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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>
2446 jermar 70
#include <console/klog.h>
7 jermar 71
 
1 jermar 72
 
1571 jermar 73
/** Thread states */
74
char *thread_states[] = {
75
    "Invalid",
76
    "Running",
77
    "Sleeping",
78
    "Ready",
79
    "Entering",
80
    "Exiting",
2451 jermar 81
    "Lingering"
1571 jermar 82
};
83
 
2502 jermar 84
/** Lock protecting the threads_tree AVL tree.
2067 jermar 85
 *
86
 * For locking rules, see declaration thereof.
87
 */
1158 jermar 88
SPINLOCK_INITIALIZE(threads_lock);
1 jermar 89
 
2925 svoboda 90
/** AVL tree of all threads.
1636 jermar 91
 *
2502 jermar 92
 * When a thread is found in the threads_tree AVL tree, it is guaranteed to
2067 jermar 93
 * exist as long as the threads_lock is held.
1636 jermar 94
 */
2502 jermar 95
avltree_t threads_tree;    
1636 jermar 96
 
623 jermar 97
SPINLOCK_INITIALIZE(tidlock);
2216 decky 98
thread_id_t last_tid = 0;
1 jermar 99
 
787 palkovsky 100
static slab_cache_t *thread_slab;
906 palkovsky 101
#ifdef ARCH_HAS_FPU
102
slab_cache_t *fpu_context_slab;
103
#endif
107 decky 104
 
2067 jermar 105
/** Thread wrapper.
107 decky 106
 *
2067 jermar 107
 * This wrapper is provided to ensure that every thread makes a call to
108
 * thread_exit() when its implementing function returns.
1 jermar 109
 *
413 jermar 110
 * interrupts_disable() is assumed.
107 decky 111
 *
1 jermar 112
 */
452 decky 113
static void cushion(void)
1 jermar 114
{
15 jermar 115
    void (*f)(void *) = THREAD->thread_code;
116
    void *arg = THREAD->thread_arg;
2032 decky 117
    THREAD->last_cycle = get_cycle();
1 jermar 118
 
2039 decky 119
    /* This is where each thread wakes up after its creation */
15 jermar 120
    spinlock_unlock(&THREAD->lock);
413 jermar 121
    interrupts_enable();
1 jermar 122
 
123
    f(arg);
2039 decky 124
 
125
    /* Accumulate accounting to the task */
126
    ipl_t ipl = interrupts_disable();
127
 
128
    spinlock_lock(&THREAD->lock);
2042 decky 129
    if (!THREAD->uncounted) {
130
        thread_update_accounting();
131
        uint64_t cycles = THREAD->cycles;
132
        THREAD->cycles = 0;
133
        spinlock_unlock(&THREAD->lock);
134
 
135
        spinlock_lock(&TASK->lock);
136
        TASK->cycles += cycles;
137
        spinlock_unlock(&TASK->lock);
138
    } else
139
        spinlock_unlock(&THREAD->lock);
2039 decky 140
 
141
    interrupts_restore(ipl);
142
 
1 jermar 143
    thread_exit();
144
    /* not reached */
145
}
146
 
787 palkovsky 147
/** Initialization and allocation for thread_t structure */
148
static int thr_constructor(void *obj, int kmflags)
149
{
1820 decky 150
    thread_t *t = (thread_t *) obj;
107 decky 151
 
787 palkovsky 152
    spinlock_initialize(&t->lock, "thread_t_lock");
153
    link_initialize(&t->rq_link);
154
    link_initialize(&t->wq_link);
155
    link_initialize(&t->th_link);
1854 jermar 156
 
157
    /* call the architecture-specific part of the constructor */
158
    thr_constructor_arch(t);
787 palkovsky 159
 
