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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>
2787 decky 71
#include <tdebug/tdebug.h>
7 jermar 72
 
1 jermar 73
 
1571 jermar 74
/** Thread states */
75
char *thread_states[] = {
76
    "Invalid",
77
    "Running",
78
    "Sleeping",
79
    "Ready",
80
    "Entering",
81
    "Exiting",
2451 jermar 82
    "Lingering"
1571 jermar 83
};
84
 
2502 jermar 85
/** Lock protecting the threads_tree AVL tree.
2067 jermar 86
 *
87
 * For locking rules, see declaration thereof.
88
 */
1158 jermar 89
SPINLOCK_INITIALIZE(threads_lock);
1 jermar 90
 
2502 jermar 91
/** ALV tree of all threads.
1636 jermar 92
 *
2502 jermar 93
 * When a thread is found in the threads_tree AVL tree, it is guaranteed to
2067 jermar 94
 * exist as long as the threads_lock is held.
1636 jermar 95
 */
2502 jermar 96
avltree_t threads_tree;    
1636 jermar 97
 
623 jermar 98
SPINLOCK_INITIALIZE(tidlock);
2216 decky 99
thread_id_t last_tid = 0;
1 jermar 100
 
787 palkovsky 101
static slab_cache_t *thread_slab;
906 palkovsky 102
#ifdef ARCH_HAS_FPU
103
slab_cache_t *fpu_context_slab;
104
#endif
107 decky 105
 
2067 jermar 106
/** Thread wrapper.
107 decky 107
 *
2067 jermar 108
 * This wrapper is provided to ensure that every thread makes a call to
109
 * thread_exit() when its implementing function returns.
1 jermar 110
 *
413 jermar 111
 * interrupts_disable() is assumed.
107 decky 112
 *
1 jermar 113
 */
452 decky 114
static void cushion(void)
1 jermar 115
{
15 jermar 116
    void (*f)(void *) = THREAD->thread_code;
117
    void *arg = THREAD->thread_arg;
2032 decky 118
    THREAD->last_cycle = get_cycle();
1 jermar 119
 
2039 decky 120
    /* This is where each thread wakes up after its creation */
15 jermar 121
    spinlock_unlock(&THREAD->lock);
413 jermar 122
    interrupts_enable();
1 jermar 123
 
124
    f(arg);
2039 decky 125
 
126
    /* Accumulate accounting to the task */
127
    ipl_t ipl = interrupts_disable();
128
 
129
    spinlock_lock(&THREAD->lock);
2042 decky 130
    if (!THREAD->uncounted) {
131
        thread_update_accounting();
132
        uint64_t cycles = THREAD->cycles;
133
        THREAD->cycles = 0;
134
        spinlock_unlock(&THREAD->lock);
135
 
136
        spinlock_lock(&TASK->lock);
137
        TASK->cycles += cycles;
138
        spinlock_unlock(&TASK->lock);
139
    } else
140
        spinlock_unlock(&THREAD->lock);
2039 decky 141
 
142
    interrupts_restore(ipl);
143
 
1 jermar 144
    thread_exit();
145
    /* not reached */
146
}
147
 
787 palkovsky 148
/** Initialization and allocation for thread_t structure */
149
static int thr_constructor(void *obj, int kmflags)
150
{
1820 decky 151
    thread_t *t = (thread_t *) obj;
107 decky 152
 
787 palkovsky 153
    spinlock_initialize(&t->lock, "thread_t_lock");
154
    link_initialize(&t->rq_link);
155
    link_initialize(&t->wq_link);
156
    link_initialize(&t->th_link);
1854 jermar 157
 
158
    /* call the architecture-specific part of the constructor */
159
    thr_constructor_arch(t);
787 palkovsky 160
 
906 palkovsky 161
#ifdef ARCH_HAS_FPU
2440 jermar 162
#ifdef CONFIG_FPU_LAZY
906 palkovsky 163
    t->saved_fpu_context = NULL;
2440 jermar 164
#else
165
    t->saved_fpu_context = slab_alloc(fpu_context_slab, kmflags);
906 palkovsky 166
    if (!t->saved_fpu_context)
167
        return -1;
2440 jermar 168
#endif
906 palkovsky 169
#endif  
170
 
