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


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * @file    thread.c
 * @brief   Thread management functions.
 */
 
#include <proc/scheduler.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <proc/uarg.h>
#include <mm/frame.h>
#include <mm/page.h>
#include <arch/asm.h>
#include <arch.h>
#include <synch/synch.h>
#include <synch/spinlock.h>
#include <synch/waitq.h>
#include <synch/rwlock.h>
#include <cpu.h>
#include <func.h>
#include <context.h>
#include <adt/btree.h>
#include <adt/list.h>
#include <typedefs.h>
#include <time/clock.h>
#include <config.h>
#include <arch/interrupt.h>
#include <smp/ipi.h>
#include <arch/faddr.h>
#include <atomic.h>
#include <memstr.h>
#include <print.h>
#include <mm/slab.h>
#include <debug.h>
#include <main/uinit.h>
#include <syscall/copy.h>
#include <errno.h>
 
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_interruptible = false;
    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_FLAGS_NON_BLOCKING);
}
 
/** Register thread out-of-context invocation
 *
 * Register a function and its argument to be executed
 * on next context switch to the current thread.
 *
 * @param call_me      Out-of-context function.
 * @param call_me_with Out-of-context function argument.
 *
 */
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
{
    ipl_t ipl;
   
    ipl = interrupts_disable();
    spinlock_lock(&THREAD->lock);
    THREAD->call_me = call_me;
    THREAD->call_me_with = call_me_with;
    spinlock_unlock(&THREAD->lock);
    interrupts_restore(ipl);
}
 
/** Print list of threads debug info */
void thread_print_list(void)
{
    link_t *cur;
    ipl_t ipl;
   
    /* Messing with thread structures, avoid deadlock */
    ipl = interrupts_disable();
    spinlock_lock(&threads_lock);
 
    for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {
        btree_node_t *node;
        int i;
 
        node = list_get_instance(cur, btree_node_t, leaf_link);
        for (i = 0; i < node->keys; i++) {
            thread_t *t;
       
            t = (thread_t *) node->value[i];
            printf("%s: address=%#zX, tid=%zd, state=%s, task=%#zX, code=%#zX, stack=%#zX, cpu=",
                t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
            if (t->cpu)
                printf("cpu%zd", t->cpu->id);
            else
                printf("none");
            if (t->state == Sleeping) {
                printf(", kst=%#zX", t->kstack);
                printf(", wq=%#zX", t->sleep_queue);
            }
            printf("\n");
        }
    }
 
    spinlock_unlock(&threads_lock);
    interrupts_restore(ipl);
}
 
/** Check whether thread exists.
 *
 * Note that threads_lock must be already held and
 * interrupts must be already disabled.
 *
 * @param t Pointer to thread.
 *
 * @return True if thread t is known to the system, false otherwise.
 */
bool thread_exists(thread_t *t)
{
    btree_node_t *leaf;
   
    return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;
}
 
/** Process syscall to create new thread.
 *
 */
__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name)
{
    thread_t *t;
    char namebuf[THREAD_NAME_BUFLEN];
    uspace_arg_t *kernel_uarg;
    __u32 tid;
    int rc;
 
    rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
    if (rc != 0)
        return (__native) rc;
 
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
    rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
    if (rc != 0) {
        free(kernel_uarg);
        return (__native) rc;
    }
 
    if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
        tid = t->tid;
        thread_ready(t);
        return (__native) tid;
    } else {
        free(kernel_uarg);
    }
 
    return (__native) ENOMEM;
}
 
/** Process syscall to terminate thread.
 *
 */
__native sys_thread_exit(int uspace_status)
{
    thread_exit();
    /* Unreachable */
    return 0;
}
 

