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.
 */
 
#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=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
                t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
            if (t->cpu)
                printf("cpu%d ", t->cpu->id);
            else
                printf("none");
            printf("\n");
        }
    }
 
    spinlock_unlock(&threads_lock);
    interrupts_restore(ipl);
}
 
/** Check whether thread exists.
 *
 * Note that threads_lock must be already held and
 * interrupts must be already disabled.
 *
 * @param t Pointer to thread.
 *
 * @return True if thread t is known to the system, false otherwise.
 */
bool thread_exists(thread_t *t)
{
    btree_node_t *leaf;
   
    return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;
}
 
/** Process syscall to create new thread.
 *
 */
__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name)
{
        thread_t *t;
        char namebuf[THREAD_NAME_BUFLEN];
    uspace_arg_t *kernel_uarg;
    __u32 tid;
 
        copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
 
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
    copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
 
        if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
        tid = t->tid;
                thread_ready(t);
        return (__native) tid;
        } else {
        free(kernel_uarg);
        }
 
        return (__native) -1;
}
 
/** Process syscall to terminate thread.
 *
 */
__native sys_thread_exit(int uspace_status)
{
        thread_exit();
        /* Unreachable */
        return 0;
}
 

Rev 1177	Rev 1184
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	#include <proc/scheduler.h>	29	#include <proc/scheduler.h>
30	#include <proc/thread.h>	30	#include <proc/thread.h>
31	#include <proc/task.h>	31	#include <proc/task.h>
32	#include <proc/uarg.h>	32	#include <proc/uarg.h>
33	#include <mm/frame.h>	33	#include <mm/frame.h>
34	#include <mm/page.h>	34	#include <mm/page.h>
35	#include <arch/asm.h>	35	#include <arch/asm.h>
36	#include <arch.h>	36	#include <arch.h>
37	#include <synch/synch.h>	37	#include <synch/synch.h>
38	#include <synch/spinlock.h>	38	#include <synch/spinlock.h>
39	#include <synch/waitq.h>	39	#include <synch/waitq.h>
40	#include <synch/rwlock.h>	40	#include <synch/rwlock.h>
41	#include <cpu.h>	41	#include <cpu.h>
42	#include <func.h>	42	#include <func.h>
43	#include <context.h>	43	#include <context.h>
44	#include <adt/btree.h>	44	#include <adt/btree.h>
45	#include <adt/list.h>	45	#include <adt/list.h>
46	#include <typedefs.h>	46	#include <typedefs.h>
47	#include <time/clock.h>	47	#include <time/clock.h>
48	#include <adt/list.h>	-
49	#include <config.h>	48	#include <config.h>
50	#include <arch/interrupt.h>	49	#include <arch/interrupt.h>
51	#include <smp/ipi.h>	50	#include <smp/ipi.h>
52	#include <arch/faddr.h>	51	#include <arch/faddr.h>
53	#include <atomic.h>	52	#include <atomic.h>
54	#include <memstr.h>	53	#include <memstr.h>
55	#include <print.h>	54	#include <print.h>
56	#include <mm/slab.h>	55	#include <mm/slab.h>
57	#include <debug.h>	56	#include <debug.h>
58	#include <main/uinit.h>	57	#include <main/uinit.h>
59		58
60	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	59	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
61		60
62	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */	61	/** Lock protecting threads_head list. For locking rules, see declaration thereof. */
63	SPINLOCK_INITIALIZE(threads_lock);	62	SPINLOCK_INITIALIZE(threads_lock);
64	btree_t threads_btree; /*< B+tree of all threads. /	63	btree_t threads_btree; /*< B+tree of all threads. /
65		64
66	SPINLOCK_INITIALIZE(tidlock);	65	SPINLOCK_INITIALIZE(tidlock);
67	__u32 last_tid = 0;	66	__u32 last_tid = 0;
68		67
69	static slab_cache_t *thread_slab;	68	static slab_cache_t *thread_slab;
70	#ifdef ARCH_HAS_FPU	69	#ifdef ARCH_HAS_FPU