2118 decky 171
    t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags);
2440 jermar 172
    if (!t->kstack) {
906 palkovsky 173
#ifdef ARCH_HAS_FPU
174
        if (t->saved_fpu_context)
2440 jermar 175
            slab_free(fpu_context_slab, t->saved_fpu_context);
906 palkovsky 176
#endif
842 palkovsky 177
        return -1;
906 palkovsky 178
    }
787 palkovsky 179
 
180
    return 0;
181
}
182
 
183
/** Destruction of thread_t object */
184
static int thr_destructor(void *obj)
185
{
1820 decky 186
    thread_t *t = (thread_t *) obj;
787 palkovsky 187
 
1854 jermar 188
    /* call the architecture-specific part of the destructor */
189
    thr_destructor_arch(t);
190
 
1760 palkovsky 191
    frame_free(KA2PA(t->kstack));
906 palkovsky 192
#ifdef ARCH_HAS_FPU
193
    if (t->saved_fpu_context)
2440 jermar 194
        slab_free(fpu_context_slab, t->saved_fpu_context);
906 palkovsky 195
#endif
787 palkovsky 196
    return 1; /* One page freed */
197
}
198
 
107 decky 199
/** Initialize threads
200
 *
201
 * Initialize kernel threads support.
202
 *
203
 */
1 jermar 204
void thread_init(void)
205
{
15 jermar 206
    THREAD = NULL;
625 palkovsky 207
    atomic_set(&nrdy,0);
2067 jermar 208
    thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
2087 jermar 209
        thr_constructor, thr_destructor, 0);
2067 jermar 210
 
906 palkovsky 211
#ifdef ARCH_HAS_FPU
2067 jermar 212
    fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
2087 jermar 213
        FPU_CONTEXT_ALIGN, NULL, NULL, 0);
906 palkovsky 214
#endif
1158 jermar 215
 
2502 jermar 216
    avltree_create(&threads_tree);
1 jermar 217
}
218
 
107 decky 219
/** Make thread ready
220
 *
221
 * Switch thread t to the ready state.
222
 *
223
 * @param t Thread to make ready.
224
 *
225
 */
1 jermar 226
void thread_ready(thread_t *t)
227
{
228
    cpu_t *cpu;
229
    runq_t *r;
413 jermar 230
    ipl_t ipl;
625 palkovsky 231
    int i, avg;
1 jermar 232
 
413 jermar 233
    ipl = interrupts_disable();
1 jermar 234
 
235
    spinlock_lock(&t->lock);
236
 
2440 jermar 237
    ASSERT(!(t->state == Ready));
1086 palkovsky 238
 
2067 jermar 239
    i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;
1 jermar 240
 
16 jermar 241
    cpu = CPU;
1854 jermar 242
    if (t->flags & THREAD_FLAG_WIRED) {
2268 jermar 243
        ASSERT(t->cpu != NULL);
1 jermar 244
        cpu = t->cpu;
245
    }
1083 palkovsky 246
    t->state = Ready;
1 jermar 247
    spinlock_unlock(&t->lock);
248
 
107 decky 249
    /*
1 jermar 250
     * Append t to respective ready queue on respective processor.
251
     */
252
    r = &cpu->rq[i];
253
    spinlock_lock(&r->lock);
254
    list_append(&t->rq_link, &r->rq_head);
255
    r->n++;
256
    spinlock_unlock(&r->lock);
257
 
475 jermar 258
    atomic_inc(&nrdy);
625 palkovsky 259
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 260
    atomic_inc(&cpu->nrdy);
1 jermar 261
 
