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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>
2502 jermar 54
#include <adt/avl.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
 
3424 svoboda 72
#ifndef LOADED_PROG_STACK_PAGES_NO
73
#define LOADED_PROG_STACK_PAGES_NO 1
74
#endif
75
 
76
 
1571 jermar 77
/** Thread states */
78
char *thread_states[] = {
79
    "Invalid",
80
    "Running",
81
    "Sleeping",
82
    "Ready",
83
    "Entering",
84
    "Exiting",
2451 jermar 85
    "Lingering"
1571 jermar 86
};
87
 
2502 jermar 88
/** Lock protecting the threads_tree AVL tree.
2067 jermar 89
 *
90
 * For locking rules, see declaration thereof.
91
 */
1158 jermar 92
SPINLOCK_INITIALIZE(threads_lock);
1 jermar 93
 
2925 svoboda 94
/** AVL tree of all threads.
1636 jermar 95
 *
2502 jermar 96
 * When a thread is found in the threads_tree AVL tree, it is guaranteed to
2067 jermar 97
 * exist as long as the threads_lock is held.
1636 jermar 98
 */
2502 jermar 99
avltree_t threads_tree;    
1636 jermar 100
 
623 jermar 101
SPINLOCK_INITIALIZE(tidlock);
2216 decky 102
thread_id_t last_tid = 0;
1 jermar 103
 
787 palkovsky 104
static slab_cache_t *thread_slab;
906 palkovsky 105
#ifdef ARCH_HAS_FPU
106
slab_cache_t *fpu_context_slab;
107
#endif
107 decky 108
 
2067 jermar 109
/** Thread wrapper.
107 decky 110
 *
2067 jermar 111
 * This wrapper is provided to ensure that every thread makes a call to
112
 * thread_exit() when its implementing function returns.
1 jermar 113
 *
413 jermar 114
 * interrupts_disable() is assumed.
107 decky 115
 *
1 jermar 116
 */
452 decky 117
static void cushion(void)
1 jermar 118
{
15 jermar 119
    void (*f)(void *) = THREAD->thread_code;
120
    void *arg = THREAD->thread_arg;
2032 decky 121
    THREAD->last_cycle = get_cycle();
1 jermar 122
 
2039 decky 123
    /* This is where each thread wakes up after its creation */
15 jermar 124
    spinlock_unlock(&THREAD->lock);
413 jermar 125
    interrupts_enable();
1 jermar 126
 
127
    f(arg);
2039 decky 128
 
129
    /* Accumulate accounting to the task */
130
    ipl_t ipl = interrupts_disable();
131
 
132
    spinlock_lock(&THREAD->lock);
2042 decky 133
    if (!THREAD->uncounted) {
134
        thread_update_accounting();
135
        uint64_t cycles = THREAD->cycles;
136
        THREAD->cycles = 0;
137
        spinlock_unlock(&THREAD->lock);
138
 
139
        spinlock_lock(&TASK->lock);
140
        TASK->cycles += cycles;
141
        spinlock_unlock(&TASK->lock);
142
    } else
143
        spinlock_unlock(&THREAD->lock);
2039 decky 144
 
145
    interrupts_restore(ipl);
146
 
1 jermar 147
    thread_exit();
148
    /* not reached */
149
}
150
 
787 palkovsky 151
/** Initialization and allocation for thread_t structure */
152
static int thr_constructor(void *obj, int kmflags)
153
{
1820 decky 154
    thread_t *t = (thread_t *) obj;
107 decky 155
 
787 palkovsky 156
    spinlock_initialize(&t->lock, "thread_t_lock");
157
    link_initialize(&t->rq_link);
158
    link_initialize(&t->wq_link);
159
    link_initialize(&t->th_link);
1854 jermar 160
 
161
    /* call the architecture-specific part of the constructor */
162
    thr_constructor_arch(t);
787 palkovsky 163
 