71	slab_cache_t *fpu_context_slab;	70	slab_cache_t *fpu_context_slab;
72	#endif	71	#endif
73		72
74	/** Thread wrapper	73	/** Thread wrapper
75	*	74	*
76	* This wrapper is provided to ensure that every thread	75	* This wrapper is provided to ensure that every thread
77	* makes a call to thread_exit() when its implementing	76	* makes a call to thread_exit() when its implementing
78	* function returns.	77	* function returns.
79	*	78	*
80	* interrupts_disable() is assumed.	79	* interrupts_disable() is assumed.
81	*	80	*
82	*/	81	*/
83	static void cushion(void)	82	static void cushion(void)
84	{	83	{
85	void (f)(void ) = THREAD->thread_code;	84	void (f)(void ) = THREAD->thread_code;
86	void *arg = THREAD->thread_arg;	85	void *arg = THREAD->thread_arg;
87		86
88	/* this is where each thread wakes up after its creation */	87	/* this is where each thread wakes up after its creation */
89	spinlock_unlock(&THREAD->lock);	88	spinlock_unlock(&THREAD->lock);
90	interrupts_enable();	89	interrupts_enable();
91		90
92	f(arg);	91	f(arg);
93	thread_exit();	92	thread_exit();
94	/* not reached */	93	/* not reached */
95	}	94	}
96		95
97	/** Initialization and allocation for thread_t structure */	96	/** Initialization and allocation for thread_t structure */
98	static int thr_constructor(void *obj, int kmflags)	97	static int thr_constructor(void *obj, int kmflags)
99	{	98	{
100	thread_t t = (thread_t )obj;	99	thread_t t = (thread_t )obj;
101	pfn_t pfn;	100	pfn_t pfn;
102	int status;	101	int status;
103		102
104	spinlock_initialize(&t->lock, "thread_t_lock");	103	spinlock_initialize(&t->lock, "thread_t_lock");
105	link_initialize(&t->rq_link);	104	link_initialize(&t->rq_link);
106	link_initialize(&t->wq_link);	105	link_initialize(&t->wq_link);
107	link_initialize(&t->th_link);	106	link_initialize(&t->th_link);
108		107
109	#ifdef ARCH_HAS_FPU	108	#ifdef ARCH_HAS_FPU
110	# ifdef CONFIG_FPU_LAZY	109	# ifdef CONFIG_FPU_LAZY
111	t->saved_fpu_context = NULL;	110	t->saved_fpu_context = NULL;
112	# else	111	# else
113	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	112	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
114	if (!t->saved_fpu_context)	113	if (!t->saved_fpu_context)
115	return -1;	114	return -1;
116	# endif	115	# endif
117	#endif	116	#endif
118		117
119	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	118	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
120	if (status) {	119	if (status) {
121	#ifdef ARCH_HAS_FPU	120	#ifdef ARCH_HAS_FPU
122	if (t->saved_fpu_context)	121	if (t->saved_fpu_context)
123	slab_free(fpu_context_slab,t->saved_fpu_context);	122	slab_free(fpu_context_slab,t->saved_fpu_context);
124	#endif	123	#endif
125	return -1;	124	return -1;
126	}	125	}
127	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	126	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
128		127
129	return 0;	128	return 0;
130	}	129	}
131		130
132	/** Destruction of thread_t object */	131	/** Destruction of thread_t object */
133	static int thr_destructor(void *obj)	132	static int thr_destructor(void *obj)
134	{	133	{
135	thread_t t = (thread_t )obj;	134	thread_t t = (thread_t )obj;
136		135
137	frame_free(ADDR2PFN(KA2PA(t->kstack)));	136	frame_free(ADDR2PFN(KA2PA(t->kstack)));
138	#ifdef ARCH_HAS_FPU	137	#ifdef ARCH_HAS_FPU
139	if (t->saved_fpu_context)	138	if (t->saved_fpu_context)
140	slab_free(fpu_context_slab,t->saved_fpu_context);	139	slab_free(fpu_context_slab,t->saved_fpu_context);
141	#endif	140	#endif
142	return 1; /* One page freed */	141	return 1; /* One page freed */
143	}	142	}
144		143
145	/** Initialize threads	144	/** Initialize threads
146	*	145	*
147	* Initialize kernel threads support.	146	* Initialize kernel threads support.
148	*	147	*
149	*/	148	*/
150	void thread_init(void)	149	void thread_init(void)
151	{	150	{
152	THREAD = NULL;	151	THREAD = NULL;
153	atomic_set(&nrdy,0);	152	atomic_set(&nrdy,0);
