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.
 */
 
#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 <adt/list.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>
 
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
 
/** 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_queue = NULL;
    t->timeout_pending = 0;
   
    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);
}
 
/** 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_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=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
                t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
            if (t->cpu)
                printf("cpu%d ", t->cpu->id);
            else
                printf("none");
            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;
 
        copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
 
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
    copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
 
        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) -1;
}
 
/** Process syscall to terminate thread.
 *
 */
__native sys_thread_exit(int uspace_status)
{
        thread_exit();
        /* Unreachable */
        return 0;
}
 

Rev 1171	Rev 1177
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	#include <proc/scheduler.h>	29	#include <proc/scheduler.h>
30	#include <proc/thread.h>	30	#include <proc/thread.h>
31	#include <proc/task.h>	31	#include <proc/task.h>
32	#include <proc/uarg.h>	32	#include <proc/uarg.h>
33	#include <mm/frame.h>	33	#include <mm/frame.h>
34	#include <mm/page.h>	34	#include <mm/page.h>
35	#include <arch/asm.h>	35	#include <arch/asm.h>
36	#include <arch.h>	36	#include <arch.h>
37	#include <synch/synch.h>	37	#include <synch/synch.h>
38	#include <synch/spinlock.h>	38	#include <synch/spinlock.h>
39	#include <synch/waitq.h>	39	#include <synch/waitq.h>
40	#include <synch/rwlock.h>	40	#include <synch/rwlock.h>
41	#include <cpu.h>	41	#include <cpu.h>
42	#include <func.h>	42	#include <func.h>
43	#include <context.h>	43	#include <context.h>
44	#include <adt/btree.h>	44	#include <adt/btree.h>
45	#include <adt/list.h>	45	#include <adt/list.h>
46	#include <typedefs.h>	46	#include <typedefs.h>
47	#include <time/clock.h>	47	#include <time/clock.h>
48	#include <adt/list.h>	48	#include <adt/list.h>
49	#include <config.h>	49	#include <config.h>
50	#include <arch/interrupt.h>	50	#include <arch/interrupt.h>
51	#include <smp/ipi.h>	51	#include <smp/ipi.h>
52	#include <arch/faddr.h>	52	#include <arch/faddr.h>
53	#include <atomic.h>	53	#include <atomic.h>
54	#include <memstr.h>	54	#include <memstr.h>
55	#include <print.h>	55	#include <print.h>
56	#include <mm/slab.h>	56	#include <mm/slab.h>
57	#include <debug.h>	57	#include <debug.h>
58	#include <main/uinit.h>	58	#include <main/uinit.h>
59		59
60	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	60	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
61		61
62	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */	62	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */
63	SPINLOCK_INITIALIZE(threads_lock);	63	SPINLOCK_INITIALIZE(threads_lock);
64	btree_t threads_btree; /*< B+tree of all threads. /	64	btree_t threads_btree; /*< B+tree of all threads. /
65		65
66	SPINLOCK_INITIALIZE(tidlock);	66	SPINLOCK_INITIALIZE(tidlock);
67	__u32 last_tid = 0;	67	__u32 last_tid = 0;
68		68
69	static slab_cache_t *thread_slab;	69	static slab_cache_t *thread_slab;
70	#ifdef ARCH_HAS_FPU	70	#ifdef ARCH_HAS_FPU
71	slab_cache_t *fpu_context_slab;	71	slab_cache_t *fpu_context_slab;
72	#endif	72	#endif
73		73
74	/** Thread wrapper	74	/** Thread wrapper
75	*	75	*
76	* This wrapper is provided to ensure that every thread	76	* This wrapper is provided to ensure that every thread
