WebSVN – HelenOS-historic – Diff – /kernel/trunk/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.
 */
 
/**
 * @file    thread.c
 * @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.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 threads_head list. For locking rules, see declaration thereof. */
SPINLOCK_INITIALIZE(threads_lock);
btree_t threads_btree;          /**< B+tree of all threads. */
 
SPINLOCK_INITIALIZE(tidlock);
__u32 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;
 
    /* this is where each thread wakes up after its creation */
    spinlock_unlock(&THREAD->lock);
    interrupts_enable();
 
    f(arg);
    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;
    pfn_t pfn;
    int status;
 
    spinlock_initialize(&t->lock, "thread_t_lock");
    link_initialize(&t->rq_link);
    link_initialize(&t->wq_link);
    link_initialize(&t->th_link);
   
#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  
 
    pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA | kmflags,&status);
    if (status) {
#ifdef ARCH_HAS_FPU
        if (t->saved_fpu_context)
            slab_free(fpu_context_slab,t->saved_fpu_context);
#endif
        return -1;
    }
    t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
 
    return 0;
}
 
/** Destruction of thread_t object */
static int thr_destructor(void *obj)
{
    thread_t *t = (thread_t *)obj;
 
    frame_free(ADDR2PFN(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 & X_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)
{
    ASSERT(t->state == Exiting);
    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);
 
    /*
     * Detach from the containing task.
     */
    spinlock_lock(&t->task->lock);
    list_remove(&t->th_link);
    spinlock_unlock(&t->task->lock);
   
    spinlock_unlock(&t->lock);
   
    spinlock_lock(&threads_lock);
    btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);
    spinlock_unlock(&threads_lock);
   
    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.
 *
 * @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)
{
    thread_t *t;
    ipl_t ipl;
   
    t = (thread_t *) slab_alloc(thread_slab, 0);
    if (!t)
        return NULL;
 
    thread_create_arch(t);
   
    /* Not needed, but good for debugging */
    memsetb((__address)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), (__address) 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->priority = -1;       /* start in rq[0] */
    t->cpu = NULL;
    t->flags = 0;
    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->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;
   
    /*
     * Register this thread in the system-wide list.
     */
    ipl = interrupts_disable();
    spinlock_lock(&threads_lock);
    btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);
    spinlock_unlock(&threads_lock);
   
    /*
     * Attach to the containing task.
     */
    spinlock_lock(&task->lock);
    list_append(&t->th_link, &task->th_head);
    spinlock_unlock(&task->lock);
   
    interrupts_restore(ipl);
   
    return t;
}
 
/** Make thread exiting
 *
 * 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();
}
 
 
/** Thread sleep
 *
 * Suspend execution of the current thread.
 *
 * @param sec Number of seconds to sleep.
 *
 */
void thread_sleep(__u32 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, __u32 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);
   
    (void) waitq_sleep_prepare(&t->join_wq);
    spinlock_unlock(&t->lock);
   
    rc = waitq_sleep_timeout_unsafe(&t->join_wq, usec, flags);
   
    waitq_sleep_finish(&t->join_wq, rc, ipl);
   
    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(__u32 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);
 
    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];
            printf("%s: address=%#zX, tid=%zd, state=%s, task=%#zX, code=%#zX, stack=%#zX, cpu=",
                t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
            if (t->cpu)
                printf("cpu%zd", t->cpu->id);
            else
                printf("none");
            if (t->state == Sleeping) {
                printf(", kst=%#zX", t->kstack);
                printf(", wq=%#zX", 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) ((__address) t), &leaf) != NULL;
}
 
/** Process syscall to create new thread.
 *
 */
__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name)
{
    thread_t *t;
    char namebuf[THREAD_NAME_BUFLEN];
    uspace_arg_t *kernel_uarg;
    __u32 tid;
    int rc;
 
    rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
    if (rc != 0)
        return (__native) 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 (__native) rc;
    }
 
    if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
        tid = t->tid;
        thread_ready(t);
        return (__native) tid;
    } else {
        free(kernel_uarg);
    }
 
    return (__native) ENOMEM;
}
 
/** Process syscall to terminate thread.
 *
 */
__native sys_thread_exit(int uspace_status)
{
    thread_exit();
    /* Unreachable */
    return 0;
}
 

