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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;
625 palkovsky 214
    atomic_set(&nrdy,0);
2067 jermar 215
    thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
2087 jermar 216
        thr_constructor, thr_destructor, 0);
2067 jermar 217
 
906 palkovsky 218
#ifdef ARCH_HAS_FPU
2067 jermar 219
    fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
2087 jermar 220
        FPU_CONTEXT_ALIGN, NULL, NULL, 0);
906 palkovsky 221
#endif
1158 jermar 222
 
2502 jermar 223
    avltree_create(&threads_tree);
1 jermar 224
}
225
 
107 decky 226
/** Make thread ready
227
 *
228
 * Switch thread t to the ready state.
229
 *
230
 * @param t Thread to make ready.
231
 *
232
 */
1 jermar 233
void thread_ready(thread_t *t)
234
{
235
    cpu_t *cpu;
236
    runq_t *r;
413 jermar 237
    ipl_t ipl;
625 palkovsky 238
    int i, avg;
1 jermar 239
 
413 jermar 240
    ipl = interrupts_disable();
1 jermar 241
 
242
    spinlock_lock(&t->lock);
243
 
2440 jermar 244
    ASSERT(!(t->state == Ready));
1086 palkovsky 245
 
2067 jermar 246
    i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;
1 jermar 247
 
16 jermar 248
    cpu = CPU;
1854 jermar 249
    if (t->flags & THREAD_FLAG_WIRED) {
2268 jermar 250
        ASSERT(t->cpu != NULL);
1 jermar 251
        cpu = t->cpu;
252
    }
1083 palkovsky 253
    t->state = Ready;
1 jermar 254
    spinlock_unlock(&t->lock);
255
 
107 decky 256
    /*
1 jermar 257
     * Append t to respective ready queue on respective processor.
258
     */
259
    r = &cpu->rq[i];
260
    spinlock_lock(&r->lock);
261
    list_append(&t->rq_link, &r->rq_head);
262
    r->n++;
263
    spinlock_unlock(&r->lock);
264
 
475 jermar 265
    atomic_inc(&nrdy);
625 palkovsky 266
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 267
    atomic_inc(&cpu->nrdy);
1 jermar 268
 
413 jermar 269
    interrupts_restore(ipl);
1 jermar 270
}
271
 
107 decky 272
/** Create new thread
273
 *
274
 * Create a new thread.
275
 *
2907 jermar 276
 * @param func      Thread's implementing function.
277
 * @param arg       Thread's implementing function argument.
278
 * @param task      Task to which the thread belongs. The caller must
279
 *          guarantee that the task won't cease to exist during the
280
 *          call. The task's lock may not be held.
281
 * @param flags     Thread flags.
3593 rimsky 282
 * @param name      Symbolic name (a copy is made).
2907 jermar 283
 * @param uncounted Thread's accounting doesn't affect accumulated task
284
 *          accounting.
107 decky 285
 *
2907 jermar 286
 * @return      New thread's structure on success, NULL on failure.
107 decky 287
 *
288
 */
2067 jermar 289
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
2436 jermar 290
    int flags, char *name, bool uncounted)
1 jermar 291
{
292
    thread_t *t;
822 palkovsky 293
    ipl_t ipl;
294
 
787 palkovsky 295
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 296
    if (!t)
297
        return NULL;
1 jermar 298
 
822 palkovsky 299
    /* Not needed, but good for debugging */
3104 svoboda 300
    memsetb(t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES, 0);
822 palkovsky 301
 
302
    ipl = interrupts_disable();
303
    spinlock_lock(&tidlock);
304
    t->tid = ++last_tid;
305
    spinlock_unlock(&tidlock);
306
    interrupts_restore(ipl);
307
 
308
    context_save(&t->saved_context);
2067 jermar 309
    context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
2087 jermar 310
        THREAD_STACK_SIZE);
822 palkovsky 311
 
312
    the_initialize((the_t *) t->kstack);
313
 
314
    ipl = interrupts_disable();
315
    t->saved_context.ipl = interrupts_read();
316
    interrupts_restore(ipl);
317
 
1066 jermar 318
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
3593 rimsky 319
    t->name[THREAD_NAME_BUFLEN - 1] = '\0';
1066 jermar 320
 
