WebSVN – HelenOS – 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>
 
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->in_copy_from_uspace = false;
    t->in_copy_to_uspace = false;
   
    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;
    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 1248	Rev 1288
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>
-		64	#include <errno.h>
63		65
64	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	66	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
65		67
66	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */	68	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */
67	SPINLOCK_INITIALIZE(threads_lock);	69	SPINLOCK_INITIALIZE(threads_lock);
68	btree_t threads_btree; /*< B+tree of all threads. /	70	btree_t threads_btree; /*< B+tree of all threads. /
69		71
70	SPINLOCK_INITIALIZE(tidlock);	72	SPINLOCK_INITIALIZE(tidlock);
71	__u32 last_tid = 0;	73	__u32 last_tid = 0;
72		74
73	static slab_cache_t *thread_slab;	75	static slab_cache_t *thread_slab;
74	#ifdef ARCH_HAS_FPU	76	#ifdef ARCH_HAS_FPU
75	slab_cache_t *fpu_context_slab;	77	slab_cache_t *fpu_context_slab;
76	#endif	78	#endif
77		79
78	/** Thread wrapper	80	/** Thread wrapper
79	*	81	*
80	* This wrapper is provided to ensure that every thread	82	* This wrapper is provided to ensure that every thread
81	* makes a call to thread_exit() when its implementing	83	* makes a call to thread_exit() when its implementing
82	* function returns.	84	* function returns.
83	*	85	*
84	* interrupts_disable() is assumed.	86	* interrupts_disable() is assumed.
85	*	87	*
86	*/	88	*/
87	static void cushion(void)	89	static void cushion(void)
88	{	90	{
89	void (f)(void ) = THREAD->thread_code;	91	void (f)(void ) = THREAD->thread_code;
90	void *arg = THREAD->thread_arg;	92	void *arg = THREAD->thread_arg;
91		93
92	/* this is where each thread wakes up after its creation */	94	/* this is where each thread wakes up after its creation */
93	spinlock_unlock(&THREAD->lock);	95	spinlock_unlock(&THREAD->lock);
94	interrupts_enable();	96	interrupts_enable();
95		97
96	f(arg);	98	f(arg);
97	thread_exit();	99	thread_exit();
98	/* not reached */	100	/* not reached */
99	}	101	}
100		102
101	/** Initialization and allocation for thread_t structure */	103	/** Initialization and allocation for thread_t structure */
102	static int thr_constructor(void *obj, int kmflags)	104	static int thr_constructor(void *obj, int kmflags)
103	{	105	{
104	thread_t t = (thread_t )obj;	106	thread_t t = (thread_t )obj;
105	pfn_t pfn;	107	pfn_t pfn;
106	int status;	108	int status;
107		109
108	spinlock_initialize(&t->lock, "thread_t_lock");	110	spinlock_initialize(&t->lock, "thread_t_lock");
109	link_initialize(&t->rq_link);	111	link_initialize(&t->rq_link);
110	link_initialize(&t->wq_link);	112	link_initialize(&t->wq_link);
111	link_initialize(&t->th_link);	113	link_initialize(&t->th_link);
112		114
113	#ifdef ARCH_HAS_FPU	115	#ifdef ARCH_HAS_FPU
114	# ifdef CONFIG_FPU_LAZY	116	# ifdef CONFIG_FPU_LAZY
115	t->saved_fpu_context = NULL;	117	t->saved_fpu_context = NULL;
116	# else	118	# else
117	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	119	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
118	if (!t->saved_fpu_context)	120	if (!t->saved_fpu_context)
119	return -1;	121	return -1;
120	# endif	122	# endif
121	#endif	123	#endif
122		124
