WebSVN – HelenOS – Diff – /trunk/kernel/generic/src/proc/thread.c


/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup genericproc
 * @{
 */
 
/**
 * @file
 * @brief   Thread management functions.
 */
 
#include <proc/scheduler.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <proc/uarg.h>
#include <mm/frame.h>
#include <mm/page.h>
#include <arch/asm.h>
#include <arch/cycle.h>
#include <arch.h>
#include <synch/synch.h>
#include <synch/spinlock.h>
#include <synch/waitq.h>
#include <synch/rwlock.h>
#include <cpu.h>
#include <func.h>
#include <context.h>
#include <adt/btree.h>
#include <adt/list.h>
#include <typedefs.h>
#include <time/clock.h>
#include <config.h>
#include <arch/interrupt.h>
#include <smp/ipi.h>
#include <arch/faddr.h>
#include <atomic.h>
#include <memstr.h>
#include <print.h>
#include <mm/slab.h>
#include <debug.h>
#include <main/uinit.h>
#include <syscall/copy.h>
#include <errno.h>
 
 
/** Thread states */
char *thread_states[] = {
    "Invalid",
    "Running",
    "Sleeping",
    "Ready",
    "Entering",
    "Exiting",
    "Undead"
};
 
/** Lock protecting the threads_btree B+tree.
 *
 * For locking rules, see declaration thereof.
 */
SPINLOCK_INITIALIZE(threads_lock);
 
/** B+tree of all threads.
 *
 * When a thread is found in the threads_btree B+tree, it is guaranteed to
 * exist as long as the threads_lock is held.
 */
btree_t threads_btree;     
 
SPINLOCK_INITIALIZE(tidlock);
uint32_t last_tid = 0;
 
static slab_cache_t *thread_slab;
#ifdef ARCH_HAS_FPU
slab_cache_t *fpu_context_slab;
#endif
 
/** Thread wrapper.
 *
 * This wrapper is provided to ensure that every thread makes a call to
 * thread_exit() when its implementing function returns.
 *
 * interrupts_disable() is assumed.
 *
 */
static void cushion(void)
{
    void (*f)(void *) = THREAD->thread_code;
    void *arg = THREAD->thread_arg;
    THREAD->last_cycle = get_cycle();
 
    /* This is where each thread wakes up after its creation */
    spinlock_unlock(&THREAD->lock);
    interrupts_enable();
 
    f(arg);
   
    /* Accumulate accounting to the task */
    ipl_t ipl = interrupts_disable();
   
    spinlock_lock(&THREAD->lock);
    if (!THREAD->uncounted) {
        thread_update_accounting();
        uint64_t cycles = THREAD->cycles;
        THREAD->cycles = 0;
        spinlock_unlock(&THREAD->lock);
       
        spinlock_lock(&TASK->lock);
        TASK->cycles += cycles;
        spinlock_unlock(&TASK->lock);
    } else
        spinlock_unlock(&THREAD->lock);
   
    interrupts_restore(ipl);
   
    thread_exit();
    /* not reached */
}
 
/** Initialization and allocation for thread_t structure */
static int thr_constructor(void *obj, int kmflags)
{
    thread_t *t = (thread_t *) obj;
 
    spinlock_initialize(&t->lock, "thread_t_lock");
    link_initialize(&t->rq_link);
    link_initialize(&t->wq_link);
    link_initialize(&t->th_link);
 
    /* call the architecture-specific part of the constructor */
    thr_constructor_arch(t);
   
#ifdef ARCH_HAS_FPU
#  ifdef CONFIG_FPU_LAZY
    t->saved_fpu_context = NULL;
#  else
    t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
    if (!t->saved_fpu_context)
        return -1;
#  endif
#endif  
 
    t->kstack = frame_alloc(STACK_FRAMES, FRAME_KA | kmflags);
    if (! t->kstack) {
#ifdef ARCH_HAS_FPU
        if (t->saved_fpu_context)
            slab_free(fpu_context_slab,t->saved_fpu_context);
#endif
        return -1;
    }
 
    return 0;
}
 
/** Destruction of thread_t object */
static int thr_destructor(void *obj)
{
    thread_t *t = (thread_t *) obj;
 
    /* call the architecture-specific part of the destructor */
    thr_destructor_arch(t);
 
    frame_free(KA2PA(t->kstack));
#ifdef ARCH_HAS_FPU
    if (t->saved_fpu_context)
        slab_free(fpu_context_slab,t->saved_fpu_context);
#endif
    return 1; /* One page freed */
}
 
/** Initialize threads
 *
 * Initialize kernel threads support.
 *
 */
void thread_init(void)
{
    THREAD = NULL;
    atomic_set(&nrdy,0);
    thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
        thr_constructor, thr_destructor, 0);
 
#ifdef ARCH_HAS_FPU
    fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
        FPU_CONTEXT_ALIGN, NULL, NULL, 0);
#endif
 
    btree_create(&threads_btree);
}
 
/** Make thread ready
 *
 * Switch thread t to the ready state.
 *
 * @param t Thread to make ready.
 *
 */
void thread_ready(thread_t *t)
{
    cpu_t *cpu;
    runq_t *r;
    ipl_t ipl;
    int i, avg;
 
    ipl = interrupts_disable();
 
    spinlock_lock(&t->lock);
 
    ASSERT(! (t->state == Ready));
 
    i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;
   
    cpu = CPU;
    if (t->flags & THREAD_FLAG_WIRED) {
        cpu = t->cpu;
    }
    t->state = Ready;
    spinlock_unlock(&t->lock);
   
