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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 jermar 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
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
15
 *   derived from this software without specific prior written permission.
16
 *
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
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1757 jermar 29
/** @addtogroup genericproc
1702 cejka 30
 * @{
31
 */
32
 
1248 jermar 33
/**
1702 cejka 34
 * @file
1248 jermar 35
 * @brief   Thread management functions.
36
 */
37
 
1 jermar 38
#include <proc/scheduler.h>
39
#include <proc/thread.h>
40
#include <proc/task.h>
1078 jermar 41
#include <proc/uarg.h>
1 jermar 42
#include <mm/frame.h>
43
#include <mm/page.h>
44
#include <arch/asm.h>
2030 decky 45
#include <arch/cycle.h>
1 jermar 46
#include <arch.h>
47
#include <synch/synch.h>
48
#include <synch/spinlock.h>
49
#include <synch/waitq.h>
50
#include <synch/rwlock.h>
51
#include <cpu.h>
52
#include <func.h>
53
#include <context.h>
1158 jermar 54
#include <adt/btree.h>
788 jermar 55
#include <adt/list.h>
1 jermar 56
#include <time/clock.h>
2089 decky 57
#include <time/timeout.h>
7 jermar 58
#include <config.h>
59
#include <arch/interrupt.h>
10 jermar 60
#include <smp/ipi.h>
76 jermar 61
#include <arch/faddr.h>
1104 jermar 62
#include <atomic.h>
195 vana 63
#include <memstr.h>
777 palkovsky 64
#include <print.h>
787 palkovsky 65
#include <mm/slab.h>
66
#include <debug.h>
1066 jermar 67
#include <main/uinit.h>
1288 jermar 68
#include <syscall/copy.h>
69
#include <errno.h>
7 jermar 70
 
1 jermar 71
 
1571 jermar 72
/** Thread states */
73
char *thread_states[] = {
74
    "Invalid",
75
    "Running",
76
    "Sleeping",
77
    "Ready",
78
    "Entering",
79
    "Exiting",
80
    "Undead"
81
};
82
 
2067 jermar 83
/** Lock protecting the threads_btree B+tree.
84
 *
85
 * For locking rules, see declaration thereof.
86
 */
1158 jermar 87
SPINLOCK_INITIALIZE(threads_lock);
1 jermar 88
 
1636 jermar 89
/** B+tree of all threads.
90
 *
2067 jermar 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.
1636 jermar 93
 */
94
btree_t threads_btree;     
95
 
623 jermar 96
SPINLOCK_INITIALIZE(tidlock);
2216 decky 97
thread_id_t last_tid = 0;
1 jermar 98
 
787 palkovsky 99
static slab_cache_t *thread_slab;
906 palkovsky 100
#ifdef ARCH_HAS_FPU
101
slab_cache_t *fpu_context_slab;
102
#endif
107 decky 103
 
2067 jermar 104
/** Thread wrapper.
107 decky 105
 *
2067 jermar 106
 * This wrapper is provided to ensure that every thread makes a call to
107
 * thread_exit() when its implementing function returns.
1 jermar 108
 *
413 jermar 109
 * interrupts_disable() is assumed.
107 decky 110
 *
1 jermar 111
 */
452 decky 112
static void cushion(void)
1 jermar 113
{
15 jermar 114
    void (*f)(void *) = THREAD->thread_code;
115
    void *arg = THREAD->thread_arg;
2032 decky 116
    THREAD->last_cycle = get_cycle();
1 jermar 117
 
2039 decky 118
    /* This is where each thread wakes up after its creation */
15 jermar 119
    spinlock_unlock(&THREAD->lock);
413 jermar 120
    interrupts_enable();
1 jermar 121
 
122
    f(arg);
2039 decky 123
 
124
    /* Accumulate accounting to the task */
125
    ipl_t ipl = interrupts_disable();
126
 
127
    spinlock_lock(&THREAD->lock);
2042 decky 128
    if (!THREAD->uncounted) {
129
        thread_update_accounting();
130
        uint64_t cycles = THREAD->cycles;
131
        THREAD->cycles = 0;
132
        spinlock_unlock(&THREAD->lock);
133
 
