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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
 
2790 jermar 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
 
179
    return 0;
180
}
181
 
182
/** Destruction of thread_t object */
183
static int thr_destructor(void *obj)
184
{
1820 decky 185
    thread_t *t = (thread_t *) obj;
787 palkovsky 186
 
1854 jermar 187
    /* call the architecture-specific part of the destructor */
188
    thr_destructor_arch(t);
189
 
1760 palkovsky 190
    frame_free(KA2PA(t->kstack));
906 palkovsky 191
#ifdef ARCH_HAS_FPU
192
    if (t->saved_fpu_context)
2440 jermar 193
        slab_free(fpu_context_slab, t->saved_fpu_context);
906 palkovsky 194
#endif
787 palkovsky 195
    return 1; /* One page freed */
196
}
197
 
107 decky 198
/** Initialize threads
199
 *
200
 * Initialize kernel threads support.
201
 *
202
 */
1 jermar 203
void thread_init(void)
204
{
15 jermar 205
    THREAD = NULL;
625 palkovsky 206
    atomic_set(&nrdy,0);
2067 jermar 207
    thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
2087 jermar 208
        thr_constructor, thr_destructor, 0);
2067 jermar 209
 
906 palkovsky 210
#ifdef ARCH_HAS_FPU
2067 jermar 211
    fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
2087 jermar 212
        FPU_CONTEXT_ALIGN, NULL, NULL, 0);
906 palkovsky 213
#endif
1158 jermar 214
 
2502 jermar 215
    avltree_create(&threads_tree);
1 jermar 216
}
217
 
107 decky 218
/** Make thread ready
219
 *
220
 * Switch thread t to the ready state.
221
 *
222
 * @param t Thread to make ready.
223
 *
224
 */
1 jermar 225
void thread_ready(thread_t *t)
226
{
227
    cpu_t *cpu;
228
    runq_t *r;
413 jermar 229
    ipl_t ipl;
625 palkovsky 230
    int i, avg;
1 jermar 231
 
413 jermar 232
    ipl = interrupts_disable();
1 jermar 233
 
234
    spinlock_lock(&t->lock);
235
 
2440 jermar 236
    ASSERT(!(t->state == Ready));
1086 palkovsky 237
 
2067 jermar 238
    i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;
1 jermar 239
 
16 jermar 240
    cpu = CPU;
1854 jermar 241
    if (t->flags & THREAD_FLAG_WIRED) {
2268 jermar 242
        ASSERT(t->cpu != NULL);
1 jermar 243
        cpu = t->cpu;
244
    }
1083 palkovsky 245
    t->state = Ready;
1 jermar 246
    spinlock_unlock(&t->lock);
247
 
107 decky 248
    /*
1 jermar 249
     * Append t to respective ready queue on respective processor.
250
     */
251
    r = &cpu->rq[i];
252
    spinlock_lock(&r->lock);
253
    list_append(&t->rq_link, &r->rq_head);
254
    r->n++;
255
    spinlock_unlock(&r->lock);
256
 
475 jermar 257
    atomic_inc(&nrdy);
625 palkovsky 258
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 259
    atomic_inc(&cpu->nrdy);
1 jermar 260
 
413 jermar 261
    interrupts_restore(ipl);
1 jermar 262
}
263
 
107 decky 264
/** Create new thread
265
 *
266
 * Create a new thread.
267
 *
2907 jermar 268
 * @param func      Thread's implementing function.
269
 * @param arg       Thread's implementing function argument.
270
 * @param task      Task to which the thread belongs. The caller must
271
 *          guarantee that the task won't cease to exist during the
272
 *          call. The task's lock may not be held.
273
 * @param flags     Thread flags.
274
 * @param name      Symbolic name.
275
 * @param uncounted Thread's accounting doesn't affect accumulated task
276
 *          accounting.
107 decky 277
 *
2907 jermar 278
 * @return      New thread's structure on success, NULL on failure.
107 decky 279
 *
280
 */
2067 jermar 281
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
2436 jermar 282
    int flags, char *name, bool uncounted)
1 jermar 283
{
284
    thread_t *t;
822 palkovsky 285
    ipl_t ipl;
286
 
787 palkovsky 287
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 288
    if (!t)
289
        return NULL;
1 jermar 290
 
822 palkovsky 291
    /* Not needed, but good for debugging */
2067 jermar 292
    memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES,
2087 jermar 293
        0);
822 palkovsky 294
 