906 palkovsky 164
#ifdef ARCH_HAS_FPU
2440 jermar 165
#ifdef CONFIG_FPU_LAZY
906 palkovsky 166
    t->saved_fpu_context = NULL;
2440 jermar 167
#else
168
    t->saved_fpu_context = slab_alloc(fpu_context_slab, kmflags);
906 palkovsky 169
    if (!t->saved_fpu_context)
170
        return -1;
2440 jermar 171
#endif
906 palkovsky 172
#endif  
173
 
2118 decky 174
    t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags);
2440 jermar 175
    if (!t->kstack) {
906 palkovsky 176
#ifdef ARCH_HAS_FPU
177
        if (t->saved_fpu_context)
2440 jermar 178
            slab_free(fpu_context_slab, t->saved_fpu_context);
906 palkovsky 179
#endif
842 palkovsky 180
        return -1;
906 palkovsky 181
    }
787 palkovsky 182
 
3431 svoboda 183
#ifdef CONFIG_UDEBUG
3426 svoboda 184
    mutex_initialize(&t->udebug.lock, MUTEX_PASSIVE);
3431 svoboda 185
#endif
2848 svoboda 186
 
787 palkovsky 187
    return 0;
188
}
189
 
190
/** Destruction of thread_t object */
191
static int thr_destructor(void *obj)
192
{
1820 decky 193
    thread_t *t = (thread_t *) obj;
787 palkovsky 194
 
1854 jermar 195
    /* call the architecture-specific part of the destructor */
196
    thr_destructor_arch(t);
197
 
1760 palkovsky 198
    frame_free(KA2PA(t->kstack));
906 palkovsky 199
#ifdef ARCH_HAS_FPU
200
    if (t->saved_fpu_context)
2440 jermar 201
        slab_free(fpu_context_slab, t->saved_fpu_context);
906 palkovsky 202
#endif
787 palkovsky 203
    return 1; /* One page freed */
204
}
205
 
107 decky 206
/** Initialize threads
207
 *
208
 * Initialize kernel threads support.
209
 *
210
 */
1 jermar 211
void thread_init(void)
212
{
15 jermar 213
    THREAD = NULL;
625 palkovsky 214
    atomic_set(&nrdy,0);
2067 jermar 215
    thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
2087 jermar 216
        thr_constructor, thr_destructor, 0);
2067 jermar 217
 
906 palkovsky 218
#ifdef ARCH_HAS_FPU
2067 jermar 219
    fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
2087 jermar 220
        FPU_CONTEXT_ALIGN, NULL, NULL, 0);
906 palkovsky 221
#endif
1158 jermar 222
 
2502 jermar 223
    avltree_create(&threads_tree);
1 jermar 224
}
225
 
107 decky 226
/** Make thread ready
227
 *
228
 * Switch thread t to the ready state.
229
 *
230
 * @param t Thread to make ready.
231
 *
232
 */
1 jermar 233
void thread_ready(thread_t *t)
234
{
235
    cpu_t *cpu;
236
    runq_t *r;
413 jermar 237
    ipl_t ipl;
625 palkovsky 238
    int i, avg;
1 jermar 239
 
413 jermar 240
    ipl = interrupts_disable();
1 jermar 241
 
242
    spinlock_lock(&t->lock);
243
 
2440 jermar 244
    ASSERT(!(t->state == Ready));
1086 palkovsky 245
 
2067 jermar 246
    i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;
1 jermar 247
 
16 jermar 248
    cpu = CPU;
1854 jermar 249
    if (t->flags & THREAD_FLAG_WIRED) {
2268 jermar 250
        ASSERT(t->cpu != NULL);
1 jermar 251
        cpu = t->cpu;
252
    }
1083 palkovsky 253
    t->state = Ready;
1 jermar 254
    spinlock_unlock(&t->lock);
255
 
107 decky 256
    /*
1 jermar 257
     * Append t to respective ready queue on respective processor.
258
     */
259
    r = &cpu->rq[i];
260
    spinlock_lock(&r->lock);
261
    list_append(&t->rq_link, &r->rq_head);
262
    r->n++;
263
    spinlock_unlock(&r->lock);
264
 