134
        spinlock_lock(&TASK->lock);
135
        TASK->cycles += cycles;
136
        spinlock_unlock(&TASK->lock);
137
    } else
138
        spinlock_unlock(&THREAD->lock);
2039 decky 139
 
140
    interrupts_restore(ipl);
141
 
1 jermar 142
    thread_exit();
143
    /* not reached */
144
}
145
 
787 palkovsky 146
/** Initialization and allocation for thread_t structure */
147
static int thr_constructor(void *obj, int kmflags)
148
{
1820 decky 149
    thread_t *t = (thread_t *) obj;
107 decky 150
 
787 palkovsky 151
    spinlock_initialize(&t->lock, "thread_t_lock");
152
    link_initialize(&t->rq_link);
153
    link_initialize(&t->wq_link);
154
    link_initialize(&t->th_link);
1854 jermar 155
 
156
    /* call the architecture-specific part of the constructor */
157
    thr_constructor_arch(t);
787 palkovsky 158
 
906 palkovsky 159
#ifdef ARCH_HAS_FPU
160
#  ifdef CONFIG_FPU_LAZY
161
    t->saved_fpu_context = NULL;
162
#  else
163
    t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
164
    if (!t->saved_fpu_context)
165
        return -1;
166
#  endif
167
#endif  
168
 
2118 decky 169
    t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags);
1766 palkovsky 170
    if (! t->kstack) {
906 palkovsky 171
#ifdef ARCH_HAS_FPU
172
        if (t->saved_fpu_context)
173
            slab_free(fpu_context_slab,t->saved_fpu_context);
174
#endif
842 palkovsky 175
        return -1;
906 palkovsky 176
    }
787 palkovsky 177
 
178
    return 0;
179
}
180
 
181
/** Destruction of thread_t object */
182
static int thr_destructor(void *obj)
183
{
1820 decky 184
    thread_t *t = (thread_t *) obj;
787 palkovsky 185
 
1854 jermar 186
    /* call the architecture-specific part of the destructor */
187
    thr_destructor_arch(t);
188
 
1760 palkovsky 189
    frame_free(KA2PA(t->kstack));
906 palkovsky 190
#ifdef ARCH_HAS_FPU
191
    if (t->saved_fpu_context)
192
        slab_free(fpu_context_slab,t->saved_fpu_context);
193
#endif
787 palkovsky 194
    return 1; /* One page freed */
195
}
196
 
107 decky 197
/** Initialize threads
198
 *
199
 * Initialize kernel threads support.
200
 *
201
 */
1 jermar 202
void thread_init(void)
203
{
15 jermar 204
    THREAD = NULL;
625 palkovsky 205
    atomic_set(&nrdy,0);
2067 jermar 206
    thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
2087 jermar 207
        thr_constructor, thr_destructor, 0);
2067 jermar 208
 
906 palkovsky 209
#ifdef ARCH_HAS_FPU
2067 jermar 210
    fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
2087 jermar 211
        FPU_CONTEXT_ALIGN, NULL, NULL, 0);
906 palkovsky 212
#endif
1158 jermar 213
 
214
    btree_create(&threads_btree);
1 jermar 215
}
216
 
107 decky 217
/** Make thread ready
218
 *
219
 * Switch thread t to the ready state.
220
 *
221
 * @param t Thread to make ready.
222
 *
223
 */
1 jermar 224
void thread_ready(thread_t *t)
225
{
226
    cpu_t *cpu;
227
    runq_t *r;
413 jermar 228
    ipl_t ipl;
625 palkovsky 229
    int i, avg;
1 jermar 230
 
413 jermar 231
    ipl = interrupts_disable();
1 jermar 232
 
233
    spinlock_lock(&t->lock);
234
 
1086 palkovsky 235
    ASSERT(! (t->state == Ready));
236
 
2067 jermar 237
    i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;
1 jermar 238
 
16 jermar 239
    cpu = CPU;
1854 jermar 240
    if (t->flags & THREAD_FLAG_WIRED) {
2268 jermar 241
        ASSERT(t->cpu != NULL);
1 jermar 242
        cpu = t->cpu;
243
    }
1083 palkovsky 244
    t->state = Ready;
1 jermar 245
    spinlock_unlock(&t->lock);
246
 
