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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>
1158 jermar 54
#include <adt/btree.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
 
1571 jermar 72
/** Thread states */
73
char *thread_states[] = {
74
    "Invalid",
75
    "Running",
76
    "Sleeping",
77
    "Ready",
78
    "Entering",
79
    "Exiting",
80
    "Undead"
81
};
82
 
2067 jermar 83
/** Lock protecting the threads_btree B+tree.
84
 *
85
 * For locking rules, see declaration thereof.
86
 */
1158 jermar 87
SPINLOCK_INITIALIZE(threads_lock);
1 jermar 88
 
1636 jermar 89
/** B+tree of all threads.
90
 *
2067 jermar 91
 * When a thread is found in the threads_btree B+tree, it is guaranteed to
92
 * exist as long as the threads_lock is held.
1636 jermar 93
 */
94
btree_t threads_btree;     
95
 
623 jermar 96
SPINLOCK_INITIALIZE(tidlock);
1780 jermar 97
uint32_t last_tid = 0;
1 jermar 98
 
787 palkovsky 99
static slab_cache_t *thread_slab;
906 palkovsky 100
#ifdef ARCH_HAS_FPU
101
slab_cache_t *fpu_context_slab;
102
#endif
107 decky 103
 
2067 jermar 104
/** Thread wrapper.
107 decky 105
 *
2067 jermar 106
 * This wrapper is provided to ensure that every thread makes a call to
107
 * thread_exit() when its implementing function returns.
1 jermar 108
 *
413 jermar 109
 * interrupts_disable() is assumed.
107 decky 110
 *
1 jermar 111
 */
452 decky 112
static void cushion(void)
1 jermar 113
{
15 jermar 114
    void (*f)(void *) = THREAD->thread_code;
115
    void *arg = THREAD->thread_arg;
2032 decky 116
    THREAD->last_cycle = get_cycle();
1 jermar 117
 
2039 decky 118
    /* This is where each thread wakes up after its creation */
15 jermar 119
    spinlock_unlock(&THREAD->lock);
413 jermar 120
    interrupts_enable();
1 jermar 121
 
122
    f(arg);
2039 decky 123
 
124
    /* Accumulate accounting to the task */
125
    ipl_t ipl = interrupts_disable();
126
 
127
    spinlock_lock(&THREAD->lock);
2042 decky 128
    if (!THREAD->uncounted) {
129
        thread_update_accounting();
130
        uint64_t cycles = THREAD->cycles;
131
        THREAD->cycles = 0;
132
        spinlock_unlock(&THREAD->lock);
133
 
134
        spinlock_lock(&TASK->lock);
135
        TASK->cycles += cycles;
136
        spinlock_unlock(&TASK->lock);
137
    } else
138
        spinlock_unlock(&THREAD->lock);
2039 decky 139
 
140
    interrupts_restore(ipl);
141
 
1 jermar 142
    thread_exit();
143
    /* not reached */
144
}
145
 
787 palkovsky 146
/** Initialization and allocation for thread_t structure */
147
static int thr_constructor(void *obj, int kmflags)
148
{
1820 decky 149
    thread_t *t = (thread_t *) obj;
107 decky 150
 
787 palkovsky 151
    spinlock_initialize(&t->lock, "thread_t_lock");
152
    link_initialize(&t->rq_link);
153
    link_initialize(&t->wq_link);
154
    link_initialize(&t->th_link);
1854 jermar 155
 
156
    /* call the architecture-specific part of the constructor */
157
    thr_constructor_arch(t);
787 palkovsky 158
 
906 palkovsky 159
#ifdef ARCH_HAS_FPU
160
#  ifdef CONFIG_FPU_LAZY
161
    t->saved_fpu_context = NULL;
162
#  else
163
    t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
164
    if (!t->saved_fpu_context)
165
        return -1;
166
#  endif
167
#endif  
168
 
2118 decky 169
    t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags);
1766 palkovsky 170
    if (! t->kstack) {
906 palkovsky 171
#ifdef ARCH_HAS_FPU
172
        if (t->saved_fpu_context)
173
            slab_free(fpu_context_slab,t->saved_fpu_context);
174
#endif
842 palkovsky 175
        return -1;
906 palkovsky 176
    }
787 palkovsky 177
 
178
    return 0;
179
}
180
 
181
/** Destruction of thread_t object */
182
static int thr_destructor(void *obj)
183
{
1820 decky 184
    thread_t *t = (thread_t *) obj;
787 palkovsky 185
 
1854 jermar 186
    /* call the architecture-specific part of the destructor */
187
    thr_destructor_arch(t);
188
 