Rev 1502	Rev 1571
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	/**	29	/**
30	* @file thread.c	30	* @file thread.c
31	* @brief Thread management functions.	31	* @brief Thread management functions.
32	*/	32	*/
33		33
34	#include <proc/scheduler.h>	34	#include <proc/scheduler.h>
35	#include <proc/thread.h>	35	#include <proc/thread.h>
36	#include <proc/task.h>	36	#include <proc/task.h>
37	#include <proc/uarg.h>	37	#include <proc/uarg.h>
38	#include <mm/frame.h>	38	#include <mm/frame.h>
39	#include <mm/page.h>	39	#include <mm/page.h>
40	#include <arch/asm.h>	40	#include <arch/asm.h>
41	#include <arch.h>	41	#include <arch.h>
42	#include <synch/synch.h>	42	#include <synch/synch.h>
43	#include <synch/spinlock.h>	43	#include <synch/spinlock.h>
44	#include <synch/waitq.h>	44	#include <synch/waitq.h>
45	#include <synch/rwlock.h>	45	#include <synch/rwlock.h>
46	#include <cpu.h>	46	#include <cpu.h>
47	#include <func.h>	47	#include <func.h>
48	#include <context.h>	48	#include <context.h>
49	#include <adt/btree.h>	49	#include <adt/btree.h>
50	#include <adt/list.h>	50	#include <adt/list.h>
51	#include <typedefs.h>	51	#include <typedefs.h>
52	#include <time/clock.h>	52	#include <time/clock.h>
53	#include <config.h>	53	#include <config.h>
54	#include <arch/interrupt.h>	54	#include <arch/interrupt.h>
55	#include <smp/ipi.h>	55	#include <smp/ipi.h>
56	#include <arch/faddr.h>	56	#include <arch/faddr.h>
57	#include <atomic.h>	57	#include <atomic.h>
58	#include <memstr.h>	58	#include <memstr.h>
59	#include <print.h>	59	#include <print.h>
60	#include <mm/slab.h>	60	#include <mm/slab.h>
61	#include <debug.h>	61	#include <debug.h>
62	#include <main/uinit.h>	62	#include <main/uinit.h>
63	#include <syscall/copy.h>	63	#include <syscall/copy.h>
64	#include <errno.h>	64	#include <errno.h>
65		65
-		66
-		67	/** Thread states */
66	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	68	char *thread_states[] = {
-		69	"Invalid",
-		70	"Running",
-		71	"Sleeping",
-		72	"Ready",
-		73	"Entering",
-		74	"Exiting",
-		75	"Undead"
-		76	};
67		77
68	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */	78	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */
69	SPINLOCK_INITIALIZE(threads_lock);	79	SPINLOCK_INITIALIZE(threads_lock);
70	btree_t threads_btree; /*< B+tree of all threads. /	80	btree_t threads_btree; /*< B+tree of all threads. /
71		81
72	SPINLOCK_INITIALIZE(tidlock);	82	SPINLOCK_INITIALIZE(tidlock);
73	__u32 last_tid = 0;	83	__u32 last_tid = 0;
74		84
75	static slab_cache_t *thread_slab;	85	static slab_cache_t *thread_slab;
76	#ifdef ARCH_HAS_FPU	86	#ifdef ARCH_HAS_FPU
77	slab_cache_t *fpu_context_slab;	87	slab_cache_t *fpu_context_slab;
78	#endif	88	#endif
79		89
80	/** Thread wrapper	90	/** Thread wrapper
81	*	91	*
82	* This wrapper is provided to ensure that every thread	92	* This wrapper is provided to ensure that every thread
83	* makes a call to thread_exit() when its implementing	93	* makes a call to thread_exit() when its implementing
84	* function returns.	94	* function returns.
85	*	95	*
86	* interrupts_disable() is assumed.	96	* interrupts_disable() is assumed.
87	*	97	*
88	*/	98	*/
89	static void cushion(void)	99	static void cushion(void)
90	{	100	{
91	void (f)(void ) = THREAD->thread_code;	101	void (f)(void ) = THREAD->thread_code;
92	void *arg = THREAD->thread_arg;	102	void *arg = THREAD->thread_arg;
93		103
94	/* this is where each thread wakes up after its creation */	104	/* this is where each thread wakes up after its creation */
