WebSVN – HelenOS – Diff – /trunk/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/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;
    int status;
 
    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_rc(ONE_FRAME, FRAME_KA | kmflags,&status);
 
    if (status)
        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)));
    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;
    ipl_t ipl;
   
    t = (thread_t *) slab_alloc(thread_slab, 0);
    if (!t)
        return NULL;
   
    /* 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 822	Rev 842
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/frame.h>	32	#include <mm/frame.h>
33	#include <mm/page.h>	33	#include <mm/page.h>
34	#include <arch/asm.h>	34	#include <arch/asm.h>
35	#include <arch.h>	35	#include <arch.h>
36	#include <synch/synch.h>	36	#include <synch/synch.h>
37	#include <synch/spinlock.h>	37	#include <synch/spinlock.h>
38	#include <synch/waitq.h>	38	#include <synch/waitq.h>
39	#include <synch/rwlock.h>	39	#include <synch/rwlock.h>
40	#include <cpu.h>	40	#include <cpu.h>
41	#include <func.h>	41	#include <func.h>
42	#include <context.h>	42	#include <context.h>
43	#include <adt/list.h>	43	#include <adt/list.h>
44	#include <typedefs.h>	44	#include <typedefs.h>
45	#include <time/clock.h>	45	#include <time/clock.h>
46	#include <adt/list.h>	46	#include <adt/list.h>
47	#include <config.h>	47	#include <config.h>
48	#include <arch/interrupt.h>	48	#include <arch/interrupt.h>
49	#include <smp/ipi.h>	49	#include <smp/ipi.h>
50	#include <arch/faddr.h>	50	#include <arch/faddr.h>
51	#include <arch/atomic.h>	51	#include <arch/atomic.h>
52	#include <memstr.h>	52	#include <memstr.h>
53	#include <print.h>	53	#include <print.h>
54	#include <mm/slab.h>	54	#include <mm/slab.h>
55	#include <debug.h>	55	#include <debug.h>
56		56
57	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	57	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
58		58
59	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. /
60	LIST_INITIALIZE(threads_head); /*< List of all threads. /	60	LIST_INITIALIZE(threads_head); /*< List of all threads. /
61		61
62	SPINLOCK_INITIALIZE(tidlock);	62	SPINLOCK_INITIALIZE(tidlock);
63	__u32 last_tid = 0;	63	__u32 last_tid = 0;
64		64
65	static slab_cache_t *thread_slab;	65	static slab_cache_t *thread_slab;
66		66
67		67
68	/** Thread wrapper	68	/** Thread wrapper
69	*	69	*
70	* This wrapper is provided to ensure that every thread	70	* This wrapper is provided to ensure that every thread
71	* makes a call to thread_exit() when its implementing	71	* makes a call to thread_exit() when its implementing
72	* function returns.	72	* function returns.
73	*	73	*
74	* interrupts_disable() is assumed.	74	* interrupts_disable() is assumed.
