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;
    ipl_t ipl;
   
    t = (thread_t *) slab_alloc(thread_slab, 0);
 
 
   
    /* 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 814	Rev 822
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		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	pfn = frame_alloc(ONE_FRAME, FRAME_KA \| kmflags);	105	pfn = frame_alloc(ONE_FRAME, FRAME_KA \| kmflags);
106	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	106	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
107	if (!t->kstack)	107	if (!t->kstack)
108	return -1;	108	return -1;
109		109
110	return 0;	110	return 0;
111	}	111	}
112		112
113	/** Destruction of thread_t object */	113	/** Destruction of thread_t object */
114	static int thr_destructor(void *obj)	114	static int thr_destructor(void *obj)
115	{	115	{
116	thread_t t = (thread_t )obj;	116	thread_t t = (thread_t )obj;
117		117
118	frame_free(ADDR2PFN(KA2PA(t->kstack)));	118	frame_free(ADDR2PFN(KA2PA(t->kstack)));
119	return 1; /* One page freed */	119	return 1; /* One page freed */
120	}	120	}
121		121
122	/** Initialize threads	122	/** Initialize threads
123	*	123	*
124	* Initialize kernel threads support.	124	* Initialize kernel threads support.
125	*	125	*
126	*/	126	*/
127	void thread_init(void)	127	void thread_init(void)
128	{	128	{
129	THREAD = NULL;	129	THREAD = NULL;
130	atomic_set(&nrdy,0);	130	atomic_set(&nrdy,0);
131	thread_slab = slab_cache_create("thread_slab",	131	thread_slab = slab_cache_create("thread_slab",
132	sizeof(thread_t),0,	132	sizeof(thread_t),0,
133	thr_constructor, thr_destructor, 0);	133	thr_constructor, thr_destructor, 0);
134	}	134	}
135		135
136		136
137	/** Make thread ready	137	/** Make thread ready
138	*	138	*
139	* Switch thread t to the ready state.	139	* Switch thread t to the ready state.
140	*	140	*
141	* @param t Thread to make ready.	141	* @param t Thread to make ready.
142	*	142	*
143	*/	143	*/
144	void thread_ready(thread_t *t)	144	void thread_ready(thread_t *t)
145	{	145	{
146	cpu_t *cpu;	146	cpu_t *cpu;
147	runq_t *r;	147	runq_t *r;
148	ipl_t ipl;	148	ipl_t ipl;
149	int i, avg;	149	int i, avg;
150		150
151	ipl = interrupts_disable();	151	ipl = interrupts_disable();
152		152
153	spinlock_lock(&t->lock);	153	spinlock_lock(&t->lock);
154		154
155	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	155	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
156		156
157	cpu = CPU;	157	cpu = CPU;
158	if (t->flags & X_WIRED) {	158	if (t->flags & X_WIRED) {
159	cpu = t->cpu;	159	cpu = t->cpu;
160	}	160	}
161	spinlock_unlock(&t->lock);	161	spinlock_unlock(&t->lock);
162		162
163	/*	163	/*
164	* Append t to respective ready queue on respective processor.	164	* Append t to respective ready queue on respective processor.
165	*/	165	*/
166	r = &cpu->rq[i];	166	r = &cpu->rq[i];
167	spinlock_lock(&r->lock);	167	spinlock_lock(&r->lock);
168	list_append(&t->rq_link, &r->rq_head);	168	list_append(&t->rq_link, &r->rq_head);
169	r->n++;	169	r->n++;
170	spinlock_unlock(&r->lock);	170	spinlock_unlock(&r->lock);
171		171
172	atomic_inc(&nrdy);	172	atomic_inc(&nrdy);
173	avg = atomic_get(&nrdy) / config.cpu_active;	173	avg = atomic_get(&nrdy) / config.cpu_active;
174	atomic_inc(&cpu->nrdy);	174	atomic_inc(&cpu->nrdy);
175		175
176	interrupts_restore(ipl);	176	interrupts_restore(ipl);
177	}	177	}
178		178