    /*
     * Append t to respective ready queue on respective processor.
     */
    r = &cpu->rq[i];
    spinlock_lock(&r->lock);
    list_append(&t->rq_link, &r->rq_head);
    r->n++;
    spinlock_unlock(&r->lock);
 
    atomic_inc(&nrdy);
    avg = atomic_get(&nrdy) / config.cpu_active;
    atomic_inc(&cpu->nrdy);
 
    interrupts_restore(ipl);
}
 
/** Destroy thread memory structure
 *
 * Detach thread from all queues, cpus etc. and destroy it.
 *
 * Assume thread->lock is held!!
 */
void thread_destroy(thread_t *t)
{
    bool destroy_task = false;
 
    ASSERT(t->state == Exiting || t->state == Undead);
    ASSERT(t->task);
    ASSERT(t->cpu);
 
    spinlock_lock(&t->cpu->lock);
    if(t->cpu->fpu_owner == t)
        t->cpu->fpu_owner = NULL;
    spinlock_unlock(&t->cpu->lock);
 
    spinlock_unlock(&t->lock);
 
    spinlock_lock(&threads_lock);
    btree_remove(&threads_btree, (btree_key_t) ((uintptr_t ) t), NULL);
    spinlock_unlock(&threads_lock);
 
    /*
     * Detach from the containing task.
     */
    spinlock_lock(&t->task->lock);
    list_remove(&t->th_link);
    if (--t->task->refcount == 0) {
        t->task->accept_new_threads = false;
        destroy_task = true;
    }
    spinlock_unlock(&t->task->lock);   
   
    if (destroy_task)
        task_destroy(t->task);
   
    slab_free(thread_slab, t);
}
 
/** Create new thread
 *
 * Create a new thread.
 *
 * @param func      Thread's implementing function.
 * @param arg       Thread's implementing function argument.
 * @param task      Task to which the thread belongs.
 * @param flags     Thread flags.
 * @param name      Symbolic name.
 * @param uncounted Thread's accounting doesn't affect accumulated task
 *   accounting.
 *
 * @return New thread's structure on success, NULL on failure.
 *
 */
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
    int flags, char *name, bool uncounted)
{
    thread_t *t;
    ipl_t ipl;
   
    t = (thread_t *) slab_alloc(thread_slab, 0);
    if (!t)
        return NULL;
   
    /* Not needed, but good for debugging */
    memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES,
        0);
   
    ipl = interrupts_disable();
    spinlock_lock(&tidlock);
    t->tid = ++last_tid;
    spinlock_unlock(&tidlock);
    interrupts_restore(ipl);
   
    context_save(&t->saved_context);
    context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
        THREAD_STACK_SIZE);
   
    the_initialize((the_t *) t->kstack);
   
    ipl = interrupts_disable();
    t->saved_context.ipl = interrupts_read();
    interrupts_restore(ipl);
   
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
   
    t->thread_code = func;
    t->thread_arg = arg;
    t->ticks = -1;
    t->cycles = 0;
    t->uncounted = uncounted;
    t->priority = -1;       /* start in rq[0] */
    t->cpu = NULL;
    t->flags = flags;
    t->state = Entering;
    t->call_me = NULL;
    t->call_me_with = NULL;
   
    timeout_initialize(&t->sleep_timeout);
    t->sleep_interruptible = false;
    t->sleep_queue = NULL;
    t->timeout_pending = 0;
 
    t->in_copy_from_uspace = false;
    t->in_copy_to_uspace = false;
 
    t->interrupted = false;
    t->join_type = None;
    t->detached = false;
    waitq_initialize(&t->join_wq);
   
    t->rwlock_holder_type = RWLOCK_NONE;
       
    t->task = task;
   
    t->fpu_context_exists = 0;
    t->fpu_context_engaged = 0;
 
    /* might depend on previous initialization */
    thread_create_arch(t); 
   
    /*
     * Attach to the containing task.
     */
    ipl = interrupts_disable();  
    spinlock_lock(&task->lock);
    if (!task->accept_new_threads) {
        spinlock_unlock(&task->lock);
        slab_free(thread_slab, t);
        interrupts_restore(ipl);
        return NULL;
    }
    list_append(&t->th_link, &task->th_head);
    if (task->refcount++ == 0)
        task->main_thread = t;
    spinlock_unlock(&task->lock);
 
    /*
     * Register this thread in the system-wide list.
     */
    spinlock_lock(&threads_lock);
    btree_insert(&threads_btree, (btree_key_t) ((uintptr_t) t), (void *) t,
        NULL);
    spinlock_unlock(&threads_lock);
   
    interrupts_restore(ipl);
   
    return t;
}
 
/** Terminate thread.
 *
 * End current thread execution and switch it to the exiting state. All pending
 * timeouts are executed.
 */
void thread_exit(void)
{
    ipl_t ipl;
 
restart:
    ipl = interrupts_disable();
    spinlock_lock(&THREAD->lock);
    if (THREAD->timeout_pending) {
        /* busy waiting for timeouts in progress */
        spinlock_unlock(&THREAD->lock);
        interrupts_restore(ipl);
        goto restart;
    }
    THREAD->state = Exiting;
    spinlock_unlock(&THREAD->lock);
    scheduler();
 
