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 <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;
    pfn_t pfn;
 
    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);
   
    pfn = frame_alloc(ONE_FRAME, FRAME_KA | kmflags);
    t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
    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(ADDR2PFN(KA2PA(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);
 
 
 
 
    /*
     * 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;
 
 
    t = (thread_t *) slab_alloc(thread_slab, 0);
    if (t) {
        ipl_t ipl;
   
 
 
 
 
        /* 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);
       
 
 
        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 788	Rev 814
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>	-
33	#include <mm/frame.h>	32	#include <mm/frame.h>
34	#include <mm/page.h>	33	#include <mm/page.h>
35	#include <arch/asm.h>	34	#include <arch/asm.h>
36	#include <arch.h>	35	#include <arch.h>
37	#include <synch/synch.h>	36	#include <synch/synch.h>
38	#include <synch/spinlock.h>	37	#include <synch/spinlock.h>
39	#include <synch/waitq.h>	38	#include <synch/waitq.h>
40	#include <synch/rwlock.h>	39	#include <synch/rwlock.h>
41	#include <cpu.h>	40	#include <cpu.h>
42	#include <func.h>	41	#include <func.h>
43	#include <context.h>	42	#include <context.h>
44	#include <adt/list.h>	43	#include <adt/list.h>
45	#include <typedefs.h>	44	#include <typedefs.h>
46	#include <time/clock.h>	45	#include <time/clock.h>
47	#include <adt/list.h>	46	#include <adt/list.h>
48	#include <config.h>	47	#include <config.h>
49	#include <arch/interrupt.h>	48	#include <arch/interrupt.h>
50	#include <smp/ipi.h>	49	#include <smp/ipi.h>
51	#include <arch/faddr.h>	50	#include <arch/faddr.h>
52	#include <arch/atomic.h>	51	#include <arch/atomic.h>
53	#include <memstr.h>	52	#include <memstr.h>
54	#include <print.h>	53	#include <print.h>
55	#include <mm/slab.h>	54	#include <mm/slab.h>
56	#include <debug.h>	55	#include <debug.h>
57		56
58	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	57	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
59		58
60	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /	59	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /
61	LIST_INITIALIZE(threads_head); /*< List of all threads. /	60	LIST_INITIALIZE(threads_head); /*< List of all threads. /
62		61
63	SPINLOCK_INITIALIZE(tidlock);	62	SPINLOCK_INITIALIZE(tidlock);
64	__u32 last_tid = 0;	63	__u32 last_tid = 0;
65		64
66	static slab_cache_t *thread_slab;	65	static slab_cache_t *thread_slab;
67		66
68		67
69	/** Thread wrapper	68	/** Thread wrapper
70	*	69	*
71	* This wrapper is provided to ensure that every thread	70	* This wrapper is provided to ensure that every thread
72	* makes a call to thread_exit() when its implementing	71	* makes a call to thread_exit() when its implementing
73	* function returns.	72	* function returns.
74	*	73	*
75	* interrupts_disable() is assumed.	74	* interrupts_disable() is assumed.
76	*	75	*
77	*/	76	*/
78	static void cushion(void)	77	static void cushion(void)
79	{	78	{
80	void (f)(void ) = THREAD->thread_code;	79	void (f)(void ) = THREAD->thread_code;
81	void *arg = THREAD->thread_arg;	80	void *arg = THREAD->thread_arg;
82		81
83	/* this is where each thread wakes up after its creation */	82	/* this is where each thread wakes up after its creation */
84	before_thread_runs();	83	before_thread_runs();
85		84