1760 palkovsky 189
    frame_free(KA2PA(t->kstack));
906 palkovsky 190
#ifdef ARCH_HAS_FPU
191
    if (t->saved_fpu_context)
192
        slab_free(fpu_context_slab,t->saved_fpu_context);
193
#endif
787 palkovsky 194
    return 1; /* One page freed */
195
}
196
 
107 decky 197
/** Initialize threads
198
 *
199
 * Initialize kernel threads support.
200
 *
201
 */
1 jermar 202
void thread_init(void)
203
{
15 jermar 204
    THREAD = NULL;
625 palkovsky 205
    atomic_set(&nrdy,0);
2067 jermar 206
    thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
2087 jermar 207
        thr_constructor, thr_destructor, 0);
2067 jermar 208
 
906 palkovsky 209
#ifdef ARCH_HAS_FPU
2067 jermar 210
    fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
2087 jermar 211
        FPU_CONTEXT_ALIGN, NULL, NULL, 0);
906 palkovsky 212
#endif
1158 jermar 213
 
214
    btree_create(&threads_btree);
1 jermar 215
}
216
 
107 decky 217
/** Make thread ready
218
 *
219
 * Switch thread t to the ready state.
220
 *
221
 * @param t Thread to make ready.
222
 *
223
 */
1 jermar 224
void thread_ready(thread_t *t)
225
{
226
    cpu_t *cpu;
227
    runq_t *r;
413 jermar 228
    ipl_t ipl;
625 palkovsky 229
    int i, avg;
1 jermar 230
 
413 jermar 231
    ipl = interrupts_disable();
1 jermar 232
 
233
    spinlock_lock(&t->lock);
234
 
1086 palkovsky 235
    ASSERT(! (t->state == Ready));
236
 
2067 jermar 237
    i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;
1 jermar 238
 
16 jermar 239
    cpu = CPU;
1854 jermar 240
    if (t->flags & THREAD_FLAG_WIRED) {
1 jermar 241
        cpu = t->cpu;
242
    }
1083 palkovsky 243
    t->state = Ready;
1 jermar 244
    spinlock_unlock(&t->lock);
245
 
107 decky 246
    /*
1 jermar 247
     * Append t to respective ready queue on respective processor.
248
     */
249
    r = &cpu->rq[i];
250
    spinlock_lock(&r->lock);
251
    list_append(&t->rq_link, &r->rq_head);
252
    r->n++;
253
    spinlock_unlock(&r->lock);
254
 
475 jermar 255
    atomic_inc(&nrdy);
625 palkovsky 256
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 257
    atomic_inc(&cpu->nrdy);
1 jermar 258
 
413 jermar 259
    interrupts_restore(ipl);
1 jermar 260
}
261
 
787 palkovsky 262
/** Destroy thread memory structure
263
 *
264
 * Detach thread from all queues, cpus etc. and destroy it.
265
 *
266
 * Assume thread->lock is held!!
267
 */
268
void thread_destroy(thread_t *t)
269
{
2067 jermar 270
    bool destroy_task = false;
1579 jermar 271
 
1581 jermar 272
    ASSERT(t->state == Exiting || t->state == Undead);
787 palkovsky 273
    ASSERT(t->task);
274
    ASSERT(t->cpu);
275
 
276
    spinlock_lock(&t->cpu->lock);
2067 jermar 277
    if(t->cpu->fpu_owner == t)
278
        t->cpu->fpu_owner = NULL;
787 palkovsky 279
    spinlock_unlock(&t->cpu->lock);
280
 
1579 jermar 281
    spinlock_unlock(&t->lock);
282
 
283
    spinlock_lock(&threads_lock);
1780 jermar 284
    btree_remove(&threads_btree, (btree_key_t) ((uintptr_t ) t), NULL);
1579 jermar 285
    spinlock_unlock(&threads_lock);
286
 
787 palkovsky 287
    /*
288
     * Detach from the containing task.
289
     */
290
    spinlock_lock(&t->task->lock);
291
    list_remove(&t->th_link);
1579 jermar 292
    if (--t->task->refcount == 0) {
293
        t->task->accept_new_threads = false;
294
        destroy_task = true;
295
    }
296
    spinlock_unlock(&t->task->lock);   
787 palkovsky 297
 
1579 jermar 298
    if (destroy_task)
299
        task_destroy(t->task);
787 palkovsky 300
 
