlock); |
337 | spinlock_unlock(&tidlock); |
337 | interrupts_restore(ipl); |
338 | interrupts_restore(ipl); |
338 | 339 | ||
339 | context_save(&t->saved_context); |
340 | context_save(&t->saved_context); |
340 | context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack, |
341 | context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack, |
341 | THREAD_STACK_SIZE); |
342 | THREAD_STACK_SIZE); |
342 | 343 | ||
343 | the_initialize((the_t *) t->kstack); |
344 | the_initialize((the_t *) t->kstack); |
344 | 345 | ||
345 | ipl = interrupts_disable(); |
346 | ipl = interrupts_disable(); |
346 | t->saved_context.ipl = interrupts_read(); |
347 | t->saved_context.ipl = interrupts_read(); |
347 | interrupts_restore(ipl); |
348 | interrupts_restore(ipl); |
348 | 349 | ||
349 | memcpy(t->name, name, THREAD_NAME_BUFLEN); |
350 | memcpy(t->name, name, THREAD_NAME_BUFLEN); |
350 | 351 | ||
351 | t->thread_code = func; |
352 | t->thread_code = func; |
352 | t->thread_arg = arg; |
353 | t->thread_arg = arg; |
353 | t->ticks = -1; |
354 | t->ticks = -1; |
354 | t->cycles = 0; |
355 | t->cycles = 0; |
355 | t->uncounted = uncounted; |
356 | t->uncounted = uncounted; |
356 | t->priority = -1; /* start in rq[0] */ |
357 | t->priority = -1; /* start in rq[0] */ |
357 | t->cpu = NULL; |
358 | t->cpu = NULL; |
358 | t->flags = flags; |
359 | t->flags = flags; |
359 | t->state = Entering; |
360 | t->state = Entering; |
360 | t->call_me = NULL; |
361 | t->call_me = NULL; |
361 | t->call_me_with = NULL; |
362 | t->call_me_with = NULL; |
362 | 363 | ||
363 | timeout_initialize(&t->sleep_timeout); |
364 | timeout_initialize(&t->sleep_timeout); |
364 | t->sleep_interruptible = false; |
365 | t->sleep_interruptible = false; |
365 | t->sleep_queue = NULL; |
366 | t->sleep_queue = NULL; |
366 | t->timeout_pending = 0; |
367 | t->timeout_pending = 0; |
367 | 368 | ||
368 | t->in_copy_from_uspace = false; |
369 | t->in_copy_from_uspace = false; |
369 | t->in_copy_to_uspace = false; |
370 | t->in_copy_to_uspace = false; |
370 | 371 | ||
371 | t->interrupted = false; |
372 | t->interrupted = false; |
372 | t->join_type = None; |
373 | t->join_type = None; |
373 | t->detached = false; |
374 | t->detached = false; |
374 | waitq_initialize(&t->join_wq); |
375 | waitq_initialize(&t->join_wq); |
375 | 376 | ||
376 | t->rwlock_holder_type = RWLOCK_NONE; |
377 | t->rwlock_holder_type = RWLOCK_NONE; |
377 | 378 | ||
378 | t->task = task; |
379 | t->task = task; |
379 | 380 | ||
380 | t->fpu_context_exists = 0; |
381 | t->fpu_context_exists = 0; |
381 | t->fpu_context_engaged = 0; |
382 | t->fpu_context_engaged = 0; |
382 | 383 | ||
383 | /* might depend on previous initialization */ |
384 | /* might depend on previous initialization */ |
384 | thread_create_arch(t); |
385 | thread_create_arch(t); |
385 | 386 | ||
386 | /* |
387 | /* |
387 | * Attach to the containing task. |
388 | * Attach to the containing task. |
388 | */ |
389 | */ |
389 | ipl = interrupts_disable(); |
390 | ipl = interrupts_disable(); |
390 | spinlock_lock(&task->lock); |
391 | spinlock_lock(&task->lock); |
391 | if (!task->accept_new_threads) { |
392 | if (!task->accept_new_threads) { |
392 | spinlock_unlock(&task->lock); |
393 | spinlock_unlock(&task->lock); |
393 | slab_free(thread_slab, t); |
394 | slab_free(thread_slab, t); |
394 | interrupts_restore(ipl); |
395 | interrupts_restore(ipl); |
395 | return NULL; |
396 | return NULL; |
396 | } |