86	spinlock_unlock(&THREAD->lock);	85	spinlock_unlock(&THREAD->lock);
87	interrupts_enable();	86	interrupts_enable();
88		87
89	f(arg);	88	f(arg);
90	thread_exit();	89	thread_exit();
91	/* not reached */	90	/* not reached */
92	}	91	}
93		92
94	/** Initialization and allocation for thread_t structure */	93	/** Initialization and allocation for thread_t structure */
95	static int thr_constructor(void *obj, int kmflags)	94	static int thr_constructor(void *obj, int kmflags)
96	{	95	{
97	thread_t t = (thread_t )obj;	96	thread_t t = (thread_t )obj;
-		97	pfn_t pfn;
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	pfn = frame_alloc(ONE_FRAME, FRAME_KA \| kmflags);
-		106	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
106	if (!t->kstack)	107	if (!t->kstack)
107	return -1;	108	return -1;
108		109
109	return 0;	110	return 0;
110	}	111	}
111		112
112	/** Destruction of thread_t object */	113	/** Destruction of thread_t object */
113	static int thr_destructor(void *obj)	114	static int thr_destructor(void *obj)
114	{	115	{
115	thread_t t = (thread_t )obj;	116	thread_t t = (thread_t )obj;
116		117
117	frame_free((__address) t->kstack);	118	frame_free(ADDR2PFN(KA2PA(t->kstack)));
118	return 1; /* One page freed */	119	return 1; /* One page freed */
119	}	120	}
120		121
121	/** Initialize threads	122	/** Initialize threads
122	*	123	*
123	* Initialize kernel threads support.	124	* Initialize kernel threads support.
124	*	125	*
125	*/	126	*/
126	void thread_init(void)	127	void thread_init(void)
127	{	128	{
128	THREAD = NULL;	129	THREAD = NULL;
129	atomic_set(&nrdy,0);	130	atomic_set(&nrdy,0);
130	thread_slab = slab_cache_create("thread_slab",	131	thread_slab = slab_cache_create("thread_slab",
131	sizeof(thread_t),0,	132	sizeof(thread_t),0,
132	thr_constructor, thr_destructor, 0);	133	thr_constructor, thr_destructor, 0);
133	}	134	}
134		135
135		136
136	/** Make thread ready	137	/** Make thread ready
137	*	138	*
138	* Switch thread t to the ready state.	139	* Switch thread t to the ready state.
139	*	140	*
140	* @param t Thread to make ready.	141	* @param t Thread to make ready.
141	*	142	*
142	*/	143	*/
143	void thread_ready(thread_t *t)	144	void thread_ready(thread_t *t)
144	{	145	{
145	cpu_t *cpu;	146	cpu_t *cpu;
146	runq_t *r;	147	runq_t *r;
147	ipl_t ipl;	148	ipl_t ipl;
148	int i, avg;	149	int i, avg;
149		150
150	ipl = interrupts_disable();	151	ipl = interrupts_disable();
151		152
152	spinlock_lock(&t->lock);	153	spinlock_lock(&t->lock);
153		154
154	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	155	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
155		156
156	cpu = CPU;	157	cpu = CPU;
157	if (t->flags & X_WIRED) {	158	if (t->flags & X_WIRED) {
158	cpu = t->cpu;	159	cpu = t->cpu;
159	}	160	}
160	spinlock_unlock(&t->lock);	161	spinlock_unlock(&t->lock);
161		162
162	/*	163	/*
163	* Append t to respective ready queue on respective processor.	164	* Append t to respective ready queue on respective processor.
164	*/	165	*/
165	r = &cpu->rq[i];	166	r = &cpu->rq[i];
166	spinlock_lock(&r->lock);	167	spinlock_lock(&r->lock);
167	list_append(&t->rq_link, &r->rq_head);	168	list_append(&t->rq_link, &r->rq_head);
168	r->n++;	169	r->n++;
169	spinlock_unlock(&r->lock);	170	spinlock_unlock(&r->lock);
170		171
171	atomic_inc(&nrdy);	172	atomic_inc(&nrdy);
172	avg = atomic_get(&nrdy) / config.cpu_active;	173	avg = atomic_get(&nrdy) / config.cpu_active;
173	atomic_inc(&cpu->nrdy);	174	atomic_inc(&cpu->nrdy);