475 jermar 265
    atomic_inc(&nrdy);
625 palkovsky 266
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 267
    atomic_inc(&cpu->nrdy);
1 jermar 268
 
413 jermar 269
    interrupts_restore(ipl);
1 jermar 270
}
271
 
107 decky 272
/** Create new thread
273
 *
274
 * Create a new thread.
275
 *
2925 svoboda 276
 * @param func      Thread's implementing function.
277
 * @param arg       Thread's implementing function argument.
278
 * @param task      Task to which the thread belongs. The caller must
279
 *          guarantee that the task won't cease to exist during the
280
 *          call. The task's lock may not be held.
281
 * @param flags     Thread flags.
282
 * @param name      Symbolic name.
283
 * @param uncounted Thread's accounting doesn't affect accumulated task
284
 *          accounting.
107 decky 285
 *
2925 svoboda 286
 * @return      New thread's structure on success, NULL on failure.
107 decky 287
 *
288
 */
2067 jermar 289
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
2436 jermar 290
    int flags, char *name, bool uncounted)
1 jermar 291
{
292
    thread_t *t;
822 palkovsky 293
    ipl_t ipl;
294
 
787 palkovsky 295
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 296
    if (!t)
297
        return NULL;
1 jermar 298
 
822 palkovsky 299
    /* Not needed, but good for debugging */
3424 svoboda 300
    memsetb(t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES, 0);
822 palkovsky 301
 
302
    ipl = interrupts_disable();
303
    spinlock_lock(&tidlock);
304
    t->tid = ++last_tid;
305
    spinlock_unlock(&tidlock);
306
    interrupts_restore(ipl);
307
 
308
    context_save(&t->saved_context);
2067 jermar 309
    context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
2087 jermar 310
        THREAD_STACK_SIZE);
822 palkovsky 311
 
312
    the_initialize((the_t *) t->kstack);
313
 
314
    ipl = interrupts_disable();
315
    t->saved_context.ipl = interrupts_read();
316
    interrupts_restore(ipl);
317
 
1066 jermar 318
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
319
 
822 palkovsky 320
    t->thread_code = func;
321
    t->thread_arg = arg;
322
    t->ticks = -1;
2030 decky 323
    t->cycles = 0;
2042 decky 324
    t->uncounted = uncounted;
822 palkovsky 325
    t->priority = -1;       /* start in rq[0] */
326
    t->cpu = NULL;
1854 jermar 327
    t->flags = flags;
822 palkovsky 328
    t->state = Entering;
329
    t->call_me = NULL;
330
    t->call_me_with = NULL;
331
 
332
    timeout_initialize(&t->sleep_timeout);
1502 jermar 333
    t->sleep_interruptible = false;
822 palkovsky 334
    t->sleep_queue = NULL;
335
    t->timeout_pending = 0;
1288 jermar 336
 
337
    t->in_copy_from_uspace = false;
338
    t->in_copy_to_uspace = false;
1579 jermar 339
 
340
    t->interrupted = false;
1571 jermar 341
    t->detached = false;
342
    waitq_initialize(&t->join_wq);
343
 
822 palkovsky 344
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 345
 
822 palkovsky 346
    t->task = task;
347
 
860 decky 348
    t->fpu_context_exists = 0;
349
    t->fpu_context_engaged = 0;
1854 jermar 350
 
2502 jermar 351
    avltree_node_initialize(&t->threads_tree_node);
352
    t->threads_tree_node.key = (uintptr_t) t;
3431 svoboda 353
 
354
#ifdef CONFIG_UDEBUG
2817 svoboda 355
    /* Init debugging stuff */
3018 svoboda 356
    udebug_thread_initialize(&t->udebug);
3431 svoboda 357
#endif
2502 jermar 358
 
2067 jermar 359
    /* might depend on previous initialization */
2799 svoboda 360
    thread_create_arch(t); 
2440 jermar 361
 
362
    if (!(flags & THREAD_FLAG_NOATTACH))
363
        thread_attach(t, task);
364
 