    /* Not reached */
    while (1)
        ;
}
 
 
/** Thread sleep
 *
 * Suspend execution of the current thread.
 *
 * @param sec Number of seconds to sleep.
 *
 */
void thread_sleep(uint32_t sec)
{
    thread_usleep(sec * 1000000);
}
 
/** Wait for another thread to exit.
 *
 * @param t Thread to join on exit.
 * @param usec Timeout in microseconds.
 * @param flags Mode of operation.
 *
 * @return An error code from errno.h or an error code from synch.h.
 */
int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
{
    ipl_t ipl;
    int rc;
 
    if (t == THREAD)
        return EINVAL;
 
    /*
     * Since thread join can only be called once on an undetached thread,
     * the thread pointer is guaranteed to be still valid.
     */
   
    ipl = interrupts_disable();
    spinlock_lock(&t->lock);
    ASSERT(!t->detached);
    spinlock_unlock(&t->lock);
    interrupts_restore(ipl);
   
    rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
   
    return rc; 
}
 
/** Detach thread.
 *
 * Mark the thread as detached, if the thread is already in the Undead state,
 * deallocate its resources.
 *
 * @param t Thread to be detached.
 */
void thread_detach(thread_t *t)
{
    ipl_t ipl;
 
    /*
     * Since the thread is expected to not be already detached,
     * pointer to it must be still valid.
     */
    ipl = interrupts_disable();
    spinlock_lock(&t->lock);
    ASSERT(!t->detached);
    if (t->state == Undead) {
        thread_destroy(t);  /* unlocks &t->lock */
        interrupts_restore(ipl);
        return;
    } else {
        t->detached = true;
    }
    spinlock_unlock(&t->lock);
    interrupts_restore(ipl);
}
 
/** Thread usleep
 *
 * Suspend execution of the current thread.
 *
 * @param usec Number of microseconds to sleep.
 *
 */
void thread_usleep(uint32_t usec)
{
    waitq_t wq;
                 
    waitq_initialize(&wq);
 
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
}
 
/** Register thread out-of-context invocation
 *
 * Register a function and its argument to be executed
 * on next context switch to the current thread.
 *
 * @param call_me      Out-of-context function.
 * @param call_me_with Out-of-context function argument.
 *
 */
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
{
    ipl_t ipl;
   
    ipl = interrupts_disable();
    spinlock_lock(&THREAD->lock);
    THREAD->call_me = call_me;
    THREAD->call_me_with = call_me_with;
    spinlock_unlock(&THREAD->lock);
    interrupts_restore(ipl);
}
 
/** Print list of threads debug info */
void thread_print_list(void)
{
    link_t *cur;
    ipl_t ipl;
   
    /* Messing with thread structures, avoid deadlock */
    ipl = interrupts_disable();
    spinlock_lock(&threads_lock);
   
    printf("tid    name       address    state    task       ctx code       stack      cycles     cpu  kstack     waitqueue\n");
    printf("------ ---------- ---------- -------- ---------- --- ---------- ---------- ---------- ---- ---------- ----------\n");
 
    for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {
        btree_node_t *node;
        int i;
 
        node = list_get_instance(cur, btree_node_t, leaf_link);
        for (i = 0; i < node->keys; i++) {
            thread_t *t;
       
            t = (thread_t *) node->value[i];
           
            uint64_t cycles;
            char suffix;
            order(t->cycles, &cycles, &suffix);
           
            printf("%-6zd %-10s %#10zx %-8s %#10zx %-3ld %#10zx %#10zx %9llu%c ", t->tid, t->name, t, thread_states[t->state], t->task, t->task->context, t->thread_code, t->kstack, cycles, suffix);
           
            if (t->cpu)
                printf("%-4zd", t->cpu->id);
            else
                printf("none");
           
            if (t->state == Sleeping)
                printf(" %#10zx %#10zx", t->kstack, t->sleep_queue);
           
            printf("\n");
        }
    }
 
    spinlock_unlock(&threads_lock);
    interrupts_restore(ipl);
}
 
/** Check whether thread exists.
 *
 * Note that threads_lock must be already held and
 * interrupts must be already disabled.
 *
 * @param t Pointer to thread.
 *
 * @return True if thread t is known to the system, false otherwise.
 */
bool thread_exists(thread_t *t)
{
    btree_node_t *leaf;
   
    return btree_search(&threads_btree, (btree_key_t) ((uintptr_t) t), &leaf) != NULL;
}
 
 
/** Update accounting of current thread.
 *
 * Note that thread_lock on THREAD must be already held and
 * interrupts must be already disabled.
 *
 */
void thread_update_accounting(void)
{
    uint64_t time = get_cycle();
    THREAD->cycles += time - THREAD->last_cycle;
    THREAD->last_cycle = time;
}
 
/** Process syscall to create new thread.
 *
 */
unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name)
{
    thread_t *t;
    char namebuf[THREAD_NAME_BUFLEN];
    uspace_arg_t *kernel_uarg;
    uint32_t tid;
    int rc;
 
    rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
    if (rc != 0)
        return (unative_t) rc;
 
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
    if (rc != 0) {
        free(kernel_uarg);
        return (unative_t) rc;
    }
 
    if ((t = thread_create(uinit, kernel_uarg, TASK, THREAD_FLAG_USPACE, namebuf, false))) {
        tid = t->tid;
        thread_ready(t);
        return (unative_t) tid;
    } else {
        free(kernel_uarg);
    }
 
    return (unative_t) ENOMEM;
}
 
/** Process syscall to terminate thread.
 *
 */
unative_t sys_thread_exit(int uspace_status)
{
    thread_exit();
    /* Unreachable */
    return 0;
}
 