77	* makes a call to thread_exit() when its implementing	77	* makes a call to thread_exit() when its implementing
78	* function returns.	78	* function returns.
79	*	79	*
80	* interrupts_disable() is assumed.	80	* interrupts_disable() is assumed.
81	*	81	*
82	*/	82	*/
83	static void cushion(void)	83	static void cushion(void)
84	{	84	{
85	void (f)(void ) = THREAD->thread_code;	85	void (f)(void ) = THREAD->thread_code;
86	void *arg = THREAD->thread_arg;	86	void *arg = THREAD->thread_arg;
87		87
88	/* this is where each thread wakes up after its creation */	88	/* this is where each thread wakes up after its creation */
89	spinlock_unlock(&THREAD->lock);	89	spinlock_unlock(&THREAD->lock);
90	interrupts_enable();	90	interrupts_enable();
91		91
92	f(arg);	92	f(arg);
93	thread_exit();	93	thread_exit();
94	/* not reached */	94	/* not reached */
95	}	95	}
96		96
97	/** Initialization and allocation for thread_t structure */	97	/** Initialization and allocation for thread_t structure */
98	static int thr_constructor(void *obj, int kmflags)	98	static int thr_constructor(void *obj, int kmflags)
99	{	99	{
100	thread_t t = (thread_t )obj;	100	thread_t t = (thread_t )obj;
101	pfn_t pfn;	101	pfn_t pfn;
102	int status;	102	int status;
103		103
104	spinlock_initialize(&t->lock, "thread_t_lock");	104	spinlock_initialize(&t->lock, "thread_t_lock");
105	link_initialize(&t->rq_link);	105	link_initialize(&t->rq_link);
106	link_initialize(&t->wq_link);	106	link_initialize(&t->wq_link);
107	link_initialize(&t->th_link);	107	link_initialize(&t->th_link);
108		108
109	#ifdef ARCH_HAS_FPU	109	#ifdef ARCH_HAS_FPU
110	# ifdef CONFIG_FPU_LAZY	110	# ifdef CONFIG_FPU_LAZY
111	t->saved_fpu_context = NULL;	111	t->saved_fpu_context = NULL;
112	# else	112	# else
113	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	113	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
114	if (!t->saved_fpu_context)	114	if (!t->saved_fpu_context)
115	return -1;	115	return -1;
116	# endif	116	# endif
117	#endif	117	#endif
118		118
119	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	119	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
120	if (status) {	120	if (status) {
121	#ifdef ARCH_HAS_FPU	121	#ifdef ARCH_HAS_FPU
122	if (t->saved_fpu_context)	122	if (t->saved_fpu_context)
123	slab_free(fpu_context_slab,t->saved_fpu_context);	123	slab_free(fpu_context_slab,t->saved_fpu_context);
124	#endif	124	#endif
125	return -1;	125	return -1;
126	}	126	}
127	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	127	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
128		128
129	return 0;	129	return 0;
130	}	130	}
131		131
132	/** Destruction of thread_t object */	132	/** Destruction of thread_t object */
133	static int thr_destructor(void *obj)	133	static int thr_destructor(void *obj)
134	{	134	{
135	thread_t t = (thread_t )obj;	135	thread_t t = (thread_t )obj;
136		136
137	frame_free(ADDR2PFN(KA2PA(t->kstack)));	137	frame_free(ADDR2PFN(KA2PA(t->kstack)));
138	#ifdef ARCH_HAS_FPU	138	#ifdef ARCH_HAS_FPU
139	if (t->saved_fpu_context)	139	if (t->saved_fpu_context)
140	slab_free(fpu_context_slab,t->saved_fpu_context);	140	slab_free(fpu_context_slab,t->saved_fpu_context);
141	#endif	141	#endif
142	return 1; /* One page freed */	142	return 1; /* One page freed */
143	}	143	}
144		144
145	/** Initialize threads	145	/** Initialize threads
146	*	146	*
147	* Initialize kernel threads support.	147	* Initialize kernel threads support.
148	*	148	*
149	*/	149	*/
150	void thread_init(void)	150	void thread_init(void)
151	{	151	{
152	THREAD = NULL;	152	THREAD = NULL;
153	atomic_set(&nrdy,0);	153	atomic_set(&nrdy,0);
154	thread_slab = slab_cache_create("thread_slab",	154	thread_slab = slab_cache_create("thread_slab",
155	sizeof(thread_t),0,	155	sizeof(thread_t),0,
156	thr_constructor, thr_destructor, 0);	156	thr_constructor, thr_destructor, 0);
157	#ifdef ARCH_HAS_FPU	157	#ifdef ARCH_HAS_FPU