154	thread_slab = slab_cache_create("thread_slab",	153	thread_slab = slab_cache_create("thread_slab",
155	sizeof(thread_t),0,	154	sizeof(thread_t),0,
156	thr_constructor, thr_destructor, 0);	155	thr_constructor, thr_destructor, 0);
157	#ifdef ARCH_HAS_FPU	156	#ifdef ARCH_HAS_FPU
158	fpu_context_slab = slab_cache_create("fpu_slab",	157	fpu_context_slab = slab_cache_create("fpu_slab",
159	sizeof(fpu_context_t),	158	sizeof(fpu_context_t),
160	FPU_CONTEXT_ALIGN,	159	FPU_CONTEXT_ALIGN,
161	NULL, NULL, 0);	160	NULL, NULL, 0);
162	#endif	161	#endif
163		162
164	btree_create(&threads_btree);	163	btree_create(&threads_btree);
165	}	164	}
166		165
167	/** Make thread ready	166	/** Make thread ready
168	*	167	*
169	* Switch thread t to the ready state.	168	* Switch thread t to the ready state.
170	*	169	*
171	* @param t Thread to make ready.	170	* @param t Thread to make ready.
172	*	171	*
173	*/	172	*/
174	void thread_ready(thread_t *t)	173	void thread_ready(thread_t *t)
175	{	174	{
176	cpu_t *cpu;	175	cpu_t *cpu;
177	runq_t *r;	176	runq_t *r;
178	ipl_t ipl;	177	ipl_t ipl;
179	int i, avg;	178	int i, avg;
180		179
181	ipl = interrupts_disable();	180	ipl = interrupts_disable();
182		181
183	spinlock_lock(&t->lock);	182	spinlock_lock(&t->lock);
184		183
185	ASSERT(! (t->state == Ready));	184	ASSERT(! (t->state == Ready));
186		185
187	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	186	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
188		187
189	cpu = CPU;	188	cpu = CPU;
190	if (t->flags & X_WIRED) {	189	if (t->flags & X_WIRED) {
191	cpu = t->cpu;	190	cpu = t->cpu;
192	}	191	}
193	t->state = Ready;	192	t->state = Ready;
194	spinlock_unlock(&t->lock);	193	spinlock_unlock(&t->lock);
195		194
196	/*	195	/*
197	* Append t to respective ready queue on respective processor.	196	* Append t to respective ready queue on respective processor.
198	*/	197	*/
199	r = &cpu->rq[i];	198	r = &cpu->rq[i];
200	spinlock_lock(&r->lock);	199	spinlock_lock(&r->lock);
201	list_append(&t->rq_link, &r->rq_head);	200	list_append(&t->rq_link, &r->rq_head);
202	r->n++;	201	r->n++;
203	spinlock_unlock(&r->lock);	202	spinlock_unlock(&r->lock);
204		203
205	atomic_inc(&nrdy);	204	atomic_inc(&nrdy);
206	avg = atomic_get(&nrdy) / config.cpu_active;	205	avg = atomic_get(&nrdy) / config.cpu_active;
207	atomic_inc(&cpu->nrdy);	206	atomic_inc(&cpu->nrdy);
208		207
209	interrupts_restore(ipl);	208	interrupts_restore(ipl);
210	}	209	}
211		210
212	/** Destroy thread memory structure	211	/** Destroy thread memory structure
213	*	212	*
214	* Detach thread from all queues, cpus etc. and destroy it.	213	* Detach thread from all queues, cpus etc. and destroy it.
215	*	214	*
216	* Assume thread->lock is held!!	215	* Assume thread->lock is held!!
217	*/	216	*/
218	void thread_destroy(thread_t *t)	217	void thread_destroy(thread_t *t)
219	{	218	{
220	ASSERT(t->state == Exiting);	219	ASSERT(t->state == Exiting);
221	ASSERT(t->task);	220	ASSERT(t->task);
222	ASSERT(t->cpu);	221	ASSERT(t->cpu);
223		222
224	spinlock_lock(&t->cpu->lock);	223	spinlock_lock(&t->cpu->lock);
225	if(t->cpu->fpu_owner==t)	224	if(t->cpu->fpu_owner==t)
226	t->cpu->fpu_owner=NULL;	225	t->cpu->fpu_owner=NULL;
227	spinlock_unlock(&t->cpu->lock);	226	spinlock_unlock(&t->cpu->lock);
228		227
229	/*	228	/*
230	* Detach from the containing task.	229	* Detach from the containing task.
231	*/	230	*/
232	spinlock_lock(&t->task->lock);	231	spinlock_lock(&t->task->lock);
233	list_remove(&t->th_link);	232	list_remove(&t->th_link);
234	spinlock_unlock(&t->task->lock);	233	spinlock_unlock(&t->task->lock);
235		234
236	spinlock_unlock(&t->lock);	235	spinlock_unlock(&t->lock);
237		236
238	spinlock_lock(&threads_lock);	237	spinlock_lock(&threads_lock);
239	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);	238	btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);
240	spinlock_unlock(&threads_lock);	239	spinlock_unlock(&threads_lock);
