WebSVN – HelenOS – Diff – /branches/sparc/kernel/generic/src/proc/thread.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <proc/scheduler.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <mm/heap.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/list.h>
#include <typedefs.h>
#include <time/clock.h>
#include <adt/list.h>
#include <config.h>
#include <arch/interrupt.h>
#include <smp/ipi.h>
#include <arch/faddr.h>
#include <arch/atomic.h>
#include <memstr.h>
#include <print.h>
#include <mm/slab.h>
#include <debug.h>
 
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
 
SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
LIST_INITIALIZE(threads_head);      /**< List of all threads. */
 
SPINLOCK_INITIALIZE(tidlock);
__u32 last_tid = 0;
 
static slab_cache_t *thread_slab;
 
 
/** 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 */
    before_thread_runs();
 
    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;
 
    spinlock_initialize(&t->lock, "thread_t_lock");
    link_initialize(&t->rq_link);
    link_initialize(&t->wq_link);
    link_initialize(&t->th_link);
    link_initialize(&t->threads_link);
   
    t->kstack = (__u8 *)frame_alloc(ONE_FRAME, FRAME_KA | kmflags);
    if (!t->kstack)
        return -1;
 
    return 0;
}
 
/** Destruction of thread_t object */
static int thr_destructor(void *obj)
{
    thread_t *t = (thread_t *)obj;
 
    frame_free((__address) t->kstack);
    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);
}
 
 
/** 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);
 
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
   
    cpu = CPU;
    if (t->flags & X_WIRED) {
        cpu = t->cpu;
    }
    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);
 
    if (t->ustack)
        frame_free((__address) t->ustack);
   
    /*
     * 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);
    list_remove(&t->threads_link);
    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.
 *
 * @return New thread's structure on success, NULL on failure.
 *
 */
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
{
    thread_t *t;
    __address frame_us = NULL;
 
    t = (thread_t *) slab_alloc(thread_slab, 0);
    if (t) {
        ipl_t ipl;
   
        if (THREAD_USER_STACK & flags) {
            frame_us = frame_alloc(ONE_FRAME, FRAME_KA);
        }
 
        /* Not needed, but good for debugging */
        memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
 
        ipl = interrupts_disable();
        spinlock_lock(&tidlock);
        t->tid = ++last_tid;
        spinlock_unlock(&tidlock);
        interrupts_restore(ipl);
       
        t->ustack = (__u8 *) frame_us;
       
        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);
       
        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);
        list_append(&t->threads_link, &threads_head);
        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;
    thread_t *t;
    ipl_t ipl;
   
    /* Messing with thread structures, avoid deadlock */
    ipl = interrupts_disable();
    spinlock_lock(&threads_lock);
 
    for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
        t = list_get_instance(cur, thread_t, threads_link);
        printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
        if (t->cpu)
            printf("cpu%d ", t->cpu->id);
       
