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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
 
3063 decky 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
 
2790 jermar 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
 
3492 rimsky 183
#ifdef CONFIG_UDEBUG
184
    mutex_initialize(&t->udebug.lock, MUTEX_PASSIVE);
185
#endif
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;
3745 rimsky 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);
4679 rimsky 268
    if (cpu->arch.exec_unit)
269
        atomic_inc(&(cpu->arch.exec_unit->nrdy));
1 jermar 270
 
413 jermar 271
    interrupts_restore(ipl);
1 jermar 272
}
273
 
107 decky 274
/** Create new thread
275
 *
276
 * Create a new thread.
277
 *
2907 jermar 278
 * @param func      Thread's implementing function.
279
 * @param arg       Thread's implementing function argument.
280
 * @param task      Task to which the thread belongs. The caller must
281
 *          guarantee that the task won't cease to exist during the
282
 *          call. The task's lock may not be held.
283
 * @param flags     Thread flags.
3593 rimsky 284
 * @param name      Symbolic name (a copy is made).
2907 jermar 285
 * @param uncounted Thread's accounting doesn't affect accumulated task
286
 *          accounting.
107 decky 287
 *
2907 jermar 288
 * @return      New thread's structure on success, NULL on failure.
107 decky 289
 *
290
 */
2067 jermar 291
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
2436 jermar 292
    int flags, char *name, bool uncounted)
1 jermar 293
{
294
    thread_t *t;
822 palkovsky 295
    ipl_t ipl;
296
 
787 palkovsky 297
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 298
    if (!t)
299
        return NULL;
1 jermar 300
 
822 palkovsky 301
    /* Not needed, but good for debugging */
3104 svoboda 302
    memsetb(t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES, 0);
822 palkovsky 303
 
304
    ipl = interrupts_disable();
305
    spinlock_lock(&tidlock);
306
    t->tid = ++last_tid;
307
    spinlock_unlock(&tidlock);
308
    interrupts_restore(ipl);
309
 
310
    context_save(&t->saved_context);
2067 jermar 311
    context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
2087 jermar 312
        THREAD_STACK_SIZE);
822 palkovsky 313
 
314
    the_initialize((the_t *) t->kstack);
315
 
316
    ipl = interrupts_disable();
317
    t->saved_context.ipl = interrupts_read();
318
    interrupts_restore(ipl);
319
 
1066 jermar 320
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
3593 rimsky 321
    t->name[THREAD_NAME_BUFLEN - 1] = '\0';
1066 jermar 322
 
822 palkovsky 323
    t->thread_code = func;
324
    t->thread_arg = arg;
325
    t->ticks = -1;
2030 decky 326
    t->cycles = 0;
2042 decky 327
    t->uncounted = uncounted;
822 palkovsky 328
    t->priority = -1;       /* start in rq[0] */
329
    t->cpu = NULL;
1854 jermar 330
    t->flags = flags;
822 palkovsky 331
    t->state = Entering;
332
    t->call_me = NULL;
333
    t->call_me_with = NULL;
334
 
335
    timeout_initialize(&t->sleep_timeout);
1502 jermar 336
    t->sleep_interruptible = false;
822 palkovsky 337
    t->sleep_queue = NULL;
338
    t->timeout_pending = 0;
1288 jermar 339
 
340
    t->in_copy_from_uspace = false;
341
    t->in_copy_to_uspace = false;
1579 jermar 342
 
343
    t->interrupted = false;
1571 jermar 344
    t->detached = false;
345
    waitq_initialize(&t->join_wq);
346
 
822 palkovsky 347
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 348
 
822 palkovsky 349
    t->task = task;
350
 
860 decky 351
    t->fpu_context_exists = 0;
352
    t->fpu_context_engaged = 0;
1854 jermar 353
 
2502 jermar 354
    avltree_node_initialize(&t->threads_tree_node);
355
    t->threads_tree_node.key = (uintptr_t) t;
356
 
3492 rimsky 357
#ifdef CONFIG_UDEBUG
358
    /* Init debugging stuff */
359
    udebug_thread_initialize(&t->udebug);
360
#endif
361
 
2067 jermar 362
    /* might depend on previous initialization */
363
    thread_create_arch(t); 
2440 jermar 364
 