174		175
175	interrupts_restore(ipl);	176	interrupts_restore(ipl);
176	}	177	}
177		178
178		179
179	/** Destroy thread memory structure	180	/** Destroy thread memory structure
180	*	181	*
181	* Detach thread from all queues, cpus etc. and destroy it.	182	* Detach thread from all queues, cpus etc. and destroy it.
182	*	183	*
183	* Assume thread->lock is held!!	184	* Assume thread->lock is held!!
184	*/	185	*/
185	void thread_destroy(thread_t *t)	186	void thread_destroy(thread_t *t)
186	{	187	{
187	ASSERT(t->state == Exiting);	188	ASSERT(t->state == Exiting);
188	ASSERT(t->task);	189	ASSERT(t->task);
189	ASSERT(t->cpu);	190	ASSERT(t->cpu);
190		191
191	spinlock_lock(&t->cpu->lock);	192	spinlock_lock(&t->cpu->lock);
192	if(t->cpu->fpu_owner==t)	193	if(t->cpu->fpu_owner==t)
193	t->cpu->fpu_owner=NULL;	194	t->cpu->fpu_owner=NULL;
194	spinlock_unlock(&t->cpu->lock);	195	spinlock_unlock(&t->cpu->lock);
195		196
196	if (t->ustack)	-
197	frame_free((__address) t->ustack);	-
198		-
199	/*	197	/*
200	* Detach from the containing task.	198	* Detach from the containing task.
201	*/	199	*/
202	spinlock_lock(&t->task->lock);	200	spinlock_lock(&t->task->lock);
203	list_remove(&t->th_link);	201	list_remove(&t->th_link);
204	spinlock_unlock(&t->task->lock);	202	spinlock_unlock(&t->task->lock);
205		203
206	spinlock_unlock(&t->lock);	204	spinlock_unlock(&t->lock);
207		205
208	spinlock_lock(&threads_lock);	206	spinlock_lock(&threads_lock);
209	list_remove(&t->threads_link);	207	list_remove(&t->threads_link);
210	spinlock_unlock(&threads_lock);	208	spinlock_unlock(&threads_lock);
211		209
212	slab_free(thread_slab, t);	210	slab_free(thread_slab, t);
213	}	211	}
214		212
215		213
216	/** Create new thread	214	/** Create new thread
217	*	215	*
218	* Create a new thread.	216	* Create a new thread.
219	*	217	*
220	* @param func Thread's implementing function.	218	* @param func Thread's implementing function.
221	* @param arg Thread's implementing function argument.	219	* @param arg Thread's implementing function argument.
222	* @param task Task to which the thread belongs.	220	* @param task Task to which the thread belongs.
223	* @param flags Thread flags.	221	* @param flags Thread flags.
224	*	222	*
225	* @return New thread's structure on success, NULL on failure.	223	* @return New thread's structure on success, NULL on failure.
226	*	224	*
227	*/	225	*/
228	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)	226	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)
229	{	227	{
230	thread_t *t;	228	thread_t *t;
231	__address frame_us = NULL;	-
232		229
233	t = (thread_t *) slab_alloc(thread_slab, 0);	230	t = (thread_t *) slab_alloc(thread_slab, 0);
234	if (t) {	231	if (t) {
235	ipl_t ipl;	232	ipl_t ipl;
236		233
237	if (THREAD_USER_STACK & flags) {	-
238	frame_us = frame_alloc(ONE_FRAME, FRAME_KA);	-
239	}	-
240		-
241	/* Not needed, but good for debugging */	234	/* Not needed, but good for debugging */
242	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	235	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
243		236
244	ipl = interrupts_disable();	237	ipl = interrupts_disable();
245	spinlock_lock(&tidlock);	238	spinlock_lock(&tidlock);
246	t->tid = ++last_tid;	239	t->tid = ++last_tid;
247	spinlock_unlock(&tidlock);	240	spinlock_unlock(&tidlock);
248	interrupts_restore(ipl);	241	interrupts_restore(ipl);
249		242
250	t->ustack = (__u8 *) frame_us;	-
251		-
252	context_save(&t->saved_context);	243	context_save(&t->saved_context);