        printf("\n");
    }
 
    spinlock_unlock(&threads_lock);
    interrupts_enable();
}
 

Rev 787	Rev 788
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 <mm/heap.h>	32	#include <mm/heap.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 <list.h>	44	#include <adt/list.h>
45	#include <typedefs.h>	45	#include <typedefs.h>
46	#include <time/clock.h>	46	#include <time/clock.h>
47	#include <list.h>	47	#include <adt/list.h>
48	#include <config.h>	48	#include <config.h>
49	#include <arch/interrupt.h>	49	#include <arch/interrupt.h>
50	#include <smp/ipi.h>	50	#include <smp/ipi.h>
51	#include <arch/faddr.h>	51	#include <arch/faddr.h>
52	#include <arch/atomic.h>	52	#include <arch/atomic.h>
53	#include <memstr.h>	53	#include <memstr.h>
54	#include <print.h>	54	#include <print.h>
55	#include <mm/slab.h>	55	#include <mm/slab.h>
56	#include <debug.h>	56	#include <debug.h>
57		57
58	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	58	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
59		59
60	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /	60	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /
61	LIST_INITIALIZE(threads_head); /*< List of all threads. /	61	LIST_INITIALIZE(threads_head); /*< List of all threads. /
62		62
63	SPINLOCK_INITIALIZE(tidlock);	63	SPINLOCK_INITIALIZE(tidlock);
64	__u32 last_tid = 0;	64	__u32 last_tid = 0;
65		65
66	static slab_cache_t *thread_slab;	66	static slab_cache_t *thread_slab;
67		67
68		68
69	/** Thread wrapper	69	/** Thread wrapper
70	*	70	*
71	* This wrapper is provided to ensure that every thread	71	* This wrapper is provided to ensure that every thread
72	* makes a call to thread_exit() when its implementing	72	* makes a call to thread_exit() when its implementing
73	* function returns.	73	* function returns.
74	*	74	*
75	* interrupts_disable() is assumed.	75	* interrupts_disable() is assumed.
76	*	76	*
77	*/	77	*/
78	static void cushion(void)	78	static void cushion(void)
79	{	79	{
80	void (f)(void ) = THREAD->thread_code;	80	void (f)(void ) = THREAD->thread_code;
81	void *arg = THREAD->thread_arg;	81	void *arg = THREAD->thread_arg;
82		82
83	/* this is where each thread wakes up after its creation */	83	/* this is where each thread wakes up after its creation */
84	before_thread_runs();	84	before_thread_runs();
85		85
86	spinlock_unlock(&THREAD->lock);	86	spinlock_unlock(&THREAD->lock);
87	interrupts_enable();	87	interrupts_enable();
88		88
89	f(arg);	89	f(arg);
90	thread_exit();	90	thread_exit();
91	/* not reached */	91	/* not reached */
92	}	92	}
93		93
94	/** Initialization and allocation for thread_t structure */	94	/** Initialization and allocation for thread_t structure */
95	static int thr_constructor(void *obj, int kmflags)	95	static int thr_constructor(void *obj, int kmflags)
96	{	96	{
97	thread_t t = (thread_t )obj;	97	thread_t t = (thread_t )obj;
98		98
99	spinlock_initialize(&t->lock, "thread_t_lock");	99	spinlock_initialize(&t->lock, "thread_t_lock");
100	link_initialize(&t->rq_link);	100	link_initialize(&t->rq_link);
101	link_initialize(&t->wq_link);	101	link_initialize(&t->wq_link);
102	link_initialize(&t->th_link);	102	link_initialize(&t->th_link);
103	link_initialize(&t->threads_link);	103	link_initialize(&t->threads_link);
104		104
105	t->kstack = (__u8 *)frame_alloc(ONE_FRAME, FRAME_KA \| kmflags);	105	t->kstack = (__u8 *)frame_alloc(ONE_FRAME, FRAME_KA \| kmflags);
106	if (!t->kstack)	106	if (!t->kstack)
107	return -1;	107	return -1;
108		108
109	return 0;	109	return 0;
110	}	110	}
111		111
112	/** Destruction of thread_t object */	112	/** Destruction of thread_t object */
113	static int thr_destructor(void *obj)	113	static int thr_destructor(void *obj)
114	{	114	{
115	thread_t t = (thread_t )obj;	115	thread_t t = (thread_t )obj;
116		116
117	frame_free((__address) t->kstack);	117	frame_free((__address) t->kstack);
118	return 1; /* One page freed */	118	return 1; /* One page freed */
119	}	119	}
120		120
121	/** Initialize threads	121	/** Initialize threads
122	*	122	*
123	* Initialize kernel threads support.	123	* Initialize kernel threads support.
124	*	124	*
125	*/	125	*/
126	void thread_init(void)	126	void thread_init(void)