/** @}
 */
 

Rev 2067	Rev 2071
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (c) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup genericproc	29	/** @addtogroup genericproc
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file	34	* @file
35	* @brief Thread management functions.	35	* @brief Thread management functions.
36	*/	36	*/
37		37
38	#include <proc/scheduler.h>	38	#include <proc/scheduler.h>
39	#include <proc/thread.h>	39	#include <proc/thread.h>
40	#include <proc/task.h>	40	#include <proc/task.h>
41	#include <proc/uarg.h>	41	#include <proc/uarg.h>
42	#include <mm/frame.h>	42	#include <mm/frame.h>
43	#include <mm/page.h>	43	#include <mm/page.h>
44	#include <arch/asm.h>	44	#include <arch/asm.h>
45	#include <arch/cycle.h>	45	#include <arch/cycle.h>
46	#include <arch.h>	46	#include <arch.h>
47	#include <synch/synch.h>	47	#include <synch/synch.h>
48	#include <synch/spinlock.h>	48	#include <synch/spinlock.h>
49	#include <synch/waitq.h>	49	#include <synch/waitq.h>
50	#include <synch/rwlock.h>	50	#include <synch/rwlock.h>
51	#include <cpu.h>	51	#include <cpu.h>
52	#include <func.h>	52	#include <func.h>
53	#include <context.h>	53	#include <context.h>
54	#include <adt/btree.h>	54	#include <adt/btree.h>
55	#include <adt/list.h>	55	#include <adt/list.h>
56	#include <typedefs.h>	56	#include <typedefs.h>
57	#include <time/clock.h>	57	#include <time/clock.h>
58	#include <config.h>	58	#include <config.h>
59	#include <arch/interrupt.h>	59	#include <arch/interrupt.h>
60	#include <smp/ipi.h>	60	#include <smp/ipi.h>
61	#include <arch/faddr.h>	61	#include <arch/faddr.h>
62	#include <atomic.h>	62	#include <atomic.h>
63	#include <memstr.h>	63	#include <memstr.h>
64	#include <print.h>	64	#include <print.h>
65	#include <mm/slab.h>	65	#include <mm/slab.h>
66	#include <debug.h>	66	#include <debug.h>
67	#include <main/uinit.h>	67	#include <main/uinit.h>
68	#include <syscall/copy.h>	68	#include <syscall/copy.h>
69	#include <errno.h>	69	#include <errno.h>
70		70
71		71
72	/** Thread states */	72	/** Thread states */
73	char *thread_states[] = {	73	char *thread_states[] = {
74	"Invalid",	74	"Invalid",
75	"Running",	75	"Running",
76	"Sleeping",	76	"Sleeping",
77	"Ready",	77	"Ready",
78	"Entering",	78	"Entering",
79	"Exiting",	79	"Exiting",
80	"Undead"	80	"Undead"
81	};	81	};
82		82
83	/** Lock protecting the threads_btree B+tree.	83	/** Lock protecting the threads_btree B+tree.
84	*	84	*
85	* For locking rules, see declaration thereof.	85	* For locking rules, see declaration thereof.
86	*/	86	*/
87	SPINLOCK_INITIALIZE(threads_lock);	87	SPINLOCK_INITIALIZE(threads_lock);
88		88
89	/** B+tree of all threads.	89	/** B+tree of all threads.
90	*	90	*
91	* When a thread is found in the threads_btree B+tree, it is guaranteed to	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.	92	* exist as long as the threads_lock is held.
93	*/	93	*/
94	btree_t threads_btree;	94	btree_t threads_btree;
95		95
96	SPINLOCK_INITIALIZE(tidlock);	96	SPINLOCK_INITIALIZE(tidlock);
97	uint32_t last_tid = 0;	97	uint32_t last_tid = 0;
98		98
99	static slab_cache_t *thread_slab;	99	static slab_cache_t *thread_slab;
100	#ifdef ARCH_HAS_FPU	100	#ifdef ARCH_HAS_FPU
101	slab_cache_t *fpu_context_slab;	101	slab_cache_t *fpu_context_slab;
102	#endif	102	#endif
103		103
104	/** Thread wrapper.	104	/** Thread wrapper.
105	*	105	*
106	* This wrapper is provided to ensure that every thread makes a call to	106	* This wrapper is provided to ensure that every thread makes a call to
107	* thread_exit() when its implementing function returns.	107	* thread_exit() when its implementing function returns.
108	*	108	*
109	* interrupts_disable() is assumed.	109	* interrupts_disable() is assumed.
110	*	110	*
111	*/	111	*/
112	static void cushion(void)	112	static void cushion(void)
113	{	113	{
114	void (f)(void ) = THREAD->thread_code;	114	void (f)(void ) = THREAD->thread_code;
115	void *arg = THREAD->thread_arg;	115	void *arg = THREAD->thread_arg;
116	THREAD->last_cycle = get_cycle();	116	THREAD->last_cycle = get_cycle();
117		117
118	/* This is where each thread wakes up after its creation */	118	/* This is where each thread wakes up after its creation */
119	spinlock_unlock(&THREAD->lock);	119	spinlock_unlock(&THREAD->lock);
120	interrupts_enable();	120	interrupts_enable();
121		121
122	f(arg);	122	f(arg);
123		123
124	/* Accumulate accounting to the task */	124	/* Accumulate accounting to the task */
125	ipl_t ipl = interrupts_disable();	125	ipl_t ipl = interrupts_disable();