75	*	75	*
76	*/	76	*/
77	static void cushion(void)	77	static void cushion(void)
78	{	78	{
79	void (f)(void ) = THREAD->thread_code;	79	void (f)(void ) = THREAD->thread_code;
80	void *arg = THREAD->thread_arg;	80	void *arg = THREAD->thread_arg;
81		81
82	/* this is where each thread wakes up after its creation */	82	/* this is where each thread wakes up after its creation */
83	before_thread_runs();	83	before_thread_runs();
84		84
85	spinlock_unlock(&THREAD->lock);	85	spinlock_unlock(&THREAD->lock);
86	interrupts_enable();	86	interrupts_enable();
87		87
88	f(arg);	88	f(arg);
89	thread_exit();	89	thread_exit();
90	/* not reached */	90	/* not reached */
91	}	91	}
92		92
93	/** Initialization and allocation for thread_t structure */	93	/** Initialization and allocation for thread_t structure */
94	static int thr_constructor(void *obj, int kmflags)	94	static int thr_constructor(void *obj, int kmflags)
95	{	95	{
96	thread_t t = (thread_t )obj;	96	thread_t t = (thread_t )obj;
97	pfn_t pfn;	97	pfn_t pfn;
-		98	int status;
98		99
99	spinlock_initialize(&t->lock, "thread_t_lock");	100	spinlock_initialize(&t->lock, "thread_t_lock");
100	link_initialize(&t->rq_link);	101	link_initialize(&t->rq_link);
101	link_initialize(&t->wq_link);	102	link_initialize(&t->wq_link);
102	link_initialize(&t->th_link);	103	link_initialize(&t->th_link);
103	link_initialize(&t->threads_link);	104	link_initialize(&t->threads_link);
104		105
105	pfn = frame_alloc(ONE_FRAME, FRAME_KA \| kmflags);	106	pfn = frame_alloc_rc(ONE_FRAME, FRAME_KA \| kmflags,&status);
106	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	-
107	if (!t->kstack)	107	if (status)
108	return -1;	108	return -1;
-		109	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
109		110
110	return 0;	111	return 0;
111	}	112	}
112		113
113	/** Destruction of thread_t object */	114	/** Destruction of thread_t object */
114	static int thr_destructor(void *obj)	115	static int thr_destructor(void *obj)
115	{	116	{
116	thread_t t = (thread_t )obj;	117	thread_t t = (thread_t )obj;
117		118
118	frame_free(ADDR2PFN(KA2PA(t->kstack)));	119	frame_free(ADDR2PFN(KA2PA(t->kstack)));
119	return 1; /* One page freed */	120	return 1; /* One page freed */
120	}	121	}
121		122
122	/** Initialize threads	123	/** Initialize threads
123	*	124	*
124	* Initialize kernel threads support.	125	* Initialize kernel threads support.
125	*	126	*
126	*/	127	*/
127	void thread_init(void)	128	void thread_init(void)
128	{	129	{
129	THREAD = NULL;	130	THREAD = NULL;
130	atomic_set(&nrdy,0);	131	atomic_set(&nrdy,0);
131	thread_slab = slab_cache_create("thread_slab",	132	thread_slab = slab_cache_create("thread_slab",
132	sizeof(thread_t),0,	133	sizeof(thread_t),0,
133	thr_constructor, thr_destructor, 0);	134	thr_constructor, thr_destructor, 0);
134	}	135	}
135		136
136		137
137	/** Make thread ready	138	/** Make thread ready
138	*	139	*
139	* Switch thread t to the ready state.	140	* Switch thread t to the ready state.
140	*	141	*
141	* @param t Thread to make ready.	142	* @param t Thread to make ready.
142	*	143	*
143	*/	144	*/
144	void thread_ready(thread_t *t)	145	void thread_ready(thread_t *t)
145	{	146	{
146	cpu_t *cpu;	147	cpu_t *cpu;
147	runq_t *r;	148	runq_t *r;
148	ipl_t ipl;	149	ipl_t ipl;
149	int i, avg;	150	int i, avg;
150		151
151	ipl = interrupts_disable();	152	ipl = interrupts_disable();
152		153
153	spinlock_lock(&t->lock);	154	spinlock_lock(&t->lock);
154		155
155	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	156	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
156		157
157	cpu = CPU;	158	cpu = CPU;
158	if (t->flags & X_WIRED) {	159	if (t->flags & X_WIRED) {
159	cpu = t->cpu;	160	cpu = t->cpu;
160	}	161	}
161	spinlock_unlock(&t->lock);	162	spinlock_unlock(&t->lock);
162		163
163	/*	164	/*
164	* Append t to respective ready queue on respective processor.	165	* Append t to respective ready queue on respective processor.