906 palkovsky 160
#ifdef ARCH_HAS_FPU
2440 jermar 161
#ifdef CONFIG_FPU_LAZY
906 palkovsky 162
    t->saved_fpu_context = NULL;
2440 jermar 163
#else
164
    t->saved_fpu_context = slab_alloc(fpu_context_slab, kmflags);
906 palkovsky 165
    if (!t->saved_fpu_context)
166
        return -1;
2440 jermar 167
#endif
906 palkovsky 168
#endif  
169
 
2118 decky 170
    t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags);
2440 jermar 171
    if (!t->kstack) {
906 palkovsky 172
#ifdef ARCH_HAS_FPU
173
        if (t->saved_fpu_context)
2440 jermar 174
            slab_free(fpu_context_slab, t->saved_fpu_context);
906 palkovsky 175
#endif
842 palkovsky 176
        return -1;
906 palkovsky 177
    }
787 palkovsky 178
 
2848 svoboda 179
    spinlock_initialize(&t->debug_lock, "thread_debug_lock");
180
 
787 palkovsky 181
    return 0;
182
}
183
 
184
/** Destruction of thread_t object */
185
static int thr_destructor(void *obj)
186
{
1820 decky 187
    thread_t *t = (thread_t *) obj;
787 palkovsky 188
 
1854 jermar 189
    /* call the architecture-specific part of the destructor */
190
    thr_destructor_arch(t);
191
 
1760 palkovsky 192
    frame_free(KA2PA(t->kstack));
906 palkovsky 193
#ifdef ARCH_HAS_FPU
194
    if (t->saved_fpu_context)
2440 jermar 195
        slab_free(fpu_context_slab, t->saved_fpu_context);
906 palkovsky 196
#endif
787 palkovsky 197
    return 1; /* One page freed */
198
}
199
 
107 decky 200
/** Initialize threads
201
 *
202
 * Initialize kernel threads support.
203
 *
204
 */
1 jermar 205
void thread_init(void)
206
{
15 jermar 207
    THREAD = NULL;
625 palkovsky 208
    atomic_set(&nrdy,0);
2067 jermar 209
    thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
2087 jermar 210
        thr_constructor, thr_destructor, 0);
2067 jermar 211
 
906 palkovsky 212
#ifdef ARCH_HAS_FPU
2067 jermar 213
    fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
2087 jermar 214
        FPU_CONTEXT_ALIGN, NULL, NULL, 0);
906 palkovsky 215
#endif
1158 jermar 216
 
2502 jermar 217
    avltree_create(&threads_tree);
1 jermar 218
}
219
 
107 decky 220
/** Make thread ready
221
 *
222
 * Switch thread t to the ready state.
223
 *
224
 * @param t Thread to make ready.
225
 *
226
 */
1 jermar 227
void thread_ready(thread_t *t)
228
{
229
    cpu_t *cpu;
230
    runq_t *r;
413 jermar 231
    ipl_t ipl;
625 palkovsky 232
    int i, avg;
1 jermar 233
 
413 jermar 234
    ipl = interrupts_disable();
1 jermar 235
 
236
    spinlock_lock(&t->lock);
237
 
2440 jermar 238
    ASSERT(!(t->state == Ready));
1086 palkovsky 239
 
2067 jermar 240
    i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;
1 jermar 241
 
16 jermar 242
    cpu = CPU;
1854 jermar 243
    if (t->flags & THREAD_FLAG_WIRED) {
2268 jermar 244
        ASSERT(t->cpu != NULL);
1 jermar 245
        cpu = t->cpu;
246
    }
1083 palkovsky 247
    t->state = Ready;
1 jermar 248
    spinlock_unlock(&t->lock);
249
 
107 decky 250
    /*
1 jermar 251
     * Append t to respective ready queue on respective processor.
252
     */
253
    r = &cpu->rq[i];
254
    spinlock_lock(&r->lock);
255
    list_append(&t->rq_link, &r->rq_head);
256
    r->n++;
257
    spinlock_unlock(&r->lock);
258
 