107 decky 247
    /*
1 jermar 248
     * Append t to respective ready queue on respective processor.
249
     */
250
    r = &cpu->rq[i];
251
    spinlock_lock(&r->lock);
252
    list_append(&t->rq_link, &r->rq_head);
253
    r->n++;
254
    spinlock_unlock(&r->lock);
255
 
475 jermar 256
    atomic_inc(&nrdy);
625 palkovsky 257
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 258
    atomic_inc(&cpu->nrdy);
1 jermar 259
 
413 jermar 260
    interrupts_restore(ipl);
1 jermar 261
}
262
 
787 palkovsky 263
/** Destroy thread memory structure
264
 *
265
 * Detach thread from all queues, cpus etc. and destroy it.
266
 *
267
 * Assume thread->lock is held!!
268
 */
269
void thread_destroy(thread_t *t)
270
{
2067 jermar 271
    bool destroy_task = false;
1579 jermar 272
 
1581 jermar 273
    ASSERT(t->state == Exiting || t->state == Undead);
787 palkovsky 274
    ASSERT(t->task);
275
    ASSERT(t->cpu);
276
 
277
    spinlock_lock(&t->cpu->lock);
2067 jermar 278
    if(t->cpu->fpu_owner == t)
279
        t->cpu->fpu_owner = NULL;
787 palkovsky 280
    spinlock_unlock(&t->cpu->lock);
281
 
1579 jermar 282
    spinlock_unlock(&t->lock);
283
 
284
    spinlock_lock(&threads_lock);
1780 jermar 285
    btree_remove(&threads_btree, (btree_key_t) ((uintptr_t ) t), NULL);
1579 jermar 286
    spinlock_unlock(&threads_lock);
287
 
787 palkovsky 288
    /*
289
     * Detach from the containing task.
290
     */
291
    spinlock_lock(&t->task->lock);
292
    list_remove(&t->th_link);
1579 jermar 293
    if (--t->task->refcount == 0) {
294
        t->task->accept_new_threads = false;
295
        destroy_task = true;
296
    }
297
    spinlock_unlock(&t->task->lock);   
787 palkovsky 298
 
1579 jermar 299
    if (destroy_task)
300
        task_destroy(t->task);
787 palkovsky 301
 
302
    slab_free(thread_slab, t);
303
}
304
 
107 decky 305
/** Create new thread
306
 *
307
 * Create a new thread.
308
 *
2042 decky 309
 * @param func      Thread's implementing function.
310
 * @param arg       Thread's implementing function argument.
311
 * @param task      Task to which the thread belongs.
312
 * @param flags     Thread flags.
313
 * @param name      Symbolic name.
2067 jermar 314
 * @param uncounted Thread's accounting doesn't affect accumulated task
315
 *   accounting.
107 decky 316
 *
317
 * @return New thread's structure on success, NULL on failure.
318
 *
319
 */
2067 jermar 320
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
321
    int flags, char *name, bool uncounted)
1 jermar 322
{
323
    thread_t *t;
822 palkovsky 324
    ipl_t ipl;
325
 
787 palkovsky 326
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 327
    if (!t)
328
        return NULL;
1 jermar 329
 
822 palkovsky 330
    /* Not needed, but good for debugging */
2067 jermar 331
    memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES,
2087 jermar 332
        0);
822 palkovsky 333
 
334
    ipl = interrupts_disable();
335
    spinlock_lock(&tidlock);
336
    t->tid = ++last_tid;
337
    spinlock_unlock(&tidlock);
338
    interrupts_restore(ipl);
339
 
340
    context_save(&t->saved_context);
2067 jermar 341
    context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
2087 jermar 342
        THREAD_STACK_SIZE);
822 palkovsky 343
 
344
    the_initialize((the_t *) t->kstack);
345
 
346
    ipl = interrupts_disable();
347
    t->saved_context.ipl = interrupts_read();
348
    interrupts_restore(ipl);
349
 
1066 jermar 350
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
351
 
822 palkovsky 352
    t->thread_code = func;
353
    t->thread_arg = arg;
354
    t->ticks = -1;
2030 decky 355
    t->cycles = 0;
2042 decky 356
    t->uncounted = uncounted;
822 palkovsky 357
    t->priority = -1;       /* start in rq[0] */
358
    t->cpu = NULL;
1854 jermar 359
    t->flags = flags;
822 palkovsky 360
    t->state = Entering;
361
    t->call_me = NULL;
362
    t->call_me_with = NULL;
363
 