365
    if (!(flags & THREAD_FLAG_NOATTACH))
366
        thread_attach(t, task);
367
 
368
    return t;
369
}
370
 
371
/** Destroy thread memory structure
372
 *
373
 * Detach thread from all queues, cpus etc. and destroy it.
374
 *
375
 * Assume thread->lock is held!!
376
 */
377
void thread_destroy(thread_t *t)
378
{
2451 jermar 379
    ASSERT(t->state == Exiting || t->state == Lingering);
2440 jermar 380
    ASSERT(t->task);
381
    ASSERT(t->cpu);
382
 
383
    spinlock_lock(&t->cpu->lock);
384
    if (t->cpu->fpu_owner == t)
385
        t->cpu->fpu_owner = NULL;
386
    spinlock_unlock(&t->cpu->lock);
387
 
388
    spinlock_unlock(&t->lock);
389
 
390
    spinlock_lock(&threads_lock);
2502 jermar 391
    avltree_delete(&threads_tree, &t->threads_tree_node);
2440 jermar 392
    spinlock_unlock(&threads_lock);
393
 
394
    /*
395
     * Detach from the containing task.
396
     */
397
    spinlock_lock(&t->task->lock);
398
    list_remove(&t->th_link);
399
    spinlock_unlock(&t->task->lock);   
2446 jermar 400
 
401
    /*
402
     * t is guaranteed to be the very last thread of its task.
403
     * It is safe to destroy the task.
404
     */
405
    if (atomic_predec(&t->task->refcount) == 0)
2440 jermar 406
        task_destroy(t->task);
407
 
408
    slab_free(thread_slab, t);
409
}
410
 
411
/** Make the thread visible to the system.
412
 *
413
 * Attach the thread structure to the current task and make it visible in the
2502 jermar 414
 * threads_tree.
2440 jermar 415
 *
416
 * @param t Thread to be attached to the task.
417
 * @param task  Task to which the thread is to be attached.
418
 */
419
void thread_attach(thread_t *t, task_t *task)
420
{
421
    ipl_t ipl;
422
 
423
    /*
3492 rimsky 424
     * Attach to the specified task.
2440 jermar 425
     */
2446 jermar 426
    ipl = interrupts_disable();
2440 jermar 427
    spinlock_lock(&task->lock);
3492 rimsky 428
 
2446 jermar 429
    atomic_inc(&task->refcount);
3492 rimsky 430
 
431
    /* Must not count kbox thread into lifecount */
432
    if (t->flags & THREAD_FLAG_USPACE)
433
        atomic_inc(&task->lifecount);
434
 
1579 jermar 435
    list_append(&t->th_link, &task->th_head);
436
    spinlock_unlock(&task->lock);
437
 
438
    /*
822 palkovsky 439
     * Register this thread in the system-wide list.
440
     */
441
    spinlock_lock(&threads_lock);
2502 jermar 442
    avltree_insert(&threads_tree, &t->threads_tree_node);
822 palkovsky 443
    spinlock_unlock(&threads_lock);
444
 
445
    interrupts_restore(ipl);
1 jermar 446
}
447
 
1687 jermar 448
/** Terminate thread.
107 decky 449
 *
2067 jermar 450
 * End current thread execution and switch it to the exiting state. All pending
451
 * timeouts are executed.
107 decky 452
 */
1 jermar 453
void thread_exit(void)
454
{
413 jermar 455
    ipl_t ipl;
1 jermar 456
 
3492 rimsky 457
    if (THREAD->flags & THREAD_FLAG_USPACE) {
458
#ifdef CONFIG_UDEBUG
459
        /* Generate udebug THREAD_E event */
460
        udebug_thread_e_event();
461
#endif
462
        if (atomic_predec(&TASK->lifecount) == 0) {
463
            /*
464
             * We are the last userspace thread in the task that
465
             * still has not exited. With the exception of the
466
             * moment the task was created, new userspace threads
467
             * can only be created by threads of the same task.
468
             * We are safe to perform cleanup.
469
             */
2446 jermar 470
            ipc_cleanup();
3063 decky 471
            futex_cleanup();
472
            LOG("Cleanup of task %" PRIu64" completed.", TASK->taskid);
2446 jermar 473
        }
474
    }
475
 