165	*/	166	*/
166	r = &cpu->rq[i];	167	r = &cpu->rq[i];
167	spinlock_lock(&r->lock);	168	spinlock_lock(&r->lock);
168	list_append(&t->rq_link, &r->rq_head);	169	list_append(&t->rq_link, &r->rq_head);
169	r->n++;	170	r->n++;
170	spinlock_unlock(&r->lock);	171	spinlock_unlock(&r->lock);
171		172
172	atomic_inc(&nrdy);	173	atomic_inc(&nrdy);
173	avg = atomic_get(&nrdy) / config.cpu_active;	174	avg = atomic_get(&nrdy) / config.cpu_active;
174	atomic_inc(&cpu->nrdy);	175	atomic_inc(&cpu->nrdy);
175		176
176	interrupts_restore(ipl);	177	interrupts_restore(ipl);
177	}	178	}
178		179
179		180
180	/** Destroy thread memory structure	181	/** Destroy thread memory structure
181	*	182	*
182	* Detach thread from all queues, cpus etc. and destroy it.	183	* Detach thread from all queues, cpus etc. and destroy it.
183	*	184	*
184	* Assume thread->lock is held!!	185	* Assume thread->lock is held!!
185	*/	186	*/
186	void thread_destroy(thread_t *t)	187	void thread_destroy(thread_t *t)
187	{	188	{
188	ASSERT(t->state == Exiting);	189	ASSERT(t->state == Exiting);
189	ASSERT(t->task);	190	ASSERT(t->task);
190	ASSERT(t->cpu);	191	ASSERT(t->cpu);
191		192
192	spinlock_lock(&t->cpu->lock);	193	spinlock_lock(&t->cpu->lock);
193	if(t->cpu->fpu_owner==t)	194	if(t->cpu->fpu_owner==t)
194	t->cpu->fpu_owner=NULL;	195	t->cpu->fpu_owner=NULL;
195	spinlock_unlock(&t->cpu->lock);	196	spinlock_unlock(&t->cpu->lock);
196		197
197	/*	198	/*
198	* Detach from the containing task.	199	* Detach from the containing task.
199	*/	200	*/
200	spinlock_lock(&t->task->lock);	201	spinlock_lock(&t->task->lock);
201	list_remove(&t->th_link);	202	list_remove(&t->th_link);
202	spinlock_unlock(&t->task->lock);	203	spinlock_unlock(&t->task->lock);
203		204
204	spinlock_unlock(&t->lock);	205	spinlock_unlock(&t->lock);
205		206
206	spinlock_lock(&threads_lock);	207	spinlock_lock(&threads_lock);
207	list_remove(&t->threads_link);	208	list_remove(&t->threads_link);
208	spinlock_unlock(&threads_lock);	209	spinlock_unlock(&threads_lock);
209		210
210	slab_free(thread_slab, t);	211	slab_free(thread_slab, t);
211	}	212	}
212		213
213		214
214	/** Create new thread	215	/** Create new thread
215	*	216	*
216	* Create a new thread.	217	* Create a new thread.
217	*	218	*
218	* @param func Thread's implementing function.	219	* @param func Thread's implementing function.
219	* @param arg Thread's implementing function argument.	220	* @param arg Thread's implementing function argument.
220	* @param task Task to which the thread belongs.	221	* @param task Task to which the thread belongs.
221	* @param flags Thread flags.	222	* @param flags Thread flags.
222	*	223	*
223	* @return New thread's structure on success, NULL on failure.	224	* @return New thread's structure on success, NULL on failure.