241		240
242	slab_free(thread_slab, t);	241	slab_free(thread_slab, t);
243	}	242	}
244		243
245	/** Create new thread	244	/** Create new thread
246	*	245	*
247	* Create a new thread.	246	* Create a new thread.
248	*	247	*
249	* @param func Thread's implementing function.	248	* @param func Thread's implementing function.
250	* @param arg Thread's implementing function argument.	249	* @param arg Thread's implementing function argument.
251	* @param task Task to which the thread belongs.	250	* @param task Task to which the thread belongs.
252	* @param flags Thread flags.	251	* @param flags Thread flags.
253	* @param name Symbolic name.	252	* @param name Symbolic name.
254	*	253	*
255	* @return New thread's structure on success, NULL on failure.	254	* @return New thread's structure on success, NULL on failure.
256	*	255	*
257	*/	256	*/
258	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)	257	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)
259	{	258	{
260	thread_t *t;	259	thread_t *t;
261	ipl_t ipl;	260	ipl_t ipl;
262		261
263	t = (thread_t *) slab_alloc(thread_slab, 0);	262	t = (thread_t *) slab_alloc(thread_slab, 0);
264	if (!t)	263	if (!t)
265	return NULL;	264	return NULL;
266		265
267	thread_create_arch(t);	266	thread_create_arch(t);
268		267
269	/* Not needed, but good for debugging */	268	/* Not needed, but good for debugging */
270	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);	269	memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);
271		270
272	ipl = interrupts_disable();	271	ipl = interrupts_disable();
273	spinlock_lock(&tidlock);	272	spinlock_lock(&tidlock);
274	t->tid = ++last_tid;	273	t->tid = ++last_tid;
275	spinlock_unlock(&tidlock);	274	spinlock_unlock(&tidlock);
276	interrupts_restore(ipl);	275	interrupts_restore(ipl);
277		276
278	context_save(&t->saved_context);	277	context_save(&t->saved_context);
279	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	278	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
280		279
281	the_initialize((the_t *) t->kstack);	280	the_initialize((the_t *) t->kstack);
282		281
283	ipl = interrupts_disable();	282	ipl = interrupts_disable();
284	t->saved_context.ipl = interrupts_read();	283	t->saved_context.ipl = interrupts_read();
285	interrupts_restore(ipl);	284	interrupts_restore(ipl);
286		285
287	memcpy(t->name, name, THREAD_NAME_BUFLEN);	286	memcpy(t->name, name, THREAD_NAME_BUFLEN);
288		287
289	t->thread_code = func;	288	t->thread_code = func;
290	t->thread_arg = arg;	289	t->thread_arg = arg;
291	t->ticks = -1;	290	t->ticks = -1;
292	t->priority = -1; /* start in rq[0] */	291	t->priority = -1; /* start in rq[0] */
293	t->cpu = NULL;	292	t->cpu = NULL;
294	t->flags = 0;	293	t->flags = 0;
295	t->state = Entering;	294	t->state = Entering;
296	t->call_me = NULL;	295	t->call_me = NULL;
297	t->call_me_with = NULL;	296	t->call_me_with = NULL;
298		297
299	timeout_initialize(&t->sleep_timeout);	298	timeout_initialize(&t->sleep_timeout);
300	t->sleep_queue = NULL;	299	t->sleep_queue = NULL;
301	t->timeout_pending = 0;	300	t->timeout_pending = 0;
302		301
303	t->rwlock_holder_type = RWLOCK_NONE;	302	t->rwlock_holder_type = RWLOCK_NONE;
304		303
305	t->task = task;	304	t->task = task;
306		305
307	t->fpu_context_exists = 0;	306	t->fpu_context_exists = 0;
308	t->fpu_context_engaged = 0;	307	t->fpu_context_engaged = 0;
309		308
310	/*	309	/*
311	* Register this thread in the system-wide list.	310	* Register this thread in the system-wide list.
312	*/	311	*/
313	ipl = interrupts_disable();	312	ipl = interrupts_disable();
314	spinlock_lock(&threads_lock);	313	spinlock_lock(&threads_lock);
315	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);	314	btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);
316	spinlock_unlock(&threads_lock);	315	spinlock_unlock(&threads_lock);
317		316
318	/*	317	/*
319	* Attach to the containing task.	318	* Attach to the containing task.