397 | } |
397 | list_append(&t->th_link, &task->th_head); |
398 | list_append(&t->th_link, &task->th_head); |
398 | if (task->refcount++ == 0) |
399 | if (task->refcount++ == 0) |
399 | task->main_thread = t; |
400 | task->main_thread = t; |
400 | spinlock_unlock(&task->lock); |
401 | spinlock_unlock(&task->lock); |
401 | 402 | ||
402 | /* |
403 | /* |
403 | * Register this thread in the system-wide list. |
404 | * Register this thread in the system-wide list. |
404 | */ |
405 | */ |
405 | spinlock_lock(&threads_lock); |
406 | spinlock_lock(&threads_lock); |
406 | btree_insert(&threads_btree, (btree_key_t) ((uintptr_t) t), (void *) t, |
407 | btree_insert(&threads_btree, (btree_key_t) ((uintptr_t) t), (void *) t, |
407 | NULL); |
408 | NULL); |
408 | spinlock_unlock(&threads_lock); |
409 | spinlock_unlock(&threads_lock); |
409 | 410 | ||
410 | interrupts_restore(ipl); |
411 | interrupts_restore(ipl); |
411 | 412 | ||
412 | return t; |
413 | return t; |
413 | } |
414 | } |
414 | 415 | ||
415 | /** Terminate thread. |
416 | /** Terminate thread. |
416 | * |
417 | * |
417 | * End current thread execution and switch it to the exiting state. All pending |
418 | * End current thread execution and switch it to the exiting state. All pending |
418 | * timeouts are executed. |
419 | * timeouts are executed. |
419 | */ |
420 | */ |
420 | void thread_exit(void) |
421 | void thread_exit(void) |
421 | { |
422 | { |
422 | ipl_t ipl; |
423 | ipl_t ipl; |
423 | 424 | ||
424 | restart: |
425 | restart: |
425 | ipl = interrupts_disable(); |
426 | ipl = interrupts_disable(); |
426 | spinlock_lock(&THREAD->lock); |
427 | spinlock_lock(&THREAD->lock); |
427 | if (THREAD->timeout_pending) { |
428 | if (THREAD->timeout_pending) { |
428 | /* busy waiting for timeouts in progress */ |
429 | /* busy waiting for timeouts in progress */ |
429 | spinlock_unlock(&THREAD->lock); |
430 | spinlock_unlock(&THREAD->lock); |
430 | interrupts_restore(ipl); |
431 | interrupts_restore(ipl); |
431 | goto restart; |
432 | goto restart; |
432 | } |
433 | } |
433 | THREAD->state = Exiting; |
434 | THREAD->state = Exiting; |
434 | spinlock_unlock(&THREAD->lock); |
435 | spinlock_unlock(&THREAD->lock); |
435 | scheduler(); |
436 | scheduler(); |
436 | 437 | ||
437 | /* Not reached */ |
438 | /* Not reached */ |
438 | while (1) |
439 | while (1) |
439 | ; |
440 | ; |
440 | } |
441 | } |
441 | 442 | ||
442 | 443 | ||
443 | /** Thread sleep |
444 | /** Thread sleep |
444 | * |
445 | * |
445 | * Suspend execution of the current thread. |
446 | * Suspend execution of the current thread. |
446 | * |
447 | * |
447 | * @param sec Number of seconds to sleep. |
448 | * @param sec Number of seconds to sleep. |
448 | * |
449 | * |
449 | */ |
450 | */ |
450 | void thread_sleep(uint32_t sec) |
451 | void thread_sleep(uint32_t sec) |
451 | { |
452 | { |
452 | thread_usleep(sec * 1000000); |
453 | thread_usleep(sec * 1000000); |
453 | } |
454 | } |
454 | 455 | ||
455 | /** Wait for another thread to exit. |
456 | /** Wait for another thread to exit. |
456 | * |
457 | * |
457 | * @param t Thread to join on exit. |
458 | * @param t Thread to join on exit. |
458 | * @param usec Timeout in microseconds. |
459 | * @param usec Timeout in microseconds. |
459 | * @param flags Mode of operation. |
460 | * @param flags Mode of operation. |
460 | * |
461 | * |
461 | * @return An error code from errno.h or an error code from synch.h. |