365
    return t;
366
}
367
 
368
/** Destroy thread memory structure
369
 *
370
 * Detach thread from all queues, cpus etc. and destroy it.
371
 *
372
 * Assume thread->lock is held!!
373
 */
374
void thread_destroy(thread_t *t)
375
{
2451 jermar 376
    ASSERT(t->state == Exiting || t->state == Lingering);
2440 jermar 377
    ASSERT(t->task);
378
    ASSERT(t->cpu);
379
 
380
    spinlock_lock(&t->cpu->lock);
381
    if (t->cpu->fpu_owner == t)
382
        t->cpu->fpu_owner = NULL;
383
    spinlock_unlock(&t->cpu->lock);
384
 
385
    spinlock_unlock(&t->lock);
386
 
387
    spinlock_lock(&threads_lock);
2502 jermar 388
    avltree_delete(&threads_tree, &t->threads_tree_node);
2440 jermar 389
    spinlock_unlock(&threads_lock);
390
 
391
    /*
392
     * Detach from the containing task.
393
     */
394
    spinlock_lock(&t->task->lock);
395
    list_remove(&t->th_link);
396
    spinlock_unlock(&t->task->lock);   
2446 jermar 397
 
398
    /*
399
     * t is guaranteed to be the very last thread of its task.
400
     * It is safe to destroy the task.
401
     */
402
    if (atomic_predec(&t->task->refcount) == 0)
2440 jermar 403
        task_destroy(t->task);
404
 
405
    slab_free(thread_slab, t);
406
}
407
 
408
/** Make the thread visible to the system.
409
 *
410
 * Attach the thread structure to the current task and make it visible in the
2502 jermar 411
 * threads_tree.
2440 jermar 412
 *
413
 * @param t Thread to be attached to the task.
414
 * @param task  Task to which the thread is to be attached.
415
 */
416
void thread_attach(thread_t *t, task_t *task)
417
{
418
    ipl_t ipl;
419
 
420
    /*
2902 svoboda 421
     * Attach to the specified task.
2440 jermar 422
     */
2446 jermar 423
    ipl = interrupts_disable();
2440 jermar 424
    spinlock_lock(&task->lock);
3431 svoboda 425
 
2902 svoboda 426
    atomic_inc(&task->refcount);
3431 svoboda 427
 
2902 svoboda 428
    /* Must not count kbox thread into lifecount */
429
    if (t->flags & THREAD_FLAG_USPACE)
430
        atomic_inc(&task->lifecount);
3431 svoboda 431
 
2902 svoboda 432
    list_append(&t->th_link, &task->th_head);
1579 jermar 433
    spinlock_unlock(&task->lock);
434
 
435
    /*
822 palkovsky 436
     * Register this thread in the system-wide list.
437
     */
2902 svoboda 438
    spinlock_lock(&threads_lock);
439
    avltree_insert(&threads_tree, &t->threads_tree_node);
440
    spinlock_unlock(&threads_lock);
822 palkovsky 441
 
442
    interrupts_restore(ipl);
1 jermar 443
}
444
 
1687 jermar 445
/** Terminate thread.
107 decky 446
 *
2067 jermar 447
 * End current thread execution and switch it to the exiting state. All pending
448
 * timeouts are executed.
107 decky 449
 */
1 jermar 450
void thread_exit(void)
451
{
413 jermar 452
    ipl_t ipl;
1 jermar 453
 
2902 svoboda 454
    if (THREAD->flags & THREAD_FLAG_USPACE) {
3431 svoboda 455
#ifdef CONFIG_UDEBUG
2903 svoboda 456
        /* Generate udebug THREAD_E event */
457
        udebug_thread_e_event();
3431 svoboda 458
#endif
2902 svoboda 459
        if (atomic_predec(&TASK->lifecount) == 0) {
460
            /*
461
             * We are the last userspace thread in the task that
462
             * still has not exited. With the exception of the
463
             * moment the task was created, new userspace threads
464
             * can only be created by threads of the same task.
465
             * We are safe to perform cleanup.
466
             */
2446 jermar 467
            ipc_cleanup();
3424 svoboda 468
            futex_cleanup();
469
            LOG("Cleanup of task %" PRIu64" completed.", TASK->taskid);
2446 jermar 470
        }
471
    }
472
 