126		126
127	spinlock_lock(&THREAD->lock);	127	spinlock_lock(&THREAD->lock);
128	if (!THREAD->uncounted) {	128	if (!THREAD->uncounted) {
129	thread_update_accounting();	129	thread_update_accounting();
130	uint64_t cycles = THREAD->cycles;	130	uint64_t cycles = THREAD->cycles;
131	THREAD->cycles = 0;	131	THREAD->cycles = 0;
132	spinlock_unlock(&THREAD->lock);	132	spinlock_unlock(&THREAD->lock);
133		133
134	spinlock_lock(&TASK->lock);	134	spinlock_lock(&TASK->lock);
135	TASK->cycles += cycles;	135	TASK->cycles += cycles;
136	spinlock_unlock(&TASK->lock);	136	spinlock_unlock(&TASK->lock);
137	} else	137	} else
138	spinlock_unlock(&THREAD->lock);	138	spinlock_unlock(&THREAD->lock);
139		139
140	interrupts_restore(ipl);	140	interrupts_restore(ipl);
141		141
142	thread_exit();	142	thread_exit();
143	/* not reached */	143	/* not reached */
144	}	144	}
145		145
146	/** Initialization and allocation for thread_t structure */	146	/** Initialization and allocation for thread_t structure */
147	static int thr_constructor(void *obj, int kmflags)	147	static int thr_constructor(void *obj, int kmflags)
148	{	148	{
149	thread_t t = (thread_t ) obj;	149	thread_t t = (thread_t ) obj;
150		150
151	spinlock_initialize(&t->lock, "thread_t_lock");	151	spinlock_initialize(&t->lock, "thread_t_lock");
152	link_initialize(&t->rq_link);	152	link_initialize(&t->rq_link);
153	link_initialize(&t->wq_link);	153	link_initialize(&t->wq_link);
154	link_initialize(&t->th_link);	154	link_initialize(&t->th_link);
155		155
156	/* call the architecture-specific part of the constructor */	156	/* call the architecture-specific part of the constructor */
157	thr_constructor_arch(t);	157	thr_constructor_arch(t);
158		158
159	#ifdef ARCH_HAS_FPU	159	#ifdef ARCH_HAS_FPU
160	# ifdef CONFIG_FPU_LAZY	160	# ifdef CONFIG_FPU_LAZY
161	t->saved_fpu_context = NULL;	161	t->saved_fpu_context = NULL;
162	# else	162	# else
163	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	163	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
164	if (!t->saved_fpu_context)	164	if (!t->saved_fpu_context)
165	return -1;	165	return -1;
166	# endif	166	# endif
167	#endif	167	#endif
168		168
169	t->kstack = frame_alloc(STACK_FRAMES, FRAME_KA \| kmflags);	169	t->kstack = frame_alloc(STACK_FRAMES, FRAME_KA \| kmflags);
170	if (! t->kstack) {	170	if (! t->kstack) {
171	#ifdef ARCH_HAS_FPU	171	#ifdef ARCH_HAS_FPU
172	if (t->saved_fpu_context)	172	if (t->saved_fpu_context)
173	slab_free(fpu_context_slab,t->saved_fpu_context);	173	slab_free(fpu_context_slab,t->saved_fpu_context);
174	#endif	174	#endif
175	return -1;	175	return -1;
176	}	176	}
177		177
178	return 0;	178	return 0;
179	}	179	}
180		180
181	/** Destruction of thread_t object */	181	/** Destruction of thread_t object */
182	static int thr_destructor(void *obj)	182	static int thr_destructor(void *obj)
183	{	183	{
184	thread_t t = (thread_t ) obj;	184	thread_t t = (thread_t ) obj;
185		185
186	/* call the architecture-specific part of the destructor */	186	/* call the architecture-specific part of the destructor */
187	thr_destructor_arch(t);	187	thr_destructor_arch(t);
188		188
189	frame_free(KA2PA(t->kstack));	189	frame_free(KA2PA(t->kstack));
190	#ifdef ARCH_HAS_FPU	190	#ifdef ARCH_HAS_FPU
191	if (t->saved_fpu_context)	191	if (t->saved_fpu_context)
192	slab_free(fpu_context_slab,t->saved_fpu_context);	192	slab_free(fpu_context_slab,t->saved_fpu_context);
193	#endif	193	#endif
194	return 1; /* One page freed */	194	return 1; /* One page freed */
195	}	195	}
196		196
197	/** Initialize threads	197	/** Initialize threads
198	*	198	*
199	* Initialize kernel threads support.	199	* Initialize kernel threads support.
200	*	200	*
201	*/	201	*/
202	void thread_init(void)	202	void thread_init(void)
203	{	203	{
204	THREAD = NULL;	204	THREAD = NULL;
205	atomic_set(&nrdy,0);	205	atomic_set(&nrdy,0);
206	thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,	206	thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
207	thr_constructor, thr_destructor, 0);	207	thr_constructor, thr_destructor, 0);
208		208
209	#ifdef ARCH_HAS_FPU	209	#ifdef ARCH_HAS_FPU
210	fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),	210	fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
211	FPU_CONTEXT_ALIGN, NULL, NULL, 0);	211	FPU_CONTEXT_ALIGN, NULL, NULL, 0);
212	#endif	212	#endif
213		213
214	btree_create(&threads_btree);	214	btree_create(&threads_btree);
215	}	215	}
216		216
217	/** Make thread ready	217	/** Make thread ready
218	*	218	*