413 jermar 262
    interrupts_restore(ipl);
1 jermar 263
}
264
 
107 decky 265
/** Create new thread
266
 *
267
 * Create a new thread.
268
 *
2042 decky 269
 * @param func      Thread's implementing function.
270
 * @param arg       Thread's implementing function argument.
271
 * @param task      Task to which the thread belongs.
272
 * @param flags     Thread flags.
273
 * @param name      Symbolic name.
2067 jermar 274
 * @param uncounted Thread's accounting doesn't affect accumulated task
2436 jermar 275
 *          accounting.
107 decky 276
 *
277
 * @return New thread's structure on success, NULL on failure.
278
 *
279
 */
2067 jermar 280
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
2436 jermar 281
    int flags, char *name, bool uncounted)
1 jermar 282
{
283
    thread_t *t;
822 palkovsky 284
    ipl_t ipl;
285
 
787 palkovsky 286
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 287
    if (!t)
288
        return NULL;
1 jermar 289
 
822 palkovsky 290
    /* Not needed, but good for debugging */
2067 jermar 291
    memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES,
2087 jermar 292
        0);
822 palkovsky 293
 
294
    ipl = interrupts_disable();
295
    spinlock_lock(&tidlock);
296
    t->tid = ++last_tid;
297
    spinlock_unlock(&tidlock);
298
    interrupts_restore(ipl);
299
 
300
    context_save(&t->saved_context);
2067 jermar 301
    context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
2087 jermar 302
        THREAD_STACK_SIZE);
822 palkovsky 303
 
304
    the_initialize((the_t *) t->kstack);
305
 
306
    ipl = interrupts_disable();
307
    t->saved_context.ipl = interrupts_read();
308
    interrupts_restore(ipl);
309
 
1066 jermar 310
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
311
 
822 palkovsky 312
    t->thread_code = func;
313
    t->thread_arg = arg;
314
    t->ticks = -1;
2030 decky 315
    t->cycles = 0;
2042 decky 316
    t->uncounted = uncounted;
822 palkovsky 317
    t->priority = -1;       /* start in rq[0] */
318
    t->cpu = NULL;
1854 jermar 319
    t->flags = flags;
822 palkovsky 320
    t->state = Entering;
321
    t->call_me = NULL;
322
    t->call_me_with = NULL;
323
 
324
    timeout_initialize(&t->sleep_timeout);
1502 jermar 325
    t->sleep_interruptible = false;
822 palkovsky 326
    t->sleep_queue = NULL;
327
    t->timeout_pending = 0;
1288 jermar 328
 
329
    t->in_copy_from_uspace = false;
330
    t->in_copy_to_uspace = false;
1579 jermar 331
 
332
    t->interrupted = false;
1571 jermar 333
    t->detached = false;
334
    waitq_initialize(&t->join_wq);
335
 
822 palkovsky 336
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 337
 
822 palkovsky 338
    t->task = task;
339
 
860 decky 340
    t->fpu_context_exists = 0;
341
    t->fpu_context_engaged = 0;
1854 jermar 342
 
2502 jermar 343
    avltree_node_initialize(&t->threads_tree_node);
344
    t->threads_tree_node.key = (uintptr_t) t;
2787 decky 345
//  t->threads_tree_node.key = (avltree_key_t) t->tid;
2502 jermar 346
 
2067 jermar 347
    /* might depend on previous initialization */
2787 decky 348
    thread_create_arch(t);
2440 jermar 349
 
2787 decky 350
    /* init tdebug stuff */
351
    tdebug_thread_init(t);
352
 
2440 jermar 353
    if (!(flags & THREAD_FLAG_NOATTACH))
354
        thread_attach(t, task);
355
 
356
    return t;
357
}
358
 
359
/** Destroy thread memory structure
360
 *
361
 * Detach thread from all queues, cpus etc. and destroy it.
362
 *
363
 * Assume thread->lock is held!!
364
 */
365
void thread_destroy(thread_t *t)
366
{
2451 jermar 367
    ASSERT(t->state == Exiting || t->state == Lingering);
2440 jermar 368
    ASSERT(t->task);
369
    ASSERT(t->cpu);
370
 
371
    spinlock_lock(&t->cpu->lock);
372
    if (t->cpu->fpu_owner == t)
373
        t->cpu->fpu_owner = NULL;
374
    spinlock_unlock(&t->cpu->lock);
375
 