158	fpu_context_slab = slab_cache_create("fpu_slab",	158	fpu_context_slab = slab_cache_create("fpu_slab",
159	sizeof(fpu_context_t),	159	sizeof(fpu_context_t),
160	FPU_CONTEXT_ALIGN,	160	FPU_CONTEXT_ALIGN,
161	NULL, NULL, 0);	161	NULL, NULL, 0);
162	#endif	162	#endif
163		163
164	btree_create(&threads_btree);	164	btree_create(&threads_btree);
165	}	165	}
166		166
167	/** Make thread ready	167	/** Make thread ready
168	*	168	*
169	* Switch thread t to the ready state.	169	* Switch thread t to the ready state.
170	*	170	*
171	* @param t Thread to make ready.	171	* @param t Thread to make ready.
172	*	172	*
173	*/	173	*/
174	void thread_ready(thread_t *t)	174	void thread_ready(thread_t *t)
175	{	175	{
176	cpu_t *cpu;	176	cpu_t *cpu;
177	runq_t *r;	177	runq_t *r;
178	ipl_t ipl;	178	ipl_t ipl;
179	int i, avg;	179	int i, avg;
180		180
181	ipl = interrupts_disable();	181	ipl = interrupts_disable();
182		182
183	spinlock_lock(&t->lock);	183	spinlock_lock(&t->lock);
184		184
185	ASSERT(! (t->state == Ready));	185	ASSERT(! (t->state == Ready));
186		186
187	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	187	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
188		188
189	cpu = CPU;	189	cpu = CPU;
190	if (t->flags & X_WIRED) {	190	if (t->flags & X_WIRED) {
191	cpu = t->cpu;	191	cpu = t->cpu;
192	}	192	}
193	t->state = Ready;	193	t->state = Ready;
194	spinlock_unlock(&t->lock);	194	spinlock_unlock(&t->lock);
195		195
196	/*	196	/*
197	* Append t to respective ready queue on respective processor.	197	* Append t to respective ready queue on respective processor.
198	*/	198	*/
199	r = &cpu->rq[i];	199	r = &cpu->rq[i];
200	spinlock_lock(&r->lock);	200	spinlock_lock(&r->lock);
201	list_append(&t->rq_link, &r->rq_head);	201	list_append(&t->rq_link, &r->rq_head);
202	r->n++;	202	r->n++;
203	spinlock_unlock(&r->lock);	203	spinlock_unlock(&r->lock);
204		204
205	atomic_inc(&nrdy);	205	atomic_inc(&nrdy);
206	avg = atomic_get(&nrdy) / config.cpu_active;	206	avg = atomic_get(&nrdy) / config.cpu_active;
207	atomic_inc(&cpu->nrdy);	207	atomic_inc(&cpu->nrdy);
208		208
209	interrupts_restore(ipl);	209	interrupts_restore(ipl);
210	}	210	}
211		211
212	/** Destroy thread memory structure	212	/** Destroy thread memory structure
213	*	213	*
214	* Detach thread from all queues, cpus etc. and destroy it.	214	* Detach thread from all queues, cpus etc. and destroy it.
215	*	215	*
216	* Assume thread->lock is held!!	216	* Assume thread->lock is held!!
217	*/	217	*/
218	void thread_destroy(thread_t *t)	218	void thread_destroy(thread_t *t)
219	{	219	{
220	ASSERT(t->state == Exiting);	220	ASSERT(t->state == Exiting);
221	ASSERT(t->task);	221	ASSERT(t->task);
222	ASSERT(t->cpu);	222	ASSERT(t->cpu);
223		223
224	spinlock_lock(&t->cpu->lock);	224	spinlock_lock(&t->cpu->lock);
225	if(t->cpu->fpu_owner==t)	225	if(t->cpu->fpu_owner==t)
226	t->cpu->fpu_owner=NULL;	226	t->cpu->fpu_owner=NULL;
227	spinlock_unlock(&t->cpu->lock);	227	spinlock_unlock(&t->cpu->lock);
228		228
229	/*	229	/*
230	* Detach from the containing task.	230	* Detach from the containing task.
231	*/	231	*/
232	spinlock_lock(&t->task->lock);	232	spinlock_lock(&t->task->lock);
233	list_remove(&t->th_link);	233	list_remove(&t->th_link);
234	spinlock_unlock(&t->task->lock);	234	spinlock_unlock(&t->task->lock);
235		235
236	spinlock_unlock(&t->lock);	236	spinlock_unlock(&t->lock);
237		237
238	spinlock_lock(&threads_lock);	238	spinlock_lock(&threads_lock);
239	btree_remove(&threads_btree, (__native) t, NULL);	239	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);
240	spinlock_unlock(&threads_lock);	240	spinlock_unlock(&threads_lock);
241		241
242	slab_free(thread_slab, t);	242	slab_free(thread_slab, t);
243	}	243	}
244		244
245	/** Create new thread	245	/** Create new thread
246	*	246	*
247	* Create a new thread.	247	* Create a new thread.