95	spinlock_unlock(&THREAD->lock);	105	spinlock_unlock(&THREAD->lock);
96	interrupts_enable();	106	interrupts_enable();
97		107
98	f(arg);	108	f(arg);
99	thread_exit();	109	thread_exit();
100	/* not reached */	110	/* not reached */
101	}	111	}
102		112
103	/** Initialization and allocation for thread_t structure */	113	/** Initialization and allocation for thread_t structure */
104	static int thr_constructor(void *obj, int kmflags)	114	static int thr_constructor(void *obj, int kmflags)
105	{	115	{
106	thread_t t = (thread_t )obj;	116	thread_t t = (thread_t )obj;
107	pfn_t pfn;	117	pfn_t pfn;
108	int status;	118	int status;
109		119
110	spinlock_initialize(&t->lock, "thread_t_lock");	120	spinlock_initialize(&t->lock, "thread_t_lock");
111	link_initialize(&t->rq_link);	121	link_initialize(&t->rq_link);
112	link_initialize(&t->wq_link);	122	link_initialize(&t->wq_link);
113	link_initialize(&t->th_link);	123	link_initialize(&t->th_link);
114		124
115	#ifdef ARCH_HAS_FPU	125	#ifdef ARCH_HAS_FPU
116	# ifdef CONFIG_FPU_LAZY	126	# ifdef CONFIG_FPU_LAZY
117	t->saved_fpu_context = NULL;	127	t->saved_fpu_context = NULL;
118	# else	128	# else
119	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	129	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
120	if (!t->saved_fpu_context)	130	if (!t->saved_fpu_context)
121	return -1;	131	return -1;
122	# endif	132	# endif
123	#endif	133	#endif
124		134
125	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	135	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
126	if (status) {	136	if (status) {
127	#ifdef ARCH_HAS_FPU	137	#ifdef ARCH_HAS_FPU
128	if (t->saved_fpu_context)	138	if (t->saved_fpu_context)
129	slab_free(fpu_context_slab,t->saved_fpu_context);	139	slab_free(fpu_context_slab,t->saved_fpu_context);
130	#endif	140	#endif
131	return -1;	141	return -1;
132	}	142	}
133	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	143	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
134		144
135	return 0;	145	return 0;
136	}	146	}
137		147
138	/** Destruction of thread_t object */	148	/** Destruction of thread_t object */
139	static int thr_destructor(void *obj)	149	static int thr_destructor(void *obj)
140	{	150	{
141	thread_t t = (thread_t )obj;	151	thread_t t = (thread_t )obj;
142		152
143	frame_free(ADDR2PFN(KA2PA(t->kstack)));	153	frame_free(ADDR2PFN(KA2PA(t->kstack)));
144	#ifdef ARCH_HAS_FPU	154	#ifdef ARCH_HAS_FPU
145	if (t->saved_fpu_context)	155	if (t->saved_fpu_context)
146	slab_free(fpu_context_slab,t->saved_fpu_context);	156	slab_free(fpu_context_slab,t->saved_fpu_context);
147	#endif	157	#endif
148	return 1; /* One page freed */	158	return 1; /* One page freed */
149	}	159	}
150		160
151	/** Initialize threads	161	/** Initialize threads
152	*	162	*
153	* Initialize kernel threads support.	163	* Initialize kernel threads support.
154	*	164	*
155	*/	165	*/
156	void thread_init(void)	166	void thread_init(void)
157	{	167	{
158	THREAD = NULL;	168	THREAD = NULL;
159	atomic_set(&nrdy,0);	169	atomic_set(&nrdy,0);
160	thread_slab = slab_cache_create("thread_slab",	170	thread_slab = slab_cache_create("thread_slab",
161	sizeof(thread_t),0,	171	sizeof(thread_t),0,
162	thr_constructor, thr_destructor, 0);	172	thr_constructor, thr_destructor, 0);
163	#ifdef ARCH_HAS_FPU	173	#ifdef ARCH_HAS_FPU
164	fpu_context_slab = slab_cache_create("fpu_slab",	174	fpu_context_slab = slab_cache_create("fpu_slab",