462 | * @return An error code from errno.h or an error code from synch.h. |
462 | */ |
463 | */ |
463 | int thread_join_timeout(thread_t *t, uint32_t usec, int flags) |
464 | int thread_join_timeout(thread_t *t, uint32_t usec, int flags) |
464 | { |
465 | { |
465 | ipl_t ipl; |
466 | ipl_t ipl; |
466 | int rc; |
467 | int rc; |
467 | 468 | ||
468 | if (t == THREAD) |
469 | if (t == THREAD) |
469 | return EINVAL; |
470 | return EINVAL; |
470 | 471 | ||
471 | /* |
472 | /* |
472 | * Since thread join can only be called once on an undetached thread, |
473 | * Since thread join can only be called once on an undetached thread, |
473 | * the thread pointer is guaranteed to be still valid. |
474 | * the thread pointer is guaranteed to be still valid. |
474 | */ |
475 | */ |
475 | 476 | ||
476 | ipl = interrupts_disable(); |
477 | ipl = interrupts_disable(); |
477 | spinlock_lock(&t->lock); |
478 | spinlock_lock(&t->lock); |
478 | ASSERT(!t->detached); |
479 | ASSERT(!t->detached); |
479 | spinlock_unlock(&t->lock); |
480 | spinlock_unlock(&t->lock); |
480 | interrupts_restore(ipl); |
481 | interrupts_restore(ipl); |
481 | 482 | ||
482 | rc = waitq_sleep_timeout(&t->join_wq, usec, flags); |
483 | rc = waitq_sleep_timeout(&t->join_wq, usec, flags); |
483 | 484 | ||
484 | return rc; |
485 | return rc; |
485 | } |
486 | } |
486 | 487 | ||
487 | /** Detach thread. |
488 | /** Detach thread. |
488 | * |
489 | * |
489 | * Mark the thread as detached, if the thread is already in the Undead state, |
490 | * Mark the thread as detached, if the thread is already in the Undead state, |
490 | * deallocate its resources. |
491 | * deallocate its resources. |
491 | * |
492 | * |
492 | * @param t Thread to be detached. |
493 | * @param t Thread to be detached. |
493 | */ |
494 | */ |
494 | void thread_detach(thread_t *t) |
495 | void thread_detach(thread_t *t) |
495 | { |
496 | { |
496 | ipl_t ipl; |
497 | ipl_t ipl; |
497 | 498 | ||
498 | /* |
499 | /* |
499 | * Since the thread is expected not to be already detached, |
500 | * Since the thread is expected not to be already detached, |
500 | * pointer to it must be still valid. |
501 | * pointer to it must be still valid. |
501 | */ |
502 | */ |
502 | ipl = interrupts_disable(); |
503 | ipl = interrupts_disable(); |
503 | spinlock_lock(&t->lock); |
504 | spinlock_lock(&t->lock); |
504 | ASSERT(!t->detached); |
505 | ASSERT(!t->detached); |
505 | if (t->state == Undead) { |
506 | if (t->state == Undead) { |
506 | thread_destroy(t); /* unlocks &t->lock */ |
507 | thread_destroy(t); /* unlocks &t->lock */ |
507 | interrupts_restore(ipl); |
508 | interrupts_restore(ipl); |
508 | return; |
509 | return; |
509 | } else { |
510 | } else { |
510 | t->detached = true; |
511 | t->detached = true; |
511 | } |
512 | } |
512 | spinlock_unlock(&t->lock); |
513 | spinlock_unlock(&t->lock); |
513 | interrupts_restore(ipl); |
514 | interrupts_restore(ipl); |
514 | } |
515 | } |
515 | 516 | ||
516 | /** Thread usleep |
517 | /** Thread usleep |
517 | * |
518 | * |
518 | * Suspend execution of the current thread. |
519 | * Suspend execution of the current thread. |
519 | * |
520 | * |
520 | * @param usec Number of microseconds to sleep. |
521 | * @param usec Number of microseconds to sleep. |
521 | * |
522 | * |
522 | */ |
523 | */ |
523 | void thread_usleep(uint32_t usec) |
524 | void thread_usleep(uint32_t usec) |
524 | { |
525 | { |
525 | waitq_t wq; |
526 | waitq_t wq; |
526 | 527 | ||