475 jermar 259
    atomic_inc(&nrdy);
625 palkovsky 260
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 261
    atomic_inc(&cpu->nrdy);
1 jermar 262
 
413 jermar 263
    interrupts_restore(ipl);
1 jermar 264
}
265
 
107 decky 266
/** Create new thread
267
 *
268
 * Create a new thread.
269
 *
2925 svoboda 270
 * @param func      Thread's implementing function.
271
 * @param arg       Thread's implementing function argument.
272
 * @param task      Task to which the thread belongs. The caller must
273
 *          guarantee that the task won't cease to exist during the
274
 *          call. The task's lock may not be held.
275
 * @param flags     Thread flags.
276
 * @param name      Symbolic name.
277
 * @param uncounted Thread's accounting doesn't affect accumulated task
278
 *          accounting.
107 decky 279
 *
2925 svoboda 280
 * @return      New thread's structure on success, NULL on failure.
107 decky 281
 *
282
 */
2067 jermar 283
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
2436 jermar 284
    int flags, char *name, bool uncounted)
1 jermar 285
{
286
    thread_t *t;
822 palkovsky 287
    ipl_t ipl;
288
 
787 palkovsky 289
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 290
    if (!t)
291
        return NULL;
1 jermar 292
 
822 palkovsky 293
    /* Not needed, but good for debugging */
2067 jermar 294
    memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES,
2087 jermar 295
        0);
822 palkovsky 296
 
297
    ipl = interrupts_disable();
298
    spinlock_lock(&tidlock);
299
    t->tid = ++last_tid;
300
    spinlock_unlock(&tidlock);
301
    interrupts_restore(ipl);
302
 
303
    context_save(&t->saved_context);
2067 jermar 304
    context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
2087 jermar 305
        THREAD_STACK_SIZE);
822 palkovsky 306
 
307
    the_initialize((the_t *) t->kstack);
308
 
309
    ipl = interrupts_disable();
310
    t->saved_context.ipl = interrupts_read();
311
    interrupts_restore(ipl);
312
 
1066 jermar 313
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
314
 
822 palkovsky 315
    t->thread_code = func;
316
    t->thread_arg = arg;
317
    t->ticks = -1;
2030 decky 318
    t->cycles = 0;
2042 decky 319
    t->uncounted = uncounted;
822 palkovsky 320
    t->priority = -1;       /* start in rq[0] */
321
    t->cpu = NULL;
1854 jermar 322
    t->flags = flags;
822 palkovsky 323
    t->state = Entering;
324
    t->call_me = NULL;
325
    t->call_me_with = NULL;
326
 
327
    timeout_initialize(&t->sleep_timeout);
1502 jermar 328
    t->sleep_interruptible = false;
822 palkovsky 329
    t->sleep_queue = NULL;
330
    t->timeout_pending = 0;
1288 jermar 331
 
332
    t->in_copy_from_uspace = false;
333
    t->in_copy_to_uspace = false;
1579 jermar 334
 
335
    t->interrupted = false;
1571 jermar 336
    t->detached = false;
337
    waitq_initialize(&t->join_wq);
338
 
822 palkovsky 339
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 340
 
822 palkovsky 341
    t->task = task;
342
 
860 decky 343
    t->fpu_context_exists = 0;
344
    t->fpu_context_engaged = 0;
1854 jermar 345
 
2502 jermar 346
    avltree_node_initialize(&t->threads_tree_node);
347
    t->threads_tree_node.key = (uintptr_t) t;
2801 svoboda 348
 
2817 svoboda 349
    /* Init debugging stuff */
2801 svoboda 350
    waitq_initialize(&t->go_wq);
2826 svoboda 351
    t->debug_go_call = NULL;
2817 svoboda 352
    t->uspace_state = NULL;
2825 svoboda 353
    t->debug_stop = true;
2898 svoboda 354
    t->debug_stoppable = true;
2827 svoboda 355
    t->debug_active = false;
2866 svoboda 356
    t->cur_event = 0;   /* none */
2502 jermar 357
 