253	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	244	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
254		245
255	the_initialize((the_t *) t->kstack);	246	the_initialize((the_t *) t->kstack);
256		247
257	ipl = interrupts_disable();	248	ipl = interrupts_disable();
258	t->saved_context.ipl = interrupts_read();	249	t->saved_context.ipl = interrupts_read();
259	interrupts_restore(ipl);	250	interrupts_restore(ipl);
260		251
261	t->thread_code = func;	252	t->thread_code = func;
262	t->thread_arg = arg;	253	t->thread_arg = arg;
263	t->ticks = -1;	254	t->ticks = -1;
264	t->priority = -1; /* start in rq[0] */	255	t->priority = -1; /* start in rq[0] */
265	t->cpu = NULL;	256	t->cpu = NULL;
266	t->flags = 0;	257	t->flags = 0;
267	t->state = Entering;	258	t->state = Entering;
268	t->call_me = NULL;	259	t->call_me = NULL;
269	t->call_me_with = NULL;	260	t->call_me_with = NULL;
270		261
271	timeout_initialize(&t->sleep_timeout);	262	timeout_initialize(&t->sleep_timeout);
272	t->sleep_queue = NULL;	263	t->sleep_queue = NULL;
273	t->timeout_pending = 0;	264	t->timeout_pending = 0;
274		265
275	t->rwlock_holder_type = RWLOCK_NONE;	266	t->rwlock_holder_type = RWLOCK_NONE;
276		267
277	t->task = task;	268	t->task = task;
278		269
279	t->fpu_context_exists=0;	270	t->fpu_context_exists=0;
280	t->fpu_context_engaged=0;	271	t->fpu_context_engaged=0;
281		272
282	/*	273	/*
283	* Register this thread in the system-wide list.	274	* Register this thread in the system-wide list.
284	*/	275	*/
285	ipl = interrupts_disable();	276	ipl = interrupts_disable();
286	spinlock_lock(&threads_lock);	277	spinlock_lock(&threads_lock);
287	list_append(&t->threads_link, &threads_head);	278	list_append(&t->threads_link, &threads_head);
288	spinlock_unlock(&threads_lock);	279	spinlock_unlock(&threads_lock);
289		280
290	/*	281	/*
291	* Attach to the containing task.	282	* Attach to the containing task.
292	*/	283	*/
293	spinlock_lock(&task->lock);	284	spinlock_lock(&task->lock);
294	list_append(&t->th_link, &task->th_head);	285	list_append(&t->th_link, &task->th_head);
295	spinlock_unlock(&task->lock);	286	spinlock_unlock(&task->lock);
296		287
297	interrupts_restore(ipl);	288	interrupts_restore(ipl);
298	}	289	}
299		290
300	return t;	291	return t;
301	}	292	}
302		293
303		294
304	/** Make thread exiting	295	/** Make thread exiting
305	*	296	*
306	* End current thread execution and switch it to the exiting	297	* End current thread execution and switch it to the exiting
307	* state. All pending timeouts are executed.	298	* state. All pending timeouts are executed.
308	*	299	*
309	*/	300	*/
310	void thread_exit(void)	301	void thread_exit(void)
311	{	302	{
312	ipl_t ipl;	303	ipl_t ipl;
313		304
314	restart:	305	restart:
315	ipl = interrupts_disable();	306	ipl = interrupts_disable();
316	spinlock_lock(&THREAD->lock);	307	spinlock_lock(&THREAD->lock);
317	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	308	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
318	spinlock_unlock(&THREAD->lock);	309	spinlock_unlock(&THREAD->lock);
319	interrupts_restore(ipl);	310	interrupts_restore(ipl);
320	goto restart;	311	goto restart;
321	}	312	}
322	THREAD->state = Exiting;	313	THREAD->state = Exiting;
323	spinlock_unlock(&THREAD->lock);	314	spinlock_unlock(&THREAD->lock);
324	scheduler();	315	scheduler();
325	}	316	}
326		317
327		318
328	/** Thread sleep	319	/** Thread sleep
329	*	320	*