Rev 1458	Rev 1502
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/**	29	/**
30	* @file thread.c	30	* @file thread.c
31	* @brief Thread management functions.	31	* @brief Thread management functions.
32	*/	32	*/
33		33
34	#include <proc/scheduler.h>	34	#include <proc/scheduler.h>
35	#include <proc/thread.h>	35	#include <proc/thread.h>
36	#include <proc/task.h>	36	#include <proc/task.h>
37	#include <proc/uarg.h>	37	#include <proc/uarg.h>
38	#include <mm/frame.h>	38	#include <mm/frame.h>
39	#include <mm/page.h>	39	#include <mm/page.h>
40	#include <arch/asm.h>	40	#include <arch/asm.h>
41	#include <arch.h>	41	#include <arch.h>
42	#include <synch/synch.h>	42	#include <synch/synch.h>
43	#include <synch/spinlock.h>	43	#include <synch/spinlock.h>
44	#include <synch/waitq.h>	44	#include <synch/waitq.h>
45	#include <synch/rwlock.h>	45	#include <synch/rwlock.h>
46	#include <cpu.h>	46	#include <cpu.h>
47	#include <func.h>	47	#include <func.h>
48	#include <context.h>	48	#include <context.h>
49	#include <adt/btree.h>	49	#include <adt/btree.h>
50	#include <adt/list.h>	50	#include <adt/list.h>
51	#include <typedefs.h>	51	#include <typedefs.h>
52	#include <time/clock.h>	52	#include <time/clock.h>
53	#include <config.h>	53	#include <config.h>
54	#include <arch/interrupt.h>	54	#include <arch/interrupt.h>
55	#include <smp/ipi.h>	55	#include <smp/ipi.h>
56	#include <arch/faddr.h>	56	#include <arch/faddr.h>
57	#include <atomic.h>	57	#include <atomic.h>
58	#include <memstr.h>	58	#include <memstr.h>
59	#include <print.h>	59	#include <print.h>
60	#include <mm/slab.h>	60	#include <mm/slab.h>
61	#include <debug.h>	61	#include <debug.h>
62	#include <main/uinit.h>	62	#include <main/uinit.h>
63	#include <syscall/copy.h>	63	#include <syscall/copy.h>
64	#include <errno.h>	64	#include <errno.h>
65		65
66	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	66	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
67		67
68	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */	68	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */
69	SPINLOCK_INITIALIZE(threads_lock);	69	SPINLOCK_INITIALIZE(threads_lock);
70	btree_t threads_btree; /*< B+tree of all threads. /	70	btree_t threads_btree; /*< B+tree of all threads. /
71		71
72	SPINLOCK_INITIALIZE(tidlock);	72	SPINLOCK_INITIALIZE(tidlock);
73	__u32 last_tid = 0;	73	__u32 last_tid = 0;
74		74
75	static slab_cache_t *thread_slab;	75	static slab_cache_t *thread_slab;
76	#ifdef ARCH_HAS_FPU	76	#ifdef ARCH_HAS_FPU
77	slab_cache_t *fpu_context_slab;	77	slab_cache_t *fpu_context_slab;
78	#endif	78	#endif
79		79
80	/** Thread wrapper	80	/** Thread wrapper
81	*	81	*
82	* This wrapper is provided to ensure that every thread	82	* This wrapper is provided to ensure that every thread
83	* makes a call to thread_exit() when its implementing	83	* makes a call to thread_exit() when its implementing
84	* function returns.	84	* function returns.
85	*	85	*
86	* interrupts_disable() is assumed.	86	* interrupts_disable() is assumed.
87	*	87	*
88	*/	88	*/
89	static void cushion(void)	89	static void cushion(void)
90	{	90	{
91	void (f)(void ) = THREAD->thread_code;	91	void (f)(void ) = THREAD->thread_code;
92	void *arg = THREAD->thread_arg;	92	void *arg = THREAD->thread_arg;
93		93
94	/* this is where each thread wakes up after its creation */	94	/* this is where each thread wakes up after its creation */
95	spinlock_unlock(&THREAD->lock);	95	spinlock_unlock(&THREAD->lock);
96	interrupts_enable();	96	interrupts_enable();
97		97
98	f(arg);	98	f(arg);
99	thread_exit();	99	thread_exit();
100	/* not reached */	100	/* not reached */
101	}	101	}
102		102
103	/** Initialization and allocation for thread_t structure */	103	/** Initialization and allocation for thread_t structure */