127	{	127	{
128	THREAD = NULL;	128	THREAD = NULL;
129	atomic_set(&nrdy,0);	129	atomic_set(&nrdy,0);
130	thread_slab = slab_cache_create("thread_slab",	130	thread_slab = slab_cache_create("thread_slab",
131	sizeof(thread_t),0,	131	sizeof(thread_t),0,
132	thr_constructor, thr_destructor, 0);	132	thr_constructor, thr_destructor, 0);
133	}	133	}
134		134
135		135
136	/** Make thread ready	136	/** Make thread ready
137	*	137	*
138	* Switch thread t to the ready state.	138	* Switch thread t to the ready state.
139	*	139	*
140	* @param t Thread to make ready.	140	* @param t Thread to make ready.
141	*	141	*
142	*/	142	*/
143	void thread_ready(thread_t *t)	143	void thread_ready(thread_t *t)
144	{	144	{
145	cpu_t *cpu;	145	cpu_t *cpu;
146	runq_t *r;	146	runq_t *r;
147	ipl_t ipl;	147	ipl_t ipl;
148	int i, avg;	148	int i, avg;
149		149
150	ipl = interrupts_disable();	150	ipl = interrupts_disable();
151		151
152	spinlock_lock(&t->lock);	152	spinlock_lock(&t->lock);
153		153
154	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	154	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
155		155
156	cpu = CPU;	156	cpu = CPU;
157	if (t->flags & X_WIRED) {	157	if (t->flags & X_WIRED) {
158	cpu = t->cpu;	158	cpu = t->cpu;
159	}	159	}
160	spinlock_unlock(&t->lock);	160	spinlock_unlock(&t->lock);
161		161
162	/*	162	/*
163	* Append t to respective ready queue on respective processor.	163	* Append t to respective ready queue on respective processor.
164	*/	164	*/
165	r = &cpu->rq[i];	165	r = &cpu->rq[i];
166	spinlock_lock(&r->lock);	166	spinlock_lock(&r->lock);
167	list_append(&t->rq_link, &r->rq_head);	167	list_append(&t->rq_link, &r->rq_head);
168	r->n++;	168	r->n++;
169	spinlock_unlock(&r->lock);	169	spinlock_unlock(&r->lock);
170		170
171	atomic_inc(&nrdy);	171	atomic_inc(&nrdy);
172	avg = atomic_get(&nrdy) / config.cpu_active;	172	avg = atomic_get(&nrdy) / config.cpu_active;
173	atomic_inc(&cpu->nrdy);	173	atomic_inc(&cpu->nrdy);
174		174
175	interrupts_restore(ipl);	175	interrupts_restore(ipl);
176	}	176	}
177		177
178		178
179	/** Destroy thread memory structure	179	/** Destroy thread memory structure
180	*	180	*
181	* Detach thread from all queues, cpus etc. and destroy it.	181	* Detach thread from all queues, cpus etc. and destroy it.
182	*	182	*
183	* Assume thread->lock is held!!	183	* Assume thread->lock is held!!
184	*/	184	*/
185	void thread_destroy(thread_t *t)	185	void thread_destroy(thread_t *t)
186	{	186	{
187	ASSERT(t->state == Exiting);	187	ASSERT(t->state == Exiting);
188	ASSERT(t->task);	188	ASSERT(t->task);
189	ASSERT(t->cpu);	189	ASSERT(t->cpu);
190		190
191	spinlock_lock(&t->cpu->lock);	191	spinlock_lock(&t->cpu->lock);
192	if(t->cpu->fpu_owner==t)	192	if(t->cpu->fpu_owner==t)
193	t->cpu->fpu_owner=NULL;	193	t->cpu->fpu_owner=NULL;
194	spinlock_unlock(&t->cpu->lock);	194	spinlock_unlock(&t->cpu->lock);
195		195
196	if (t->ustack)	196	if (t->ustack)
197	frame_free((__address) t->ustack);	197	frame_free((__address) t->ustack);
198		198
199	/*	199	/*
200	* Detach from the containing task.	200	* Detach from the containing task.
201	*/	201	*/
202	spinlock_lock(&t->task->lock);	202	spinlock_lock(&t->task->lock);
203	list_remove(&t->th_link);	203	list_remove(&t->th_link);
204	spinlock_unlock(&t->task->lock);	204	spinlock_unlock(&t->task->lock);
205		205
206	spinlock_unlock(&t->lock);	206	spinlock_unlock(&t->lock);
207		207
208	spinlock_lock(&threads_lock);	208	spinlock_lock(&threads_lock);
209	list_remove(&t->threads_link);	209	list_remove(&t->threads_link);
210	spinlock_unlock(&threads_lock);	210	spinlock_unlock(&threads_lock);
211		211
212	slab_free(thread_slab, t);	212	slab_free(thread_slab, t);
213	}	213	}
214		214
215		215
216	/** Create new thread	216	/** Create new thread
217	*	217	*
218	* Create a new thread.	218	* Create a new thread.
219	*	219	*
220	* @param func Thread's implementing function.	220	* @param func Thread's implementing function.
221	* @param arg Thread's implementing function argument.	221	* @param arg Thread's implementing function argument.
222	* @param task Task to which the thread belongs.	222	* @param task Task to which the thread belongs.
223	* @param flags Thread flags.	223	* @param flags Thread flags.