2067 jermar 358
    /* might depend on previous initialization */
2799 svoboda 359
    thread_create_arch(t); 
2440 jermar 360
 
361
    if (!(flags & THREAD_FLAG_NOATTACH))
362
        thread_attach(t, task);
363
 
364
    return t;
365
}
366
 
2839 svoboda 367
/** Destroy thread structure of an unattached thread.
368
 *
369
 * Thread t must only have been created and never attached.
370
 */
371
void thread_unattached_free(thread_t *t)
372
{
373
    slab_free(thread_slab, t);
374
}
375
 
376
 
2440 jermar 377
/** Destroy thread memory structure
378
 *
379
 * Detach thread from all queues, cpus etc. and destroy it.
380
 *
381
 * Assume thread->lock is held!!
382
 */
383
void thread_destroy(thread_t *t)
384
{
2451 jermar 385
    ASSERT(t->state == Exiting || t->state == Lingering);
2440 jermar 386
    ASSERT(t->task);
387
    ASSERT(t->cpu);
388
 
389
    spinlock_lock(&t->cpu->lock);
390
    if (t->cpu->fpu_owner == t)
391
        t->cpu->fpu_owner = NULL;
392
    spinlock_unlock(&t->cpu->lock);
393
 
394
    spinlock_unlock(&t->lock);
395
 
396
    spinlock_lock(&threads_lock);
2502 jermar 397
    avltree_delete(&threads_tree, &t->threads_tree_node);
2440 jermar 398
    spinlock_unlock(&threads_lock);
399
 
400
    /*
401
     * Detach from the containing task.
402
     */
403
    spinlock_lock(&t->task->lock);
404
    list_remove(&t->th_link);
405
    spinlock_unlock(&t->task->lock);   
2446 jermar 406
 
407
    /*
408
     * t is guaranteed to be the very last thread of its task.
409
     * It is safe to destroy the task.
410
     */
411
    if (atomic_predec(&t->task->refcount) == 0)
2440 jermar 412
        task_destroy(t->task);
413
 
414
    slab_free(thread_slab, t);
415
}
416
 
417
/** Make the thread visible to the system.
418
 *
419
 * Attach the thread structure to the current task and make it visible in the
2502 jermar 420
 * threads_tree.
2440 jermar 421
 *
422
 * @param t Thread to be attached to the task.
423
 * @param task  Task to which the thread is to be attached.
424
 */
425
void thread_attach(thread_t *t, task_t *task)
426
{
427
    ipl_t ipl;
428
 
429
    /*
2902 svoboda 430
     * Attach to the specified task.
2440 jermar 431
     */
2446 jermar 432
    ipl = interrupts_disable();
2440 jermar 433
    spinlock_lock(&task->lock);
2902 svoboda 434
    atomic_inc(&task->refcount);
435
    /* Must not count kbox thread into lifecount */
436
    if (t->flags & THREAD_FLAG_USPACE)
437
        atomic_inc(&task->lifecount);
438
    list_append(&t->th_link, &task->th_head);
1579 jermar 439
    spinlock_unlock(&task->lock);
440
 
441
    /*
822 palkovsky 442
     * Register this thread in the system-wide list.
443
     */
2902 svoboda 444
    spinlock_lock(&threads_lock);
445
    avltree_insert(&threads_tree, &t->threads_tree_node);
446
    spinlock_unlock(&threads_lock);
822 palkovsky 447
 
448
    interrupts_restore(ipl);
1 jermar 449
}
450
 
1687 jermar 451
/** Terminate thread.
107 decky 452
 *
2067 jermar 453
 * End current thread execution and switch it to the exiting state. All pending
454
 * timeouts are executed.
107 decky 455
 */
1 jermar 456
void thread_exit(void)
457
{
413 jermar 458
    ipl_t ipl;
1 jermar 459
 