123	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	125	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
124	if (status) {	126	if (status) {
125	#ifdef ARCH_HAS_FPU	127	#ifdef ARCH_HAS_FPU
126	if (t->saved_fpu_context)	128	if (t->saved_fpu_context)
127	slab_free(fpu_context_slab,t->saved_fpu_context);	129	slab_free(fpu_context_slab,t->saved_fpu_context);
128	#endif	130	#endif
129	return -1;	131	return -1;
130	}	132	}
131	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	133	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
132		134
133	return 0;	135	return 0;
134	}	136	}
135		137
136	/** Destruction of thread_t object */	138	/** Destruction of thread_t object */
137	static int thr_destructor(void *obj)	139	static int thr_destructor(void *obj)
138	{	140	{
139	thread_t t = (thread_t )obj;	141	thread_t t = (thread_t )obj;
140		142
141	frame_free(ADDR2PFN(KA2PA(t->kstack)));	143	frame_free(ADDR2PFN(KA2PA(t->kstack)));
142	#ifdef ARCH_HAS_FPU	144	#ifdef ARCH_HAS_FPU
143	if (t->saved_fpu_context)	145	if (t->saved_fpu_context)
144	slab_free(fpu_context_slab,t->saved_fpu_context);	146	slab_free(fpu_context_slab,t->saved_fpu_context);
145	#endif	147	#endif
146	return 1; /* One page freed */	148	return 1; /* One page freed */
147	}	149	}
148		150
149	/** Initialize threads	151	/** Initialize threads
150	*	152	*
151	* Initialize kernel threads support.	153	* Initialize kernel threads support.
152	*	154	*
153	*/	155	*/
154	void thread_init(void)	156	void thread_init(void)
155	{	157	{
156	THREAD = NULL;	158	THREAD = NULL;
157	atomic_set(&nrdy,0);	159	atomic_set(&nrdy,0);
158	thread_slab = slab_cache_create("thread_slab",	160	thread_slab = slab_cache_create("thread_slab",
159	sizeof(thread_t),0,	161	sizeof(thread_t),0,
160	thr_constructor, thr_destructor, 0);	162	thr_constructor, thr_destructor, 0);
161	#ifdef ARCH_HAS_FPU	163	#ifdef ARCH_HAS_FPU
162	fpu_context_slab = slab_cache_create("fpu_slab",	164	fpu_context_slab = slab_cache_create("fpu_slab",
163	sizeof(fpu_context_t),	165	sizeof(fpu_context_t),
164	FPU_CONTEXT_ALIGN,	166	FPU_CONTEXT_ALIGN,
165	NULL, NULL, 0);	167	NULL, NULL, 0);
166	#endif	168	#endif
167		169
168	btree_create(&threads_btree);	170	btree_create(&threads_btree);
169	}	171	}
170		172
171	/** Make thread ready	173	/** Make thread ready
172	*	174	*
173	* Switch thread t to the ready state.	175	* Switch thread t to the ready state.
174	*	176	*
175	* @param t Thread to make ready.	177	* @param t Thread to make ready.
176	*	178	*
177	*/	179	*/
178	void thread_ready(thread_t *t)	180	void thread_ready(thread_t *t)
179	{	181	{
180	cpu_t *cpu;	182	cpu_t *cpu;
181	runq_t *r;	183	runq_t *r;
182	ipl_t ipl;	184	ipl_t ipl;
183	int i, avg;	185	int i, avg;
184		186
185	ipl = interrupts_disable();	187	ipl = interrupts_disable();
186		188
187	spinlock_lock(&t->lock);	189	spinlock_lock(&t->lock);
188		190
189	ASSERT(! (t->state == Ready));	191	ASSERT(! (t->state == Ready));
190		192
191	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	193	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
192		194
193	cpu = CPU;	195	cpu = CPU;
194	if (t->flags & X_WIRED) {	196	if (t->flags & X_WIRED) {
195	cpu = t->cpu;	197	cpu = t->cpu;
196	}	198	}
197	t->state = Ready;	199	t->state = Ready;
198	spinlock_unlock(&t->lock);	200	spinlock_unlock(&t->lock);
199		201
200	/*	202	/*
201	* Append t to respective ready queue on respective processor.	203	* Append t to respective ready queue on respective processor.