376
    spinlock_unlock(&t->lock);
377
 
378
    spinlock_lock(&threads_lock);
2502 jermar 379
    avltree_delete(&threads_tree, &t->threads_tree_node);
2440 jermar 380
    spinlock_unlock(&threads_lock);
381
 
382
    /*
383
     * Detach from the containing task.
384
     */
385
    spinlock_lock(&t->task->lock);
386
    list_remove(&t->th_link);
387
    spinlock_unlock(&t->task->lock);   
2446 jermar 388
 
389
    /*
390
     * t is guaranteed to be the very last thread of its task.
391
     * It is safe to destroy the task.
392
     */
393
    if (atomic_predec(&t->task->refcount) == 0)
2440 jermar 394
        task_destroy(t->task);
395
 
396
    slab_free(thread_slab, t);
397
}
398
 
399
/** Make the thread visible to the system.
400
 *
401
 * Attach the thread structure to the current task and make it visible in the
2502 jermar 402
 * threads_tree.
2440 jermar 403
 *
404
 * @param t Thread to be attached to the task.
405
 * @param task  Task to which the thread is to be attached.
406
 */
407
void thread_attach(thread_t *t, task_t *task)
408
{
409
    ipl_t ipl;
410
 
411
    /*
412
     * Attach to the current task.
413
     */
2446 jermar 414
    ipl = interrupts_disable();
2440 jermar 415
    spinlock_lock(&task->lock);
2446 jermar 416
    atomic_inc(&task->refcount);
417
    atomic_inc(&task->lifecount);
1579 jermar 418
    list_append(&t->th_link, &task->th_head);
419
    spinlock_unlock(&task->lock);
420
 
421
    /*
822 palkovsky 422
     * Register this thread in the system-wide list.
423
     */
424
    spinlock_lock(&threads_lock);
2502 jermar 425
    avltree_insert(&threads_tree, &t->threads_tree_node);
822 palkovsky 426
    spinlock_unlock(&threads_lock);
427
 
428
    interrupts_restore(ipl);
1 jermar 429
}
430
 
1687 jermar 431
/** Terminate thread.
107 decky 432
 *
2067 jermar 433
 * End current thread execution and switch it to the exiting state. All pending
434
 * timeouts are executed.
107 decky 435
 */
1 jermar 436
void thread_exit(void)
437
{
413 jermar 438
    ipl_t ipl;
1 jermar 439
 
2446 jermar 440
    if (atomic_predec(&TASK->lifecount) == 0) {
441
        /*
442
         * We are the last thread in the task that still has not exited.
443
         * With the exception of the moment the task was created, new
444
         * threads can only be created by threads of the same task.
445
         * We are safe to perform cleanup.
446
         */
447
        if (THREAD->flags & THREAD_FLAG_USPACE) {
448
            ipc_cleanup();
449
                futex_cleanup();
2787 decky 450
            tdebug_cleanup();
2446 jermar 451
            klog_printf("Cleanup of task %llu completed.",
452
                TASK->taskid);
453
        }
454
    }
455
 
1 jermar 456
restart:
413 jermar 457
    ipl = interrupts_disable();
15 jermar 458
    spinlock_lock(&THREAD->lock);
2067 jermar 459
    if (THREAD->timeout_pending) {
460
        /* busy waiting for timeouts in progress */
15 jermar 461
        spinlock_unlock(&THREAD->lock);
413 jermar 462
        interrupts_restore(ipl);
1 jermar 463
        goto restart;
464
    }
2446 jermar 465
 
15 jermar 466
    THREAD->state = Exiting;
467
    spinlock_unlock(&THREAD->lock);
1 jermar 468
    scheduler();
1595 palkovsky 469
 
470
    /* Not reached */
471
    while (1)
472
        ;
1 jermar 473
}
474
 
107 decky 475
 
476
/** Thread sleep
477
 *
478
 * Suspend execution of the current thread.
479
 *
480
 * @param sec Number of seconds to sleep.
481
 *
482
 */
1780 jermar 483
void thread_sleep(uint32_t sec)
1 jermar 484
{
2067 jermar 485
    thread_usleep(sec * 1000000);
1 jermar 486
}
107 decky 487
 
