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>
 
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=%#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");
            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 1210	Rev 1248
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	/**
-		30	* @file thread.c
-		31	* @brief Thread management functions.
-		32	*/
-		33
29	#include <proc/scheduler.h>	34	#include <proc/scheduler.h>
30	#include <proc/thread.h>	35	#include <proc/thread.h>
31	#include <proc/task.h>	36	#include <proc/task.h>
32	#include <proc/uarg.h>	37	#include <proc/uarg.h>
33	#include <mm/frame.h>	38	#include <mm/frame.h>
34	#include <mm/page.h>	39	#include <mm/page.h>
35	#include <arch/asm.h>	40	#include <arch/asm.h>
36	#include <arch.h>	41	#include <arch.h>
37	#include <synch/synch.h>	42	#include <synch/synch.h>
38	#include <synch/spinlock.h>	43	#include <synch/spinlock.h>
39	#include <synch/waitq.h>	44	#include <synch/waitq.h>
40	#include <synch/rwlock.h>	45	#include <synch/rwlock.h>
41	#include <cpu.h>	46	#include <cpu.h>
42	#include <func.h>	47	#include <func.h>
43	#include <context.h>	48	#include <context.h>
44	#include <adt/btree.h>	49	#include <adt/btree.h>
45	#include <adt/list.h>	50	#include <adt/list.h>
46	#include <typedefs.h>	51	#include <typedefs.h>
47	#include <time/clock.h>	52	#include <time/clock.h>
48	#include <config.h>	53	#include <config.h>
49	#include <arch/interrupt.h>	54	#include <arch/interrupt.h>
50	#include <smp/ipi.h>	55	#include <smp/ipi.h>
51	#include <arch/faddr.h>	56	#include <arch/faddr.h>
52	#include <atomic.h>	57	#include <atomic.h>
53	#include <memstr.h>	58	#include <memstr.h>
54	#include <print.h>	59	#include <print.h>
55	#include <mm/slab.h>	60	#include <mm/slab.h>
56	#include <debug.h>	61	#include <debug.h>
57	#include <main/uinit.h>	62	#include <main/uinit.h>
58		63
59	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	64	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
60		65
61	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */	66	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */
62	SPINLOCK_INITIALIZE(threads_lock);	67	SPINLOCK_INITIALIZE(threads_lock);
63	btree_t threads_btree; /*< B+tree of all threads. /	68	btree_t threads_btree; /*< B+tree of all threads. /
64		69
65	SPINLOCK_INITIALIZE(tidlock);	70	SPINLOCK_INITIALIZE(tidlock);
66	__u32 last_tid = 0;	71	__u32 last_tid = 0;
67		72
68	static slab_cache_t *thread_slab;	73	static slab_cache_t *thread_slab;
69	#ifdef ARCH_HAS_FPU	74	#ifdef ARCH_HAS_FPU
70	slab_cache_t *fpu_context_slab;	75	slab_cache_t *fpu_context_slab;
71	#endif	76	#endif
72		77
73	/** Thread wrapper	78	/** Thread wrapper
74	*	79	*
75	* This wrapper is provided to ensure that every thread	80	* This wrapper is provided to ensure that every thread
76	* makes a call to thread_exit() when its implementing	81	* makes a call to thread_exit() when its implementing
77	* function returns.	82	* function returns.
78	*	83	*
79	* interrupts_disable() is assumed.	84	* interrupts_disable() is assumed.