202	*/	204	*/
203	r = &cpu->rq[i];	205	r = &cpu->rq[i];
204	spinlock_lock(&r->lock);	206	spinlock_lock(&r->lock);
205	list_append(&t->rq_link, &r->rq_head);	207	list_append(&t->rq_link, &r->rq_head);
206	r->n++;	208	r->n++;
207	spinlock_unlock(&r->lock);	209	spinlock_unlock(&r->lock);
208		210
209	atomic_inc(&nrdy);	211	atomic_inc(&nrdy);
210	avg = atomic_get(&nrdy) / config.cpu_active;	212	avg = atomic_get(&nrdy) / config.cpu_active;
211	atomic_inc(&cpu->nrdy);	213	atomic_inc(&cpu->nrdy);
212		214
213	interrupts_restore(ipl);	215	interrupts_restore(ipl);
214	}	216	}
215		217
216	/** Destroy thread memory structure	218	/** Destroy thread memory structure
217	*	219	*
218	* Detach thread from all queues, cpus etc. and destroy it.	220	* Detach thread from all queues, cpus etc. and destroy it.
219	*	221	*
220	* Assume thread->lock is held!!	222	* Assume thread->lock is held!!
221	*/	223	*/
222	void thread_destroy(thread_t *t)	224	void thread_destroy(thread_t *t)
223	{	225	{
224	ASSERT(t->state == Exiting);	226	ASSERT(t->state == Exiting);
225	ASSERT(t->task);	227	ASSERT(t->task);
226	ASSERT(t->cpu);	228	ASSERT(t->cpu);
227		229
228	spinlock_lock(&t->cpu->lock);	230	spinlock_lock(&t->cpu->lock);
229	if(t->cpu->fpu_owner==t)	231	if(t->cpu->fpu_owner==t)
230	t->cpu->fpu_owner=NULL;	232	t->cpu->fpu_owner=NULL;
231	spinlock_unlock(&t->cpu->lock);	233	spinlock_unlock(&t->cpu->lock);
232		234
233	/*	235	/*
234	* Detach from the containing task.	236	* Detach from the containing task.
235	*/	237	*/
236	spinlock_lock(&t->task->lock);	238	spinlock_lock(&t->task->lock);
237	list_remove(&t->th_link);	239	list_remove(&t->th_link);
238	spinlock_unlock(&t->task->lock);	240	spinlock_unlock(&t->task->lock);
239		241
240	spinlock_unlock(&t->lock);	242	spinlock_unlock(&t->lock);
241		243
242	spinlock_lock(&threads_lock);	244	spinlock_lock(&threads_lock);
243	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);	245	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);
244	spinlock_unlock(&threads_lock);	246	spinlock_unlock(&threads_lock);
245		247
246	slab_free(thread_slab, t);	248	slab_free(thread_slab, t);
247	}	249	}
248		250
249	/** Create new thread	251	/** Create new thread
250	*	252	*
251	* Create a new thread.	253	* Create a new thread.
252	*	254	*
253	* @param func Thread's implementing function.	255	* @param func Thread's implementing function.
254	* @param arg Thread's implementing function argument.	256	* @param arg Thread's implementing function argument.
255	* @param task Task to which the thread belongs.	257	* @param task Task to which the thread belongs.
256	* @param flags Thread flags.	258	* @param flags Thread flags.
257	* @param name Symbolic name.	259	* @param name Symbolic name.
258	*	260	*
259	* @return New thread's structure on success, NULL on failure.	261	* @return New thread's structure on success, NULL on failure.