104	static int thr_constructor(void *obj, int kmflags)	104	static int thr_constructor(void *obj, int kmflags)
105	{	105	{
106	thread_t t = (thread_t )obj;	106	thread_t t = (thread_t )obj;
107	pfn_t pfn;	107	pfn_t pfn;
108	int status;	108	int status;
109		109
110	spinlock_initialize(&t->lock, "thread_t_lock");	110	spinlock_initialize(&t->lock, "thread_t_lock");
111	link_initialize(&t->rq_link);	111	link_initialize(&t->rq_link);
112	link_initialize(&t->wq_link);	112	link_initialize(&t->wq_link);
113	link_initialize(&t->th_link);	113	link_initialize(&t->th_link);
114		114
115	#ifdef ARCH_HAS_FPU	115	#ifdef ARCH_HAS_FPU
116	# ifdef CONFIG_FPU_LAZY	116	# ifdef CONFIG_FPU_LAZY
117	t->saved_fpu_context = NULL;	117	t->saved_fpu_context = NULL;
118	# else	118	# else
119	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	119	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
120	if (!t->saved_fpu_context)	120	if (!t->saved_fpu_context)
121	return -1;	121	return -1;
122	# endif	122	# endif
123	#endif	123	#endif
124		124
125	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	125	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
126	if (status) {	126	if (status) {
127	#ifdef ARCH_HAS_FPU	127	#ifdef ARCH_HAS_FPU
128	if (t->saved_fpu_context)	128	if (t->saved_fpu_context)
129	slab_free(fpu_context_slab,t->saved_fpu_context);	129	slab_free(fpu_context_slab,t->saved_fpu_context);
130	#endif	130	#endif
131	return -1;	131	return -1;
132	}	132	}
133	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	133	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
134		134
135	return 0;	135	return 0;
136	}	136	}
137		137
138	/** Destruction of thread_t object */	138	/** Destruction of thread_t object */
139	static int thr_destructor(void *obj)	139	static int thr_destructor(void *obj)
140	{	140	{
141	thread_t t = (thread_t )obj;	141	thread_t t = (thread_t )obj;
142		142
143	frame_free(ADDR2PFN(KA2PA(t->kstack)));	143	frame_free(ADDR2PFN(KA2PA(t->kstack)));
144	#ifdef ARCH_HAS_FPU	144	#ifdef ARCH_HAS_FPU
145	if (t->saved_fpu_context)	145	if (t->saved_fpu_context)
146	slab_free(fpu_context_slab,t->saved_fpu_context);	146	slab_free(fpu_context_slab,t->saved_fpu_context);
147	#endif	147	#endif
148	return 1; /* One page freed */	148	return 1; /* One page freed */
149	}	149	}
150		150
151	/** Initialize threads	151	/** Initialize threads
152	*	152	*
153	* Initialize kernel threads support.	153	* Initialize kernel threads support.
154	*	154	*
155	*/	155	*/
156	void thread_init(void)	156	void thread_init(void)
157	{	157	{
158	THREAD = NULL;	158	THREAD = NULL;
159	atomic_set(&nrdy,0);	159	atomic_set(&nrdy,0);
160	thread_slab = slab_cache_create("thread_slab",	160	thread_slab = slab_cache_create("thread_slab",
161	sizeof(thread_t),0,	161	sizeof(thread_t),0,
162	thr_constructor, thr_destructor, 0);	162	thr_constructor, thr_destructor, 0);
163	#ifdef ARCH_HAS_FPU	163	#ifdef ARCH_HAS_FPU
164	fpu_context_slab = slab_cache_create("fpu_slab",	164	fpu_context_slab = slab_cache_create("fpu_slab",
165	sizeof(fpu_context_t),	165	sizeof(fpu_context_t),
166	FPU_CONTEXT_ALIGN,	166	FPU_CONTEXT_ALIGN,
167	NULL, NULL, 0);	167	NULL, NULL, 0);
168	#endif	168	#endif
169		169
170	btree_create(&threads_btree);	170	btree_create(&threads_btree);
171	}	171	}
172		172
173	/** Make thread ready	173	/** Make thread ready
174	*	174	*
175	* Switch thread t to the ready state.	175	* Switch thread t to the ready state.
176	*	176	*
177	* @param t Thread to make ready.	177	* @param t Thread to make ready.
178	*	178	*
179	*/	179	*/
180	void thread_ready(thread_t *t)	180	void thread_ready(thread_t *t)
181	{	181	{
182	cpu_t *cpu;	182	cpu_t *cpu;
183	runq_t *r;	183	runq_t *r;
184	ipl_t ipl;	184	ipl_t ipl;