248	*	248	*
249	* @param func Thread's implementing function.	249	* @param func Thread's implementing function.
250	* @param arg Thread's implementing function argument.	250	* @param arg Thread's implementing function argument.
251	* @param task Task to which the thread belongs.	251	* @param task Task to which the thread belongs.
252	* @param flags Thread flags.	252	* @param flags Thread flags.
253	* @param name Symbolic name.	253	* @param name Symbolic name.
254	*	254	*
255	* @return New thread's structure on success, NULL on failure.	255	* @return New thread's structure on success, NULL on failure.
256	*	256	*
257	*/	257	*/
258	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)	258	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)
259	{	259	{
260	thread_t *t;	260	thread_t *t;
261	ipl_t ipl;	261	ipl_t ipl;
262		262
263	t = (thread_t *) slab_alloc(thread_slab, 0);	263	t = (thread_t *) slab_alloc(thread_slab, 0);
264	if (!t)	264	if (!t)
265	return NULL;	265	return NULL;
266		266
267	thread_create_arch(t);	267	thread_create_arch(t);
268		268
269	/* Not needed, but good for debugging */	269	/* Not needed, but good for debugging */
270	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);	270	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);
271		271
272	ipl = interrupts_disable();	272	ipl = interrupts_disable();
273	spinlock_lock(&tidlock);	273	spinlock_lock(&tidlock);
274	t->tid = ++last_tid;	274	t->tid = ++last_tid;
275	spinlock_unlock(&tidlock);	275	spinlock_unlock(&tidlock);
276	interrupts_restore(ipl);	276	interrupts_restore(ipl);
277		277
278	context_save(&t->saved_context);	278	context_save(&t->saved_context);
279	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	279	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
280		280
281	the_initialize((the_t *) t->kstack);	281	the_initialize((the_t *) t->kstack);
282		282
283	ipl = interrupts_disable();	283	ipl = interrupts_disable();
284	t->saved_context.ipl = interrupts_read();	284	t->saved_context.ipl = interrupts_read();
285	interrupts_restore(ipl);	285	interrupts_restore(ipl);
286		286
287	memcpy(t->name, name, THREAD_NAME_BUFLEN);	287	memcpy(t->name, name, THREAD_NAME_BUFLEN);
288		288
289	t->thread_code = func;	289	t->thread_code = func;
290	t->thread_arg = arg;	290	t->thread_arg = arg;
291	t->ticks = -1;	291	t->ticks = -1;
292	t->priority = -1; /* start in rq[0] */	292	t->priority = -1; /* start in rq[0] */
293	t->cpu = NULL;	293	t->cpu = NULL;
294	t->flags = 0;	294	t->flags = 0;
295	t->state = Entering;	295	t->state = Entering;
296	t->call_me = NULL;	296	t->call_me = NULL;
297	t->call_me_with = NULL;	297	t->call_me_with = NULL;
298		298
299	timeout_initialize(&t->sleep_timeout);	299	timeout_initialize(&t->sleep_timeout);
300	t->sleep_queue = NULL;	300	t->sleep_queue = NULL;
301	t->timeout_pending = 0;	301	t->timeout_pending = 0;
302		302
303	t->rwlock_holder_type = RWLOCK_NONE;	303	t->rwlock_holder_type = RWLOCK_NONE;
304		304
305	t->task = task;	305	t->task = task;
306		306
307	t->fpu_context_exists = 0;	307	t->fpu_context_exists = 0;
308	t->fpu_context_engaged = 0;	308	t->fpu_context_engaged = 0;
309		309
310	/*	310	/*
311	* Register this thread in the system-wide list.	311	* Register this thread in the system-wide list.
312	*/	312	*/
313	ipl = interrupts_disable();	313	ipl = interrupts_disable();
314	spinlock_lock(&threads_lock);	314	spinlock_lock(&threads_lock);
315	btree_insert(&threads_btree, (__native) t, (void *) t, NULL);	315	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);
316	spinlock_unlock(&threads_lock);	316	spinlock_unlock(&threads_lock);
317		317
318	/*	318	/*
319	* Attach to the containing task.	319	* Attach to the containing task.
320	*/	320	*/
321	spinlock_lock(&task->lock);	321	spinlock_lock(&task->lock);
322	list_append(&t->th_link, &task->th_head);	322	list_append(&t->th_link, &task->th_head);