80	*	85	*
81	*/	86	*/
82	static void cushion(void)	87	static void cushion(void)
83	{	88	{
84	void (f)(void ) = THREAD->thread_code;	89	void (f)(void ) = THREAD->thread_code;
85	void *arg = THREAD->thread_arg;	90	void *arg = THREAD->thread_arg;
86		91
87	/* this is where each thread wakes up after its creation */	92	/* this is where each thread wakes up after its creation */
88	spinlock_unlock(&THREAD->lock);	93	spinlock_unlock(&THREAD->lock);
89	interrupts_enable();	94	interrupts_enable();
90		95
91	f(arg);	96	f(arg);
92	thread_exit();	97	thread_exit();
93	/* not reached */	98	/* not reached */
94	}	99	}
95		100
96	/** Initialization and allocation for thread_t structure */	101	/** Initialization and allocation for thread_t structure */
97	static int thr_constructor(void *obj, int kmflags)	102	static int thr_constructor(void *obj, int kmflags)
98	{	103	{
99	thread_t t = (thread_t )obj;	104	thread_t t = (thread_t )obj;
100	pfn_t pfn;	105	pfn_t pfn;
101	int status;	106	int status;
102		107
103	spinlock_initialize(&t->lock, "thread_t_lock");	108	spinlock_initialize(&t->lock, "thread_t_lock");
104	link_initialize(&t->rq_link);	109	link_initialize(&t->rq_link);
105	link_initialize(&t->wq_link);	110	link_initialize(&t->wq_link);
106	link_initialize(&t->th_link);	111	link_initialize(&t->th_link);
107		112
108	#ifdef ARCH_HAS_FPU	113	#ifdef ARCH_HAS_FPU
109	# ifdef CONFIG_FPU_LAZY	114	# ifdef CONFIG_FPU_LAZY
110	t->saved_fpu_context = NULL;	115	t->saved_fpu_context = NULL;
111	# else	116	# else
112	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	117	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
113	if (!t->saved_fpu_context)	118	if (!t->saved_fpu_context)
114	return -1;	119	return -1;
115	# endif	120	# endif
116	#endif	121	#endif
117		122
118	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	123	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
119	if (status) {	124	if (status) {
120	#ifdef ARCH_HAS_FPU	125	#ifdef ARCH_HAS_FPU
121	if (t->saved_fpu_context)	126	if (t->saved_fpu_context)
122	slab_free(fpu_context_slab,t->saved_fpu_context);	127	slab_free(fpu_context_slab,t->saved_fpu_context);
123	#endif	128	#endif
124	return -1;	129	return -1;
125	}	130	}
126	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	131	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
127		132
128	return 0;	133	return 0;
129	}	134	}
130		135
131	/** Destruction of thread_t object */	136	/** Destruction of thread_t object */
132	static int thr_destructor(void *obj)	137	static int thr_destructor(void *obj)
133	{	138	{
134	thread_t t = (thread_t )obj;	139	thread_t t = (thread_t )obj;
135		140
136	frame_free(ADDR2PFN(KA2PA(t->kstack)));	141	frame_free(ADDR2PFN(KA2PA(t->kstack)));
137	#ifdef ARCH_HAS_FPU	142	#ifdef ARCH_HAS_FPU
138	if (t->saved_fpu_context)	143	if (t->saved_fpu_context)
139	slab_free(fpu_context_slab,t->saved_fpu_context);	144	slab_free(fpu_context_slab,t->saved_fpu_context);
140	#endif	145	#endif
141	return 1; /* One page freed */	146	return 1; /* One page freed */
142	}	147	}
143		148
144	/** Initialize threads	149	/** Initialize threads
145	*	150	*
146	* Initialize kernel threads support.	151	* Initialize kernel threads support.
147	*	152	*
148	*/	153	*/
149	void thread_init(void)	154	void thread_init(void)
150	{	155	{
151	THREAD = NULL;	156	THREAD = NULL;
152	atomic_set(&nrdy,0);	157	atomic_set(&nrdy,0);
153	thread_slab = slab_cache_create("thread_slab",	158	thread_slab = slab_cache_create("thread_slab",
154	sizeof(thread_t),0,	159	sizeof(thread_t),0,
155	thr_constructor, thr_destructor, 0);	160	thr_constructor, thr_destructor, 0);
156	#ifdef ARCH_HAS_FPU	161	#ifdef ARCH_HAS_FPU
157	fpu_context_slab = slab_cache_create("fpu_slab",	162	fpu_context_slab = slab_cache_create("fpu_slab",
158	sizeof(fpu_context_t),	163	sizeof(fpu_context_t),
159	FPU_CONTEXT_ALIGN,	164	FPU_CONTEXT_ALIGN,
160	NULL, NULL, 0);	165	NULL, NULL, 0);
161	#endif	166	#endif
162		167
163	btree_create(&threads_btree);	168	btree_create(&threads_btree);
164	}	169	}
165		170
166	/** Make thread ready	171	/** Make thread ready
167	*	172	*
168	* Switch thread t to the ready state.	173	* Switch thread t to the ready state.