260	*	262	*
261	*/	263	*/
262	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)	264	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)
263	{	265	{
264	thread_t *t;	266	thread_t *t;
265	ipl_t ipl;	267	ipl_t ipl;
266		268
267	t = (thread_t *) slab_alloc(thread_slab, 0);	269	t = (thread_t *) slab_alloc(thread_slab, 0);
268	if (!t)	270	if (!t)
269	return NULL;	271	return NULL;
270		272
271	thread_create_arch(t);	273	thread_create_arch(t);
272		274
273	/* Not needed, but good for debugging */	275	/* Not needed, but good for debugging */
274	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);	276	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);
275		277
276	ipl = interrupts_disable();	278	ipl = interrupts_disable();
277	spinlock_lock(&tidlock);	279	spinlock_lock(&tidlock);
278	t->tid = ++last_tid;	280	t->tid = ++last_tid;
279	spinlock_unlock(&tidlock);	281	spinlock_unlock(&tidlock);
280	interrupts_restore(ipl);	282	interrupts_restore(ipl);
281		283
282	context_save(&t->saved_context);	284	context_save(&t->saved_context);
283	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	285	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
284		286
285	the_initialize((the_t *) t->kstack);	287	the_initialize((the_t *) t->kstack);
286		288
287	ipl = interrupts_disable();	289	ipl = interrupts_disable();
288	t->saved_context.ipl = interrupts_read();	290	t->saved_context.ipl = interrupts_read();
289	interrupts_restore(ipl);	291	interrupts_restore(ipl);
290		292
291	memcpy(t->name, name, THREAD_NAME_BUFLEN);	293	memcpy(t->name, name, THREAD_NAME_BUFLEN);
292		294
293	t->thread_code = func;	295	t->thread_code = func;
294	t->thread_arg = arg;	296	t->thread_arg = arg;
295	t->ticks = -1;	297	t->ticks = -1;
296	t->priority = -1; /* start in rq[0] */	298	t->priority = -1; /* start in rq[0] */
297	t->cpu = NULL;	299	t->cpu = NULL;
298	t->flags = 0;	300	t->flags = 0;
299	t->state = Entering;	301	t->state = Entering;
300	t->call_me = NULL;	302	t->call_me = NULL;
301	t->call_me_with = NULL;	303	t->call_me_with = NULL;
302		304
303	timeout_initialize(&t->sleep_timeout);	305	timeout_initialize(&t->sleep_timeout);
304	t->sleep_queue = NULL;	306	t->sleep_queue = NULL;
305	t->timeout_pending = 0;	307	t->timeout_pending = 0;
-		308
-		309	t->in_copy_from_uspace = false;
-		310	t->in_copy_to_uspace = false;
306		311
307	t->rwlock_holder_type = RWLOCK_NONE;	312	t->rwlock_holder_type = RWLOCK_NONE;
308		313
309	t->task = task;	314	t->task = task;
310		315
311	t->fpu_context_exists = 0;	316	t->fpu_context_exists = 0;
312	t->fpu_context_engaged = 0;	317	t->fpu_context_engaged = 0;
313		318
314	/*	319	/*
315	* Register this thread in the system-wide list.	320	* Register this thread in the system-wide list.
316	*/	321	*/
317	ipl = interrupts_disable();	322	ipl = interrupts_disable();
318	spinlock_lock(&threads_lock);	323	spinlock_lock(&threads_lock);
319	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);	324	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);
320	spinlock_unlock(&threads_lock);	325	spinlock_unlock(&threads_lock);
321		326
322	/*	327	/*
323	* Attach to the containing task.	328	* Attach to the containing task.
324	*/	329	*/
325	spinlock_lock(&task->lock);	330	spinlock_lock(&task->lock);
326	list_append(&t->th_link, &task->th_head);	331	list_append(&t->th_link, &task->th_head);
327	spinlock_unlock(&task->lock);	332	spinlock_unlock(&task->lock);
328		333
329	interrupts_restore(ipl);	334	interrupts_restore(ipl);
330		335
331	return t;	336	return t;
332	}	337	}
333		338
334	/** Make thread exiting	339	/** Make thread exiting
335	*	340	*
336	* End current thread execution and switch it to the exiting	341	* End current thread execution and switch it to the exiting
337	* state. All pending timeouts are executed.	342	* state. All pending timeouts are executed.