330	* Suspend execution of the current thread.	321	* Suspend execution of the current thread.
331	*	322	*
332	* @param sec Number of seconds to sleep.	323	* @param sec Number of seconds to sleep.
333	*	324	*
334	*/	325	*/
335	void thread_sleep(__u32 sec)	326	void thread_sleep(__u32 sec)
336	{	327	{
337	thread_usleep(sec*1000000);	328	thread_usleep(sec*1000000);
338	}	329	}
339		330
340		331
341	/** Thread usleep	332	/** Thread usleep
342	*	333	*
343	* Suspend execution of the current thread.	334	* Suspend execution of the current thread.
344	*	335	*
345	* @param usec Number of microseconds to sleep.	336	* @param usec Number of microseconds to sleep.
346	*	337	*
347	*/	338	*/
348	void thread_usleep(__u32 usec)	339	void thread_usleep(__u32 usec)
349	{	340	{
350	waitq_t wq;	341	waitq_t wq;
351		342
352	waitq_initialize(&wq);	343	waitq_initialize(&wq);
353		344
354	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	345	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
355	}	346	}
356		347
357		348
358	/** Register thread out-of-context invocation	349	/** Register thread out-of-context invocation
359	*	350	*
360	* Register a function and its argument to be executed	351	* Register a function and its argument to be executed
361	* on next context switch to the current thread.	352	* on next context switch to the current thread.
362	*	353	*
363	* @param call_me Out-of-context function.	354	* @param call_me Out-of-context function.
364	* @param call_me_with Out-of-context function argument.	355	* @param call_me_with Out-of-context function argument.
365	*	356	*
366	*/	357	*/
367	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	358	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
368	{	359	{
369	ipl_t ipl;	360	ipl_t ipl;
370		361
371	ipl = interrupts_disable();	362	ipl = interrupts_disable();
372	spinlock_lock(&THREAD->lock);	363	spinlock_lock(&THREAD->lock);
373	THREAD->call_me = call_me;	364	THREAD->call_me = call_me;
374	THREAD->call_me_with = call_me_with;	365	THREAD->call_me_with = call_me_with;
375	spinlock_unlock(&THREAD->lock);	366	spinlock_unlock(&THREAD->lock);
376	interrupts_restore(ipl);	367	interrupts_restore(ipl);
377	}	368	}
378		369
379	/** Print list of threads debug info */	370	/** Print list of threads debug info */
380	void thread_print_list(void)	371	void thread_print_list(void)
381	{	372	{
382	link_t *cur;	373	link_t *cur;
383	thread_t *t;	374	thread_t *t;
384	ipl_t ipl;	375	ipl_t ipl;
385		376
386	/* Messing with thread structures, avoid deadlock */	377	/* Messing with thread structures, avoid deadlock */
387	ipl = interrupts_disable();	378	ipl = interrupts_disable();
388	spinlock_lock(&threads_lock);	379	spinlock_lock(&threads_lock);
389		380
390	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	381	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
391	t = list_get_instance(cur, thread_t, threads_link);	382	t = list_get_instance(cur, thread_t, threads_link);
392	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);	383	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
393	if (t->cpu)	384	if (t->cpu)
394	printf("cpu%d ", t->cpu->id);	385	printf("cpu%d ", t->cpu->id);
395		386
396	printf("\n");	387	printf("\n");
397	}	388	}
398		389
399	spinlock_unlock(&threads_lock);	390	spinlock_unlock(&threads_lock);
400	interrupts_enable();	391	interrupts_enable();
401	}	392	}
402		393

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(root)/kernel/trunk/generic/src/proc/thread.c – Rev 788 → 814