224	*	225	*
225	*/	226	*/
226	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)	227	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)
227	{	228	{
228	thread_t *t;	229	thread_t *t;
229	ipl_t ipl;	230	ipl_t ipl;
230		231
231	t = (thread_t *) slab_alloc(thread_slab, 0);	232	t = (thread_t *) slab_alloc(thread_slab, 0);
-		233	if (!t)
-		234	return NULL;
232		235
233	/* Not needed, but good for debugging */	236	/* Not needed, but good for debugging */
234	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	237	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
235		238
236	ipl = interrupts_disable();	239	ipl = interrupts_disable();
237	spinlock_lock(&tidlock);	240	spinlock_lock(&tidlock);
238	t->tid = ++last_tid;	241	t->tid = ++last_tid;
239	spinlock_unlock(&tidlock);	242	spinlock_unlock(&tidlock);
240	interrupts_restore(ipl);	243	interrupts_restore(ipl);
241		244
242	context_save(&t->saved_context);	245	context_save(&t->saved_context);
243	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	246	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
244		247
245	the_initialize((the_t *) t->kstack);	248	the_initialize((the_t *) t->kstack);
246		249
247	ipl = interrupts_disable();	250	ipl = interrupts_disable();
248	t->saved_context.ipl = interrupts_read();	251	t->saved_context.ipl = interrupts_read();
249	interrupts_restore(ipl);	252	interrupts_restore(ipl);
250		253
251	t->thread_code = func;	254	t->thread_code = func;
252	t->thread_arg = arg;	255	t->thread_arg = arg;
253	t->ticks = -1;	256	t->ticks = -1;
254	t->priority = -1; /* start in rq[0] */	257	t->priority = -1; /* start in rq[0] */
255	t->cpu = NULL;	258	t->cpu = NULL;
256	t->flags = 0;	259	t->flags = 0;
257	t->state = Entering;	260	t->state = Entering;
258	t->call_me = NULL;	261	t->call_me = NULL;
259	t->call_me_with = NULL;	262	t->call_me_with = NULL;
260		263
261	timeout_initialize(&t->sleep_timeout);	264	timeout_initialize(&t->sleep_timeout);
262	t->sleep_queue = NULL;	265	t->sleep_queue = NULL;
263	t->timeout_pending = 0;	266	t->timeout_pending = 0;
264		267
265	t->rwlock_holder_type = RWLOCK_NONE;	268	t->rwlock_holder_type = RWLOCK_NONE;
266		269
267	t->task = task;	270	t->task = task;
268		271
269	t->fpu_context_exists=0;	272	t->fpu_context_exists=0;
270	t->fpu_context_engaged=0;	273	t->fpu_context_engaged=0;
271		274
272	/*	275	/*
273	* Register this thread in the system-wide list.	276	* Register this thread in the system-wide list.
274	*/	277	*/
275	ipl = interrupts_disable();	278	ipl = interrupts_disable();
276	spinlock_lock(&threads_lock);	279	spinlock_lock(&threads_lock);
277	list_append(&t->threads_link, &threads_head);	280	list_append(&t->threads_link, &threads_head);
278	spinlock_unlock(&threads_lock);	281	spinlock_unlock(&threads_lock);
279		282
280	/*	283	/*
281	* Attach to the containing task.	284	* Attach to the containing task.
282	*/	285	*/
283	spinlock_lock(&task->lock);	286	spinlock_lock(&task->lock);
284	list_append(&t->th_link, &task->th_head);	287	list_append(&t->th_link, &task->th_head);
285	spinlock_unlock(&task->lock);	288	spinlock_unlock(&task->lock);
286		289
287	interrupts_restore(ipl);	290	interrupts_restore(ipl);
288		291
289	return t;	292	return t;
290	}	293	}
291		294
292		295
293	/** Make thread exiting	296	/** Make thread exiting
294	*	297	*
295	* End current thread execution and switch it to the exiting	298	* End current thread execution and switch it to the exiting
296	* state. All pending timeouts are executed.	299	* state. All pending timeouts are executed.
297	*	300	*
298	*/	301	*/
299	void thread_exit(void)	302	void thread_exit(void)
300	{	303	{
301	ipl_t ipl;	304	ipl_t ipl;
302		305
303	restart:	306	restart:
304	ipl = interrupts_disable();	307	ipl = interrupts_disable();
305	spinlock_lock(&THREAD->lock);	308	spinlock_lock(&THREAD->lock);
306	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	309	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
307	spinlock_unlock(&THREAD->lock);	310	spinlock_unlock(&THREAD->lock);
308	interrupts_restore(ipl);	311	interrupts_restore(ipl);
309	goto restart;	312	goto restart;
310	}	313	}
311	THREAD->state = Exiting;	314	THREAD->state = Exiting;
312	spinlock_unlock(&THREAD->lock);	315	spinlock_unlock(&THREAD->lock);
313	scheduler();	316	scheduler();
314	}	317	}
315		318
316		319
317	/** Thread sleep	320	/** Thread sleep
318	*	321	*
319	* Suspend execution of the current thread.	322	* Suspend execution of the current thread.