338	*	343	*
339	*/	344	*/
340	void thread_exit(void)	345	void thread_exit(void)
341	{	346	{
342	ipl_t ipl;	347	ipl_t ipl;
343		348
344	restart:	349	restart:
345	ipl = interrupts_disable();	350	ipl = interrupts_disable();
346	spinlock_lock(&THREAD->lock);	351	spinlock_lock(&THREAD->lock);
347	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	352	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
348	spinlock_unlock(&THREAD->lock);	353	spinlock_unlock(&THREAD->lock);
349	interrupts_restore(ipl);	354	interrupts_restore(ipl);
350	goto restart;	355	goto restart;
351	}	356	}
352	THREAD->state = Exiting;	357	THREAD->state = Exiting;
353	spinlock_unlock(&THREAD->lock);	358	spinlock_unlock(&THREAD->lock);
354	scheduler();	359	scheduler();
355	}	360	}
356		361
357		362
358	/** Thread sleep	363	/** Thread sleep
359	*	364	*
360	* Suspend execution of the current thread.	365	* Suspend execution of the current thread.
361	*	366	*
362	* @param sec Number of seconds to sleep.	367	* @param sec Number of seconds to sleep.
363	*	368	*
364	*/	369	*/
365	void thread_sleep(__u32 sec)	370	void thread_sleep(__u32 sec)
366	{	371	{
367	thread_usleep(sec*1000000);	372	thread_usleep(sec*1000000);
368	}	373	}
369		374
370	/** Thread usleep	375	/** Thread usleep
371	*	376	*
372	* Suspend execution of the current thread.	377	* Suspend execution of the current thread.
373	*	378	*
374	* @param usec Number of microseconds to sleep.	379	* @param usec Number of microseconds to sleep.
375	*	380	*
376	*/	381	*/
377	void thread_usleep(__u32 usec)	382	void thread_usleep(__u32 usec)
378	{	383	{
379	waitq_t wq;	384	waitq_t wq;
380		385
381	waitq_initialize(&wq);	386	waitq_initialize(&wq);
382		387
383	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	388	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
384	}	389	}
385		390
386	/** Register thread out-of-context invocation	391	/** Register thread out-of-context invocation
387	*	392	*
388	* Register a function and its argument to be executed	393	* Register a function and its argument to be executed
389	* on next context switch to the current thread.	394	* on next context switch to the current thread.
390	*	395	*
391	* @param call_me Out-of-context function.	396	* @param call_me Out-of-context function.
392	* @param call_me_with Out-of-context function argument.	397	* @param call_me_with Out-of-context function argument.
393	*	398	*
394	*/	399	*/
395	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	400	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
396	{	401	{
397	ipl_t ipl;	402	ipl_t ipl;
398		403
399	ipl = interrupts_disable();	404	ipl = interrupts_disable();
400	spinlock_lock(&THREAD->lock);	405	spinlock_lock(&THREAD->lock);
401	THREAD->call_me = call_me;	406	THREAD->call_me = call_me;
402	THREAD->call_me_with = call_me_with;	407	THREAD->call_me_with = call_me_with;
403	spinlock_unlock(&THREAD->lock);	408	spinlock_unlock(&THREAD->lock);
404	interrupts_restore(ipl);	409	interrupts_restore(ipl);
405	}	410	}
406		411
407	/** Print list of threads debug info */	412	/** Print list of threads debug info */
408	void thread_print_list(void)	413	void thread_print_list(void)
409	{	414	{
410	link_t *cur;	415	link_t *cur;
411	ipl_t ipl;	416	ipl_t ipl;
412		417
413	/* Messing with thread structures, avoid deadlock */	418	/* Messing with thread structures, avoid deadlock */
414	ipl = interrupts_disable();	419	ipl = interrupts_disable();
415	spinlock_lock(&threads_lock);	420	spinlock_lock(&threads_lock);
416		421
417	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {	422	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {
418	btree_node_t *node;	423	btree_node_t *node;