295
    ipl = interrupts_disable();
296
    spinlock_lock(&tidlock);
297
    t->tid = ++last_tid;
298
    spinlock_unlock(&tidlock);
299
    interrupts_restore(ipl);
300
 
301
    context_save(&t->saved_context);
2067 jermar 302
    context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
2087 jermar 303
        THREAD_STACK_SIZE);
822 palkovsky 304
 
305
    the_initialize((the_t *) t->kstack);
306
 
307
    ipl = interrupts_disable();
308
    t->saved_context.ipl = interrupts_read();
309
    interrupts_restore(ipl);
310
 
1066 jermar 311
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
312
 
822 palkovsky 313
    t->thread_code = func;
314
    t->thread_arg = arg;
315
    t->ticks = -1;
2030 decky 316
    t->cycles = 0;
2042 decky 317
    t->uncounted = uncounted;
822 palkovsky 318
    t->priority = -1;       /* start in rq[0] */
319
    t->cpu = NULL;
1854 jermar 320
    t->flags = flags;
822 palkovsky 321
    t->state = Entering;
322
    t->call_me = NULL;
323
    t->call_me_with = NULL;
324
 
325
    timeout_initialize(&t->sleep_timeout);
1502 jermar 326
    t->sleep_interruptible = false;
822 palkovsky 327
    t->sleep_queue = NULL;
328
    t->timeout_pending = 0;
1288 jermar 329
 
330
    t->in_copy_from_uspace = false;
331
    t->in_copy_to_uspace = false;
1579 jermar 332
 
333
    t->interrupted = false;
1571 jermar 334
    t->detached = false;
335
    waitq_initialize(&t->join_wq);
336
 
822 palkovsky 337
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 338
 
822 palkovsky 339
    t->task = task;
340
 
860 decky 341
    t->fpu_context_exists = 0;
342
    t->fpu_context_engaged = 0;
1854 jermar 343
 
2502 jermar 344
    avltree_node_initialize(&t->threads_tree_node);
345
    t->threads_tree_node.key = (uintptr_t) t;
346
 
2067 jermar 347
    /* might depend on previous initialization */
348
    thread_create_arch(t); 
2440 jermar 349
 
350
    if (!(flags & THREAD_FLAG_NOATTACH))
351
        thread_attach(t, task);
352
 
353
    return t;
354
}
355
 
356
/** Destroy thread memory structure
357
 *
358
 * Detach thread from all queues, cpus etc. and destroy it.
359
 *
360
 * Assume thread->lock is held!!
361
 */
362
void thread_destroy(thread_t *t)
363
{
2451 jermar 364
    ASSERT(t->state == Exiting || t->state == Lingering);
2440 jermar 365
    ASSERT(t->task);
366
    ASSERT(t->cpu);
367
 
368
    spinlock_lock(&t->cpu->lock);
369
    if (t->cpu->fpu_owner == t)
370
        t->cpu->fpu_owner = NULL;
371
    spinlock_unlock(&t->cpu->lock);
372
 
373
    spinlock_unlock(&t->lock);
374
 
375
    spinlock_lock(&threads_lock);
2502 jermar 376
    avltree_delete(&threads_tree, &t->threads_tree_node);
2440 jermar 377
    spinlock_unlock(&threads_lock);
378
 
379
    /*
380
     * Detach from the containing task.
381
     */
382
    spinlock_lock(&t->task->lock);
383
    list_remove(&t->th_link);
384
    spinlock_unlock(&t->task->lock);   
2446 jermar 385
 
386
    /*
387
     * t is guaranteed to be the very last thread of its task.
388
     * It is safe to destroy the task.
389
     */
390
    if (atomic_predec(&t->task->refcount) == 0)
2440 jermar 391
        task_destroy(t->task);
392
 
393
    slab_free(thread_slab, t);
394
}
395
 
396
/** Make the thread visible to the system.
397
 *
398
 * Attach the thread structure to the current task and make it visible in the
2502 jermar 399
 * threads_tree.
2440 jermar 400
 *
401
 * @param t Thread to be attached to the task.
402
 * @param task  Task to which the thread is to be attached.
403
 */
404
void thread_attach(thread_t *t, task_t *task)
405
{
406
    ipl_t ipl;
407
 