822 palkovsky 321
    t->thread_code = func;
322
    t->thread_arg = arg;
323
    t->ticks = -1;
2030 decky 324
    t->cycles = 0;
2042 decky 325
    t->uncounted = uncounted;
822 palkovsky 326
    t->priority = -1;       /* start in rq[0] */
327
    t->cpu = NULL;
1854 jermar 328
    t->flags = flags;
822 palkovsky 329
    t->state = Entering;
330
    t->call_me = NULL;
331
    t->call_me_with = NULL;
332
 
333
    timeout_initialize(&t->sleep_timeout);
1502 jermar 334
    t->sleep_interruptible = false;
822 palkovsky 335
    t->sleep_queue = NULL;
336
    t->timeout_pending = 0;
1288 jermar 337
 
338
    t->in_copy_from_uspace = false;
339
    t->in_copy_to_uspace = false;
1579 jermar 340
 
341
    t->interrupted = false;
1571 jermar 342
    t->detached = false;
343
    waitq_initialize(&t->join_wq);
344
 
822 palkovsky 345
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 346
 
822 palkovsky 347
    t->task = task;
348
 
860 decky 349
    t->fpu_context_exists = 0;
350
    t->fpu_context_engaged = 0;
1854 jermar 351
 
2502 jermar 352
    avltree_node_initialize(&t->threads_tree_node);
353
    t->threads_tree_node.key = (uintptr_t) t;
354
 
3492 rimsky 355
#ifdef CONFIG_UDEBUG
356
    /* Init debugging stuff */
357
    udebug_thread_initialize(&t->udebug);
358
#endif
359
 
2067 jermar 360
    /* might depend on previous initialization */
361
    thread_create_arch(t); 
2440 jermar 362
 
363
    if (!(flags & THREAD_FLAG_NOATTACH))
364
        thread_attach(t, task);
365
 
366
    return t;
367
}
368
 
369
/** Destroy thread memory structure
370
 *
371
 * Detach thread from all queues, cpus etc. and destroy it.
372
 *
373
 * Assume thread->lock is held!!
374
 */
375
void thread_destroy(thread_t *t)
376
{
2451 jermar 377
    ASSERT(t->state == Exiting || t->state == Lingering);
2440 jermar 378
    ASSERT(t->task);
379
    ASSERT(t->cpu);
380
 
381
    spinlock_lock(&t->cpu->lock);
382
    if (t->cpu->fpu_owner == t)
383
        t->cpu->fpu_owner = NULL;
384
    spinlock_unlock(&t->cpu->lock);
385
 
386
    spinlock_unlock(&t->lock);
387
 
388
    spinlock_lock(&threads_lock);
2502 jermar 389
    avltree_delete(&threads_tree, &t->threads_tree_node);
2440 jermar 390
    spinlock_unlock(&threads_lock);
391
 
392
    /*
393
     * Detach from the containing task.
394
     */
395
    spinlock_lock(&t->task->lock);
396
    list_remove(&t->th_link);
397
    spinlock_unlock(&t->task->lock);   
2446 jermar 398
 
399
    /*
400
     * t is guaranteed to be the very last thread of its task.
401
     * It is safe to destroy the task.
402
     */
403
    if (atomic_predec(&t->task->refcount) == 0)
2440 jermar 404
        task_destroy(t->task);
405
 
406
    slab_free(thread_slab, t);
407
}
408
 
409
/** Make the thread visible to the system.
410
 *
411
 * Attach the thread structure to the current task and make it visible in the
2502 jermar 412
 * threads_tree.
2440 jermar 413
 *
414
 * @param t Thread to be attached to the task.
415
 * @param task  Task to which the thread is to be attached.
416
 */
417
void thread_attach(thread_t *t, task_t *task)
418
{
419
    ipl_t ipl;
420
 
421
    /*
3492 rimsky 422
     * Attach to the specified task.
2440 jermar 423
     */
2446 jermar 424
    ipl = interrupts_disable();
2440 jermar 425
    spinlock_lock(&task->lock);
3492 rimsky 426
 
2446 jermar 427
    atomic_inc(&task->refcount);
3492 rimsky 428
 
429
    /* Must not count kbox thread into lifecount */
430
    if (t->flags & THREAD_FLAG_USPACE)
431
        atomic_inc(&task->lifecount);
432
 
1579 jermar 433
    list_append(&t->th_link, &task->th_head);
434
    spinlock_unlock(&task->lock);
435
 