301
    slab_free(thread_slab, t);
302
}
303
 
107 decky 304
/** Create new thread
305
 *
306
 * Create a new thread.
307
 *
2042 decky 308
 * @param func      Thread's implementing function.
309
 * @param arg       Thread's implementing function argument.
310
 * @param task      Task to which the thread belongs.
311
 * @param flags     Thread flags.
312
 * @param name      Symbolic name.
2067 jermar 313
 * @param uncounted Thread's accounting doesn't affect accumulated task
314
 *   accounting.
107 decky 315
 *
316
 * @return New thread's structure on success, NULL on failure.
317
 *
318
 */
2067 jermar 319
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
320
    int flags, char *name, bool uncounted)
1 jermar 321
{
322
    thread_t *t;
822 palkovsky 323
    ipl_t ipl;
324
 
787 palkovsky 325
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 326
    if (!t)
327
        return NULL;
1 jermar 328
 
822 palkovsky 329
    /* Not needed, but good for debugging */
2067 jermar 330
    memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES,
2087 jermar 331
        0);
822 palkovsky 332
 
333
    ipl = interrupts_disable();
334
    spinlock_lock(&tidlock);
335
    t->tid = ++last_tid;
336
    spinlock_unlock(&tidlock);
337
    interrupts_restore(ipl);
338
 
339
    context_save(&t->saved_context);
2067 jermar 340
    context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
2087 jermar 341
        THREAD_STACK_SIZE);
822 palkovsky 342
 
343
    the_initialize((the_t *) t->kstack);
344
 
345
    ipl = interrupts_disable();
346
    t->saved_context.ipl = interrupts_read();
347
    interrupts_restore(ipl);
348
 
1066 jermar 349
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
350
 
822 palkovsky 351
    t->thread_code = func;
352
    t->thread_arg = arg;
353
    t->ticks = -1;
2030 decky 354
    t->cycles = 0;
2042 decky 355
    t->uncounted = uncounted;
822 palkovsky 356
    t->priority = -1;       /* start in rq[0] */
357
    t->cpu = NULL;
1854 jermar 358
    t->flags = flags;
822 palkovsky 359
    t->state = Entering;
360
    t->call_me = NULL;
361
    t->call_me_with = NULL;
362
 
363
    timeout_initialize(&t->sleep_timeout);
1502 jermar 364
    t->sleep_interruptible = false;
822 palkovsky 365
    t->sleep_queue = NULL;
366
    t->timeout_pending = 0;
1288 jermar 367
 
368
    t->in_copy_from_uspace = false;
369
    t->in_copy_to_uspace = false;
1579 jermar 370
 
371
    t->interrupted = false;
1661 jermar 372
    t->join_type = None;
1571 jermar 373
    t->detached = false;
374
    waitq_initialize(&t->join_wq);
375
 
822 palkovsky 376
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 377
 
822 palkovsky 378
    t->task = task;
379
 
860 decky 380
    t->fpu_context_exists = 0;
381
    t->fpu_context_engaged = 0;
1854 jermar 382
 
2067 jermar 383
    /* might depend on previous initialization */
384
    thread_create_arch(t); 
822 palkovsky 385
 
386
    /*
1579 jermar 387
     * Attach to the containing task.
388
     */
1687 jermar 389
    ipl = interrupts_disable();  
1579 jermar 390
    spinlock_lock(&task->lock);
391
    if (!task->accept_new_threads) {
392
        spinlock_unlock(&task->lock);
393
        slab_free(thread_slab, t);
1687 jermar 394
        interrupts_restore(ipl);
1579 jermar 395
        return NULL;
396
    }
397
    list_append(&t->th_link, &task->th_head);
1585 jermar 398
    if (task->refcount++ == 0)
399
        task->main_thread = t;
1579 jermar 400
    spinlock_unlock(&task->lock);
401
 
402
    /*
822 palkovsky 403
     * Register this thread in the system-wide list.
404
     */
405
    spinlock_lock(&threads_lock);
2067 jermar 406
    btree_insert(&threads_btree, (btree_key_t) ((uintptr_t) t), (void *) t,
2087 jermar 407
        NULL);
822 palkovsky 408
    spinlock_unlock(&threads_lock);
409
 
410
    interrupts_restore(ipl);
860 decky 411
 
1 jermar 412
    return t;
413
}
414
 
1687 jermar 415
/** Terminate thread.
107 decky 416
 *
2067 jermar 417
 * End current thread execution and switch it to the exiting state. All pending
418
 * timeouts are executed.
107 decky 419
 */
1 jermar 420
void thread_exit(void)
421
{
413 jermar 422
    ipl_t ipl;
1 jermar 423
 