320	*/	319	*/
321	spinlock_lock(&task->lock);	320	spinlock_lock(&task->lock);
322	list_append(&t->th_link, &task->th_head);	321	list_append(&t->th_link, &task->th_head);
323	spinlock_unlock(&task->lock);	322	spinlock_unlock(&task->lock);
324		323
325	interrupts_restore(ipl);	324	interrupts_restore(ipl);
326		325
327	return t;	326	return t;
328	}	327	}
329		328
330	/** Make thread exiting	329	/** Make thread exiting
331	*	330	*
332	* End current thread execution and switch it to the exiting	331	* End current thread execution and switch it to the exiting
333	* state. All pending timeouts are executed.	332	* state. All pending timeouts are executed.
334	*	333	*
335	*/	334	*/
336	void thread_exit(void)	335	void thread_exit(void)
337	{	336	{
338	ipl_t ipl;	337	ipl_t ipl;
339		338
340	restart:	339	restart:
341	ipl = interrupts_disable();	340	ipl = interrupts_disable();
342	spinlock_lock(&THREAD->lock);	341	spinlock_lock(&THREAD->lock);
343	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	342	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
344	spinlock_unlock(&THREAD->lock);	343	spinlock_unlock(&THREAD->lock);
345	interrupts_restore(ipl);	344	interrupts_restore(ipl);
346	goto restart;	345	goto restart;
347	}	346	}
348	THREAD->state = Exiting;	347	THREAD->state = Exiting;
349	spinlock_unlock(&THREAD->lock);	348	spinlock_unlock(&THREAD->lock);
350	scheduler();	349	scheduler();
351	}	350	}
352		351
353		352
354	/** Thread sleep	353	/** Thread sleep
355	*	354	*
356	* Suspend execution of the current thread.	355	* Suspend execution of the current thread.
357	*	356	*
358	* @param sec Number of seconds to sleep.	357	* @param sec Number of seconds to sleep.
359	*	358	*
360	*/	359	*/
361	void thread_sleep(__u32 sec)	360	void thread_sleep(__u32 sec)
362	{	361	{
363	thread_usleep(sec*1000000);	362	thread_usleep(sec*1000000);
364	}	363	}
365		364
366	/** Thread usleep	365	/** Thread usleep
367	*	366	*
368	* Suspend execution of the current thread.	367	* Suspend execution of the current thread.
369	*	368	*
370	* @param usec Number of microseconds to sleep.	369	* @param usec Number of microseconds to sleep.
371	*	370	*
372	*/	371	*/
373	void thread_usleep(__u32 usec)	372	void thread_usleep(__u32 usec)
374	{	373	{
375	waitq_t wq;	374	waitq_t wq;
376		375
377	waitq_initialize(&wq);	376	waitq_initialize(&wq);
378		377
379	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	378	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
380	}	379	}
381		380
382	/** Register thread out-of-context invocation	381	/** Register thread out-of-context invocation
383	*	382	*
384	* Register a function and its argument to be executed	383	* Register a function and its argument to be executed
385	* on next context switch to the current thread.	384	* on next context switch to the current thread.
386	*	385	*
387	* @param call_me Out-of-context function.	386	* @param call_me Out-of-context function.
388	* @param call_me_with Out-of-context function argument.	387	* @param call_me_with Out-of-context function argument.
389	*	388	*
390	*/	389	*/
391	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	390	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
392	{	391	{
393	ipl_t ipl;	392	ipl_t ipl;
394		393
395	ipl = interrupts_disable();	394	ipl = interrupts_disable();
396	spinlock_lock(&THREAD->lock);	395	spinlock_lock(&THREAD->lock);
397	THREAD->call_me = call_me;	396	THREAD->call_me = call_me;
398	THREAD->call_me_with = call_me_with;	397	THREAD->call_me_with = call_me_with;
399	spinlock_unlock(&THREAD->lock);	398	spinlock_unlock(&THREAD->lock);
400	interrupts_restore(ipl);	399	interrupts_restore(ipl);
401	}	400	}
402		401
403	/** Print list of threads debug info */	402	/** Print list of threads debug info */
404	void thread_print_list(void)	403	void thread_print_list(void)
405	{	404	{
406	link_t *cur;	405	link_t *cur;
407	ipl_t ipl;	406	ipl_t ipl;