436
    /*
822 palkovsky 437
     * Register this thread in the system-wide list.
438
     */
439
    spinlock_lock(&threads_lock);
2502 jermar 440
    avltree_insert(&threads_tree, &t->threads_tree_node);
822 palkovsky 441
    spinlock_unlock(&threads_lock);
442
 
443
    interrupts_restore(ipl);
1 jermar 444
}
445
 
1687 jermar 446
/** Terminate thread.
107 decky 447
 *
2067 jermar 448
 * End current thread execution and switch it to the exiting state. All pending
449
 * timeouts are executed.
107 decky 450
 */
1 jermar 451
void thread_exit(void)
452
{
413 jermar 453
    ipl_t ipl;
1 jermar 454
 
3492 rimsky 455
    if (THREAD->flags & THREAD_FLAG_USPACE) {
456
#ifdef CONFIG_UDEBUG
457
        /* Generate udebug THREAD_E event */
458
        udebug_thread_e_event();
459
#endif
460
        if (atomic_predec(&TASK->lifecount) == 0) {
461
            /*
462
             * We are the last userspace thread in the task that
463
             * still has not exited. With the exception of the
464
             * moment the task was created, new userspace threads
465
             * can only be created by threads of the same task.
466
             * We are safe to perform cleanup.
467
             */
2446 jermar 468
            ipc_cleanup();
3063 decky 469
            futex_cleanup();
470
            LOG("Cleanup of task %" PRIu64" completed.", TASK->taskid);
2446 jermar 471
        }
472
    }
473
 
1 jermar 474
restart:
413 jermar 475
    ipl = interrupts_disable();
15 jermar 476
    spinlock_lock(&THREAD->lock);
2067 jermar 477
    if (THREAD->timeout_pending) {
478
        /* busy waiting for timeouts in progress */
15 jermar 479
        spinlock_unlock(&THREAD->lock);
413 jermar 480
        interrupts_restore(ipl);
1 jermar 481
        goto restart;
482
    }
2446 jermar 483
 
15 jermar 484
    THREAD->state = Exiting;
485
    spinlock_unlock(&THREAD->lock);
1 jermar 486
    scheduler();
3549 rimsky 487
 
1595 palkovsky 488
    /* Not reached */
489
    while (1)
490
        ;
1 jermar 491
}
492
 
107 decky 493
 
494
/** Thread sleep
495
 *
496
 * Suspend execution of the current thread.
497
 *
498
 * @param sec Number of seconds to sleep.
499
 *
500
 */
1780 jermar 501
void thread_sleep(uint32_t sec)
1 jermar 502
{
2067 jermar 503
    thread_usleep(sec * 1000000);
1 jermar 504
}
107 decky 505
 
1571 jermar 506
/** Wait for another thread to exit.
507
 *
508
 * @param t Thread to join on exit.
509
 * @param usec Timeout in microseconds.
510
 * @param flags Mode of operation.
511
 *
512
 * @return An error code from errno.h or an error code from synch.h.
513
 */
1780 jermar 514
int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
1571 jermar 515
{
516
    ipl_t ipl;
517
    int rc;
518
 
519
    if (t == THREAD)
520
        return EINVAL;
521
 
522
    /*
523
     * Since thread join can only be called once on an undetached thread,
524
     * the thread pointer is guaranteed to be still valid.
525
     */
526
 
527
    ipl = interrupts_disable();
528
    spinlock_lock(&t->lock);
529
    ASSERT(!t->detached);
530
    spinlock_unlock(&t->lock);
1687 jermar 531
    interrupts_restore(ipl);
1571 jermar 532
 
1687 jermar 533
    rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
1571 jermar 534
 
535
    return rc; 
536
}
537
 
538
/** Detach thread.
539
 *
2451 jermar 540
 * Mark the thread as detached, if the thread is already in the Lingering
541
 * state, deallocate its resources.
1571 jermar 542
 *
543
 * @param t Thread to be detached.
544
 */
545
void thread_detach(thread_t *t)
546
{
547
    ipl_t ipl;
548
 
549
    /*
2183 jermar 550
     * Since the thread is expected not to be already detached,
1571 jermar 551
     * pointer to it must be still valid.
552
     */
553
    ipl = interrupts_disable();
554
    spinlock_lock(&t->lock);
555
    ASSERT(!t->detached);
2451 jermar 556
    if (t->state == Lingering) {
1571 jermar 557
        thread_destroy(t);  /* unlocks &t->lock */
558
        interrupts_restore(ipl);
559
        return;
560
    } else {
561
        t->detached = true;
562
    }
563
    spinlock_unlock(&t->lock);
564
    interrupts_restore(ipl);
565
}
566
 