364
    timeout_initialize(&t->sleep_timeout);
1502 jermar 365
    t->sleep_interruptible = false;
822 palkovsky 366
    t->sleep_queue = NULL;
367
    t->timeout_pending = 0;
1288 jermar 368
 
369
    t->in_copy_from_uspace = false;
370
    t->in_copy_to_uspace = false;
1579 jermar 371
 
372
    t->interrupted = false;
1661 jermar 373
    t->join_type = None;
1571 jermar 374
    t->detached = false;
375
    waitq_initialize(&t->join_wq);
376
 
822 palkovsky 377
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 378
 
822 palkovsky 379
    t->task = task;
380
 
860 decky 381
    t->fpu_context_exists = 0;
382
    t->fpu_context_engaged = 0;
1854 jermar 383
 
2067 jermar 384
    /* might depend on previous initialization */
385
    thread_create_arch(t); 
822 palkovsky 386
 
387
    /*
1579 jermar 388
     * Attach to the containing task.
389
     */
1687 jermar 390
    ipl = interrupts_disable();  
1579 jermar 391
    spinlock_lock(&task->lock);
392
    if (!task->accept_new_threads) {
393
        spinlock_unlock(&task->lock);
394
        slab_free(thread_slab, t);
1687 jermar 395
        interrupts_restore(ipl);
1579 jermar 396
        return NULL;
397
    }
398
    list_append(&t->th_link, &task->th_head);
1585 jermar 399
    if (task->refcount++ == 0)
400
        task->main_thread = t;
1579 jermar 401
    spinlock_unlock(&task->lock);
402
 
403
    /*
822 palkovsky 404
     * Register this thread in the system-wide list.
405
     */
406
    spinlock_lock(&threads_lock);
2067 jermar 407
    btree_insert(&threads_btree, (btree_key_t) ((uintptr_t) t), (void *) t,
2087 jermar 408
        NULL);
822 palkovsky 409
    spinlock_unlock(&threads_lock);
410
 
411
    interrupts_restore(ipl);
860 decky 412
 
1 jermar 413
    return t;
414
}
415
 
1687 jermar 416
/** Terminate thread.
107 decky 417
 *
2067 jermar 418
 * End current thread execution and switch it to the exiting state. All pending
419
 * timeouts are executed.
107 decky 420
 */
1 jermar 421
void thread_exit(void)
422
{
413 jermar 423
    ipl_t ipl;
1 jermar 424
 
425
restart:
413 jermar 426
    ipl = interrupts_disable();
15 jermar 427
    spinlock_lock(&THREAD->lock);
2067 jermar 428
    if (THREAD->timeout_pending) {
429
        /* busy waiting for timeouts in progress */
15 jermar 430
        spinlock_unlock(&THREAD->lock);
413 jermar 431
        interrupts_restore(ipl);
1 jermar 432
        goto restart;
433
    }
15 jermar 434
    THREAD->state = Exiting;
435
    spinlock_unlock(&THREAD->lock);
1 jermar 436
    scheduler();
1595 palkovsky 437
 
438
    /* Not reached */
439
    while (1)
440
        ;
1 jermar 441
}
442
 
107 decky 443
 
444
/** Thread sleep
445
 *
446
 * Suspend execution of the current thread.
447
 *
448
 * @param sec Number of seconds to sleep.
449
 *
450
 */
1780 jermar 451
void thread_sleep(uint32_t sec)
1 jermar 452
{
2067 jermar 453
    thread_usleep(sec * 1000000);
1 jermar 454
}
107 decky 455
 
1571 jermar 456
/** Wait for another thread to exit.
457
 *
458
 * @param t Thread to join on exit.
459
 * @param usec Timeout in microseconds.
460
 * @param flags Mode of operation.
461
 *
462
 * @return An error code from errno.h or an error code from synch.h.
463
 */
1780 jermar 464
int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
1571 jermar 465
{
466
    ipl_t ipl;
467
    int rc;
468
 