320	*	323	*
321	* @param sec Number of seconds to sleep.	324	* @param sec Number of seconds to sleep.
322	*	325	*
323	*/	326	*/
324	void thread_sleep(__u32 sec)	327	void thread_sleep(__u32 sec)
325	{	328	{
326	thread_usleep(sec*1000000);	329	thread_usleep(sec*1000000);
327	}	330	}
328		331
329		332
330	/** Thread usleep	333	/** Thread usleep
331	*	334	*
332	* Suspend execution of the current thread.	335	* Suspend execution of the current thread.
333	*	336	*
334	* @param usec Number of microseconds to sleep.	337	* @param usec Number of microseconds to sleep.
335	*	338	*
336	*/	339	*/
337	void thread_usleep(__u32 usec)	340	void thread_usleep(__u32 usec)
338	{	341	{
339	waitq_t wq;	342	waitq_t wq;
340		343
341	waitq_initialize(&wq);	344	waitq_initialize(&wq);
342		345
343	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	346	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
344	}	347	}
345		348
346		349
347	/** Register thread out-of-context invocation	350	/** Register thread out-of-context invocation
348	*	351	*
349	* Register a function and its argument to be executed	352	* Register a function and its argument to be executed
350	* on next context switch to the current thread.	353	* on next context switch to the current thread.
351	*	354	*
352	* @param call_me Out-of-context function.	355	* @param call_me Out-of-context function.
353	* @param call_me_with Out-of-context function argument.	356	* @param call_me_with Out-of-context function argument.
354	*	357	*
355	*/	358	*/
356	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	359	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
357	{	360	{
358	ipl_t ipl;	361	ipl_t ipl;
359		362
360	ipl = interrupts_disable();	363	ipl = interrupts_disable();
361	spinlock_lock(&THREAD->lock);	364	spinlock_lock(&THREAD->lock);
362	THREAD->call_me = call_me;	365	THREAD->call_me = call_me;
363	THREAD->call_me_with = call_me_with;	366	THREAD->call_me_with = call_me_with;
364	spinlock_unlock(&THREAD->lock);	367	spinlock_unlock(&THREAD->lock);
365	interrupts_restore(ipl);	368	interrupts_restore(ipl);
366	}	369	}
367		370
368	/** Print list of threads debug info */	371	/** Print list of threads debug info */
369	void thread_print_list(void)	372	void thread_print_list(void)
370	{	373	{
371	link_t *cur;	374	link_t *cur;
372	thread_t *t;	375	thread_t *t;
373	ipl_t ipl;	376	ipl_t ipl;
374		377
375	/* Messing with thread structures, avoid deadlock */	378	/* Messing with thread structures, avoid deadlock */
376	ipl = interrupts_disable();	379	ipl = interrupts_disable();
377	spinlock_lock(&threads_lock);	380	spinlock_lock(&threads_lock);
378		381
379	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	382	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
380	t = list_get_instance(cur, thread_t, threads_link);	383	t = list_get_instance(cur, thread_t, threads_link);
381	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);	384	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
382	if (t->cpu)	385	if (t->cpu)
383	printf("cpu%d ", t->cpu->id);	386	printf("cpu%d ", t->cpu->id);
384		387
385	printf("\n");	388	printf("\n");
386	}	389	}
387		390
388	spinlock_unlock(&threads_lock);	391	spinlock_unlock(&threads_lock);
389	interrupts_enable();	392	interrupts_enable();
390	}	393	}
391		394

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/proc/thread.c @ 2712 – Rev 822 → 842