408
    /*
409
     * Attach to the current task.
410
     */
2446 jermar 411
    ipl = interrupts_disable();
2440 jermar 412
    spinlock_lock(&task->lock);
2446 jermar 413
    atomic_inc(&task->refcount);
414
    atomic_inc(&task->lifecount);
1579 jermar 415
    list_append(&t->th_link, &task->th_head);
416
    spinlock_unlock(&task->lock);
417
 
418
    /*
822 palkovsky 419
     * Register this thread in the system-wide list.
420
     */
421
    spinlock_lock(&threads_lock);
2502 jermar 422
    avltree_insert(&threads_tree, &t->threads_tree_node);
822 palkovsky 423
    spinlock_unlock(&threads_lock);
424
 
425
    interrupts_restore(ipl);
1 jermar 426
}
427
 
1687 jermar 428
/** Terminate thread.
107 decky 429
 *
2067 jermar 430
 * End current thread execution and switch it to the exiting state. All pending
431
 * timeouts are executed.
107 decky 432
 */
1 jermar 433
void thread_exit(void)
434
{
413 jermar 435
    ipl_t ipl;
1 jermar 436
 
2446 jermar 437
    if (atomic_predec(&TASK->lifecount) == 0) {
438
        /*
439
         * We are the last thread in the task that still has not exited.
440
         * With the exception of the moment the task was created, new
441
         * threads can only be created by threads of the same task.
442
         * We are safe to perform cleanup.
443
         */
444
        if (THREAD->flags & THREAD_FLAG_USPACE) {
445
            ipc_cleanup();
446
                futex_cleanup();
447
            klog_printf("Cleanup of task %llu completed.",
448
                TASK->taskid);
449
        }
450
    }
451
 
1 jermar 452
restart:
413 jermar 453
    ipl = interrupts_disable();
15 jermar 454
    spinlock_lock(&THREAD->lock);
2067 jermar 455
    if (THREAD->timeout_pending) {
456
        /* busy waiting for timeouts in progress */
15 jermar 457
        spinlock_unlock(&THREAD->lock);
413 jermar 458
        interrupts_restore(ipl);
1 jermar 459
        goto restart;
460
    }
2446 jermar 461
 
15 jermar 462
    THREAD->state = Exiting;
463
    spinlock_unlock(&THREAD->lock);
1 jermar 464
    scheduler();
1595 palkovsky 465
 
466
    /* Not reached */
467
    while (1)
468
        ;
1 jermar 469
}
470
 
107 decky 471
 
472
/** Thread sleep
473
 *
474
 * Suspend execution of the current thread.
475
 *
476
 * @param sec Number of seconds to sleep.
477
 *
478
 */
1780 jermar 479
void thread_sleep(uint32_t sec)
1 jermar 480
{
2067 jermar 481
    thread_usleep(sec * 1000000);
1 jermar 482
}
107 decky 483
 
1571 jermar 484
/** Wait for another thread to exit.
485
 *
486
 * @param t Thread to join on exit.
487
 * @param usec Timeout in microseconds.
488
 * @param flags Mode of operation.
489
 *
490
 * @return An error code from errno.h or an error code from synch.h.
491
 */
1780 jermar 492
int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
1571 jermar 493
{
494
    ipl_t ipl;
495
    int rc;
496
 
497
    if (t == THREAD)
498
        return EINVAL;
499
 
500
    /*
501
     * Since thread join can only be called once on an undetached thread,
502
     * the thread pointer is guaranteed to be still valid.
503
     */
504
 
505
    ipl = interrupts_disable();
506
    spinlock_lock(&t->lock);
507
    ASSERT(!t->detached);
508
    spinlock_unlock(&t->lock);
1687 jermar 509
    interrupts_restore(ipl);
1571 jermar 510
 
1687 jermar 511
    rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
1571 jermar 512
 
513
    return rc; 
514
}
515
 
516
/** Detach thread.
517
 *
2451 jermar 518
 * Mark the thread as detached, if the thread is already in the Lingering
519
 * state, deallocate its resources.
1571 jermar 520
 *
521
 * @param t Thread to be detached.
522
 */
523
void thread_detach(thread_t *t)
524
{
525
    ipl_t ipl;
526
 