419	int i;	424	int i;
420		425
421	node = list_get_instance(cur, btree_node_t, leaf_link);	426	node = list_get_instance(cur, btree_node_t, leaf_link);
422	for (i = 0; i < node->keys; i++) {	427	for (i = 0; i < node->keys; i++) {
423	thread_t *t;	428	thread_t *t;
424		429
425	t = (thread_t *) node->value[i];	430	t = (thread_t *) node->value[i];
426	printf("%s: address=%#zX, tid=%zd, state=%s, task=%#zX, code=%#zX, stack=%#zX, cpu=",	431	printf("%s: address=%#zX, tid=%zd, state=%s, task=%#zX, code=%#zX, stack=%#zX, cpu=",
427	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);	432	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
428	if (t->cpu)	433	if (t->cpu)
429	printf("cpu%zd ", t->cpu->id);	434	printf("cpu%zd ", t->cpu->id);
430	else	435	else
431	printf("none");	436	printf("none");
432	printf("\n");	437	printf("\n");
433	}	438	}
434	}	439	}
435		440
436	spinlock_unlock(&threads_lock);	441	spinlock_unlock(&threads_lock);
437	interrupts_restore(ipl);	442	interrupts_restore(ipl);
438	}	443	}
439		444
440	/** Check whether thread exists.	445	/** Check whether thread exists.
441	*	446	*
442	* Note that threads_lock must be already held and	447	* Note that threads_lock must be already held and
443	* interrupts must be already disabled.	448	* interrupts must be already disabled.
444	*	449	*
445	* @param t Pointer to thread.	450	* @param t Pointer to thread.
446	*	451	*
447	* @return True if thread t is known to the system, false otherwise.	452	* @return True if thread t is known to the system, false otherwise.
448	*/	453	*/
449	bool thread_exists(thread_t *t)	454	bool thread_exists(thread_t *t)
450	{	455	{
451	btree_node_t *leaf;	456	btree_node_t *leaf;
452		457
453	return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;	458	return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;
454	}	459	}
455		460
456	/** Process syscall to create new thread.	461	/** Process syscall to create new thread.
457	*	462	*
458	*/	463	*/
459	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)	464	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)
460	{	465	{
461	thread_t *t;	466	thread_t *t;
462	char namebuf[THREAD_NAME_BUFLEN];	467	char namebuf[THREAD_NAME_BUFLEN];
463	uspace_arg_t *kernel_uarg;	468	uspace_arg_t *kernel_uarg;
464	__u32 tid;	469	__u32 tid;
-		470	int rc;
465		471
466	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);	472	rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
-		473	if (rc != 0)
-		474	return (__native) rc;
467		475
468	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	476	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
469	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));	477	rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
-		478	if (rc != 0) {
-		479	free(kernel_uarg);
-		480	return (__native) rc;
-		481	}
470		482
471	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {	483	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
472	tid = t->tid;	484	tid = t->tid;
473	thread_ready(t);	485	thread_ready(t);
474	return (__native) tid;	486	return (__native) tid;
475	} else {	487	} else {
476	free(kernel_uarg);	488	free(kernel_uarg);
477	}	489	}
478		490
479	return (__native) -1;	491	return (__native) ENOMEM;
480	}	492	}
481		493
482	/** Process syscall to terminate thread.	494	/** Process syscall to terminate thread.
483	*	495	*
484	*/	496	*/
485	__native sys_thread_exit(int uspace_status)	497	__native sys_thread_exit(int uspace_status)
486	{	498	{
487	thread_exit();	499	thread_exit();
488	/* Unreachable */	500	/* Unreachable */

Subversion Repositories HelenOS

(root)/kernel/trunk/generic/src/proc/thread.c – Rev 1248 → 1288