2902 svoboda 460
    if (THREAD->flags & THREAD_FLAG_USPACE) {
2903 svoboda 461
        /* Generate udebug THREAD_E event */
462
        udebug_thread_e_event();
463
 
2902 svoboda 464
        if (atomic_predec(&TASK->lifecount) == 0) {
465
            /*
466
             * We are the last userspace thread in the task that
467
             * still has not exited. With the exception of the
468
             * moment the task was created, new userspace threads
469
             * can only be created by threads of the same task.
470
             * We are safe to perform cleanup.
471
             */
2446 jermar 472
            ipc_cleanup();
2902 svoboda 473
                futex_cleanup();
2446 jermar 474
            klog_printf("Cleanup of task %llu completed.",
475
                TASK->taskid);
476
        }
477
    }
478
 
1 jermar 479
restart:
413 jermar 480
    ipl = interrupts_disable();
15 jermar 481
    spinlock_lock(&THREAD->lock);
2067 jermar 482
    if (THREAD->timeout_pending) {
483
        /* busy waiting for timeouts in progress */
15 jermar 484
        spinlock_unlock(&THREAD->lock);
413 jermar 485
        interrupts_restore(ipl);
1 jermar 486
        goto restart;
487
    }
2446 jermar 488
 
15 jermar 489
    THREAD->state = Exiting;
490
    spinlock_unlock(&THREAD->lock);
1 jermar 491
    scheduler();
1595 palkovsky 492
 
493
    /* Not reached */
494
    while (1)
495
        ;
1 jermar 496
}
497
 
107 decky 498
 
499
/** Thread sleep
500
 *
501
 * Suspend execution of the current thread.
502
 *
503
 * @param sec Number of seconds to sleep.
504
 *
505
 */
1780 jermar 506
void thread_sleep(uint32_t sec)
1 jermar 507
{
2067 jermar 508
    thread_usleep(sec * 1000000);
1 jermar 509
}
107 decky 510
 
1571 jermar 511
/** Wait for another thread to exit.
512
 *
513
 * @param t Thread to join on exit.
514
 * @param usec Timeout in microseconds.
515
 * @param flags Mode of operation.
516
 *
517
 * @return An error code from errno.h or an error code from synch.h.
518
 */
1780 jermar 519
int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
1571 jermar 520
{
521
    ipl_t ipl;
522
    int rc;
523
 
524
    if (t == THREAD)
525
        return EINVAL;
526
 
527
    /*
528
     * Since thread join can only be called once on an undetached thread,
529
     * the thread pointer is guaranteed to be still valid.
530
     */
531
 
532
    ipl = interrupts_disable();
533
    spinlock_lock(&t->lock);
534
    ASSERT(!t->detached);
535
    spinlock_unlock(&t->lock);
1687 jermar 536
    interrupts_restore(ipl);
1571 jermar 537
 
1687 jermar 538
    rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
1571 jermar 539
 
540
    return rc; 
541
}
542
 
543
/** Detach thread.
544
 *
2451 jermar 545
 * Mark the thread as detached, if the thread is already in the Lingering
546
 * state, deallocate its resources.
1571 jermar 547
 *
548
 * @param t Thread to be detached.
549
 */
550
void thread_detach(thread_t *t)
551
{
552
    ipl_t ipl;
553
 
554
    /*
2183 jermar 555
     * Since the thread is expected not to be already detached,
1571 jermar 556
     * pointer to it must be still valid.
557
     */
558
    ipl = interrupts_disable();
559
    spinlock_lock(&t->lock);
560
    ASSERT(!t->detached);
2451 jermar 561
    if (t->state == Lingering) {
1571 jermar 562
        thread_destroy(t);  /* unlocks &t->lock */
563
        interrupts_restore(ipl);
564
        return;
565
    } else {
566
        t->detached = true;
567
    }
568
    spinlock_unlock(&t->lock);
569
    interrupts_restore(ipl);
570
}
571
 