424
restart:
413 jermar 425
    ipl = interrupts_disable();
15 jermar 426
    spinlock_lock(&THREAD->lock);
2067 jermar 427
    if (THREAD->timeout_pending) {
428
        /* busy waiting for timeouts in progress */
15 jermar 429
        spinlock_unlock(&THREAD->lock);
413 jermar 430
        interrupts_restore(ipl);
1 jermar 431
        goto restart;
432
    }
15 jermar 433
    THREAD->state = Exiting;
434
    spinlock_unlock(&THREAD->lock);
1 jermar 435
    scheduler();
1595 palkovsky 436
 
437
    /* Not reached */
438
    while (1)
439
        ;
1 jermar 440
}
441
 
107 decky 442
 
443
/** Thread sleep
444
 *
445
 * Suspend execution of the current thread.
446
 *
447
 * @param sec Number of seconds to sleep.
448
 *
449
 */
1780 jermar 450
void thread_sleep(uint32_t sec)
1 jermar 451
{
2067 jermar 452
    thread_usleep(sec * 1000000);
1 jermar 453
}
107 decky 454
 
1571 jermar 455
/** Wait for another thread to exit.
456
 *
457
 * @param t Thread to join on exit.
458
 * @param usec Timeout in microseconds.
459
 * @param flags Mode of operation.
460
 *
461
 * @return An error code from errno.h or an error code from synch.h.
462
 */
1780 jermar 463
int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
1571 jermar 464
{
465
    ipl_t ipl;
466
    int rc;
467
 
468
    if (t == THREAD)
469
        return EINVAL;
470
 
471
    /*
472
     * Since thread join can only be called once on an undetached thread,
473
     * the thread pointer is guaranteed to be still valid.
474
     */
475
 
476
    ipl = interrupts_disable();
477
    spinlock_lock(&t->lock);
478
    ASSERT(!t->detached);
479
    spinlock_unlock(&t->lock);
1687 jermar 480
    interrupts_restore(ipl);
1571 jermar 481
 
1687 jermar 482
    rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
1571 jermar 483
 
484
    return rc; 
485
}
486
 
487
/** Detach thread.
488
 *
489
 * Mark the thread as detached, if the thread is already in the Undead state,
490
 * deallocate its resources.
491
 *
492
 * @param t Thread to be detached.
493
 */
494
void thread_detach(thread_t *t)
495
{
496
    ipl_t ipl;
497
 
498
    /*
499
     * Since the thread is expected to not be already detached,
500
     * pointer to it must be still valid.
501
     */
502
    ipl = interrupts_disable();
503
    spinlock_lock(&t->lock);
504
    ASSERT(!t->detached);
505
    if (t->state == Undead) {
506
        thread_destroy(t);  /* unlocks &t->lock */
507
        interrupts_restore(ipl);
508
        return;
509
    } else {
510
        t->detached = true;
511
    }
512
    spinlock_unlock(&t->lock);
513
    interrupts_restore(ipl);
514
}
515
 
107 decky 516
/** Thread usleep
517
 *
518
 * Suspend execution of the current thread.
519
 *
520
 * @param usec Number of microseconds to sleep.
521
 *
522
 */
1780 jermar 523
void thread_usleep(uint32_t usec)
1 jermar 524
{
525
    waitq_t wq;
526
 
527
    waitq_initialize(&wq);
528
 
1502 jermar 529
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
1 jermar 530
}
531
 
107 decky 532
/** Register thread out-of-context invocation
533
 *
534
 * Register a function and its argument to be executed
535
 * on next context switch to the current thread.
536
 *
537
 * @param call_me      Out-of-context function.
538
 * @param call_me_with Out-of-context function argument.
539
 *
540
 */
1 jermar 541
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
542
{
413 jermar 543
    ipl_t ipl;
1 jermar 544
 
413 jermar 545
    ipl = interrupts_disable();
15 jermar 546
    spinlock_lock(&THREAD->lock);
547
    THREAD->call_me = call_me;
548
    THREAD->call_me_with = call_me_with;
549
    spinlock_unlock(&THREAD->lock);
413 jermar 550
    interrupts_restore(ipl);
1 jermar 551
}
777 palkovsky 552
 
553
/** Print list of threads debug info */
554
void thread_print_list(void)
555
{
556
    link_t *cur;
557
    ipl_t ipl;
558
 
559
    /* Messing with thread structures, avoid deadlock */
560
    ipl = interrupts_disable();
561
    spinlock_lock(&threads_lock);
2030 decky 562
 