165	sizeof(fpu_context_t),	175	sizeof(fpu_context_t),
166	FPU_CONTEXT_ALIGN,	176	FPU_CONTEXT_ALIGN,
167	NULL, NULL, 0);	177	NULL, NULL, 0);
168	#endif	178	#endif
169		179
170	btree_create(&threads_btree);	180	btree_create(&threads_btree);
171	}	181	}
172		182
173	/** Make thread ready	183	/** Make thread ready
174	*	184	*
175	* Switch thread t to the ready state.	185	* Switch thread t to the ready state.
176	*	186	*
177	* @param t Thread to make ready.	187	* @param t Thread to make ready.
178	*	188	*
179	*/	189	*/
180	void thread_ready(thread_t *t)	190	void thread_ready(thread_t *t)
181	{	191	{
182	cpu_t *cpu;	192	cpu_t *cpu;
183	runq_t *r;	193	runq_t *r;
184	ipl_t ipl;	194	ipl_t ipl;
185	int i, avg;	195	int i, avg;
186		196
187	ipl = interrupts_disable();	197	ipl = interrupts_disable();
188		198
189	spinlock_lock(&t->lock);	199	spinlock_lock(&t->lock);
190		200
191	ASSERT(! (t->state == Ready));	201	ASSERT(! (t->state == Ready));
192		202
193	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	203	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
194		204
195	cpu = CPU;	205	cpu = CPU;
196	if (t->flags & X_WIRED) {	206	if (t->flags & X_WIRED) {
197	cpu = t->cpu;	207	cpu = t->cpu;
198	}	208	}
199	t->state = Ready;	209	t->state = Ready;
200	spinlock_unlock(&t->lock);	210	spinlock_unlock(&t->lock);
201		211
202	/*	212	/*
203	* Append t to respective ready queue on respective processor.	213	* Append t to respective ready queue on respective processor.
204	*/	214	*/
205	r = &cpu->rq[i];	215	r = &cpu->rq[i];
206	spinlock_lock(&r->lock);	216	spinlock_lock(&r->lock);
207	list_append(&t->rq_link, &r->rq_head);	217	list_append(&t->rq_link, &r->rq_head);
208	r->n++;	218	r->n++;
209	spinlock_unlock(&r->lock);	219	spinlock_unlock(&r->lock);
210		220
211	atomic_inc(&nrdy);	221	atomic_inc(&nrdy);
212	avg = atomic_get(&nrdy) / config.cpu_active;	222	avg = atomic_get(&nrdy) / config.cpu_active;
213	atomic_inc(&cpu->nrdy);	223	atomic_inc(&cpu->nrdy);
214		224
215	interrupts_restore(ipl);	225	interrupts_restore(ipl);
216	}	226	}
217		227
218	/** Destroy thread memory structure	228	/** Destroy thread memory structure
219	*	229	*
220	* Detach thread from all queues, cpus etc. and destroy it.	230	* Detach thread from all queues, cpus etc. and destroy it.
221	*	231	*
222	* Assume thread->lock is held!!	232	* Assume thread->lock is held!!
223	*/	233	*/
224	void thread_destroy(thread_t *t)	234	void thread_destroy(thread_t *t)
225	{	235	{
226	ASSERT(t->state == Exiting);	236	ASSERT(t->state == Exiting);
227	ASSERT(t->task);	237	ASSERT(t->task);
228	ASSERT(t->cpu);	238	ASSERT(t->cpu);
229		239
230	spinlock_lock(&t->cpu->lock);	240	spinlock_lock(&t->cpu->lock);
231	if(t->cpu->fpu_owner==t)	241	if(t->cpu->fpu_owner==t)
232	t->cpu->fpu_owner=NULL;	242	t->cpu->fpu_owner=NULL;
233	spinlock_unlock(&t->cpu->lock);	243	spinlock_unlock(&t->cpu->lock);
234		244
235	/*	245	/*
236	* Detach from the containing task.	246	* Detach from the containing task.
237	*/	247	*/
238	spinlock_lock(&t->task->lock);	248	spinlock_lock(&t->task->lock);
239	list_remove(&t->th_link);	249	list_remove(&t->th_link);
240	spinlock_unlock(&t->task->lock);	250	spinlock_unlock(&t->task->lock);
241		251
242	spinlock_unlock(&t->lock);	252	spinlock_unlock(&t->lock);
243		253
244	spinlock_lock(&threads_lock);	254	spinlock_lock(&threads_lock);
245	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);	255	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);