107 decky 572
/** Thread usleep
573
 *
574
 * Suspend execution of the current thread.
575
 *
576
 * @param usec Number of microseconds to sleep.
577
 *
578
 */
1780 jermar 579
void thread_usleep(uint32_t usec)
1 jermar 580
{
581
    waitq_t wq;
582
 
583
    waitq_initialize(&wq);
584
 
1502 jermar 585
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
1 jermar 586
}
587
 
107 decky 588
/** Register thread out-of-context invocation
589
 *
590
 * Register a function and its argument to be executed
591
 * on next context switch to the current thread.
592
 *
593
 * @param call_me      Out-of-context function.
594
 * @param call_me_with Out-of-context function argument.
595
 *
596
 */
1 jermar 597
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
598
{
413 jermar 599
    ipl_t ipl;
1 jermar 600
 
413 jermar 601
    ipl = interrupts_disable();
15 jermar 602
    spinlock_lock(&THREAD->lock);
603
    THREAD->call_me = call_me;
604
    THREAD->call_me_with = call_me_with;
605
    spinlock_unlock(&THREAD->lock);
413 jermar 606
    interrupts_restore(ipl);
1 jermar 607
}
777 palkovsky 608
 
2504 jermar 609
static bool thread_walker(avltree_node_t *node, void *arg)
2502 jermar 610
{
611
    thread_t *t;
612
 
613
    t = avltree_get_instance(node, thread_t, threads_tree_node);
614
 
615
    uint64_t cycles;
616
    char suffix;
617
    order(t->cycles, &cycles, &suffix);
2712 decky 618
 
619
    if (sizeof(void *) == 4)
620
        printf("%-6llu %-10s %#10zx %-8s %#10zx %-3ld %#10zx %#10zx %9llu%c ",
621
            t->tid, t->name, t, thread_states[t->state], t->task,
622
            t->task->context, t->thread_code, t->kstack, cycles, suffix);
623
    else
624
        printf("%-6llu %-10s %#18zx %-8s %#18zx %-3ld %#18zx %#18zx %9llu%c ",
625
            t->tid, t->name, t, thread_states[t->state], t->task,
626
            t->task->context, t->thread_code, t->kstack, cycles, suffix);
2502 jermar 627
 
628
    if (t->cpu)
629
        printf("%-4zd", t->cpu->id);
630
    else
631
        printf("none");
632
 
2712 decky 633
    if (t->state == Sleeping) {
634
        if (sizeof(uintptr_t) == 4)
635
            printf(" %#10zx", t->sleep_queue);
636
        else
637
            printf(" %#18zx", t->sleep_queue);
638
    }
2502 jermar 639
 
640
    printf("\n");
2504 jermar 641
 
642
    return true;
2502 jermar 643
}
644
 
777 palkovsky 645
/** Print list of threads debug info */
646
void thread_print_list(void)
647
{
648
    ipl_t ipl;
649
 
650
    /* Messing with thread structures, avoid deadlock */
651
    ipl = interrupts_disable();
652
    spinlock_lock(&threads_lock);
2030 decky 653
 
2712 decky 654
    if (sizeof(uintptr_t) == 4) {
655
        printf("tid    name       address    state    task       "
656
            "ctx code       stack      cycles     cpu  "
657
            "waitqueue\n");
658
        printf("------ ---------- ---------- -------- ---------- "
659
            "--- ---------- ---------- ---------- ---- "
660
            "----------\n");
661
    } else {
662
        printf("tid    name       address            state    task               "
663
            "ctx code               stack              cycles     cpu  "
664
            "waitqueue\n");
665
        printf("------ ---------- ------------------ -------- ------------------ "
666
            "--- ------------------ ------------------ ---------- ---- "
667
            "------------------\n");
668
    }
777 palkovsky 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
 