1571 jermar 488
/** Wait for another thread to exit.
489
 *
490
 * @param t Thread to join on exit.
491
 * @param usec Timeout in microseconds.
492
 * @param flags Mode of operation.
493
 *
494
 * @return An error code from errno.h or an error code from synch.h.
495
 */
1780 jermar 496
int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
1571 jermar 497
{
498
    ipl_t ipl;
499
    int rc;
500
 
501
    if (t == THREAD)
502
        return EINVAL;
503
 
504
    /*
505
     * Since thread join can only be called once on an undetached thread,
506
     * the thread pointer is guaranteed to be still valid.
507
     */
508
 
509
    ipl = interrupts_disable();
510
    spinlock_lock(&t->lock);
511
    ASSERT(!t->detached);
512
    spinlock_unlock(&t->lock);
1687 jermar 513
    interrupts_restore(ipl);
1571 jermar 514
 
1687 jermar 515
    rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
1571 jermar 516
 
517
    return rc; 
518
}
519
 
520
/** Detach thread.
521
 *
2451 jermar 522
 * Mark the thread as detached, if the thread is already in the Lingering
523
 * state, deallocate its resources.
1571 jermar 524
 *
525
 * @param t Thread to be detached.
526
 */
527
void thread_detach(thread_t *t)
528
{
529
    ipl_t ipl;
530
 
531
    /*
2183 jermar 532
     * Since the thread is expected not to be already detached,
1571 jermar 533
     * pointer to it must be still valid.
534
     */
535
    ipl = interrupts_disable();
536
    spinlock_lock(&t->lock);
537
    ASSERT(!t->detached);
2451 jermar 538
    if (t->state == Lingering) {
1571 jermar 539
        thread_destroy(t);  /* unlocks &t->lock */
540
        interrupts_restore(ipl);
541
        return;
542
    } else {
543
        t->detached = true;
544
    }
545
    spinlock_unlock(&t->lock);
546
    interrupts_restore(ipl);
547
}
548
 
107 decky 549
/** Thread usleep
550
 *
551
 * Suspend execution of the current thread.
552
 *
553
 * @param usec Number of microseconds to sleep.
554
 *
555
 */
1780 jermar 556
void thread_usleep(uint32_t usec)
1 jermar 557
{
558
    waitq_t wq;
559
 
560
    waitq_initialize(&wq);
561
 
1502 jermar 562
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
1 jermar 563
}
564
 
107 decky 565
/** Register thread out-of-context invocation
566
 *
567
 * Register a function and its argument to be executed
568
 * on next context switch to the current thread.
569
 *
570
 * @param call_me      Out-of-context function.
571
 * @param call_me_with Out-of-context function argument.
572
 *
573
 */
1 jermar 574
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
575
{
413 jermar 576
    ipl_t ipl;
1 jermar 577
 
413 jermar 578
    ipl = interrupts_disable();
15 jermar 579
    spinlock_lock(&THREAD->lock);
580
    THREAD->call_me = call_me;
581
    THREAD->call_me_with = call_me_with;
582
    spinlock_unlock(&THREAD->lock);
413 jermar 583
    interrupts_restore(ipl);
1 jermar 584
}
777 palkovsky 585
 
2504 jermar 586
static bool thread_walker(avltree_node_t *node, void *arg)
2502 jermar 587
{
588
    thread_t *t;
589
 
590
    t = avltree_get_instance(node, thread_t, threads_tree_node);
591
 
592
    uint64_t cycles;
593
    char suffix;
594
    order(t->cycles, &cycles, &suffix);
2712 decky 595
 
596
    if (sizeof(void *) == 4)
597
        printf("%-6llu %-10s %#10zx %-8s %#10zx %-3ld %#10zx %#10zx %9llu%c ",
598
            t->tid, t->name, t, thread_states[t->state], t->task,
599
            t->task->context, t->thread_code, t->kstack, cycles, suffix);
600
    else
601
        printf("%-6llu %-10s %#18zx %-8s %#18zx %-3ld %#18zx %#18zx %9llu%c ",
602
            t->tid, t->name, t, thread_states[t->state], t->task,
603
            t->task->context, t->thread_code, t->kstack, cycles, suffix);
2502 jermar 604
 