185	int i, avg;	185	int i, avg;
186		186
187	ipl = interrupts_disable();	187	ipl = interrupts_disable();
188		188
189	spinlock_lock(&t->lock);	189	spinlock_lock(&t->lock);
190		190
191	ASSERT(! (t->state == Ready));	191	ASSERT(! (t->state == Ready));
192		192
193	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	193	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
194		194
195	cpu = CPU;	195	cpu = CPU;
196	if (t->flags & X_WIRED) {	196	if (t->flags & X_WIRED) {
197	cpu = t->cpu;	197	cpu = t->cpu;
198	}	198	}
199	t->state = Ready;	199	t->state = Ready;
200	spinlock_unlock(&t->lock);	200	spinlock_unlock(&t->lock);
201		201
202	/*	202	/*
203	* Append t to respective ready queue on respective processor.	203	* Append t to respective ready queue on respective processor.
204	*/	204	*/
205	r = &cpu->rq[i];	205	r = &cpu->rq[i];
206	spinlock_lock(&r->lock);	206	spinlock_lock(&r->lock);
207	list_append(&t->rq_link, &r->rq_head);	207	list_append(&t->rq_link, &r->rq_head);
208	r->n++;	208	r->n++;
209	spinlock_unlock(&r->lock);	209	spinlock_unlock(&r->lock);
210		210
211	atomic_inc(&nrdy);	211	atomic_inc(&nrdy);
212	avg = atomic_get(&nrdy) / config.cpu_active;	212	avg = atomic_get(&nrdy) / config.cpu_active;
213	atomic_inc(&cpu->nrdy);	213	atomic_inc(&cpu->nrdy);
214		214
215	interrupts_restore(ipl);	215	interrupts_restore(ipl);
216	}	216	}
217		217
218	/** Destroy thread memory structure	218	/** Destroy thread memory structure
219	*	219	*
220	* Detach thread from all queues, cpus etc. and destroy it.	220	* Detach thread from all queues, cpus etc. and destroy it.
221	*	221	*
222	* Assume thread->lock is held!!	222	* Assume thread->lock is held!!
223	*/	223	*/
224	void thread_destroy(thread_t *t)	224	void thread_destroy(thread_t *t)
225	{	225	{
226	ASSERT(t->state == Exiting);	226	ASSERT(t->state == Exiting);
227	ASSERT(t->task);	227	ASSERT(t->task);
228	ASSERT(t->cpu);	228	ASSERT(t->cpu);
229		229
230	spinlock_lock(&t->cpu->lock);	230	spinlock_lock(&t->cpu->lock);
231	if(t->cpu->fpu_owner==t)	231	if(t->cpu->fpu_owner==t)
232	t->cpu->fpu_owner=NULL;	232	t->cpu->fpu_owner=NULL;
233	spinlock_unlock(&t->cpu->lock);	233	spinlock_unlock(&t->cpu->lock);
234		234
235	/*	235	/*
236	* Detach from the containing task.	236	* Detach from the containing task.
237	*/	237	*/
238	spinlock_lock(&t->task->lock);	238	spinlock_lock(&t->task->lock);
239	list_remove(&t->th_link);	239	list_remove(&t->th_link);
240	spinlock_unlock(&t->task->lock);	240	spinlock_unlock(&t->task->lock);
241		241
242	spinlock_unlock(&t->lock);	242	spinlock_unlock(&t->lock);
243		243
244	spinlock_lock(&threads_lock);	244	spinlock_lock(&threads_lock);
245	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);	245	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);
246	spinlock_unlock(&threads_lock);	246	spinlock_unlock(&threads_lock);
247		247
248	slab_free(thread_slab, t);	248	slab_free(thread_slab, t);
249	}	249	}
250		250
251	/** Create new thread	251	/** Create new thread
252	*	252	*
253	* Create a new thread.	253	* Create a new thread.
254	*	254	*
255	* @param func Thread's implementing function.	255	* @param func Thread's implementing function.
256	* @param arg Thread's implementing function argument.	256	* @param arg Thread's implementing function argument.
257	* @param task Task to which the thread belongs.	257	* @param task Task to which the thread belongs.
258	* @param flags Thread flags.	258	* @param flags Thread flags.
259	* @param name Symbolic name.	259	* @param name Symbolic name.
260	*	260	*
261	* @return New thread's structure on success, NULL on failure.	261	* @return New thread's structure on success, NULL on failure.
262	*	262	*
263	*/	263	*/
264	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)