2087 jermar 563
    printf("tid    name       address    state    task       ctx code    "
564
        "   stack      cycles     cpu  kstack     waitqueue\n");
565
    printf("------ ---------- ---------- -------- ---------- --- --------"
566
        "-- ---------- ---------- ---- ---------- ----------\n");
777 palkovsky 567
 
2087 jermar 568
    for (cur = threads_btree.leaf_head.next;
569
        cur != &threads_btree.leaf_head; cur = cur->next) {
1158 jermar 570
        btree_node_t *node;
2118 decky 571
        unsigned int i;
1158 jermar 572
 
573
        node = list_get_instance(cur, btree_node_t, leaf_link);
574
        for (i = 0; i < node->keys; i++) {
575
            thread_t *t;
576
 
577
            t = (thread_t *) node->value[i];
2030 decky 578
 
579
            uint64_t cycles;
580
            char suffix;
2050 decky 581
            order(t->cycles, &cycles, &suffix);
2030 decky 582
 
2087 jermar 583
            printf("%-6zd %-10s %#10zx %-8s %#10zx %-3ld %#10zx "
584
                "%#10zx %9llu%c ", t->tid, t->name, t,
585
                thread_states[t->state], t->task, t->task->context,
586
                t->thread_code, t->kstack, cycles, suffix);
2030 decky 587
 
1158 jermar 588
            if (t->cpu)
2030 decky 589
                printf("%-4zd", t->cpu->id);
1158 jermar 590
            else
591
                printf("none");
2030 decky 592
 
593
            if (t->state == Sleeping)
2087 jermar 594
                printf(" %#10zx %#10zx", t->kstack,
595
                    t->sleep_queue);
2030 decky 596
 
1158 jermar 597
            printf("\n");
598
        }
777 palkovsky 599
    }
600
 
601
    spinlock_unlock(&threads_lock);
1060 palkovsky 602
    interrupts_restore(ipl);
777 palkovsky 603
}
1066 jermar 604
 
1158 jermar 605
/** Check whether thread exists.
606
 *
607
 * Note that threads_lock must be already held and
608
 * interrupts must be already disabled.
609
 *
610
 * @param t Pointer to thread.
611
 *
612
 * @return True if thread t is known to the system, false otherwise.
613
 */
614
bool thread_exists(thread_t *t)
615
{
616
    btree_node_t *leaf;
617
 
2087 jermar 618
    return btree_search(&threads_btree, (btree_key_t) ((uintptr_t) t),
619
        &leaf) != NULL;
1158 jermar 620
}
621
 
2030 decky 622
 
623
/** Update accounting of current thread.
624
 *
625
 * Note that thread_lock on THREAD must be already held and
626
 * interrupts must be already disabled.
627
 *
628
 */
629
void thread_update_accounting(void)
630
{
631
    uint64_t time = get_cycle();
632
    THREAD->cycles += time - THREAD->last_cycle;
633
    THREAD->last_cycle = time;
634
}
635
 
1066 jermar 636
/** Process syscall to create new thread.
637
 *
638
 */
1780 jermar 639
unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name)
1066 jermar 640
{
1210 vana 641
    thread_t *t;
642
    char namebuf[THREAD_NAME_BUFLEN];
1103 jermar 643
    uspace_arg_t *kernel_uarg;
1780 jermar 644
    uint32_t tid;
1288 jermar 645
    int rc;
1066 jermar 646
 
1288 jermar 647
    rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
648
    if (rc != 0)
1780 jermar 649
        return (unative_t) rc;
1066 jermar 650
 
1078 jermar 651
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
1288 jermar 652
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
653
    if (rc != 0) {
654
        free(kernel_uarg);
1780 jermar 655
        return (unative_t) rc;
1288 jermar 656
    }
1078 jermar 657
 
2087 jermar 658
    t = thread_create(uinit, kernel_uarg, TASK, THREAD_FLAG_USPACE, namebuf,
659
        false);
660
    if (t) {
1066 jermar 661
        tid = t->tid;
1210 vana 662
        thread_ready(t);
1780 jermar 663
        return (unative_t) tid;
1210 vana 664
    } else {
1078 jermar 665
        free(kernel_uarg);
1210 vana 666
    }
1066 jermar 667
 
1780 jermar 668
    return (unative_t) ENOMEM;
1066 jermar 669
}
670
 
671
/** Process syscall to terminate thread.
672
 *
673
 */
1780 jermar 674
unative_t sys_thread_exit(int uspace_status)
1066 jermar 675
{
1210 vana 676
    thread_exit();
677
    /* Unreachable */
678
    return 0;
1066 jermar 679
}
1702 cejka 680
 
1757 jermar 681
/** @}
1702 cejka 682
 */
2087 jermar 683