527 | waitq_initialize(&wq); |
528 | waitq_initialize(&wq); |
528 | 529 | ||
529 | (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING); |
530 | (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING); |
530 | } |
531 | } |
531 | 532 | ||
532 | /** Register thread out-of-context invocation |
533 | /** Register thread out-of-context invocation |
533 | * |
534 | * |
534 | * Register a function and its argument to be executed |
535 | * Register a function and its argument to be executed |
535 | * on next context switch to the current thread. |
536 | * on next context switch to the current thread. |
536 | * |
537 | * |
537 | * @param call_me Out-of-context function. |
538 | * @param call_me Out-of-context function. |
538 | * @param call_me_with Out-of-context function argument. |
539 | * @param call_me_with Out-of-context function argument. |
539 | * |
540 | * |
540 | */ |
541 | */ |
541 | void thread_register_call_me(void (* call_me)(void *), void *call_me_with) |
542 | void thread_register_call_me(void (* call_me)(void *), void *call_me_with) |
542 | { |
543 | { |
543 | ipl_t ipl; |
544 | ipl_t ipl; |
544 | 545 | ||
545 | ipl = interrupts_disable(); |
546 | ipl = interrupts_disable(); |
546 | spinlock_lock(&THREAD->lock); |
547 | spinlock_lock(&THREAD->lock); |
547 | THREAD->call_me = call_me; |
548 | THREAD->call_me = call_me; |
548 | THREAD->call_me_with = call_me_with; |
549 | THREAD->call_me_with = call_me_with; |
549 | spinlock_unlock(&THREAD->lock); |
550 | spinlock_unlock(&THREAD->lock); |
550 | interrupts_restore(ipl); |
551 | interrupts_restore(ipl); |
551 | } |
552 | } |
552 | 553 | ||
553 | /** Print list of threads debug info */ |
554 | /** Print list of threads debug info */ |
554 | void thread_print_list(void) |
555 | void thread_print_list(void) |
555 | { |
556 | { |
556 | link_t *cur; |
557 | link_t *cur; |
557 | ipl_t ipl; |
558 | ipl_t ipl; |
558 | 559 | ||
559 | /* Messing with thread structures, avoid deadlock */ |
560 | /* Messing with thread structures, avoid deadlock */ |
560 | ipl = interrupts_disable(); |
561 | ipl = interrupts_disable(); |
561 | spinlock_lock(&threads_lock); |
562 | spinlock_lock(&threads_lock); |
562 | 563 | ||
563 | printf("tid name address state task ctx code " |
564 | printf("tid name address state task ctx code " |
564 | " stack cycles cpu kstack waitqueue\n"); |
565 | " stack cycles cpu kstack waitqueue\n"); |
565 | printf("------ ---------- ---------- -------- ---------- --- --------" |
566 | printf("------ ---------- ---------- -------- ---------- --- --------" |
566 | "-- ---------- ---------- ---- ---------- ----------\n"); |
567 | "-- ---------- ---------- ---- ---------- ----------\n"); |
567 | 568 | ||
568 | for (cur = threads_btree.leaf_head.next; |
569 | for (cur = threads_btree.leaf_head.next; |
569 | cur != &threads_btree.leaf_head; cur = cur->next) { |
570 | cur != &threads_btree.leaf_head; cur = cur->next) { |
570 | btree_node_t *node; |
571 | btree_node_t *node; |
571 | unsigned int i; |
572 | unsigned int i; |
572 | 573 | ||
573 | node = list_get_instance(cur, btree_node_t, leaf_link); |
574 | node = list_get_instance(cur, btree_node_t, leaf_link); |
574 | for (i = 0; i < node->keys; i++) { |
575 | for (i = 0; i < node->keys; i++) { |
575 | thread_t *t; |
576 | thread_t *t; |
576 | 577 | ||
577 | t = (thread_t *) node->value[i]; |
578 | t = (thread_t *) node->value[i]; |
578 | 579 | ||
579 | uint64_t cycles; |
580 | uint64_t cycles; |