527
    /*
2183 jermar 528
     * Since the thread is expected not to be already detached,
1571 jermar 529
     * pointer to it must be still valid.
530
     */
531
    ipl = interrupts_disable();
532
    spinlock_lock(&t->lock);
533
    ASSERT(!t->detached);
2451 jermar 534
    if (t->state == Lingering) {
1571 jermar 535
        thread_destroy(t);  /* unlocks &t->lock */
536
        interrupts_restore(ipl);
537
        return;
538
    } else {
539
        t->detached = true;
540
    }
541
    spinlock_unlock(&t->lock);
542
    interrupts_restore(ipl);
543
}
544
 
107 decky 545
/** Thread usleep
546
 *
547
 * Suspend execution of the current thread.
548
 *
549
 * @param usec Number of microseconds to sleep.
550
 *
551
 */
1780 jermar 552
void thread_usleep(uint32_t usec)
1 jermar 553
{
554
    waitq_t wq;
555
 
556
    waitq_initialize(&wq);
557
 
1502 jermar 558
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
1 jermar 559
}
560
 
107 decky 561
/** Register thread out-of-context invocation
562
 *
563
 * Register a function and its argument to be executed
564
 * on next context switch to the current thread.
565
 *
566
 * @param call_me      Out-of-context function.
567
 * @param call_me_with Out-of-context function argument.
568
 *
569
 */
1 jermar 570
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
571
{
413 jermar 572
    ipl_t ipl;
1 jermar 573
 
413 jermar 574
    ipl = interrupts_disable();
15 jermar 575
    spinlock_lock(&THREAD->lock);
576
    THREAD->call_me = call_me;
577
    THREAD->call_me_with = call_me_with;
578
    spinlock_unlock(&THREAD->lock);
413 jermar 579
    interrupts_restore(ipl);
1 jermar 580
}
777 palkovsky 581
 
2504 jermar 582
static bool thread_walker(avltree_node_t *node, void *arg)
2502 jermar 583
{
584
    thread_t *t;
585
 
586
    t = avltree_get_instance(node, thread_t, threads_tree_node);
587
 
588
    uint64_t cycles;
589
    char suffix;
590
    order(t->cycles, &cycles, &suffix);
2712 decky 591
 
592
    if (sizeof(void *) == 4)
593
        printf("%-6llu %-10s %#10zx %-8s %#10zx %-3ld %#10zx %#10zx %9llu%c ",
594
            t->tid, t->name, t, thread_states[t->state], t->task,
595
            t->task->context, t->thread_code, t->kstack, cycles, suffix);
596
    else
597
        printf("%-6llu %-10s %#18zx %-8s %#18zx %-3ld %#18zx %#18zx %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);
2502 jermar 600
 
601
    if (t->cpu)
602
        printf("%-4zd", t->cpu->id);
603
    else
604
        printf("none");
605
 
2712 decky 606
    if (t->state == Sleeping) {
607
        if (sizeof(uintptr_t) == 4)
608
            printf(" %#10zx", t->sleep_queue);
609
        else
610
            printf(" %#18zx", t->sleep_queue);
611
    }
2502 jermar 612
 
613
    printf("\n");
2504 jermar 614
 
615
    return true;
2502 jermar 616
}
617
 
777 palkovsky 618
/** Print list of threads debug info */
619
void thread_print_list(void)
620
{
621
    ipl_t ipl;
622
 
623
    /* Messing with thread structures, avoid deadlock */
624
    ipl = interrupts_disable();
625
    spinlock_lock(&threads_lock);
2030 decky 626
 
2712 decky 627
    if (sizeof(uintptr_t) == 4) {
628
        printf("tid    name       address    state    task       "
629
            "ctx code       stack      cycles     cpu  "
630
            "waitqueue\n");
631
        printf("------ ---------- ---------- -------- ---------- "
632
            "--- ---------- ---------- ---------- ---- "
633
            "----------\n");
634
    } else {
635
        printf("tid    name       address            state    task               "
636
            "ctx code               stack              cycles     cpu  "
637
            "waitqueue\n");
638
        printf("------ ---------- ------------------ -------- ------------------ "
639
            "--- ------------------ ------------------ ---------- ---- "
640
            "------------------\n");
641
    }
777 palkovsky 642
 
2504 jermar 643
    avltree_walk(&threads_tree, thread_walker, NULL);
1158 jermar 644
 
777 palkovsky 645
    spinlock_unlock(&threads_lock);
1060 palkovsky 646
    interrupts_restore(ipl);
777 palkovsky 647
}
1066 jermar 648
 