1 jermar 473
restart:
413 jermar 474
    ipl = interrupts_disable();
15 jermar 475
    spinlock_lock(&THREAD->lock);
2067 jermar 476
    if (THREAD->timeout_pending) {
477
        /* busy waiting for timeouts in progress */
15 jermar 478
        spinlock_unlock(&THREAD->lock);
413 jermar 479
        interrupts_restore(ipl);
1 jermar 480
        goto restart;
481
    }
2446 jermar 482
 
15 jermar 483
    THREAD->state = Exiting;
484
    spinlock_unlock(&THREAD->lock);
1 jermar 485
    scheduler();
1595 palkovsky 486
 
487
    /* Not reached */
488
    while (1)
489
        ;
1 jermar 490
}
491
 
107 decky 492
 
493
/** Thread sleep
494
 *
495
 * Suspend execution of the current thread.
496
 *
497
 * @param sec Number of seconds to sleep.
498
 *
499
 */
1780 jermar 500
void thread_sleep(uint32_t sec)
1 jermar 501
{
2067 jermar 502
    thread_usleep(sec * 1000000);
1 jermar 503
}
107 decky 504
 
1571 jermar 505
/** Wait for another thread to exit.
506
 *
507
 * @param t Thread to join on exit.
508
 * @param usec Timeout in microseconds.
509
 * @param flags Mode of operation.
510
 *
511
 * @return An error code from errno.h or an error code from synch.h.
512
 */
1780 jermar 513
int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
1571 jermar 514
{
515
    ipl_t ipl;
516
    int rc;
517
 
518
    if (t == THREAD)
519
        return EINVAL;
520
 
521
    /*
522
     * Since thread join can only be called once on an undetached thread,
523
     * the thread pointer is guaranteed to be still valid.
524
     */
525
 
526
    ipl = interrupts_disable();
527
    spinlock_lock(&t->lock);
528
    ASSERT(!t->detached);
529
    spinlock_unlock(&t->lock);
1687 jermar 530
    interrupts_restore(ipl);
1571 jermar 531
 
1687 jermar 532
    rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
1571 jermar 533
 
534
    return rc; 
535
}
536
 
537
/** Detach thread.
538
 *
2451 jermar 539
 * Mark the thread as detached, if the thread is already in the Lingering
540
 * state, deallocate its resources.
1571 jermar 541
 *
542
 * @param t Thread to be detached.
543
 */
544
void thread_detach(thread_t *t)
545
{
546
    ipl_t ipl;
547
 
548
    /*
2183 jermar 549
     * Since the thread is expected not to be already detached,
1571 jermar 550
     * pointer to it must be still valid.
551
     */
552
    ipl = interrupts_disable();
553
    spinlock_lock(&t->lock);
554
    ASSERT(!t->detached);
2451 jermar 555
    if (t->state == Lingering) {
1571 jermar 556
        thread_destroy(t);  /* unlocks &t->lock */
557
        interrupts_restore(ipl);
558
        return;
559
    } else {
560
        t->detached = true;
561
    }
562
    spinlock_unlock(&t->lock);
563
    interrupts_restore(ipl);
564
}
565
 
107 decky 566
/** Thread usleep
567
 *
568
 * Suspend execution of the current thread.
569
 *
570
 * @param usec Number of microseconds to sleep.
571
 *
572
 */
1780 jermar 573
void thread_usleep(uint32_t usec)
1 jermar 574
{
575
    waitq_t wq;
576
 
577
    waitq_initialize(&wq);
578
 
1502 jermar 579
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
1 jermar 580
}
581
 