169	*	174	*
170	* @param t Thread to make ready.	175	* @param t Thread to make ready.
171	*	176	*
172	*/	177	*/
173	void thread_ready(thread_t *t)	178	void thread_ready(thread_t *t)
174	{	179	{
175	cpu_t *cpu;	180	cpu_t *cpu;
176	runq_t *r;	181	runq_t *r;
177	ipl_t ipl;	182	ipl_t ipl;
178	int i, avg;	183	int i, avg;
179		184
180	ipl = interrupts_disable();	185	ipl = interrupts_disable();
181		186
182	spinlock_lock(&t->lock);	187	spinlock_lock(&t->lock);
183		188
184	ASSERT(! (t->state == Ready));	189	ASSERT(! (t->state == Ready));
185		190
186	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	191	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
187		192
188	cpu = CPU;	193	cpu = CPU;
189	if (t->flags & X_WIRED) {	194	if (t->flags & X_WIRED) {
190	cpu = t->cpu;	195	cpu = t->cpu;
191	}	196	}
192	t->state = Ready;	197	t->state = Ready;
193	spinlock_unlock(&t->lock);	198	spinlock_unlock(&t->lock);
194		199
195	/*	200	/*
196	* Append t to respective ready queue on respective processor.	201	* Append t to respective ready queue on respective processor.
197	*/	202	*/
198	r = &cpu->rq[i];	203	r = &cpu->rq[i];
199	spinlock_lock(&r->lock);	204	spinlock_lock(&r->lock);
200	list_append(&t->rq_link, &r->rq_head);	205	list_append(&t->rq_link, &r->rq_head);
201	r->n++;	206	r->n++;
202	spinlock_unlock(&r->lock);	207	spinlock_unlock(&r->lock);
203		208
204	atomic_inc(&nrdy);	209	atomic_inc(&nrdy);
205	avg = atomic_get(&nrdy) / config.cpu_active;	210	avg = atomic_get(&nrdy) / config.cpu_active;
206	atomic_inc(&cpu->nrdy);	211	atomic_inc(&cpu->nrdy);
207		212
208	interrupts_restore(ipl);	213	interrupts_restore(ipl);
209	}	214	}
210		215
211	/** Destroy thread memory structure	216	/** Destroy thread memory structure
212	*	217	*
213	* Detach thread from all queues, cpus etc. and destroy it.	218	* Detach thread from all queues, cpus etc. and destroy it.
214	*	219	*
215	* Assume thread->lock is held!!	220	* Assume thread->lock is held!!
216	*/	221	*/
217	void thread_destroy(thread_t *t)	222	void thread_destroy(thread_t *t)
218	{	223	{
219	ASSERT(t->state == Exiting);	224	ASSERT(t->state == Exiting);
220	ASSERT(t->task);	225	ASSERT(t->task);
221	ASSERT(t->cpu);	226	ASSERT(t->cpu);
222		227
223	spinlock_lock(&t->cpu->lock);	228	spinlock_lock(&t->cpu->lock);
224	if(t->cpu->fpu_owner==t)	229	if(t->cpu->fpu_owner==t)
225	t->cpu->fpu_owner=NULL;	230	t->cpu->fpu_owner=NULL;
226	spinlock_unlock(&t->cpu->lock);	231	spinlock_unlock(&t->cpu->lock);
227		232
228	/*	233	/*
229	* Detach from the containing task.	234	* Detach from the containing task.
230	*/	235	*/
231	spinlock_lock(&t->task->lock);	236	spinlock_lock(&t->task->lock);
232	list_remove(&t->th_link);	237	list_remove(&t->th_link);
233	spinlock_unlock(&t->task->lock);	238	spinlock_unlock(&t->task->lock);
234		239
235	spinlock_unlock(&t->lock);	240	spinlock_unlock(&t->lock);
236		241
237	spinlock_lock(&threads_lock);	242	spinlock_lock(&threads_lock);
238	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);	243	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);
239	spinlock_unlock(&threads_lock);	244	spinlock_unlock(&threads_lock);
240		245
241	slab_free(thread_slab, t);	246	slab_free(thread_slab, t);
242	}	247	}
243		248
244	/** Create new thread	249	/** Create new thread
245	*	250	*
246	* Create a new thread.	251	* Create a new thread.