1158 jermar 649
/** Check whether thread exists.
650
 *
651
 * Note that threads_lock must be already held and
652
 * interrupts must be already disabled.
653
 *
654
 * @param t Pointer to thread.
655
 *
656
 * @return True if thread t is known to the system, false otherwise.
657
 */
658
bool thread_exists(thread_t *t)
659
{
2502 jermar 660
    avltree_node_t *node;
661
 
662
    node = avltree_search(&threads_tree, (avltree_key_t) ((uintptr_t) t));
1158 jermar 663
 
2502 jermar 664
    return node != NULL;
1158 jermar 665
}
666
 
2030 decky 667
 
668
/** Update accounting of current thread.
669
 *
670
 * Note that thread_lock on THREAD must be already held and
671
 * interrupts must be already disabled.
672
 *
673
 */
674
void thread_update_accounting(void)
675
{
676
    uint64_t time = get_cycle();
677
    THREAD->cycles += time - THREAD->last_cycle;
678
    THREAD->last_cycle = time;
679
}
680
 
1066 jermar 681
/** Process syscall to create new thread.
682
 *
683
 */
2436 jermar 684
unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name,
685
    thread_id_t *uspace_thread_id)
1066 jermar 686
{
1210 vana 687
    thread_t *t;
688
    char namebuf[THREAD_NAME_BUFLEN];
1103 jermar 689
    uspace_arg_t *kernel_uarg;
1288 jermar 690
    int rc;
1066 jermar 691
 
1288 jermar 692
    rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
693
    if (rc != 0)
1780 jermar 694
        return (unative_t) rc;
1066 jermar 695
 
2470 jermar 696
    /*
697
     * In case of failure, kernel_uarg will be deallocated in this function.
698
     * In case of success, kernel_uarg will be freed in uinit().
699
     */
700
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
701
 
1288 jermar 702
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
703
    if (rc != 0) {
704
        free(kernel_uarg);
1780 jermar 705
        return (unative_t) rc;
1288 jermar 706
    }
1078 jermar 707
 
2440 jermar 708
    t = thread_create(uinit, kernel_uarg, TASK,
709
        THREAD_FLAG_USPACE | THREAD_FLAG_NOATTACH, namebuf, false);
2087 jermar 710
    if (t) {
2440 jermar 711
        if (uspace_thread_id != NULL) {
712
            int rc;
713
 
714
            rc = copy_to_uspace(uspace_thread_id, &t->tid,
715
                sizeof(t->tid));
716
            if (rc != 0) {
717
                /*
718
                 * We have encountered a failure, but the thread
719
                 * has already been created. We need to undo its
720
                 * creation now.
721
                 */
722
 
723
                /*
2446 jermar 724
                 * The new thread structure is initialized, but
725
                 * is still not visible to the system.
2440 jermar 726
                 * We can safely deallocate it.
727
                 */
728
                slab_free(thread_slab, t);
729
                free(kernel_uarg);
730
 
731
                return (unative_t) rc;
732
             }
733
        }
734
        thread_attach(t, TASK);
1210 vana 735
        thread_ready(t);
2440 jermar 736
 
737
        return 0;
2216 decky 738
    } else
1078 jermar 739
        free(kernel_uarg);
1066 jermar 740
 
1780 jermar 741
    return (unative_t) ENOMEM;
1066 jermar 742
}
743
 
744
/** Process syscall to terminate thread.
745
 *
746
 */
1780 jermar 747
unative_t sys_thread_exit(int uspace_status)
1066 jermar 748
{
1210 vana 749
    thread_exit();
750
    /* Unreachable */
751
    return 0;
1066 jermar 752
}
1702 cejka 753
 
2187 decky 754
/** Syscall for getting TID.
755
 *
2216 decky 756
 * @param uspace_thread_id Userspace address of 8-byte buffer where to store
757
 * current thread ID.
758
 *
759
 * @return 0 on success or an error code from @ref errno.h.
2187 decky 760
 */
2216 decky 761
unative_t sys_thread_get_id(thread_id_t *uspace_thread_id)
2187 decky 762
{
763
    /*
764
     * No need to acquire lock on THREAD because tid
765
     * remains constant for the lifespan of the thread.
766
     */
2216 decky 767
    return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid,
768
        sizeof(THREAD->tid));
2187 decky 769
}
770
 
1757 jermar 771
/** @}
1702 cejka 772
 */