246	spinlock_unlock(&threads_lock);	256	spinlock_unlock(&threads_lock);
247		257
248	slab_free(thread_slab, t);	258	slab_free(thread_slab, t);
249	}	259	}
250		260
251	/** Create new thread	261	/** Create new thread
252	*	262	*
253	* Create a new thread.	263	* Create a new thread.
254	*	264	*
255	* @param func Thread's implementing function.	265	* @param func Thread's implementing function.
256	* @param arg Thread's implementing function argument.	266	* @param arg Thread's implementing function argument.
257	* @param task Task to which the thread belongs.	267	* @param task Task to which the thread belongs.
258	* @param flags Thread flags.	268	* @param flags Thread flags.
259	* @param name Symbolic name.	269	* @param name Symbolic name.
260	*	270	*
261	* @return New thread's structure on success, NULL on failure.	271	* @return New thread's structure on success, NULL on failure.
262	*	272	*
263	*/	273	*/
264	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)	274	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)
265	{	275	{
266	thread_t *t;	276	thread_t *t;
267	ipl_t ipl;	277	ipl_t ipl;
268		278
269	t = (thread_t *) slab_alloc(thread_slab, 0);	279	t = (thread_t *) slab_alloc(thread_slab, 0);
270	if (!t)	280	if (!t)
271	return NULL;	281	return NULL;
272		282
273	thread_create_arch(t);	283	thread_create_arch(t);
274		284
275	/* Not needed, but good for debugging */	285	/* Not needed, but good for debugging */
276	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);	286	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);
277		287
278	ipl = interrupts_disable();	288	ipl = interrupts_disable();
279	spinlock_lock(&tidlock);	289	spinlock_lock(&tidlock);
280	t->tid = ++last_tid;	290	t->tid = ++last_tid;
281	spinlock_unlock(&tidlock);	291	spinlock_unlock(&tidlock);
282	interrupts_restore(ipl);	292	interrupts_restore(ipl);
283		293
284	context_save(&t->saved_context);	294	context_save(&t->saved_context);
285	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	295	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
286		296
287	the_initialize((the_t *) t->kstack);	297	the_initialize((the_t *) t->kstack);
288		298
289	ipl = interrupts_disable();	299	ipl = interrupts_disable();
290	t->saved_context.ipl = interrupts_read();	300	t->saved_context.ipl = interrupts_read();
291	interrupts_restore(ipl);	301	interrupts_restore(ipl);
292		302
293	memcpy(t->name, name, THREAD_NAME_BUFLEN);	303	memcpy(t->name, name, THREAD_NAME_BUFLEN);
294		304
295	t->thread_code = func;	305	t->thread_code = func;
296	t->thread_arg = arg;	306	t->thread_arg = arg;
297	t->ticks = -1;	307	t->ticks = -1;
298	t->priority = -1; /* start in rq[0] */	308	t->priority = -1; /* start in rq[0] */
299	t->cpu = NULL;	309	t->cpu = NULL;
300	t->flags = 0;	310	t->flags = 0;
301	t->state = Entering;	311	t->state = Entering;
302	t->call_me = NULL;	312	t->call_me = NULL;
303	t->call_me_with = NULL;	313	t->call_me_with = NULL;
304		314
305	timeout_initialize(&t->sleep_timeout);	315	timeout_initialize(&t->sleep_timeout);
306	t->sleep_interruptible = false;	316	t->sleep_interruptible = false;
307	t->sleep_queue = NULL;	317	t->sleep_queue = NULL;
308	t->timeout_pending = 0;	318	t->timeout_pending = 0;
309		319
310	t->in_copy_from_uspace = false;	320	t->in_copy_from_uspace = false;
311	t->in_copy_to_uspace = false;	321	t->in_copy_to_uspace = false;
312		322
-		323	t->detached = false;