323	spinlock_unlock(&task->lock);	323	spinlock_unlock(&task->lock);
324		324
325	interrupts_restore(ipl);	325	interrupts_restore(ipl);
326		326
327	return t;	327	return t;
328	}	328	}
329		329
330	/** Make thread exiting	330	/** Make thread exiting
331	*	331	*
332	* End current thread execution and switch it to the exiting	332	* End current thread execution and switch it to the exiting
333	* state. All pending timeouts are executed.	333	* state. All pending timeouts are executed.
334	*	334	*
335	*/	335	*/
336	void thread_exit(void)	336	void thread_exit(void)
337	{	337	{
338	ipl_t ipl;	338	ipl_t ipl;
339		339
340	restart:	340	restart:
341	ipl = interrupts_disable();	341	ipl = interrupts_disable();
342	spinlock_lock(&THREAD->lock);	342	spinlock_lock(&THREAD->lock);
343	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	343	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
344	spinlock_unlock(&THREAD->lock);	344	spinlock_unlock(&THREAD->lock);
345	interrupts_restore(ipl);	345	interrupts_restore(ipl);
346	goto restart;	346	goto restart;
347	}	347	}
348	THREAD->state = Exiting;	348	THREAD->state = Exiting;
349	spinlock_unlock(&THREAD->lock);	349	spinlock_unlock(&THREAD->lock);
350	scheduler();	350	scheduler();
351	}	351	}
352		352
353		353
354	/** Thread sleep	354	/** Thread sleep
355	*	355	*
356	* Suspend execution of the current thread.	356	* Suspend execution of the current thread.
357	*	357	*
358	* @param sec Number of seconds to sleep.	358	* @param sec Number of seconds to sleep.
359	*	359	*
360	*/	360	*/
361	void thread_sleep(__u32 sec)	361	void thread_sleep(__u32 sec)
362	{	362	{
363	thread_usleep(sec*1000000);	363	thread_usleep(sec*1000000);
364	}	364	}
365		365
366	/** Thread usleep	366	/** Thread usleep
367	*	367	*
368	* Suspend execution of the current thread.	368	* Suspend execution of the current thread.
369	*	369	*
370	* @param usec Number of microseconds to sleep.	370	* @param usec Number of microseconds to sleep.
371	*	371	*
372	*/	372	*/
373	void thread_usleep(__u32 usec)	373	void thread_usleep(__u32 usec)
374	{	374	{
375	waitq_t wq;	375	waitq_t wq;
376		376
377	waitq_initialize(&wq);	377	waitq_initialize(&wq);
378		378
379	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	379	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
380	}	380	}
381		381
382	/** Register thread out-of-context invocation	382	/** Register thread out-of-context invocation
383	*	383	*
384	* Register a function and its argument to be executed	384	* Register a function and its argument to be executed
385	* on next context switch to the current thread.	385	* on next context switch to the current thread.
386	*	386	*
387	* @param call_me Out-of-context function.	387	* @param call_me Out-of-context function.
388	* @param call_me_with Out-of-context function argument.	388	* @param call_me_with Out-of-context function argument.
389	*	389	*
390	*/	390	*/
391	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	391	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
392	{	392	{
393	ipl_t ipl;	393	ipl_t ipl;
394		394
395	ipl = interrupts_disable();	395	ipl = interrupts_disable();
396	spinlock_lock(&THREAD->lock);	396	spinlock_lock(&THREAD->lock);
397	THREAD->call_me = call_me;	397	THREAD->call_me = call_me;
398	THREAD->call_me_with = call_me_with;	398	THREAD->call_me_with = call_me_with;
399	spinlock_unlock(&THREAD->lock);	399	spinlock_unlock(&THREAD->lock);
400	interrupts_restore(ipl);	400	interrupts_restore(ipl);
401	}	401	}
402		402
403	/** Print list of threads debug info */	403	/** Print list of threads debug info */
404	void thread_print_list(void)	404	void thread_print_list(void)
405	{	405	{
406	link_t *cur;	406	link_t *cur;
407	ipl_t ipl;	407	ipl_t ipl;
408		408
409	/* Messing with thread structures, avoid deadlock */	409	/* Messing with thread structures, avoid deadlock */