219	* Switch thread t to the ready state.	219	* Switch thread t to the ready state.
220	*	220	*
221	* @param t Thread to make ready.	221	* @param t Thread to make ready.
222	*	222	*
223	*/	223	*/
224	void thread_ready(thread_t *t)	224	void thread_ready(thread_t *t)
225	{	225	{
226	cpu_t *cpu;	226	cpu_t *cpu;
227	runq_t *r;	227	runq_t *r;
228	ipl_t ipl;	228	ipl_t ipl;
229	int i, avg;	229	int i, avg;
230		230
231	ipl = interrupts_disable();	231	ipl = interrupts_disable();
232		232
233	spinlock_lock(&t->lock);	233	spinlock_lock(&t->lock);
234		234
235	ASSERT(! (t->state == Ready));	235	ASSERT(! (t->state == Ready));
236		236
237	i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;	237	i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority;
238		238
239	cpu = CPU;	239	cpu = CPU;
240	if (t->flags & THREAD_FLAG_WIRED) {	240	if (t->flags & THREAD_FLAG_WIRED) {
241	cpu = t->cpu;	241	cpu = t->cpu;
242	}	242	}
243	t->state = Ready;	243	t->state = Ready;
244	spinlock_unlock(&t->lock);	244	spinlock_unlock(&t->lock);
245		245
246	/*	246	/*
247	* Append t to respective ready queue on respective processor.	247	* Append t to respective ready queue on respective processor.
248	*/	248	*/
249	r = &cpu->rq[i];	249	r = &cpu->rq[i];
250	spinlock_lock(&r->lock);	250	spinlock_lock(&r->lock);
251	list_append(&t->rq_link, &r->rq_head);	251	list_append(&t->rq_link, &r->rq_head);
252	r->n++;	252	r->n++;
253	spinlock_unlock(&r->lock);	253	spinlock_unlock(&r->lock);
254		254
255	atomic_inc(&nrdy);	255	atomic_inc(&nrdy);
256	avg = atomic_get(&nrdy) / config.cpu_active;	256	avg = atomic_get(&nrdy) / config.cpu_active;
257	atomic_inc(&cpu->nrdy);	257	atomic_inc(&cpu->nrdy);
258		258
259	interrupts_restore(ipl);	259	interrupts_restore(ipl);
260	}	260	}
261		261
262	/** Destroy thread memory structure	262	/** Destroy thread memory structure
263	*	263	*
264	* Detach thread from all queues, cpus etc. and destroy it.	264	* Detach thread from all queues, cpus etc. and destroy it.
265	*	265	*
266	* Assume thread->lock is held!!	266	* Assume thread->lock is held!!
267	*/	267	*/
268	void thread_destroy(thread_t *t)	268	void thread_destroy(thread_t *t)
269	{	269	{
270	bool destroy_task = false;	270	bool destroy_task = false;
271		271
272	ASSERT(t->state == Exiting \|\| t->state == Undead);	272	ASSERT(t->state == Exiting \|\| t->state == Undead);
273	ASSERT(t->task);	273	ASSERT(t->task);
274	ASSERT(t->cpu);	274	ASSERT(t->cpu);
275		275
276	spinlock_lock(&t->cpu->lock);	276	spinlock_lock(&t->cpu->lock);
277	if(t->cpu->fpu_owner == t)	277	if(t->cpu->fpu_owner == t)
278	t->cpu->fpu_owner = NULL;	278	t->cpu->fpu_owner = NULL;
279	spinlock_unlock(&t->cpu->lock);	279	spinlock_unlock(&t->cpu->lock);
280		280
281	spinlock_unlock(&t->lock);	281	spinlock_unlock(&t->lock);
282		282
283	spinlock_lock(&threads_lock);	283	spinlock_lock(&threads_lock);
284	btree_remove(&threads_btree, (btree_key_t) ((uintptr_t ) t), NULL);	284	btree_remove(&threads_btree, (btree_key_t) ((uintptr_t ) t), NULL);
285	spinlock_unlock(&threads_lock);	285	spinlock_unlock(&threads_lock);
286		286
287	/*	287	/*
288	* Detach from the containing task.	288	* Detach from the containing task.
289	*/	289	*/
290	spinlock_lock(&t->task->lock);	290	spinlock_lock(&t->task->lock);
291	list_remove(&t->th_link);	291	list_remove(&t->th_link);
292	if (--t->task->refcount == 0) {	292	if (--t->task->refcount == 0) {
293	t->task->accept_new_threads = false;	293	t->task->accept_new_threads = false;
294	destroy_task = true;	294	destroy_task = true;
295	}	295	}
296	spinlock_unlock(&t->task->lock);	296	spinlock_unlock(&t->task->lock);
297		297
298	if (destroy_task)	298	if (destroy_task)
299	task_destroy(t->task);	299	task_destroy(t->task);
300		300
301	slab_free(thread_slab, t);	301	slab_free(thread_slab, t);
302	}	302	}
303		303
304	/** Create new thread	304	/** Create new thread
305	*	305	*
306	* Create a new thread.	306	* Create a new thread.
307	*	307	*
308	* @param func Thread's implementing function.	308	* @param func Thread's implementing function.
309	* @param arg Thread's implementing function argument.	309	* @param arg Thread's implementing function argument.
310	* @param task Task to which the thread belongs.	310	* @param task Task to which the thread belongs.
311	* @param flags Thread flags.	311	* @param flags Thread flags.
312	* @param name Symbolic name.	312	* @param name Symbolic name.
313	* @param uncounted Thread's accounting doesn't affect accumulated task	313	* @param uncounted Thread's accounting doesn't affect accumulated task