1 jermar 476
restart:
413 jermar 477
    ipl = interrupts_disable();
15 jermar 478
    spinlock_lock(&THREAD->lock);
2067 jermar 479
    if (THREAD->timeout_pending) {
480
        /* busy waiting for timeouts in progress */
15 jermar 481
        spinlock_unlock(&THREAD->lock);
413 jermar 482
        interrupts_restore(ipl);
1 jermar 483
        goto restart;
484
    }
2446 jermar 485
 
15 jermar 486
    THREAD->state = Exiting;
487
    spinlock_unlock(&THREAD->lock);
1 jermar 488
    scheduler();
3742 rimsky 489
 
1595 palkovsky 490
    /* Not reached */
491
    while (1)
492
        ;
1 jermar 493
}
494
 
107 decky 495
 
496
/** Thread sleep
497
 *
498
 * Suspend execution of the current thread.
499
 *
500
 * @param sec Number of seconds to sleep.
501
 *
502
 */
1780 jermar 503
void thread_sleep(uint32_t sec)
1 jermar 504
{
2067 jermar 505
    thread_usleep(sec * 1000000);
1 jermar 506
}
107 decky 507
 
1571 jermar 508
/** Wait for another thread to exit.
509
 *
510
 * @param t Thread to join on exit.
511
 * @param usec Timeout in microseconds.
512
 * @param flags Mode of operation.
513
 *
514
 * @return An error code from errno.h or an error code from synch.h.
515
 */
1780 jermar 516
int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
1571 jermar 517
{
518
    ipl_t ipl;
519
    int rc;
520
 
521
    if (t == THREAD)
522
        return EINVAL;
523
 
524
    /*
525
     * Since thread join can only be called once on an undetached thread,
526
     * the thread pointer is guaranteed to be still valid.
527
     */
528
 
529
    ipl = interrupts_disable();
530
    spinlock_lock(&t->lock);
531
    ASSERT(!t->detached);
532
    spinlock_unlock(&t->lock);
1687 jermar 533
    interrupts_restore(ipl);
1571 jermar 534
 
1687 jermar 535
    rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
1571 jermar 536
 
537
    return rc; 
538
}
539
 
540
/** Detach thread.
541
 *
2451 jermar 542
 * Mark the thread as detached, if the thread is already in the Lingering
543
 * state, deallocate its resources.
1571 jermar 544
 *
545
 * @param t Thread to be detached.
546
 */
547
void thread_detach(thread_t *t)
548
{
549
    ipl_t ipl;
550
 
551
    /*
2183 jermar 552
     * Since the thread is expected not to be already detached,
1571 jermar 553
     * pointer to it must be still valid.
554
     */
555
    ipl = interrupts_disable();
556
    spinlock_lock(&t->lock);
557
    ASSERT(!t->detached);
2451 jermar 558
    if (t->state == Lingering) {
1571 jermar 559
        thread_destroy(t);  /* unlocks &t->lock */
560
        interrupts_restore(ipl);
561
        return;
562
    } else {
563
        t->detached = true;
564
    }
565
    spinlock_unlock(&t->lock);
566
    interrupts_restore(ipl);
567
}
568
 
107 decky 569
/** Thread usleep
570
 *
571
 * Suspend execution of the current thread.
572
 *
573
 * @param usec Number of microseconds to sleep.
574
 *
575
 */
1780 jermar 576
void thread_usleep(uint32_t usec)
1 jermar 577
{
578
    waitq_t wq;
579
 
580
    waitq_initialize(&wq);
581
 
1502 jermar 582
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
1 jermar 583
}
584
 
107 decky 585
/** Register thread out-of-context invocation
586
 *
587
 * Register a function and its argument to be executed
588
 * on next context switch to the current thread.
589
 *
590
 * @param call_me      Out-of-context function.
591
 * @param call_me_with Out-of-context function argument.
592
 *
593
 */
1 jermar 594
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
595
{
413 jermar 596
    ipl_t ipl;
1 jermar 597
 
413 jermar 598
    ipl = interrupts_disable();
15 jermar 599
    spinlock_lock(&THREAD->lock);
600
    THREAD->call_me = call_me;
601
    THREAD->call_me_with = call_me_with;
602
    spinlock_unlock(&THREAD->lock);
413 jermar 603
    interrupts_restore(ipl);
1 jermar 604
}
777 palkovsky 605
 