247	*	252	*
248	* @param func Thread's implementing function.	253	* @param func Thread's implementing function.
249	* @param arg Thread's implementing function argument.	254	* @param arg Thread's implementing function argument.
250	* @param task Task to which the thread belongs.	255	* @param task Task to which the thread belongs.
251	* @param flags Thread flags.	256	* @param flags Thread flags.
252	* @param name Symbolic name.	257	* @param name Symbolic name.
253	*	258	*
254	* @return New thread's structure on success, NULL on failure.	259	* @return New thread's structure on success, NULL on failure.
255	*	260	*
256	*/	261	*/
257	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)	262	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)
258	{	263	{
259	thread_t *t;	264	thread_t *t;
260	ipl_t ipl;	265	ipl_t ipl;
261		266
262	t = (thread_t *) slab_alloc(thread_slab, 0);	267	t = (thread_t *) slab_alloc(thread_slab, 0);
263	if (!t)	268	if (!t)
264	return NULL;	269	return NULL;
265		270
266	thread_create_arch(t);	271	thread_create_arch(t);
267		272
268	/* Not needed, but good for debugging */	273	/* Not needed, but good for debugging */
269	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);	274	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);
270		275
271	ipl = interrupts_disable();	276	ipl = interrupts_disable();
272	spinlock_lock(&tidlock);	277	spinlock_lock(&tidlock);
273	t->tid = ++last_tid;	278	t->tid = ++last_tid;
274	spinlock_unlock(&tidlock);	279	spinlock_unlock(&tidlock);
275	interrupts_restore(ipl);	280	interrupts_restore(ipl);
276		281
277	context_save(&t->saved_context);	282	context_save(&t->saved_context);
278	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	283	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
279		284
280	the_initialize((the_t *) t->kstack);	285	the_initialize((the_t *) t->kstack);
281		286
282	ipl = interrupts_disable();	287	ipl = interrupts_disable();
283	t->saved_context.ipl = interrupts_read();	288	t->saved_context.ipl = interrupts_read();
284	interrupts_restore(ipl);	289	interrupts_restore(ipl);
285		290
286	memcpy(t->name, name, THREAD_NAME_BUFLEN);	291	memcpy(t->name, name, THREAD_NAME_BUFLEN);
287		292
288	t->thread_code = func;	293	t->thread_code = func;
289	t->thread_arg = arg;	294	t->thread_arg = arg;
290	t->ticks = -1;	295	t->ticks = -1;
291	t->priority = -1; /* start in rq[0] */	296	t->priority = -1; /* start in rq[0] */
292	t->cpu = NULL;	297	t->cpu = NULL;
293	t->flags = 0;	298	t->flags = 0;
294	t->state = Entering;	299	t->state = Entering;
295	t->call_me = NULL;	300	t->call_me = NULL;
296	t->call_me_with = NULL;	301	t->call_me_with = NULL;
297		302
298	timeout_initialize(&t->sleep_timeout);	303	timeout_initialize(&t->sleep_timeout);
299	t->sleep_queue = NULL;	304	t->sleep_queue = NULL;
300	t->timeout_pending = 0;	305	t->timeout_pending = 0;
301		306
302	t->rwlock_holder_type = RWLOCK_NONE;	307	t->rwlock_holder_type = RWLOCK_NONE;
303		308
304	t->task = task;	309	t->task = task;
305		310
306	t->fpu_context_exists = 0;	311	t->fpu_context_exists = 0;
307	t->fpu_context_engaged = 0;	312	t->fpu_context_engaged = 0;
308		313
309	/*	314	/*
310	* Register this thread in the system-wide list.	315	* Register this thread in the system-wide list.
311	*/	316	*/
312	ipl = interrupts_disable();	317	ipl = interrupts_disable();
313	spinlock_lock(&threads_lock);	318	spinlock_lock(&threads_lock);
314	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);	319	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);
315	spinlock_unlock(&threads_lock);	320	spinlock_unlock(&threads_lock);
316		321
317	/*	322	/*
318	* Attach to the containing task.	323	* Attach to the containing task.