-		324	waitq_initialize(&t->join_wq);
-		325
313	t->rwlock_holder_type = RWLOCK_NONE;	326	t->rwlock_holder_type = RWLOCK_NONE;
314		327
315	t->task = task;	328	t->task = task;
316		329
317	t->fpu_context_exists = 0;	330	t->fpu_context_exists = 0;
318	t->fpu_context_engaged = 0;	331	t->fpu_context_engaged = 0;
319		332
320	/*	333	/*
321	* Register this thread in the system-wide list.	334	* Register this thread in the system-wide list.
322	*/	335	*/
323	ipl = interrupts_disable();	336	ipl = interrupts_disable();
324	spinlock_lock(&threads_lock);	337	spinlock_lock(&threads_lock);
325	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);	338	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);
326	spinlock_unlock(&threads_lock);	339	spinlock_unlock(&threads_lock);
327		340
328	/*	341	/*
329	* Attach to the containing task.	342	* Attach to the containing task.
330	*/	343	*/
331	spinlock_lock(&task->lock);	344	spinlock_lock(&task->lock);
332	list_append(&t->th_link, &task->th_head);	345	list_append(&t->th_link, &task->th_head);
333	spinlock_unlock(&task->lock);	346	spinlock_unlock(&task->lock);
334		347
335	interrupts_restore(ipl);	348	interrupts_restore(ipl);
336		349
337	return t;	350	return t;
338	}	351	}
339		352
340	/** Make thread exiting	353	/** Make thread exiting
341	*	354	*
342	* End current thread execution and switch it to the exiting	355	* End current thread execution and switch it to the exiting
343	* state. All pending timeouts are executed.	356	* state. All pending timeouts are executed.
344	*	357	*
345	*/	358	*/
346	void thread_exit(void)	359	void thread_exit(void)
347	{	360	{
348	ipl_t ipl;	361	ipl_t ipl;
349		362
350	restart:	363	restart:
351	ipl = interrupts_disable();	364	ipl = interrupts_disable();
352	spinlock_lock(&THREAD->lock);	365	spinlock_lock(&THREAD->lock);
353	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	366	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
354	spinlock_unlock(&THREAD->lock);	367	spinlock_unlock(&THREAD->lock);
355	interrupts_restore(ipl);	368	interrupts_restore(ipl);
356	goto restart;	369	goto restart;
357	}	370	}
358	THREAD->state = Exiting;	371	THREAD->state = Exiting;
359	spinlock_unlock(&THREAD->lock);	372	spinlock_unlock(&THREAD->lock);
360	scheduler();	373	scheduler();
361	}	374	}
362		375
363		376
364	/** Thread sleep	377	/** Thread sleep
365	*	378	*
366	* Suspend execution of the current thread.	379	* Suspend execution of the current thread.
367	*	380	*
368	* @param sec Number of seconds to sleep.	381	* @param sec Number of seconds to sleep.
369	*	382	*
370	*/	383	*/
371	void thread_sleep(__u32 sec)	384	void thread_sleep(__u32 sec)
372	{	385	{
373	thread_usleep(sec*1000000);	386	thread_usleep(sec*1000000);
374	}	387	}
-		388
-		389	/** Wait for another thread to exit.
-		390	*
-		391	* @param t Thread to join on exit.
-		392	* @param usec Timeout in microseconds.
-		393	* @param flags Mode of operation.
-		394	*
-		395	* @return An error code from errno.h or an error code from synch.h.
-		396	*/
-		397	int thread_join_timeout(thread_t *t, __u32 usec, int flags)
-		398	{
-		399	ipl_t ipl;
-		400	int rc;
-		401
-		402	if (t == THREAD)
-		403	return EINVAL;
-		404
-		405	/*
-		406	* Since thread join can only be called once on an undetached thread,
-		407	* the thread pointer is guaranteed to be still valid.
-		408	*/
-		409
-		410	ipl = interrupts_disable();
-		411	spinlock_lock(&t->lock);
-		412
-		413	ASSERT(!t->detached);