2504 jermar 606
static bool thread_walker(avltree_node_t *node, void *arg)
2502 jermar 607
{
3063 decky 608
    thread_t *t = avltree_get_instance(node, thread_t, threads_tree_node);
609
 
2502 jermar 610
    uint64_t cycles;
611
    char suffix;
612
    order(t->cycles, &cycles, &suffix);
3063 decky 613
 
614
#ifdef __32_BITS__
615
    printf("%-6" PRIu64" %-10s %10p %-8s %10p %-3" PRIu32 " %10p %10p %9" PRIu64 "%c ",
616
        t->tid, t->name, t, thread_states[t->state], t->task,
617
        t->task->context, t->thread_code, t->kstack, cycles, suffix);
618
#endif
619
 
620
#ifdef __64_BITS__
621
    printf("%-6" PRIu64" %-10s %18p %-8s %18p %-3" PRIu32 " %18p %18p %9" PRIu64 "%c ",
622
        t->tid, t->name, t, thread_states[t->state], t->task,
623
        t->task->context, t->thread_code, t->kstack, cycles, suffix);
624
#endif
2502 jermar 625
 
626
    if (t->cpu)
3063 decky 627
        printf("%-4u", t->cpu->id);
2502 jermar 628
    else
629
        printf("none");
630
 
2712 decky 631
    if (t->state == Sleeping) {
3063 decky 632
#ifdef __32_BITS__
633
        printf(" %10p", t->sleep_queue);
634
#endif
635
 
636
#ifdef __64_BITS__
637
        printf(" %18p", t->sleep_queue);
638
#endif
2712 decky 639
    }
2502 jermar 640
 
641
    printf("\n");
2504 jermar 642
 
643
    return true;
2502 jermar 644
}
645
 
777 palkovsky 646
/** Print list of threads debug info */
647
void thread_print_list(void)
648
{
649
    ipl_t ipl;
650
 
651
    /* Messing with thread structures, avoid deadlock */
652
    ipl = interrupts_disable();
653
    spinlock_lock(&threads_lock);
654
 
3063 decky 655
#ifdef __32_BITS__  
656
    printf("tid    name       address    state    task       "
657
        "ctx code       stack      cycles     cpu  "
658
        "waitqueue\n");
659
    printf("------ ---------- ---------- -------- ---------- "
660
        "--- ---------- ---------- ---------- ---- "
661
        "----------\n");
662
#endif
663
 
664
#ifdef __64_BITS__
665
    printf("tid    name       address            state    task               "
666
        "ctx code               stack              cycles     cpu  "
667
        "waitqueue\n");
668
    printf("------ ---------- ------------------ -------- ------------------ "
669
        "--- ------------------ ------------------ ---------- ---- "
670
        "------------------\n");
671
#endif
672
 
2504 jermar 673
    avltree_walk(&threads_tree, thread_walker, NULL);
1158 jermar 674
 
777 palkovsky 675
    spinlock_unlock(&threads_lock);
1060 palkovsky 676
    interrupts_restore(ipl);
777 palkovsky 677
}
1066 jermar 678
 
1158 jermar 679
/** Check whether thread exists.
680
 *
681
 * Note that threads_lock must be already held and
682
 * interrupts must be already disabled.
683
 *
684
 * @param t Pointer to thread.
685
 *
686
 * @return True if thread t is known to the system, false otherwise.
687
 */
688
bool thread_exists(thread_t *t)
689
{
2502 jermar 690
    avltree_node_t *node;
691
 
692
    node = avltree_search(&threads_tree, (avltree_key_t) ((uintptr_t) t));
1158 jermar 693
 
2502 jermar 694
    return node != NULL;
1158 jermar 695
}
696
 
2030 decky 697
/** Update accounting of current thread.
698
 *
699
 * Note that thread_lock on THREAD must be already held and
700
 * interrupts must be already disabled.
701
 *
702
 */
703
void thread_update_accounting(void)
704
{
705
    uint64_t time = get_cycle();
706
    THREAD->cycles += time - THREAD->last_cycle;
707
    THREAD->last_cycle = time;
708
}
709
 