314	* accounting.	314	* accounting.
315	*	315	*
316	* @return New thread's structure on success, NULL on failure.	316	* @return New thread's structure on success, NULL on failure.
317	*	317	*
318	*/	318	*/
319	thread_t thread_create(void ( func)(void ), void arg, task_t *task,	319	thread_t thread_create(void ( func)(void ), void arg, task_t *task,
320	int flags, char *name, bool uncounted)	320	int flags, char *name, bool uncounted)
321	{	321	{
322	thread_t *t;	322	thread_t *t;
323	ipl_t ipl;	323	ipl_t ipl;
324		324
325	t = (thread_t *) slab_alloc(thread_slab, 0);	325	t = (thread_t *) slab_alloc(thread_slab, 0);
326	if (!t)	326	if (!t)
327	return NULL;	327	return NULL;
328		328
329	/* Not needed, but good for debugging */	329	/* Not needed, but good for debugging */
330	memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES,	330	memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES,
331	0);	331	0);
332		332
333	ipl = interrupts_disable();	333	ipl = interrupts_disable();
334	spinlock_lock(&tidlock);	334	spinlock_lock(&tidlock);
335	t->tid = ++last_tid;	335	t->tid = ++last_tid;
336	spinlock_unlock(&tidlock);	336	spinlock_unlock(&tidlock);
337	interrupts_restore(ipl);	337	interrupts_restore(ipl);
338		338
339	context_save(&t->saved_context);	339	context_save(&t->saved_context);
340	context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,	340	context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack,
341	THREAD_STACK_SIZE);	341	THREAD_STACK_SIZE);
342		342
343	the_initialize((the_t *) t->kstack);	343	the_initialize((the_t *) t->kstack);
344		344
345	ipl = interrupts_disable();	345	ipl = interrupts_disable();
346	t->saved_context.ipl = interrupts_read();	346	t->saved_context.ipl = interrupts_read();
347	interrupts_restore(ipl);	347	interrupts_restore(ipl);
348		348
349	memcpy(t->name, name, THREAD_NAME_BUFLEN);	349	memcpy(t->name, name, THREAD_NAME_BUFLEN);
350		350
351	t->thread_code = func;	351	t->thread_code = func;
352	t->thread_arg = arg;	352	t->thread_arg = arg;
353	t->ticks = -1;	353	t->ticks = -1;
354	t->cycles = 0;	354	t->cycles = 0;
355	t->uncounted = uncounted;	355	t->uncounted = uncounted;
356	t->priority = -1; /* start in rq[0] */	356	t->priority = -1; /* start in rq[0] */
357	t->cpu = NULL;	357	t->cpu = NULL;
358	t->flags = flags;	358	t->flags = flags;
359	t->state = Entering;	359	t->state = Entering;
360	t->call_me = NULL;	360	t->call_me = NULL;
361	t->call_me_with = NULL;	361	t->call_me_with = NULL;
362		362
363	timeout_initialize(&t->sleep_timeout);	363	timeout_initialize(&t->sleep_timeout);
364	t->sleep_interruptible = false;	364	t->sleep_interruptible = false;
365	t->sleep_queue = NULL;	365	t->sleep_queue = NULL;
366	t->timeout_pending = 0;	366	t->timeout_pending = 0;
367		367
368	t->in_copy_from_uspace = false;	368	t->in_copy_from_uspace = false;
369	t->in_copy_to_uspace = false;	369	t->in_copy_to_uspace = false;
370		370
371	t->interrupted = false;	371	t->interrupted = false;
372	t->join_type = None;	372	t->join_type = None;
373	t->detached = false;	373	t->detached = false;
374	waitq_initialize(&t->join_wq);	374	waitq_initialize(&t->join_wq);
375		375
376	t->rwlock_holder_type = RWLOCK_NONE;	376	t->rwlock_holder_type = RWLOCK_NONE;
377		377
378	t->task = task;	378	t->task = task;
379		379
380	t->fpu_context_exists = 0;	380	t->fpu_context_exists = 0;
381	t->fpu_context_engaged = 0;	381	t->fpu_context_engaged = 0;
382		382
383	/* might depend on previous initialization */	383	/* might depend on previous initialization */
384	thread_create_arch(t);	384	thread_create_arch(t);
385		385
386	/*	386	/*
387	* Attach to the containing task.	387	* Attach to the containing task.
388	*/	388	*/
389	ipl = interrupts_disable();	389	ipl = interrupts_disable();
390	spinlock_lock(&task->lock);	390	spinlock_lock(&task->lock);
391	if (!task->accept_new_threads) {	391	if (!task->accept_new_threads) {
392	spinlock_unlock(&task->lock);	392	spinlock_unlock(&task->lock);
393	slab_free(thread_slab, t);	393	slab_free(thread_slab, t);
394	interrupts_restore(ipl);	394	interrupts_restore(ipl);
395	return NULL;	395	return NULL;
396	}	396	}
397	list_append(&t->th_link, &task->th_head);	397	list_append(&t->th_link, &task->th_head);
398	if (task->refcount++ == 0)	398	if (task->refcount++ == 0)
399	task->main_thread = t;	399	task->main_thread = t;
400	spinlock_unlock(&task->lock);	400	spinlock_unlock(&task->lock);
401		401
402	/*	402	/*
403	* Register this thread in the system-wide list.	403	* Register this thread in the system-wide list.