107 decky 582
/** Register thread out-of-context invocation
583
 *
584
 * Register a function and its argument to be executed
585
 * on next context switch to the current thread.
586
 *
587
 * @param call_me      Out-of-context function.
588
 * @param call_me_with Out-of-context function argument.
589
 *
590
 */
1 jermar 591
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
592
{
413 jermar 593
    ipl_t ipl;
1 jermar 594
 
413 jermar 595
    ipl = interrupts_disable();
15 jermar 596
    spinlock_lock(&THREAD->lock);
597
    THREAD->call_me = call_me;
598
    THREAD->call_me_with = call_me_with;
599
    spinlock_unlock(&THREAD->lock);
413 jermar 600
    interrupts_restore(ipl);
1 jermar 601
}
777 palkovsky 602
 
2504 jermar 603
static bool thread_walker(avltree_node_t *node, void *arg)
2502 jermar 604
{
3424 svoboda 605
    thread_t *t = avltree_get_instance(node, thread_t, threads_tree_node);
606
 
2502 jermar 607
    uint64_t cycles;
608
    char suffix;
609
    order(t->cycles, &cycles, &suffix);
3424 svoboda 610
 
611
#ifdef __32_BITS__
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,
614
        t->task->context, t->thread_code, t->kstack, cycles, suffix);
615
#endif
616
 
617
#ifdef __64_BITS__
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,
620
        t->task->context, t->thread_code, t->kstack, cycles, suffix);
621
#endif
2502 jermar 622
 
623
    if (t->cpu)
3424 svoboda 624
        printf("%-4u", t->cpu->id);
2502 jermar 625
    else
626
        printf("none");
627
 
2712 decky 628
    if (t->state == Sleeping) {
3424 svoboda 629
#ifdef __32_BITS__
630
        printf(" %10p", t->sleep_queue);
631
#endif
632
 
633
#ifdef __64_BITS__
634
        printf(" %18p", t->sleep_queue);
635
#endif
2712 decky 636
    }
2502 jermar 637
 
638
    printf("\n");
2504 jermar 639
 
640
    return true;
2502 jermar 641
}
642
 
777 palkovsky 643
/** Print list of threads debug info */
644
void thread_print_list(void)
645
{
646
    ipl_t ipl;
647
 
648
    /* Messing with thread structures, avoid deadlock */
649
    ipl = interrupts_disable();
650
    spinlock_lock(&threads_lock);
651
 
3424 svoboda 652
#ifdef __32_BITS__  
653
    printf("tid    name       address    state    task       "
654
        "ctx code       stack      cycles     cpu  "
655
        "waitqueue\n");
656
    printf("------ ---------- ---------- -------- ---------- "
657
        "--- ---------- ---------- ---------- ---- "
658
        "----------\n");
659
#endif
660
 
661
#ifdef __64_BITS__
662
    printf("tid    name       address            state    task               "
663
        "ctx code               stack              cycles     cpu  "
664
        "waitqueue\n");
665
    printf("------ ---------- ------------------ -------- ------------------ "
666
        "--- ------------------ ------------------ ---------- ---- "
667
        "------------------\n");
668
#endif
669
 
2504 jermar 670
    avltree_walk(&threads_tree, thread_walker, NULL);
1158 jermar 671
 
777 palkovsky 672
    spinlock_unlock(&threads_lock);
1060 palkovsky 673
    interrupts_restore(ipl);
777 palkovsky 674
}
1066 jermar 675
 
1158 jermar 676
/** Check whether thread exists.
677
 *
678
 * Note that threads_lock must be already held and
679
 * interrupts must be already disabled.
680
 *
681
 * @param t Pointer to thread.
682
 *
683
 * @return True if thread t is known to the system, false otherwise.
684
 */
685
bool thread_exists(thread_t *t)
686
{
2502 jermar 687
    avltree_node_t *node;
688
 
689
    node = avltree_search(&threads_tree, (avltree_key_t) ((uintptr_t) t));
1158 jermar 690
 