-		414
-		415	(void) waitq_sleep_prepare(&t->join_wq);
-		416	spinlock_unlock(&t->lock);
-		417
-		418	rc = waitq_sleep_timeout_unsafe(&t->join_wq, usec, flags);
-		419
-		420	waitq_sleep_finish(&t->join_wq, rc, ipl);
-		421
-		422	return rc;
-		423	}
-		424
-		425	/** Detach thread.
-		426	*
-		427	* Mark the thread as detached, if the thread is already in the Undead state,
-		428	* deallocate its resources.
-		429	*
-		430	* @param t Thread to be detached.
-		431	*/
-		432	void thread_detach(thread_t *t)
-		433	{
-		434	ipl_t ipl;
-		435
-		436	/*
-		437	* Since the thread is expected to not be already detached,
-		438	* pointer to it must be still valid.
-		439	*/
-		440
-		441	ipl = interrupts_disable();
-		442	spinlock_lock(&t->lock);
-		443	ASSERT(!t->detached);
-		444	if (t->state == Undead) {
-		445	thread_destroy(t); /* unlocks &t->lock */
-		446	interrupts_restore(ipl);
-		447	return;
-		448	} else {
-		449	t->detached = true;
-		450	}
-		451	spinlock_unlock(&t->lock);
-		452	interrupts_restore(ipl);
-		453	}
375		454
376	/** Thread usleep	455	/** Thread usleep
377	*	456	*
378	* Suspend execution of the current thread.	457	* Suspend execution of the current thread.
379	*	458	*
380	* @param usec Number of microseconds to sleep.	459	* @param usec Number of microseconds to sleep.
381	*	460	*
382	*/	461	*/
383	void thread_usleep(__u32 usec)	462	void thread_usleep(__u32 usec)
384	{	463	{
385	waitq_t wq;	464	waitq_t wq;
386		465
387	waitq_initialize(&wq);	466	waitq_initialize(&wq);
388		467
389	(void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);	468	(void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
390	}	469	}
391		470
392	/** Register thread out-of-context invocation	471	/** Register thread out-of-context invocation
393	*	472	*
394	* Register a function and its argument to be executed	473	* Register a function and its argument to be executed
395	* on next context switch to the current thread.	474	* on next context switch to the current thread.
396	*	475	*
397	* @param call_me Out-of-context function.	476	* @param call_me Out-of-context function.
398	* @param call_me_with Out-of-context function argument.	477	* @param call_me_with Out-of-context function argument.
399	*	478	*
400	*/	479	*/
401	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	480	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
402	{	481	{
403	ipl_t ipl;	482	ipl_t ipl;
404		483
405	ipl = interrupts_disable();	484	ipl = interrupts_disable();
406	spinlock_lock(&THREAD->lock);	485	spinlock_lock(&THREAD->lock);
407	THREAD->call_me = call_me;	486	THREAD->call_me = call_me;
408	THREAD->call_me_with = call_me_with;	487	THREAD->call_me_with = call_me_with;
409	spinlock_unlock(&THREAD->lock);	488	spinlock_unlock(&THREAD->lock);
410	interrupts_restore(ipl);	489	interrupts_restore(ipl);
411	}	490	}
412		491
413	/** Print list of threads debug info */	492	/** Print list of threads debug info */
414	void thread_print_list(void)	493	void thread_print_list(void)
415	{	494	{
416	link_t *cur;	495	link_t *cur;
417	ipl_t ipl;	496	ipl_t ipl;
418		497
419	/* Messing with thread structures, avoid deadlock */	498	/* Messing with thread structures, avoid deadlock */
420	ipl = interrupts_disable();	499	ipl = interrupts_disable();
421	spinlock_lock(&threads_lock);	500	spinlock_lock(&threads_lock);

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(root)/kernel/trunk/generic/src/proc/thread.c – Rev 1502 → 1571