107 decky 567
/** Thread usleep
568
 *
569
 * Suspend execution of the current thread.
570
 *
571
 * @param usec Number of microseconds to sleep.
572
 *
573
 */
1780 jermar 574
void thread_usleep(uint32_t usec)
1 jermar 575
{
576
    waitq_t wq;
577
 
578
    waitq_initialize(&wq);
579
 
1502 jermar 580
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
1 jermar 581
}
582
 
107 decky 583
/** Register thread out-of-context invocation
584
 *
585
 * Register a function and its argument to be executed
586
 * on next context switch to the current thread.
587
 *
588
 * @param call_me      Out-of-context function.
589
 * @param call_me_with Out-of-context function argument.
590
 *
591
 */
1 jermar 592
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
593
{
413 jermar 594
    ipl_t ipl;
1 jermar 595
 
413 jermar 596
    ipl = interrupts_disable();
15 jermar 597
    spinlock_lock(&THREAD->lock);
598
    THREAD->call_me = call_me;
599
    THREAD->call_me_with = call_me_with;
600
    spinlock_unlock(&THREAD->lock);
413 jermar 601
    interrupts_restore(ipl);
1 jermar 602
}
777 palkovsky 603
 
2504 jermar 604
static bool thread_walker(avltree_node_t *node, void *arg)
2502 jermar 605
{
3063 decky 606
    thread_t *t = avltree_get_instance(node, thread_t, threads_tree_node);
607
 
2502 jermar 608
    uint64_t cycles;
609
    char suffix;
610
    order(t->cycles, &cycles, &suffix);
3063 decky 611
 
612
#ifdef __32_BITS__
613
    printf("%-6" PRIu64" %-10s %10p %-8s %10p %-3" PRIu32 " %10p %10p %9" PRIu64 "%c ",
614
        t->tid, t->name, t, thread_states[t->state], t->task,
615
        t->task->context, t->thread_code, t->kstack, cycles, suffix);
616
#endif
617
 
618
#ifdef __64_BITS__
619
    printf("%-6" PRIu64" %-10s %18p %-8s %18p %-3" PRIu32 " %18p %18p %9" PRIu64 "%c ",
620
        t->tid, t->name, t, thread_states[t->state], t->task,
621
        t->task->context, t->thread_code, t->kstack, cycles, suffix);
622
#endif
2502 jermar 623
 
624
    if (t->cpu)
3063 decky 625
        printf("%-4u", t->cpu->id);
2502 jermar 626
    else
627
        printf("none");
628
 
2712 decky 629
    if (t->state == Sleeping) {
3063 decky 630
#ifdef __32_BITS__
631
        printf(" %10p", t->sleep_queue);
632
#endif
633
 
634
#ifdef __64_BITS__
635
        printf(" %18p", t->sleep_queue);
636
#endif
2712 decky 637
    }
2502 jermar 638
 
639
    printf("\n");
2504 jermar 640
 
641
    return true;
2502 jermar 642
}
643
 
777 palkovsky 644
/** Print list of threads debug info */
645
void thread_print_list(void)
646
{
647
    ipl_t ipl;
648
 
649
    /* Messing with thread structures, avoid deadlock */
650
    ipl = interrupts_disable();
651
    spinlock_lock(&threads_lock);
652
 
3063 decky 653
#ifdef __32_BITS__  
654
    printf("tid    name       address    state    task       "
655
        "ctx code       stack      cycles     cpu  "
656
        "waitqueue\n");
657
    printf("------ ---------- ---------- -------- ---------- "
658
        "--- ---------- ---------- ---------- ---- "
659
        "----------\n");
660
#endif
661
 
662
#ifdef __64_BITS__
663
    printf("tid    name       address            state    task               "
664
        "ctx code               stack              cycles     cpu  "
665
        "waitqueue\n");
666
    printf("------ ---------- ------------------ -------- ------------------ "
667
        "--- ------------------ ------------------ ---------- ---- "
668
        "------------------\n");
669
#endif
670
 
2504 jermar 671
    avltree_walk(&threads_tree, thread_walker, NULL);
1158 jermar 672
 
777 palkovsky 673
    spinlock_unlock(&threads_lock);
1060 palkovsky 674
    interrupts_restore(ipl);
777 palkovsky 675
}
1066 jermar 676
 