265	{	265	{
266	thread_t *t;	266	thread_t *t;
267	ipl_t ipl;	267	ipl_t ipl;
268		268
269	t = (thread_t *) slab_alloc(thread_slab, 0);	269	t = (thread_t *) slab_alloc(thread_slab, 0);
270	if (!t)	270	if (!t)
271	return NULL;	271	return NULL;
272		272
273	thread_create_arch(t);	273	thread_create_arch(t);
274		274
275	/* Not needed, but good for debugging */	275	/* Not needed, but good for debugging */
276	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);	276	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);
277		277
278	ipl = interrupts_disable();	278	ipl = interrupts_disable();
279	spinlock_lock(&tidlock);	279	spinlock_lock(&tidlock);
280	t->tid = ++last_tid;	280	t->tid = ++last_tid;
281	spinlock_unlock(&tidlock);	281	spinlock_unlock(&tidlock);
282	interrupts_restore(ipl);	282	interrupts_restore(ipl);
283		283
284	context_save(&t->saved_context);	284	context_save(&t->saved_context);
285	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);
286		286
287	the_initialize((the_t *) t->kstack);	287	the_initialize((the_t *) t->kstack);
288		288
289	ipl = interrupts_disable();	289	ipl = interrupts_disable();
290	t->saved_context.ipl = interrupts_read();	290	t->saved_context.ipl = interrupts_read();
291	interrupts_restore(ipl);	291	interrupts_restore(ipl);
292		292
293	memcpy(t->name, name, THREAD_NAME_BUFLEN);	293	memcpy(t->name, name, THREAD_NAME_BUFLEN);
294		294
295	t->thread_code = func;	295	t->thread_code = func;
296	t->thread_arg = arg;	296	t->thread_arg = arg;
297	t->ticks = -1;	297	t->ticks = -1;
298	t->priority = -1; /* start in rq[0] */	298	t->priority = -1; /* start in rq[0] */
299	t->cpu = NULL;	299	t->cpu = NULL;
300	t->flags = 0;	300	t->flags = 0;
301	t->state = Entering;	301	t->state = Entering;
302	t->call_me = NULL;	302	t->call_me = NULL;
303	t->call_me_with = NULL;	303	t->call_me_with = NULL;
304		304
305	timeout_initialize(&t->sleep_timeout);	305	timeout_initialize(&t->sleep_timeout);
-		306	t->sleep_interruptible = false;
306	t->sleep_queue = NULL;	307	t->sleep_queue = NULL;
307	t->timeout_pending = 0;	308	t->timeout_pending = 0;
308		309
309	t->in_copy_from_uspace = false;	310	t->in_copy_from_uspace = false;
310	t->in_copy_to_uspace = false;	311	t->in_copy_to_uspace = false;
311		312
312	t->rwlock_holder_type = RWLOCK_NONE;	313	t->rwlock_holder_type = RWLOCK_NONE;
313		314
314	t->task = task;	315	t->task = task;
315		316
316	t->fpu_context_exists = 0;	317	t->fpu_context_exists = 0;
317	t->fpu_context_engaged = 0;	318	t->fpu_context_engaged = 0;
318		319
319	/*	320	/*
320	* Register this thread in the system-wide list.	321	* Register this thread in the system-wide list.
321	*/	322	*/
322	ipl = interrupts_disable();	323	ipl = interrupts_disable();
323	spinlock_lock(&threads_lock);	324	spinlock_lock(&threads_lock);
324	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);	325	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);
325	spinlock_unlock(&threads_lock);	326	spinlock_unlock(&threads_lock);
326		327
327	/*	328	/*
328	* Attach to the containing task.	329	* Attach to the containing task.
329	*/	330	*/
330	spinlock_lock(&task->lock);	331	spinlock_lock(&task->lock);
331	list_append(&t->th_link, &task->th_head);	332	list_append(&t->th_link, &task->th_head);
332	spinlock_unlock(&task->lock);	333	spinlock_unlock(&task->lock);
333		334
334	interrupts_restore(ipl);	335	interrupts_restore(ipl);
335		336
336	return t;	337	return t;
337	}	338	}
338		339
339	/** Make thread exiting	340	/** Make thread exiting
340	*	341	*
341	* End current thread execution and switch it to the exiting	342	* End current thread execution and switch it to the exiting
342	* state. All pending timeouts are executed.	343	* state. All pending timeouts are executed.