319	*/	324	*/
320	spinlock_lock(&task->lock);	325	spinlock_lock(&task->lock);
321	list_append(&t->th_link, &task->th_head);	326	list_append(&t->th_link, &task->th_head);
322	spinlock_unlock(&task->lock);	327	spinlock_unlock(&task->lock);
323		328
324	interrupts_restore(ipl);	329	interrupts_restore(ipl);
325		330
326	return t;	331	return t;
327	}	332	}
328		333
329	/** Make thread exiting	334	/** Make thread exiting
330	*	335	*
331	* End current thread execution and switch it to the exiting	336	* End current thread execution and switch it to the exiting
332	* state. All pending timeouts are executed.	337	* state. All pending timeouts are executed.
333	*	338	*
334	*/	339	*/
335	void thread_exit(void)	340	void thread_exit(void)
336	{	341	{
337	ipl_t ipl;	342	ipl_t ipl;
338		343
339	restart:	344	restart:
340	ipl = interrupts_disable();	345	ipl = interrupts_disable();
341	spinlock_lock(&THREAD->lock);	346	spinlock_lock(&THREAD->lock);
342	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	347	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
343	spinlock_unlock(&THREAD->lock);	348	spinlock_unlock(&THREAD->lock);
344	interrupts_restore(ipl);	349	interrupts_restore(ipl);
345	goto restart;	350	goto restart;
346	}	351	}
347	THREAD->state = Exiting;	352	THREAD->state = Exiting;
348	spinlock_unlock(&THREAD->lock);	353	spinlock_unlock(&THREAD->lock);
349	scheduler();	354	scheduler();
350	}	355	}
351		356
352		357
353	/** Thread sleep	358	/** Thread sleep
354	*	359	*
355	* Suspend execution of the current thread.	360	* Suspend execution of the current thread.
356	*	361	*
357	* @param sec Number of seconds to sleep.	362	* @param sec Number of seconds to sleep.
358	*	363	*
359	*/	364	*/
360	void thread_sleep(__u32 sec)	365	void thread_sleep(__u32 sec)
361	{	366	{
362	thread_usleep(sec*1000000);	367	thread_usleep(sec*1000000);
363	}	368	}
364		369
365	/** Thread usleep	370	/** Thread usleep
366	*	371	*
367	* Suspend execution of the current thread.	372	* Suspend execution of the current thread.
368	*	373	*
369	* @param usec Number of microseconds to sleep.	374	* @param usec Number of microseconds to sleep.
370	*	375	*
371	*/	376	*/
372	void thread_usleep(__u32 usec)	377	void thread_usleep(__u32 usec)
373	{	378	{
374	waitq_t wq;	379	waitq_t wq;
375		380
376	waitq_initialize(&wq);	381	waitq_initialize(&wq);
377		382
378	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	383	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
379	}	384	}
380		385
381	/** Register thread out-of-context invocation	386	/** Register thread out-of-context invocation
382	*	387	*
383	* Register a function and its argument to be executed	388	* Register a function and its argument to be executed
384	* on next context switch to the current thread.	389	* on next context switch to the current thread.
385	*	390	*
386	* @param call_me Out-of-context function.	391	* @param call_me Out-of-context function.
387	* @param call_me_with Out-of-context function argument.	392	* @param call_me_with Out-of-context function argument.