404	*/	404	*/
405	spinlock_lock(&threads_lock);	405	spinlock_lock(&threads_lock);
406	btree_insert(&threads_btree, (btree_key_t) ((uintptr_t) t), (void *) t,	406	btree_insert(&threads_btree, (btree_key_t) ((uintptr_t) t), (void *) t,
407	NULL);	407	NULL);
408	spinlock_unlock(&threads_lock);	408	spinlock_unlock(&threads_lock);
409		409
410	interrupts_restore(ipl);	410	interrupts_restore(ipl);
411		411
412	return t;	412	return t;
413	}	413	}
414		414
415	/** Terminate thread.	415	/** Terminate thread.
416	*	416	*
417	* End current thread execution and switch it to the exiting state. All pending	417	* End current thread execution and switch it to the exiting state. All pending
418	* timeouts are executed.	418	* timeouts are executed.
419	*/	419	*/
420	void thread_exit(void)	420	void thread_exit(void)
421	{	421	{
422	ipl_t ipl;	422	ipl_t ipl;
423		423
424	restart:	424	restart:
425	ipl = interrupts_disable();	425	ipl = interrupts_disable();
426	spinlock_lock(&THREAD->lock);	426	spinlock_lock(&THREAD->lock);
427	if (THREAD->timeout_pending) {	427	if (THREAD->timeout_pending) {
428	/* busy waiting for timeouts in progress */	428	/* busy waiting for timeouts in progress */
429	spinlock_unlock(&THREAD->lock);	429	spinlock_unlock(&THREAD->lock);
430	interrupts_restore(ipl);	430	interrupts_restore(ipl);
431	goto restart;	431	goto restart;
432	}	432	}
433	THREAD->state = Exiting;	433	THREAD->state = Exiting;
434	spinlock_unlock(&THREAD->lock);	434	spinlock_unlock(&THREAD->lock);
435	scheduler();	435	scheduler();
436		436
437	/* Not reached */	437	/* Not reached */
438	while (1)	438	while (1)
439	;	439	;
440	}	440	}
441		441
442		442
443	/** Thread sleep	443	/** Thread sleep
444	*	444	*
445	* Suspend execution of the current thread.	445	* Suspend execution of the current thread.
446	*	446	*
447	* @param sec Number of seconds to sleep.	447	* @param sec Number of seconds to sleep.
448	*	448	*
449	*/	449	*/
450	void thread_sleep(uint32_t sec)	450	void thread_sleep(uint32_t sec)
451	{	451	{
452	thread_usleep(sec * 1000000);	452	thread_usleep(sec * 1000000);
453	}	453	}
454		454
455	/** Wait for another thread to exit.	455	/** Wait for another thread to exit.
456	*	456	*
457	* @param t Thread to join on exit.	457	* @param t Thread to join on exit.
458	* @param usec Timeout in microseconds.	458	* @param usec Timeout in microseconds.
459	* @param flags Mode of operation.	459	* @param flags Mode of operation.
460	*	460	*
461	* @return An error code from errno.h or an error code from synch.h.	461	* @return An error code from errno.h or an error code from synch.h.
462	*/	462	*/
463	int thread_join_timeout(thread_t *t, uint32_t usec, int flags)	463	int thread_join_timeout(thread_t *t, uint32_t usec, int flags)
464	{	464	{
465	ipl_t ipl;	465	ipl_t ipl;
466	int rc;	466	int rc;
467		467
468	if (t == THREAD)	468	if (t == THREAD)
469	return EINVAL;	469	return EINVAL;
470		470
471	/*	471	/*
472	* Since thread join can only be called once on an undetached thread,	472	* Since thread join can only be called once on an undetached thread,
473	* the thread pointer is guaranteed to be still valid.	473	* the thread pointer is guaranteed to be still valid.
474	*/	474	*/
475		475
476	ipl = interrupts_disable();	476	ipl = interrupts_disable();
477	spinlock_lock(&t->lock);	477	spinlock_lock(&t->lock);
478	ASSERT(!t->detached);	478	ASSERT(!t->detached);
479	spinlock_unlock(&t->lock);	479	spinlock_unlock(&t->lock);
480	interrupts_restore(ipl);	480	interrupts_restore(ipl);
481		481
482	rc = waitq_sleep_timeout(&t->join_wq, usec, flags);	482	rc = waitq_sleep_timeout(&t->join_wq, usec, flags);
483		483
484	return rc;	484	return rc;
485	}	485	}
486		486
487	/** Detach thread.	487	/** Detach thread.
488	*	488	*
489	* Mark the thread as detached, if the thread is already in the Undead state,	489	* Mark the thread as detached, if the thread is already in the Undead state,
490	* deallocate its resources.	490	* deallocate its resources.
491	*	491	*
492	* @param t Thread to be detached.	492	* @param t Thread to be detached.
493	*/	493	*/
494	void thread_detach(thread_t *t)	494	void thread_detach(thread_t *t)
495	{	495	{
496	ipl_t ipl;	496	ipl_t ipl;
497		497
498	/*	498	/*
499	* Since the thread is expected to not be already detached,	499	* Since the thread is expected to not be already detached,
500	* pointer to it must be still valid.	500	* pointer to it must be still valid.

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/proc/thread.c – Rev 2067 → 2071