2502 jermar 691
    return node != NULL;
1158 jermar 692
}
693
 
2030 decky 694
/** Update accounting of current thread.
695
 *
696
 * Note that thread_lock on THREAD must be already held and
697
 * interrupts must be already disabled.
698
 *
699
 */
700
void thread_update_accounting(void)
701
{
702
    uint64_t time = get_cycle();
703
    THREAD->cycles += time - THREAD->last_cycle;
704
    THREAD->last_cycle = time;
705
}
706
 
1066 jermar 707
/** Process syscall to create new thread.
708
 *
709
 */
2436 jermar 710
unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name,
711
    thread_id_t *uspace_thread_id)
1066 jermar 712
{
1210 vana 713
    thread_t *t;
714
    char namebuf[THREAD_NAME_BUFLEN];
1103 jermar 715
    uspace_arg_t *kernel_uarg;
1288 jermar 716
    int rc;
1066 jermar 717
 
1288 jermar 718
    rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
719
    if (rc != 0)
1780 jermar 720
        return (unative_t) rc;
1066 jermar 721
 
2470 jermar 722
    /*
723
     * In case of failure, kernel_uarg will be deallocated in this function.
724
     * In case of success, kernel_uarg will be freed in uinit().
725
     */
726
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
727
 
1288 jermar 728
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
729
    if (rc != 0) {
730
        free(kernel_uarg);
1780 jermar 731
        return (unative_t) rc;
1288 jermar 732
    }
1078 jermar 733
 
2440 jermar 734
    t = thread_create(uinit, kernel_uarg, TASK,
735
        THREAD_FLAG_USPACE | THREAD_FLAG_NOATTACH, namebuf, false);
2087 jermar 736
    if (t) {
2440 jermar 737
        if (uspace_thread_id != NULL) {
738
            int rc;
739
 
740
            rc = copy_to_uspace(uspace_thread_id, &t->tid,
741
                sizeof(t->tid));
742
            if (rc != 0) {
743
                /*
744
                 * We have encountered a failure, but the thread
745
                 * has already been created. We need to undo its
746
                 * creation now.
747
                 */
748
 
749
                /*
2446 jermar 750
                 * The new thread structure is initialized, but
751
                 * is still not visible to the system.
2440 jermar 752
                 * We can safely deallocate it.
753
                 */
754
                slab_free(thread_slab, t);
755
                free(kernel_uarg);
756
 
757
                return (unative_t) rc;
758
             }
759
        }
760
        thread_attach(t, TASK);
1210 vana 761
        thread_ready(t);
2440 jermar 762
 
3431 svoboda 763
#ifdef CONFIG_UDEBUG
2903 svoboda 764
        /* Generate udebug THREAD_B event */
765
        udebug_thread_b_event(t);
3431 svoboda 766
#endif
2867 svoboda 767
 
2440 jermar 768
        return 0;
2216 decky 769
    } else
1078 jermar 770
        free(kernel_uarg);
1066 jermar 771
 
1780 jermar 772
    return (unative_t) ENOMEM;
1066 jermar 773
}
774
 
775
/** Process syscall to terminate thread.
776
 *
777
 */
1780 jermar 778
unative_t sys_thread_exit(int uspace_status)
1066 jermar 779
{
1210 vana 780
    thread_exit();
781
    /* Unreachable */
782
    return 0;
1066 jermar 783
}
1702 cejka 784
 
2187 decky 785
/** Syscall for getting TID.
786
 *
2216 decky 787
 * @param uspace_thread_id Userspace address of 8-byte buffer where to store
788
 * current thread ID.
789
 *
790
 * @return 0 on success or an error code from @ref errno.h.
2187 decky 791
 */
2216 decky 792
unative_t sys_thread_get_id(thread_id_t *uspace_thread_id)
2187 decky 793
{
794
    /*
795
     * No need to acquire lock on THREAD because tid
796
     * remains constant for the lifespan of the thread.
797
     */
2216 decky 798
    return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid,
799
        sizeof(THREAD->tid));
2187 decky 800
}
801
 
1757 jermar 802
/** @}
1702 cejka 803
 */