1066 jermar 710
/** Process syscall to create new thread.
711
 *
712
 */
2436 jermar 713
unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name,
3593 rimsky 714
    size_t name_len, thread_id_t *uspace_thread_id)
1066 jermar 715
{
1210 vana 716
    thread_t *t;
717
    char namebuf[THREAD_NAME_BUFLEN];
1103 jermar 718
    uspace_arg_t *kernel_uarg;
1288 jermar 719
    int rc;
1066 jermar 720
 
3593 rimsky 721
    if (name_len > THREAD_NAME_BUFLEN - 1)
722
        name_len = THREAD_NAME_BUFLEN - 1;
723
 
724
    rc = copy_from_uspace(namebuf, uspace_name, name_len);
1288 jermar 725
    if (rc != 0)
1780 jermar 726
        return (unative_t) rc;
1066 jermar 727
 
3593 rimsky 728
    namebuf[name_len] = '\0';
729
 
2470 jermar 730
    /*
731
     * In case of failure, kernel_uarg will be deallocated in this function.
732
     * In case of success, kernel_uarg will be freed in uinit().
733
     */
734
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
735
 
1288 jermar 736
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
737
    if (rc != 0) {
738
        free(kernel_uarg);
1780 jermar 739
        return (unative_t) rc;
1288 jermar 740
    }
1078 jermar 741
 
2440 jermar 742
    t = thread_create(uinit, kernel_uarg, TASK,
743
        THREAD_FLAG_USPACE | THREAD_FLAG_NOATTACH, namebuf, false);
2087 jermar 744
    if (t) {
2440 jermar 745
        if (uspace_thread_id != NULL) {
746
            int rc;
747
 
748
            rc = copy_to_uspace(uspace_thread_id, &t->tid,
749
                sizeof(t->tid));
750
            if (rc != 0) {
751
                /*
752
                 * We have encountered a failure, but the thread
753
                 * has already been created. We need to undo its
754
                 * creation now.
755
                 */
756
 
757
                /*
2446 jermar 758
                 * The new thread structure is initialized, but
759
                 * is still not visible to the system.
2440 jermar 760
                 * We can safely deallocate it.
761
                 */
762
                slab_free(thread_slab, t);
763
                free(kernel_uarg);
764
 
765
                return (unative_t) rc;
766
             }
767
        }
3665 rimsky 768
#ifdef CONFIG_UDEBUG
769
        /*
770
         * Generate udebug THREAD_B event and attach the thread.
771
         * This must be done atomically (with the debug locks held),
772
         * otherwise we would either miss some thread or receive
773
         * THREAD_B events for threads that already existed
774
         * and could be detected with THREAD_READ before.
775
         */
776
        udebug_thread_b_event_attach(t, TASK);
777
#else
2440 jermar 778
        thread_attach(t, TASK);
3665 rimsky 779
#endif
1210 vana 780
        thread_ready(t);
2440 jermar 781
 
782
        return 0;
2216 decky 783
    } else
1078 jermar 784
        free(kernel_uarg);
1066 jermar 785
 
1780 jermar 786
    return (unative_t) ENOMEM;
1066 jermar 787
}
788
 
789
/** Process syscall to terminate thread.
790
 *
791
 */
1780 jermar 792
unative_t sys_thread_exit(int uspace_status)
1066 jermar 793
{
1210 vana 794
    thread_exit();
795
    /* Unreachable */
796
    return 0;
1066 jermar 797
}
1702 cejka 798
 
2187 decky 799
/** Syscall for getting TID.
800
 *
2216 decky 801
 * @param uspace_thread_id Userspace address of 8-byte buffer where to store
802
 * current thread ID.
803
 *
804
 * @return 0 on success or an error code from @ref errno.h.
2187 decky 805
 */
2216 decky 806
unative_t sys_thread_get_id(thread_id_t *uspace_thread_id)
2187 decky 807
{
808
    /*
809
     * No need to acquire lock on THREAD because tid
810
     * remains constant for the lifespan of the thread.
811
     */
2216 decky 812
    return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid,
813
        sizeof(THREAD->tid));
2187 decky 814
}
815
 
1757 jermar 816
/** @}
1702 cejka 817
 */