580 | char suffix; |
581 | char suffix; |
581 | order(t->cycles, &cycles, &suffix); |
582 | order(t->cycles, &cycles, &suffix); |
582 | 583 | ||
583 | printf("%-6llu %-10s %#10zx %-8s %#10zx %-3ld %#10zx " |
584 | printf("%-6llu %-10s %#10zx %-8s %#10zx %-3ld %#10zx " |
584 | "%#10zx %9llu%c ", t->tid, t->name, t, |
585 | "%#10zx %9llu%c ", t->tid, t->name, t, |
585 | thread_states[t->state], t->task, t->task->context, |
586 | thread_states[t->state], t->task, t->task->context, |
586 | t->thread_code, t->kstack, cycles, suffix); |
587 | t->thread_code, t->kstack, cycles, suffix); |
587 | 588 | ||
588 | if (t->cpu) |
589 | if (t->cpu) |
589 | printf("%-4zd", t->cpu->id); |
590 | printf("%-4zd", t->cpu->id); |
590 | else |
591 | else |
591 | printf("none"); |
592 | printf("none"); |
592 | 593 | ||
593 | if (t->state == Sleeping) |
594 | if (t->state == Sleeping) |
594 | printf(" %#10zx %#10zx", t->kstack, |
595 | printf(" %#10zx %#10zx", t->kstack, |
595 | t->sleep_queue); |
596 | t->sleep_queue); |
596 | 597 | ||
597 | printf("\n"); |
598 | printf("\n"); |
598 | } |
599 | } |
599 | } |
600 | } |
600 | 601 | ||
601 | spinlock_unlock(&threads_lock); |
602 | spinlock_unlock(&threads_lock); |
602 | interrupts_restore(ipl); |
603 | interrupts_restore(ipl); |
603 | } |
604 | } |
604 | 605 | ||
605 | /** Check whether thread exists. |
606 | /** Check whether thread exists. |
606 | * |
607 | * |
607 | * Note that threads_lock must be already held and |
608 | * Note that threads_lock must be already held and |
608 | * interrupts must be already disabled. |
609 | * interrupts must be already disabled. |
609 | * |
610 | * |
610 | * @param t Pointer to thread. |
611 | * @param t Pointer to thread. |
611 | * |
612 | * |
612 | * @return True if thread t is known to the system, false otherwise. |
613 | * @return True if thread t is known to the system, false otherwise. |
613 | */ |
614 | */ |
614 | bool thread_exists(thread_t *t) |
615 | bool thread_exists(thread_t *t) |
615 | { |
616 | { |
616 | btree_node_t *leaf; |
617 | btree_node_t *leaf; |
617 | 618 | ||
618 | return btree_search(&threads_btree, (btree_key_t) ((uintptr_t) t), |
619 | return btree_search(&threads_btree, (btree_key_t) ((uintptr_t) t), |
619 | &leaf) != NULL; |
620 | &leaf) != NULL; |
620 | } |
621 | } |
621 | 622 | ||
622 | 623 | ||
623 | /** Update accounting of current thread. |
624 | /** Update accounting of current thread. |
624 | * |
625 | * |
625 | * Note that thread_lock on THREAD must be already held and |
626 | * Note that thread_lock on THREAD must be already held and |
626 | * interrupts must be already disabled. |
627 | * interrupts must be already disabled. |
627 | * |
628 | * |
628 | */ |
629 | */ |
629 | void thread_update_accounting(void) |
630 | void thread_update_accounting(void) |
630 | { |
631 | { |
631 | uint64_t time = get_cycle(); |
632 | uint64_t time = get_cycle(); |
632 | THREAD->cycles += time - THREAD->last_cycle; |
633 | THREAD->cycles += time - THREAD->last_cycle; |
633 | THREAD->last_cycle = time; |
634 | THREAD->last_cycle = time; |
634 | } |
635 | } |
635 | 636 | ||
636 | /** Process syscall to create new thread. |
637 | /** Process syscall to create new thread. |
637 | * |
638 | * |
638 | */ |
639 | */ |
639 | unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name, thread_id_t *uspace_thread_id) |
640 | unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name, thread_id_t *uspace_thread_id) |