605
    if (t->cpu)
606
        printf("%-4zd", t->cpu->id);
607
    else
608
        printf("none");
609
 
2712 decky 610
    if (t->state == Sleeping) {
611
        if (sizeof(uintptr_t) == 4)
612
            printf(" %#10zx", t->sleep_queue);
613
        else
614
            printf(" %#18zx", t->sleep_queue);
615
    }
2502 jermar 616
 
617
    printf("\n");
2504 jermar 618
 
619
    return true;
2502 jermar 620
}
621
 
777 palkovsky 622
/** Print list of threads debug info */
623
void thread_print_list(void)
624
{
625
    ipl_t ipl;
626
 
627
    /* Messing with thread structures, avoid deadlock */
628
    ipl = interrupts_disable();
629
    spinlock_lock(&threads_lock);
2030 decky 630
 
2712 decky 631
    if (sizeof(uintptr_t) == 4) {
632
        printf("tid    name       address    state    task       "
633
            "ctx code       stack      cycles     cpu  "
634
            "waitqueue\n");
635
        printf("------ ---------- ---------- -------- ---------- "
636
            "--- ---------- ---------- ---------- ---- "
637
            "----------\n");
638
    } else {
639
        printf("tid    name       address            state    task               "
640
            "ctx code               stack              cycles     cpu  "
641
            "waitqueue\n");
642
        printf("------ ---------- ------------------ -------- ------------------ "
643
            "--- ------------------ ------------------ ---------- ---- "
644
            "------------------\n");
645
    }
777 palkovsky 646
 
2504 jermar 647
    avltree_walk(&threads_tree, thread_walker, NULL);
1158 jermar 648
 
777 palkovsky 649
    spinlock_unlock(&threads_lock);
1060 palkovsky 650
    interrupts_restore(ipl);
777 palkovsky 651
}
1066 jermar 652
 
1158 jermar 653
/** Check whether thread exists.
654
 *
655
 * Note that threads_lock must be already held and
656
 * interrupts must be already disabled.
657
 *
658
 * @param t Pointer to thread.
659
 *
660
 * @return True if thread t is known to the system, false otherwise.
661
 */
662
bool thread_exists(thread_t *t)
663
{
2502 jermar 664
    avltree_node_t *node;
665
 
666
    node = avltree_search(&threads_tree, (avltree_key_t) ((uintptr_t) t));
1158 jermar 667
 
2502 jermar 668
    return node != NULL;
1158 jermar 669
}
670
 
2030 decky 671
 
672
/** Update accounting of current thread.
673
 *
674
 * Note that thread_lock on THREAD must be already held and
675
 * interrupts must be already disabled.
676
 *
677
 */
678
void thread_update_accounting(void)
679
{
680
    uint64_t time = get_cycle();
681
    THREAD->cycles += time - THREAD->last_cycle;
682
    THREAD->last_cycle = time;
683
}
684
 
1066 jermar 685
/** Process syscall to create new thread.
686
 *
687
 */
2436 jermar 688
unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name,
689
    thread_id_t *uspace_thread_id)
1066 jermar 690
{
1210 vana 691
    thread_t *t;
692
    char namebuf[THREAD_NAME_BUFLEN];
1103 jermar 693
    uspace_arg_t *kernel_uarg;
1288 jermar 694
    int rc;
1066 jermar 695
 
1288 jermar 696
    rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
697
    if (rc != 0)
1780 jermar 698
        return (unative_t) rc;
1066 jermar 699
 
2470 jermar 700
    /*
701
     * In case of failure, kernel_uarg will be deallocated in this function.
702
     * In case of success, kernel_uarg will be freed in uinit().
703
     */
704
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
705
 