1158 jermar 677
/** Check whether thread exists.
678
 *
679
 * Note that threads_lock must be already held and
680
 * interrupts must be already disabled.
681
 *
682
 * @param t Pointer to thread.
683
 *
684
 * @return True if thread t is known to the system, false otherwise.
685
 */
686
bool thread_exists(thread_t *t)
687
{
2502 jermar 688
    avltree_node_t *node;
689
 
690
    node = avltree_search(&threads_tree, (avltree_key_t) ((uintptr_t) t));
1158 jermar 691
 
2502 jermar 692
    return node != NULL;
1158 jermar 693
}
694
 
2030 decky 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,
3593 rimsky 712
    size_t name_len, 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
 
3593 rimsky 719
    if (name_len > THREAD_NAME_BUFLEN - 1)
720
        name_len = THREAD_NAME_BUFLEN - 1;
721
 
722
    rc = copy_from_uspace(namebuf, uspace_name, name_len);
1288 jermar 723
    if (rc != 0)
1780 jermar 724
        return (unative_t) rc;
1066 jermar 725
 
3593 rimsky 726
    namebuf[name_len] = '\0';
727
 
2470 jermar 728
    /*
729
     * In case of failure, kernel_uarg will be deallocated in this function.
730
     * In case of success, kernel_uarg will be freed in uinit().
731
     */
732
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
733
 
1288 jermar 734
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
735
    if (rc != 0) {
736
        free(kernel_uarg);
1780 jermar 737
        return (unative_t) rc;
1288 jermar 738
    }
1078 jermar 739
 
2440 jermar 740
    t = thread_create(uinit, kernel_uarg, TASK,
741
        THREAD_FLAG_USPACE | THREAD_FLAG_NOATTACH, namebuf, false);
2087 jermar 742
    if (t) {
2440 jermar 743
        if (uspace_thread_id != NULL) {
744
            int rc;
745
 
746
            rc = copy_to_uspace(uspace_thread_id, &t->tid,
747
                sizeof(t->tid));
748
            if (rc != 0) {
749
                /*
750
                 * We have encountered a failure, but the thread
751
                 * has already been created. We need to undo its
752
                 * creation now.
753
                 */
754
 
755
                /*
2446 jermar 756
                 * The new thread structure is initialized, but
757
                 * is still not visible to the system.
2440 jermar 758
                 * We can safely deallocate it.
759
                 */
760
                slab_free(thread_slab, t);
761
                free(kernel_uarg);
762
 
763
                return (unative_t) rc;
764
             }
765
        }
3665 rimsky 766
#ifdef CONFIG_UDEBUG
767
        /*
768
         * Generate udebug THREAD_B event and attach the thread.
769
         * This must be done atomically (with the debug locks held),
770
         * otherwise we would either miss some thread or receive
771
         * THREAD_B events for threads that already existed
772
         * and could be detected with THREAD_READ before.
773
         */
774
        udebug_thread_b_event_attach(t, TASK);
775
#else
2440 jermar 776
        thread_attach(t, TASK);
3665 rimsky 777
#endif
1210 vana 778
        thread_ready(t);
2440 jermar 779
 
780
        return 0;
2216 decky 781
    } else
1078 jermar 782
        free(kernel_uarg);
1066 jermar 783
 
1780 jermar 784
    return (unative_t) ENOMEM;
1066 jermar 785
}
786
 
787
/** Process syscall to terminate thread.
788
 *
789
 */
1780 jermar 790
unative_t sys_thread_exit(int uspace_status)
1066 jermar 791
{
1210 vana 792
    thread_exit();
793
    /* Unreachable */
794
    return 0;
1066 jermar 795
}
1702 cejka 796
 
2187 decky 797
/** Syscall for getting TID.
798
 *
2216 decky 799
 * @param uspace_thread_id Userspace address of 8-byte buffer where to store
800
 * current thread ID.
801
 *
802
 * @return 0 on success or an error code from @ref errno.h.
2187 decky 803
 */
2216 decky 804
unative_t sys_thread_get_id(thread_id_t *uspace_thread_id)
2187 decky 805
{
806
    /*
807
     * No need to acquire lock on THREAD because tid
808
     * remains constant for the lifespan of the thread.
809
     */
2216 decky 810
    return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid,
811
        sizeof(THREAD->tid));
2187 decky 812
}
813
 
1757 jermar 814
/** @}
1702 cejka 815
 */