224	*	224	*
225	* @return New thread's structure on success, NULL on failure.	225	* @return New thread's structure on success, NULL on failure.
226	*	226	*
227	*/	227	*/
228	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)	228	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)
229	{	229	{
230	thread_t *t;	230	thread_t *t;
231	__address frame_us = NULL;	231	__address frame_us = NULL;
232		232
233	t = (thread_t *) slab_alloc(thread_slab, 0);	233	t = (thread_t *) slab_alloc(thread_slab, 0);
234	if (t) {	234	if (t) {
235	ipl_t ipl;	235	ipl_t ipl;
236		236
237	if (THREAD_USER_STACK & flags) {	237	if (THREAD_USER_STACK & flags) {
238	frame_us = frame_alloc(ONE_FRAME, FRAME_KA);	238	frame_us = frame_alloc(ONE_FRAME, FRAME_KA);
239	}	239	}
240		240
241	/* Not needed, but good for debugging */	241	/* Not needed, but good for debugging */
242	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	242	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
243		243
244	ipl = interrupts_disable();	244	ipl = interrupts_disable();
245	spinlock_lock(&tidlock);	245	spinlock_lock(&tidlock);
246	t->tid = ++last_tid;	246	t->tid = ++last_tid;
247	spinlock_unlock(&tidlock);	247	spinlock_unlock(&tidlock);
248	interrupts_restore(ipl);	248	interrupts_restore(ipl);
249		249
250	t->ustack = (__u8 *) frame_us;	250	t->ustack = (__u8 *) frame_us;
251		251
252	context_save(&t->saved_context);	252	context_save(&t->saved_context);
253	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	253	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
254		254
255	the_initialize((the_t *) t->kstack);	255	the_initialize((the_t *) t->kstack);
256		256
257	ipl = interrupts_disable();	257	ipl = interrupts_disable();
258	t->saved_context.ipl = interrupts_read();	258	t->saved_context.ipl = interrupts_read();
259	interrupts_restore(ipl);	259	interrupts_restore(ipl);
260		260
261	t->thread_code = func;	261	t->thread_code = func;
262	t->thread_arg = arg;	262	t->thread_arg = arg;
263	t->ticks = -1;	263	t->ticks = -1;
264	t->priority = -1; /* start in rq[0] */	264	t->priority = -1; /* start in rq[0] */
265	t->cpu = NULL;	265	t->cpu = NULL;
266	t->flags = 0;	266	t->flags = 0;
267	t->state = Entering;	267	t->state = Entering;
268	t->call_me = NULL;	268	t->call_me = NULL;
269	t->call_me_with = NULL;	269	t->call_me_with = NULL;
270		270
271	timeout_initialize(&t->sleep_timeout);	271	timeout_initialize(&t->sleep_timeout);
272	t->sleep_queue = NULL;	272	t->sleep_queue = NULL;
273	t->timeout_pending = 0;	273	t->timeout_pending = 0;
274		274
275	t->rwlock_holder_type = RWLOCK_NONE;	275	t->rwlock_holder_type = RWLOCK_NONE;
276		276
277	t->task = task;	277	t->task = task;
278		278
279	t->fpu_context_exists=0;	279	t->fpu_context_exists=0;
280	t->fpu_context_engaged=0;	280	t->fpu_context_engaged=0;
281		281
282	/*	282	/*
283	* Register this thread in the system-wide list.	283	* Register this thread in the system-wide list.
284	*/	284	*/
285	ipl = interrupts_disable();	285	ipl = interrupts_disable();
286	spinlock_lock(&threads_lock);	286	spinlock_lock(&threads_lock);
287	list_append(&t->threads_link, &threads_head);	287	list_append(&t->threads_link, &threads_head);
288	spinlock_unlock(&threads_lock);	288	spinlock_unlock(&threads_lock);
289		289
290	/*	290	/*
291	* Attach to the containing task.	291	* Attach to the containing task.
292	*/	292	*/
293	spinlock_lock(&task->lock);	293	spinlock_lock(&task->lock);
294	list_append(&t->th_link, &task->th_head);	294	list_append(&t->th_link, &task->th_head);
295	spinlock_unlock(&task->lock);	295	spinlock_unlock(&task->lock);
296		296
297	interrupts_restore(ipl);	297	interrupts_restore(ipl);
298	}	298	}
299		299
300	return t;	300	return t;
301	}	301	}
302		302
303		303
304	/** Make thread exiting	304	/** Make thread exiting
305	*	305	*
306	* End current thread execution and switch it to the exiting	306	* End current thread execution and switch it to the exiting
307	* state. All pending timeouts are executed.	307	* state. All pending timeouts are executed.
308	*	308	*
309	*/	309	*/
310	void thread_exit(void)	310	void thread_exit(void)
311	{	311	{
312	ipl_t ipl;	312	ipl_t ipl;
313		313
314	restart:	314	restart:
315	ipl = interrupts_disable();	315	ipl = interrupts_disable();
316	spinlock_lock(&THREAD->lock);	316	spinlock_lock(&THREAD->lock);
317	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	317	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
318	spinlock_unlock(&THREAD->lock);	318	spinlock_unlock(&THREAD->lock);
319	interrupts_restore(ipl);	319	interrupts_restore(ipl);
320	goto restart;	320	goto restart;
321	}	321	}
322	THREAD->state = Exiting;	322	THREAD->state = Exiting;
323	spinlock_unlock(&THREAD->lock);	323	spinlock_unlock(&THREAD->lock);
324	scheduler();	324	scheduler();
325	}	325	}
326		326
327		327
328	/** Thread sleep	328	/** Thread sleep
329	*	329	*
330	* Suspend execution of the current thread.	330	* Suspend execution of the current thread.
331	*	331	*
332	* @param sec Number of seconds to sleep.	332	* @param sec Number of seconds to sleep.
333	*	333	*
334	*/	334	*/
335	void thread_sleep(__u32 sec)	335	void thread_sleep(__u32 sec)
336	{	336	{
337	thread_usleep(sec*1000000);	337	thread_usleep(sec*1000000);
338	}	338	}
339		339
340		340
341	/** Thread usleep	341	/** Thread usleep
342	*	342	*
343	* Suspend execution of the current thread.	343	* Suspend execution of the current thread.
344	*	344	*
345	* @param usec Number of microseconds to sleep.	345	* @param usec Number of microseconds to sleep.
346	*	346	*
347	*/	347	*/
348	void thread_usleep(__u32 usec)	348	void thread_usleep(__u32 usec)
349	{	349	{
350	waitq_t wq;	350	waitq_t wq;
351		351
352	waitq_initialize(&wq);	352	waitq_initialize(&wq);
353		353
354	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	354	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
355	}	355	}
356		356
357		357
358	/** Register thread out-of-context invocation	358	/** Register thread out-of-context invocation
359	*	359	*
360	* Register a function and its argument to be executed	360	* Register a function and its argument to be executed
361	* on next context switch to the current thread.	361	* on next context switch to the current thread.
362	*	362	*
363	* @param call_me Out-of-context function.	363	* @param call_me Out-of-context function.
364	* @param call_me_with Out-of-context function argument.	364	* @param call_me_with Out-of-context function argument.
365	*	365	*
366	*/	366	*/
367	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	367	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
368	{	368	{
369	ipl_t ipl;	369	ipl_t ipl;
370		370
371	ipl = interrupts_disable();	371	ipl = interrupts_disable();
372	spinlock_lock(&THREAD->lock);	372	spinlock_lock(&THREAD->lock);
373	THREAD->call_me = call_me;	373	THREAD->call_me = call_me;
374	THREAD->call_me_with = call_me_with;	374	THREAD->call_me_with = call_me_with;
375	spinlock_unlock(&THREAD->lock);	375	spinlock_unlock(&THREAD->lock);
376	interrupts_restore(ipl);	376	interrupts_restore(ipl);
377	}	377	}
378		378
379	/** Print list of threads debug info */	379	/** Print list of threads debug info */
380	void thread_print_list(void)	380	void thread_print_list(void)
381	{	381	{
382	link_t *cur;	382	link_t *cur;
383	thread_t *t;	383	thread_t *t;
384	ipl_t ipl;	384	ipl_t ipl;
385		385
386	/* Messing with thread structures, avoid deadlock */	386	/* Messing with thread structures, avoid deadlock */
387	ipl = interrupts_disable();	387	ipl = interrupts_disable();
388	spinlock_lock(&threads_lock);	388	spinlock_lock(&threads_lock);
389		389
390	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	390	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
391	t = list_get_instance(cur, thread_t, threads_link);	391	t = list_get_instance(cur, thread_t, threads_link);
392	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);	392	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
393	if (t->cpu)	393	if (t->cpu)
394	printf("cpu%d ", t->cpu->id);	394	printf("cpu%d ", t->cpu->id);
395		395
396	printf("\n");	396	printf("\n");
397	}	397	}
398		398
399	spinlock_unlock(&threads_lock);	399	spinlock_unlock(&threads_lock);
400	interrupts_enable();	400	interrupts_enable();
401	}	401	}
402		402

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(root)/branches/sparc/kernel/generic/src/proc/thread.c @ 4688 – Rev 787 → 788