410	ipl = interrupts_disable();	410	ipl = interrupts_disable();
411	spinlock_lock(&threads_lock);	411	spinlock_lock(&threads_lock);
412		412
413	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {	413	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {
414	btree_node_t *node;	414	btree_node_t *node;
415	int i;	415	int i;
416		416
417	node = list_get_instance(cur, btree_node_t, leaf_link);	417	node = list_get_instance(cur, btree_node_t, leaf_link);
418	for (i = 0; i < node->keys; i++) {	418	for (i = 0; i < node->keys; i++) {
419	thread_t *t;	419	thread_t *t;
420		420
421	t = (thread_t *) node->value[i];	421	t = (thread_t *) node->value[i];
422	printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",	422	printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
423	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);	423	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
424	if (t->cpu)	424	if (t->cpu)
425	printf("cpu%d ", t->cpu->id);	425	printf("cpu%d ", t->cpu->id);
426	else	426	else
427	printf("none");	427	printf("none");
428	printf("\n");	428	printf("\n");
429	}	429	}
430	}	430	}
431		431
432	spinlock_unlock(&threads_lock);	432	spinlock_unlock(&threads_lock);
433	interrupts_restore(ipl);	433	interrupts_restore(ipl);
434	}	434	}
435		435
436	/** Check whether thread exists.	436	/** Check whether thread exists.
437	*	437	*
438	* Note that threads_lock must be already held and	438	* Note that threads_lock must be already held and
439	* interrupts must be already disabled.	439	* interrupts must be already disabled.
440	*	440	*
441	* @param t Pointer to thread.	441	* @param t Pointer to thread.
442	*	442	*
443	* @return True if thread t is known to the system, false otherwise.	443	* @return True if thread t is known to the system, false otherwise.
444	*/	444	*/
445	bool thread_exists(thread_t *t)	445	bool thread_exists(thread_t *t)
446	{	446	{
447	btree_node_t *leaf;	447	btree_node_t *leaf;
448		448
449	return btree_search(&threads_btree, (__native) t, &leaf) != NULL;	449	return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;
450	}	450	}
451		451
452	/** Process syscall to create new thread.	452	/** Process syscall to create new thread.
453	*	453	*
454	*/	454	*/
455	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)	455	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)
456	{	456	{
457	thread_t *t;	457	thread_t *t;
458	char namebuf[THREAD_NAME_BUFLEN];	458	char namebuf[THREAD_NAME_BUFLEN];
459	uspace_arg_t *kernel_uarg;	459	uspace_arg_t *kernel_uarg;
460	__u32 tid;	460	__u32 tid;
461		461
462	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);	462	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
463		463
464	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	464	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
465	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));	465	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
466		466
467	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {	467	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
468	tid = t->tid;	468	tid = t->tid;
469	thread_ready(t);	469	thread_ready(t);
470	return (__native) tid;	470	return (__native) tid;
471	} else {	471	} else {
472	free(kernel_uarg);	472	free(kernel_uarg);
473	}	473	}
474		474
475	return (__native) -1;	475	return (__native) -1;
476	}	476	}
477		477
478	/** Process syscall to terminate thread.	478	/** Process syscall to terminate thread.
479	*	479	*
480	*/	480	*/
481	__native sys_thread_exit(int uspace_status)	481	__native sys_thread_exit(int uspace_status)
482	{	482	{
483	thread_exit();	483	thread_exit();
484	/* Unreachable */	484	/* Unreachable */
485	return 0;	485	return 0;
486	}	486	}
487		487

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/proc/thread.c @ 4537 – Rev 1171 → 1177