388	*	393	*
389	*/	394	*/
390	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	395	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
391	{	396	{
392	ipl_t ipl;	397	ipl_t ipl;
393		398
394	ipl = interrupts_disable();	399	ipl = interrupts_disable();
395	spinlock_lock(&THREAD->lock);	400	spinlock_lock(&THREAD->lock);
396	THREAD->call_me = call_me;	401	THREAD->call_me = call_me;
397	THREAD->call_me_with = call_me_with;	402	THREAD->call_me_with = call_me_with;
398	spinlock_unlock(&THREAD->lock);	403	spinlock_unlock(&THREAD->lock);
399	interrupts_restore(ipl);	404	interrupts_restore(ipl);
400	}	405	}
401		406
402	/** Print list of threads debug info */	407	/** Print list of threads debug info */
403	void thread_print_list(void)	408	void thread_print_list(void)
404	{	409	{
405	link_t *cur;	410	link_t *cur;
406	ipl_t ipl;	411	ipl_t ipl;
407		412
408	/* Messing with thread structures, avoid deadlock */	413	/* Messing with thread structures, avoid deadlock */
409	ipl = interrupts_disable();	414	ipl = interrupts_disable();
410	spinlock_lock(&threads_lock);	415	spinlock_lock(&threads_lock);
411		416
412	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {	417	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {
413	btree_node_t *node;	418	btree_node_t *node;
414	int i;	419	int i;
415		420
416	node = list_get_instance(cur, btree_node_t, leaf_link);	421	node = list_get_instance(cur, btree_node_t, leaf_link);
417	for (i = 0; i < node->keys; i++) {	422	for (i = 0; i < node->keys; i++) {
418	thread_t *t;	423	thread_t *t;
419		424
420	t = (thread_t *) node->value[i];	425	t = (thread_t *) node->value[i];
421	printf("%s: address=%#zX, tid=%zd, state=%s, task=%#zX, code=%#zX, stack=%#zX, cpu=",	426	printf("%s: address=%#zX, tid=%zd, state=%s, task=%#zX, code=%#zX, stack=%#zX, cpu=",
422	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);	427	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
423	if (t->cpu)	428	if (t->cpu)
424	printf("cpu%zd ", t->cpu->id);	429	printf("cpu%zd ", t->cpu->id);
425	else	430	else
426	printf("none");	431	printf("none");
427	printf("\n");	432	printf("\n");
428	}	433	}
429	}	434	}
430		435
431	spinlock_unlock(&threads_lock);	436	spinlock_unlock(&threads_lock);
432	interrupts_restore(ipl);	437	interrupts_restore(ipl);
433	}	438	}
434		439
435	/** Check whether thread exists.	440	/** Check whether thread exists.
436	*	441	*
437	* Note that threads_lock must be already held and	442	* Note that threads_lock must be already held and
438	* interrupts must be already disabled.	443	* interrupts must be already disabled.
439	*	444	*
440	* @param t Pointer to thread.	445	* @param t Pointer to thread.
441	*	446	*
442	* @return True if thread t is known to the system, false otherwise.	447	* @return True if thread t is known to the system, false otherwise.
443	*/	448	*/
444	bool thread_exists(thread_t *t)	449	bool thread_exists(thread_t *t)
445	{	450	{
446	btree_node_t *leaf;	451	btree_node_t *leaf;
447		452
448	return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;	453	return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;
449	}	454	}
450		455
451	/** Process syscall to create new thread.	456	/** Process syscall to create new thread.
452	*	457	*
453	*/	458	*/
454	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)	459	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)
455	{	460	{
456	thread_t *t;	461	thread_t *t;
457	char namebuf[THREAD_NAME_BUFLEN];	462	char namebuf[THREAD_NAME_BUFLEN];
458	uspace_arg_t *kernel_uarg;	463	uspace_arg_t *kernel_uarg;
459	__u32 tid;	464	__u32 tid;
460		465
461	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);	466	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
462		467
463	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	468	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
464	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));	469	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
465		470
466	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {	471	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
467	tid = t->tid;	472	tid = t->tid;
468	thread_ready(t);	473	thread_ready(t);
469	return (__native) tid;	474	return (__native) tid;
470	} else {	475	} else {
471	free(kernel_uarg);	476	free(kernel_uarg);
472	}	477	}
473		478
474	return (__native) -1;	479	return (__native) -1;
475	}	480	}
476		481
477	/** Process syscall to terminate thread.	482	/** Process syscall to terminate thread.
478	*	483	*
479	*/	484	*/
480	__native sys_thread_exit(int uspace_status)	485	__native sys_thread_exit(int uspace_status)
481	{	486	{
482	thread_exit();	487	thread_exit();
483	/* Unreachable */	488	/* Unreachable */
484	return 0;	489	return 0;
485	}	490	}
486		491

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/proc/thread.c – Rev 1210 → 1248