343	*	344	*
344	*/	345	*/
345	void thread_exit(void)	346	void thread_exit(void)
346	{	347	{
347	ipl_t ipl;	348	ipl_t ipl;
348		349
349	restart:	350	restart:
350	ipl = interrupts_disable();	351	ipl = interrupts_disable();
351	spinlock_lock(&THREAD->lock);	352	spinlock_lock(&THREAD->lock);
352	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	353	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
353	spinlock_unlock(&THREAD->lock);	354	spinlock_unlock(&THREAD->lock);
354	interrupts_restore(ipl);	355	interrupts_restore(ipl);
355	goto restart;	356	goto restart;
356	}	357	}
357	THREAD->state = Exiting;	358	THREAD->state = Exiting;
358	spinlock_unlock(&THREAD->lock);	359	spinlock_unlock(&THREAD->lock);
359	scheduler();	360	scheduler();
360	}	361	}
361		362
362		363
363	/** Thread sleep	364	/** Thread sleep
364	*	365	*
365	* Suspend execution of the current thread.	366	* Suspend execution of the current thread.
366	*	367	*
367	* @param sec Number of seconds to sleep.	368	* @param sec Number of seconds to sleep.
368	*	369	*
369	*/	370	*/
370	void thread_sleep(__u32 sec)	371	void thread_sleep(__u32 sec)
371	{	372	{
372	thread_usleep(sec*1000000);	373	thread_usleep(sec*1000000);
373	}	374	}
374		375
375	/** Thread usleep	376	/** Thread usleep
376	*	377	*
377	* Suspend execution of the current thread.	378	* Suspend execution of the current thread.
378	*	379	*
379	* @param usec Number of microseconds to sleep.	380	* @param usec Number of microseconds to sleep.
380	*	381	*
381	*/	382	*/
382	void thread_usleep(__u32 usec)	383	void thread_usleep(__u32 usec)
383	{	384	{
384	waitq_t wq;	385	waitq_t wq;
385		386
386	waitq_initialize(&wq);	387	waitq_initialize(&wq);
387		388
388	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	389	(void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING);
389	}	390	}
390		391
391	/** Register thread out-of-context invocation	392	/** Register thread out-of-context invocation
392	*	393	*
393	* Register a function and its argument to be executed	394	* Register a function and its argument to be executed
394	* on next context switch to the current thread.	395	* on next context switch to the current thread.
395	*	396	*
396	* @param call_me Out-of-context function.	397	* @param call_me Out-of-context function.
397	* @param call_me_with Out-of-context function argument.	398	* @param call_me_with Out-of-context function argument.
398	*	399	*
399	*/	400	*/
400	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	401	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
401	{	402	{
402	ipl_t ipl;	403	ipl_t ipl;
403		404
404	ipl = interrupts_disable();	405	ipl = interrupts_disable();
405	spinlock_lock(&THREAD->lock);	406	spinlock_lock(&THREAD->lock);
406	THREAD->call_me = call_me;	407	THREAD->call_me = call_me;
407	THREAD->call_me_with = call_me_with;	408	THREAD->call_me_with = call_me_with;
408	spinlock_unlock(&THREAD->lock);	409	spinlock_unlock(&THREAD->lock);
409	interrupts_restore(ipl);	410	interrupts_restore(ipl);
410	}	411	}
411		412
412	/** Print list of threads debug info */	413	/** Print list of threads debug info */
413	void thread_print_list(void)	414	void thread_print_list(void)
414	{	415	{
415	link_t *cur;	416	link_t *cur;
416	ipl_t ipl;	417	ipl_t ipl;
417		418
418	/* Messing with thread structures, avoid deadlock */	419	/* Messing with thread structures, avoid deadlock */
419	ipl = interrupts_disable();	420	ipl = interrupts_disable();
420	spinlock_lock(&threads_lock);	421	spinlock_lock(&threads_lock);
421		422
422	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {	423	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {
423	btree_node_t *node;	424	btree_node_t *node;
424	int i;	425	int i;
425		426