695
/** Update accounting of current thread.
696
 *
697
 * Note that thread_lock on THREAD must be already held and
698
 * interrupts must be already disabled.
699
 *
700
 */
701
void thread_update_accounting(void)
702
{
703
    uint64_t time = get_cycle();
704
    THREAD->cycles += time - THREAD->last_cycle;
705
    THREAD->last_cycle = time;
706
}
707
 
1066 jermar 708
/** Process syscall to create new thread.
709
 *
710
 */
2436 jermar 711
unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name,
712
    thread_id_t *uspace_thread_id)
1066 jermar 713
{
1210 vana 714
    thread_t *t;
715
    char namebuf[THREAD_NAME_BUFLEN];
1103 jermar 716
    uspace_arg_t *kernel_uarg;
1288 jermar 717
    int rc;
1066 jermar 718
 
1288 jermar 719
    rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
720
    if (rc != 0)
1780 jermar 721
        return (unative_t) rc;
1066 jermar 722
 
2470 jermar 723
    /*
724
     * In case of failure, kernel_uarg will be deallocated in this function.
725
     * In case of success, kernel_uarg will be freed in uinit().
726
     */
727
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
728
 
1288 jermar 729
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
730
    if (rc != 0) {
731
        free(kernel_uarg);
1780 jermar 732
        return (unative_t) rc;
1288 jermar 733
    }
1078 jermar 734
 
2440 jermar 735
    t = thread_create(uinit, kernel_uarg, TASK,
736
        THREAD_FLAG_USPACE | THREAD_FLAG_NOATTACH, namebuf, false);
2087 jermar 737
    if (t) {
2440 jermar 738
        if (uspace_thread_id != NULL) {
739
            int rc;
740
 
741
            rc = copy_to_uspace(uspace_thread_id, &t->tid,
742
                sizeof(t->tid));
743
            if (rc != 0) {
744
                /*
745
                 * We have encountered a failure, but the thread
746
                 * has already been created. We need to undo its
747
                 * creation now.
748
                 */
749
 
750
                /*
2446 jermar 751
                 * The new thread structure is initialized, but
752
                 * is still not visible to the system.
2440 jermar 753
                 * We can safely deallocate it.
754
                 */
755
                slab_free(thread_slab, t);
756
                free(kernel_uarg);
757
 
758
                return (unative_t) rc;
759
             }
760
        }
761
        thread_attach(t, TASK);
1210 vana 762
        thread_ready(t);
2440 jermar 763
 
2903 svoboda 764
        /* Generate udebug THREAD_B event */
765
        udebug_thread_b_event(t);
2867 svoboda 766
 
2440 jermar 767
        return 0;
2216 decky 768
    } else
1078 jermar 769
        free(kernel_uarg);
1066 jermar 770
 
1780 jermar 771
    return (unative_t) ENOMEM;
1066 jermar 772
}
773
 
774
/** Process syscall to terminate thread.
775
 *
776
 */
1780 jermar 777
unative_t sys_thread_exit(int uspace_status)
1066 jermar 778
{
1210 vana 779
    thread_exit();
780
    /* Unreachable */
781
    return 0;
1066 jermar 782
}
1702 cejka 783
 
2187 decky 784
/** Syscall for getting TID.
785
 *
2216 decky 786
 * @param uspace_thread_id Userspace address of 8-byte buffer where to store
787
 * current thread ID.
788
 *
789
 * @return 0 on success or an error code from @ref errno.h.
2187 decky 790
 */
2216 decky 791
unative_t sys_thread_get_id(thread_id_t *uspace_thread_id)
2187 decky 792
{
793
    /*
794
     * No need to acquire lock on THREAD because tid
795
     * remains constant for the lifespan of the thread.
796
     */
2216 decky 797
    return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid,
798
        sizeof(THREAD->tid));
2187 decky 799
}
800
 
1757 jermar 801
/** @}
1702 cejka 802
 */