1288 jermar 706
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
707
    if (rc != 0) {
708
        free(kernel_uarg);
1780 jermar 709
        return (unative_t) rc;
1288 jermar 710
    }
1078 jermar 711
 
2440 jermar 712
    t = thread_create(uinit, kernel_uarg, TASK,
713
        THREAD_FLAG_USPACE | THREAD_FLAG_NOATTACH, namebuf, false);
2087 jermar 714
    if (t) {
2440 jermar 715
        if (uspace_thread_id != NULL) {
716
            int rc;
717
 
718
            rc = copy_to_uspace(uspace_thread_id, &t->tid,
719
                sizeof(t->tid));
720
            if (rc != 0) {
721
                /*
722
                 * We have encountered a failure, but the thread
723
                 * has already been created. We need to undo its
724
                 * creation now.
725
                 */
726
 
727
                /*
2446 jermar 728
                 * The new thread structure is initialized, but
729
                 * is still not visible to the system.
2440 jermar 730
                 * We can safely deallocate it.
731
                 */
732
                slab_free(thread_slab, t);
733
                free(kernel_uarg);
734
 
735
                return (unative_t) rc;
736
             }
737
        }
738
        thread_attach(t, TASK);
1210 vana 739
        thread_ready(t);
2440 jermar 740
 
741
        return 0;
2216 decky 742
    } else
1078 jermar 743
        free(kernel_uarg);
1066 jermar 744
 
1780 jermar 745
    return (unative_t) ENOMEM;
1066 jermar 746
}
747
 
748
/** Process syscall to terminate thread.
749
 *
750
 */
1780 jermar 751
unative_t sys_thread_exit(int uspace_status)
1066 jermar 752
{
1210 vana 753
    thread_exit();
754
    /* Unreachable */
755
    return 0;
1066 jermar 756
}
1702 cejka 757
 
2787 decky 758
struct fbiw {
759
    thread_id_t tid;
760
    thread_t *t;
761
};
762
 
763
static bool find_by_id_walker(avltree_node_t *node, void *arg)
764
{
765
    thread_t *t = avltree_get_instance(node, thread_t, threads_tree_node);
766
    struct fbiw *s = (struct fbiw *)arg;
767
 
768
    if (t->tid == s->tid) {
769
        /* found it! */
770
        s->t = t;
771
        return false;
772
    }
773
 
774
    return true;    /* continue */
775
}
776
 
777
/** Find thread structure corresponding to thread ID.
778
 *
779
 * The threads_lock must be already held by the caller of this function
780
 * and interrupts must be disabled.
781
 *
782
 * @param id Thread ID.
783
 *
784
 * @return Thread structure address or NULL if there is no such thread ID.
785
 */
786
thread_t *thread_find_by_id(thread_id_t id)
787
{
788
    struct fbiw s;
789
 
790
    s.t = NULL;
791
    s.tid = id;
792
 
793
    avltree_walk(&threads_tree, find_by_id_walker, &s);
794
 
795
    return s.t;
796
/*
797
    // ANO, takhle krasne by to fungovalo, kdyby threads_tree
798
    // nepouzival jako klic pointer na vlakno misto tid
799
    avltree_node_t *node;
800
 
801
    node = avltree_search(&threads_tree, (avltree_key_t) id);
802
 
803
    if (node)
804
        return avltree_get_instance(node, thread_t, threads_tree_node);
805
    return NULL;*/
806
}
807
 
2187 decky 808
/** Syscall for getting TID.
809
 *
2216 decky 810
 * @param uspace_thread_id Userspace address of 8-byte buffer where to store
811
 * current thread ID.
812
 *
813
 * @return 0 on success or an error code from @ref errno.h.
2187 decky 814
 */
2216 decky 815
unative_t sys_thread_get_id(thread_id_t *uspace_thread_id)
2187 decky 816
{
817
    /*
818
     * No need to acquire lock on THREAD because tid
819
     * remains constant for the lifespan of the thread.
820
     */
2216 decky 821
    return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid,
822
        sizeof(THREAD->tid));
2187 decky 823
}
824
 
1757 jermar 825
/** @}
1702 cejka 826
 */