640 | { |
641 | { |
641 | thread_t *t; |
642 | thread_t *t; |
642 | char namebuf[THREAD_NAME_BUFLEN]; |
643 | char namebuf[THREAD_NAME_BUFLEN]; |
643 | uspace_arg_t *kernel_uarg; |
644 | uspace_arg_t *kernel_uarg; |
644 | int rc; |
645 | int rc; |
645 | 646 | ||
646 | rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN); |
647 | rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN); |
647 | if (rc != 0) |
648 | if (rc != 0) |
648 | return (unative_t) rc; |
649 | return (unative_t) rc; |
649 | 650 | ||
650 | kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0); |
651 | kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0); |
651 | rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t)); |
652 | rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t)); |
652 | if (rc != 0) { |
653 | if (rc != 0) { |
653 | free(kernel_uarg); |
654 | free(kernel_uarg); |
654 | return (unative_t) rc; |
655 | return (unative_t) rc; |
655 | } |
656 | } |
656 | 657 | ||
657 | t = thread_create(uinit, kernel_uarg, TASK, THREAD_FLAG_USPACE, namebuf, |
658 | t = thread_create(uinit, kernel_uarg, TASK, THREAD_FLAG_USPACE, namebuf, |
658 | false); |
659 | false); |
659 | if (t) { |
660 | if (t) { |
660 | thread_ready(t); |
661 | thread_ready(t); |
661 | if (uspace_thread_id != NULL) |
662 | if (uspace_thread_id != NULL) |
662 | return (unative_t) copy_to_uspace(uspace_thread_id, &t->tid, |
663 | return (unative_t) copy_to_uspace(uspace_thread_id, &t->tid, |
663 | sizeof(t->tid)); |
664 | sizeof(t->tid)); |
664 | else |
665 | else |
665 | return 0; |
666 | return 0; |
666 | } else |
667 | } else |
667 | free(kernel_uarg); |
668 | free(kernel_uarg); |
668 | 669 | ||
669 | return (unative_t) ENOMEM; |
670 | return (unative_t) ENOMEM; |
670 | } |
671 | } |
671 | 672 | ||
672 | /** Process syscall to terminate thread. |
673 | /** Process syscall to terminate thread. |
673 | * |
674 | * |
674 | */ |
675 | */ |
675 | unative_t sys_thread_exit(int uspace_status) |
676 | unative_t sys_thread_exit(int uspace_status) |
676 | { |
677 | { |
677 | thread_exit(); |
678 | thread_exit(); |
678 | /* Unreachable */ |
679 | /* Unreachable */ |
679 | return 0; |
680 | return 0; |
680 | } |
681 | } |
681 | 682 | ||
682 | /** Syscall for getting TID. |
683 | /** Syscall for getting TID. |
683 | * |
684 | * |
684 | * @param uspace_thread_id Userspace address of 8-byte buffer where to store |
685 | * @param uspace_thread_id Userspace address of 8-byte buffer where to store |
685 | * current thread ID. |
686 | * current thread ID. |
686 | * |
687 | * |
687 | * @return 0 on success or an error code from @ref errno.h. |
688 | * @return 0 on success or an error code from @ref errno.h. |
688 | */ |
689 | */ |
689 | unative_t sys_thread_get_id(thread_id_t *uspace_thread_id) |
690 | unative_t sys_thread_get_id(thread_id_t *uspace_thread_id) |
690 | { |
691 | { |
691 | /* |
692 | /* |
692 | * No need to acquire lock on THREAD because tid |
693 | * No need to acquire lock on THREAD because tid |
693 | * remains constant for the lifespan of the thread. |
694 | * remains constant for the lifespan of the thread. |
694 | */ |
695 | */ |
695 | return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid, |
696 | return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid, |
696 | sizeof(THREAD->tid)); |
697 | sizeof(THREAD->tid)); |
697 | } |
698 | } |
698 | 699 | ||
699 | /** @} |
700 | /** @} |
700 | */ |
701 | */ |
701 | 702 |