426	node = list_get_instance(cur, btree_node_t, leaf_link);	427	node = list_get_instance(cur, btree_node_t, leaf_link);
427	for (i = 0; i < node->keys; i++) {	428	for (i = 0; i < node->keys; i++) {
428	thread_t *t;	429	thread_t *t;
429		430
430	t = (thread_t *) node->value[i];	431	t = (thread_t *) node->value[i];
431	printf("%s: address=%#zX, tid=%zd, state=%s, task=%#zX, code=%#zX, stack=%#zX, cpu=",	432	printf("%s: address=%#zX, tid=%zd, state=%s, task=%#zX, code=%#zX, stack=%#zX, cpu=",
432	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);	433	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
433	if (t->cpu)	434	if (t->cpu)
434	printf("cpu%zd", t->cpu->id);	435	printf("cpu%zd", t->cpu->id);
435	else	436	else
436	printf("none");	437	printf("none");
437	if (t->state == Sleeping) {	438	if (t->state == Sleeping) {
438	printf(", kst=%#zX", t->kstack);	439	printf(", kst=%#zX", t->kstack);
439	printf(", wq=%#zX", t->sleep_queue);	440	printf(", wq=%#zX", t->sleep_queue);
440	}	441	}
441	printf("\n");	442	printf("\n");
442	}	443	}
443	}	444	}
444		445
445	spinlock_unlock(&threads_lock);	446	spinlock_unlock(&threads_lock);
446	interrupts_restore(ipl);	447	interrupts_restore(ipl);
447	}	448	}
448		449
449	/** Check whether thread exists.	450	/** Check whether thread exists.
450	*	451	*
451	* Note that threads_lock must be already held and	452	* Note that threads_lock must be already held and
452	* interrupts must be already disabled.	453	* interrupts must be already disabled.
453	*	454	*
454	* @param t Pointer to thread.	455	* @param t Pointer to thread.
455	*	456	*
456	* @return True if thread t is known to the system, false otherwise.	457	* @return True if thread t is known to the system, false otherwise.
457	*/	458	*/
458	bool thread_exists(thread_t *t)	459	bool thread_exists(thread_t *t)
459	{	460	{
460	btree_node_t *leaf;	461	btree_node_t *leaf;
461		462
462	return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;	463	return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;
463	}	464	}
464		465
465	/** Process syscall to create new thread.	466	/** Process syscall to create new thread.
466	*	467	*
467	*/	468	*/
468	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)	469	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)
469	{	470	{
470	thread_t *t;	471	thread_t *t;
471	char namebuf[THREAD_NAME_BUFLEN];	472	char namebuf[THREAD_NAME_BUFLEN];
472	uspace_arg_t *kernel_uarg;	473	uspace_arg_t *kernel_uarg;
473	__u32 tid;	474	__u32 tid;
474	int rc;	475	int rc;
475		476
476	rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);	477	rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
477	if (rc != 0)	478	if (rc != 0)
478	return (__native) rc;	479	return (__native) rc;
479		480
480	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	481	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
481	rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));	482	rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
482	if (rc != 0) {	483	if (rc != 0) {
483	free(kernel_uarg);	484	free(kernel_uarg);
484	return (__native) rc;	485	return (__native) rc;
485	}	486	}
486		487
487	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {	488	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
488	tid = t->tid;	489	tid = t->tid;
489	thread_ready(t);	490	thread_ready(t);
490	return (__native) tid;	491	return (__native) tid;
491	} else {	492	} else {
492	free(kernel_uarg);	493	free(kernel_uarg);
493	}	494	}
494		495
495	return (__native) ENOMEM;	496	return (__native) ENOMEM;
496	}	497	}
497		498
498	/** Process syscall to terminate thread.	499	/** Process syscall to terminate thread.
499	*	500	*

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/proc/thread.c – Rev 1458 → 1502