469
    if (t == THREAD)
470
        return EINVAL;
471
 
472
    /*
473
     * Since thread join can only be called once on an undetached thread,
474
     * the thread pointer is guaranteed to be still valid.
475
     */
476
 
477
    ipl = interrupts_disable();
478
    spinlock_lock(&t->lock);
479
    ASSERT(!t->detached);
480
    spinlock_unlock(&t->lock);
1687 jermar 481
    interrupts_restore(ipl);
1571 jermar 482
 
1687 jermar 483
    rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
1571 jermar 484
 
485
    return rc; 
486
}
487
 
488
/** Detach thread.
489
 *
490
 * Mark the thread as detached, if the thread is already in the Undead state,
491
 * deallocate its resources.
492
 *
493
 * @param t Thread to be detached.
494
 */
495
void thread_detach(thread_t *t)
496
{
497
    ipl_t ipl;
498
 
499
    /*
2183 jermar 500
     * Since the thread is expected not to be already detached,
1571 jermar 501
     * pointer to it must be still valid.
502
     */
503
    ipl = interrupts_disable();
504
    spinlock_lock(&t->lock);
505
    ASSERT(!t->detached);
506
    if (t->state == Undead) {
507
        thread_destroy(t);  /* unlocks &t->lock */
508
        interrupts_restore(ipl);
509
        return;
510
    } else {
511
        t->detached = true;
512
    }
513
    spinlock_unlock(&t->lock);
514
    interrupts_restore(ipl);
515
}
516
 
107 decky 517
/** Thread usleep
518
 *
519
 * Suspend execution of the current thread.
520
 *
521
 * @param usec Number of microseconds to sleep.
522
 *
523
 */
1780 jermar 524
void thread_usleep(uint32_t usec)
1 jermar 525
{
526
    waitq_t wq;
527
 
528
    waitq_initialize(&wq);
529
 
1502 jermar 530
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
1 jermar 531
}
532
 
107 decky 533
/** Register thread out-of-context invocation
534
 *
535
 * Register a function and its argument to be executed
536
 * on next context switch to the current thread.
537
 *
538
 * @param call_me      Out-of-context function.
539
 * @param call_me_with Out-of-context function argument.
540
 *
541
 */
1 jermar 542
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
543
{
413 jermar 544
    ipl_t ipl;
1 jermar 545
 
413 jermar 546
    ipl = interrupts_disable();
15 jermar 547
    spinlock_lock(&THREAD->lock);
548
    THREAD->call_me = call_me;
549
    THREAD->call_me_with = call_me_with;
550
    spinlock_unlock(&THREAD->lock);
413 jermar 551
    interrupts_restore(ipl);
1 jermar 552
}
777 palkovsky 553
 
554
/** Print list of threads debug info */
555
void thread_print_list(void)
556
{
557
    link_t *cur;
558
    ipl_t ipl;
559
 
560
    /* Messing with thread structures, avoid deadlock */
561
    ipl = interrupts_disable();
562
    spinlock_lock(&threads_lock);
2030 decky 563
 
2087 jermar 564
    printf("tid    name       address    state    task       ctx code    "
565
        "   stack      cycles     cpu  kstack     waitqueue\n");
566
    printf("------ ---------- ---------- -------- ---------- --- --------"
567
        "-- ---------- ---------- ---- ---------- ----------\n");
777 palkovsky 568
 
2087 jermar 569
    for (cur = threads_btree.leaf_head.next;
570
        cur != &threads_btree.leaf_head; cur = cur->next) {
1158 jermar 571
        btree_node_t *node;
2118 decky 572
        unsigned int i;
1158 jermar 573
 
574
        node = list_get_instance(cur, btree_node_t, leaf_link);
575
        for (i = 0; i < node->keys; i++) {
576
            thread_t *t;
577
 
578
            t = (thread_t *) node->value[i];
2030 decky 579
 
580
            uint64_t cycles;
581
            char suffix;
2050 decky 582
            order(t->cycles, &cycles, &suffix);
2030 decky 583
 
2216 decky 584
            printf("%-6llu %-10s %#10zx %-8s %#10zx %-3ld %#10zx "
2087 jermar 585
                "%#10zx %9llu%c ", t->tid, t->name, t,
586
                thread_states[t->state], t->task, t->task->context,
587
                t->thread_code, t->kstack, cycles, suffix);
2030 decky 588
 