408		407
409	/* Messing with thread structures, avoid deadlock */	408	/* Messing with thread structures, avoid deadlock */
410	ipl = interrupts_disable();	409	ipl = interrupts_disable();
411	spinlock_lock(&threads_lock);	410	spinlock_lock(&threads_lock);
412		411
413	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {	412	for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {
414	btree_node_t *node;	413	btree_node_t *node;
415	int i;	414	int i;
416		415
417	node = list_get_instance(cur, btree_node_t, leaf_link);	416	node = list_get_instance(cur, btree_node_t, leaf_link);
418	for (i = 0; i < node->keys; i++) {	417	for (i = 0; i < node->keys; i++) {
419	thread_t *t;	418	thread_t *t;
420		419
421	t = (thread_t *) node->value[i];	420	t = (thread_t *) node->value[i];
422	printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",	421	printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
423	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);	422	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
424	if (t->cpu)	423	if (t->cpu)
425	printf("cpu%d ", t->cpu->id);	424	printf("cpu%d ", t->cpu->id);
426	else	425	else
427	printf("none");	426	printf("none");
428	printf("\n");	427	printf("\n");
429	}	428	}
430	}	429	}
431		430
432	spinlock_unlock(&threads_lock);	431	spinlock_unlock(&threads_lock);
433	interrupts_restore(ipl);	432	interrupts_restore(ipl);
434	}	433	}
435		434
436	/** Check whether thread exists.	435	/** Check whether thread exists.
437	*	436	*
438	* Note that threads_lock must be already held and	437	* Note that threads_lock must be already held and
439	* interrupts must be already disabled.	438	* interrupts must be already disabled.
440	*	439	*
441	* @param t Pointer to thread.	440	* @param t Pointer to thread.
442	*	441	*
443	* @return True if thread t is known to the system, false otherwise.	442	* @return True if thread t is known to the system, false otherwise.
444	*/	443	*/
445	bool thread_exists(thread_t *t)	444	bool thread_exists(thread_t *t)
446	{	445	{
447	btree_node_t *leaf;	446	btree_node_t *leaf;
448		447
449	return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;	448	return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;
450	}	449	}
451		450
452	/** Process syscall to create new thread.	451	/** Process syscall to create new thread.
453	*	452	*
454	*/	453	*/
455	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)	454	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)
456	{	455	{
457	thread_t *t;	456	thread_t *t;
458	char namebuf[THREAD_NAME_BUFLEN];	457	char namebuf[THREAD_NAME_BUFLEN];
459	uspace_arg_t *kernel_uarg;	458	uspace_arg_t *kernel_uarg;
460	__u32 tid;	459	__u32 tid;
461		460
462	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);	461	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
463		462
464	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	463	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
465	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));	464	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
466		465
467	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {	466	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
468	tid = t->tid;	467	tid = t->tid;
469	thread_ready(t);	468	thread_ready(t);
470	return (__native) tid;	469	return (__native) tid;
471	} else {	470	} else {
472	free(kernel_uarg);	471	free(kernel_uarg);
473	}	472	}
474		473
475	return (__native) -1;	474	return (__native) -1;
476	}	475	}
477		476
478	/** Process syscall to terminate thread.	477	/** Process syscall to terminate thread.
479	*	478	*
480	*/	479	*/
481	__native sys_thread_exit(int uspace_status)	480	__native sys_thread_exit(int uspace_status)
482	{	481	{
483	thread_exit();	482	thread_exit();
484	/* Unreachable */	483	/* Unreachable */
485	return 0;	484	return 0;
486	}	485	}
487		486

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/proc/thread.c – Rev 1177 → 1184