1158 jermar 589
            if (t->cpu)
2030 decky 590
                printf("%-4zd", t->cpu->id);
1158 jermar 591
            else
592
                printf("none");
2030 decky 593
 
594
            if (t->state == Sleeping)
2087 jermar 595
                printf(" %#10zx %#10zx", t->kstack,
596
                    t->sleep_queue);
2030 decky 597
 
1158 jermar 598
            printf("\n");
599
        }
777 palkovsky 600
    }
601
 
602
    spinlock_unlock(&threads_lock);
1060 palkovsky 603
    interrupts_restore(ipl);
777 palkovsky 604
}
1066 jermar 605
 
1158 jermar 606
/** Check whether thread exists.
607
 *
608
 * Note that threads_lock must be already held and
609
 * interrupts must be already disabled.
610
 *
611
 * @param t Pointer to thread.
612
 *
613
 * @return True if thread t is known to the system, false otherwise.
614
 */
615
bool thread_exists(thread_t *t)
616
{
617
    btree_node_t *leaf;
618
 
2087 jermar 619
    return btree_search(&threads_btree, (btree_key_t) ((uintptr_t) t),
620
        &leaf) != NULL;
1158 jermar 621
}
622
 
2030 decky 623
 
624
/** Update accounting of current thread.
625
 *
626
 * Note that thread_lock on THREAD must be already held and
627
 * interrupts must be already disabled.
628
 *
629
 */
630
void thread_update_accounting(void)
631
{
632
    uint64_t time = get_cycle();
633
    THREAD->cycles += time - THREAD->last_cycle;
634
    THREAD->last_cycle = time;
635
}
636
 
1066 jermar 637
/** Process syscall to create new thread.
638
 *
639
 */
2216 decky 640
unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name, thread_id_t *uspace_thread_id)
1066 jermar 641
{
1210 vana 642
    thread_t *t;
643
    char namebuf[THREAD_NAME_BUFLEN];
1103 jermar 644
    uspace_arg_t *kernel_uarg;
1288 jermar 645
    int rc;
1066 jermar 646
 
1288 jermar 647
    rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
648
    if (rc != 0)
1780 jermar 649
        return (unative_t) rc;
1066 jermar 650
 
1078 jermar 651
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
1288 jermar 652
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
653
    if (rc != 0) {
654
        free(kernel_uarg);
1780 jermar 655
        return (unative_t) rc;
1288 jermar 656
    }
1078 jermar 657
 
2087 jermar 658
    t = thread_create(uinit, kernel_uarg, TASK, THREAD_FLAG_USPACE, namebuf,
659
        false);
660
    if (t) {
1210 vana 661
        thread_ready(t);
2216 decky 662
        if (uspace_thread_id != NULL)
663
            return (unative_t) copy_to_uspace(uspace_thread_id, &t->tid,
2229 jermar 664
                sizeof(t->tid));
2216 decky 665
        else
666
            return 0;
667
    } else
1078 jermar 668
        free(kernel_uarg);
1066 jermar 669
 
1780 jermar 670
    return (unative_t) ENOMEM;
1066 jermar 671
}
672
 
673
/** Process syscall to terminate thread.
674
 *
675
 */
1780 jermar 676
unative_t sys_thread_exit(int uspace_status)
1066 jermar 677
{
1210 vana 678
    thread_exit();
679
    /* Unreachable */
680
    return 0;
1066 jermar 681
}
1702 cejka 682
 
2187 decky 683
/** Syscall for getting TID.
684
 *
2216 decky 685
 * @param uspace_thread_id Userspace address of 8-byte buffer where to store
686
 * current thread ID.
687
 *
688
 * @return 0 on success or an error code from @ref errno.h.
2187 decky 689
 */
2216 decky 690
unative_t sys_thread_get_id(thread_id_t *uspace_thread_id)
2187 decky 691
{
692
    /*
693
     * No need to acquire lock on THREAD because tid
694
     * remains constant for the lifespan of the thread.
695
     */
2216 decky 696
    return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid,
697
        sizeof(THREAD->tid));
2187 decky 698
}
699
 
1757 jermar 700
/** @}
1702 cejka 701
 */