179		179
180	/** Destroy thread memory structure	180	/** Destroy thread memory structure
181	*	181	*
182	* Detach thread from all queues, cpus etc. and destroy it.	182	* Detach thread from all queues, cpus etc. and destroy it.
183	*	183	*
184	* Assume thread->lock is held!!	184	* Assume thread->lock is held!!
185	*/	185	*/
186	void thread_destroy(thread_t *t)	186	void thread_destroy(thread_t *t)
187	{	187	{
188	ASSERT(t->state == Exiting);	188	ASSERT(t->state == Exiting);
189	ASSERT(t->task);	189	ASSERT(t->task);
190	ASSERT(t->cpu);	190	ASSERT(t->cpu);
191		191
192	spinlock_lock(&t->cpu->lock);	192	spinlock_lock(&t->cpu->lock);
193	if(t->cpu->fpu_owner==t)	193	if(t->cpu->fpu_owner==t)
194	t->cpu->fpu_owner=NULL;	194	t->cpu->fpu_owner=NULL;
195	spinlock_unlock(&t->cpu->lock);	195	spinlock_unlock(&t->cpu->lock);
196		196
197	/*	197	/*
198	* Detach from the containing task.	198	* Detach from the containing task.
199	*/	199	*/
200	spinlock_lock(&t->task->lock);	200	spinlock_lock(&t->task->lock);
201	list_remove(&t->th_link);	201	list_remove(&t->th_link);
202	spinlock_unlock(&t->task->lock);	202	spinlock_unlock(&t->task->lock);
203		203
204	spinlock_unlock(&t->lock);	204	spinlock_unlock(&t->lock);
205		205
206	spinlock_lock(&threads_lock);	206	spinlock_lock(&threads_lock);
207	list_remove(&t->threads_link);	207	list_remove(&t->threads_link);
208	spinlock_unlock(&threads_lock);	208	spinlock_unlock(&threads_lock);
209		209
210	slab_free(thread_slab, t);	210	slab_free(thread_slab, t);
211	}	211	}
212		212
213		213
214	/** Create new thread	214	/** Create new thread
215	*	215	*
216	* Create a new thread.	216	* Create a new thread.
217	*	217	*
218	* @param func Thread's implementing function.	218	* @param func Thread's implementing function.
219	* @param arg Thread's implementing function argument.	219	* @param arg Thread's implementing function argument.
220	* @param task Task to which the thread belongs.	220	* @param task Task to which the thread belongs.
221	* @param flags Thread flags.	221	* @param flags Thread flags.
222	*	222	*
223	* @return New thread's structure on success, NULL on failure.	223	* @return New thread's structure on success, NULL on failure.
224	*	224	*
225	*/	225	*/
226	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)
227	{	227	{
228	thread_t *t;	228	thread_t *t;
-		229	ipl_t ipl;
229		230
230	t = (thread_t *) slab_alloc(thread_slab, 0);	231	t = (thread_t *) slab_alloc(thread_slab, 0);
231	if (t) {	-
232	ipl_t ipl;	-
233		232
234	/* Not needed, but good for debugging */	233	/* Not needed, but good for debugging */
235	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	234	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
236		235
237	ipl = interrupts_disable();	236	ipl = interrupts_disable();
238	spinlock_lock(&tidlock);	237	spinlock_lock(&tidlock);
239	t->tid = ++last_tid;	238	t->tid = ++last_tid;
240	spinlock_unlock(&tidlock);	239	spinlock_unlock(&tidlock);
241	interrupts_restore(ipl);	240	interrupts_restore(ipl);
242		241
243	context_save(&t->saved_context);	242	context_save(&t->saved_context);
244	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	243	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
245		244
246	the_initialize((the_t *) t->kstack);	245	the_initialize((the_t *) t->kstack);
247		246
248	ipl = interrupts_disable();	247	ipl = interrupts_disable();
249	t->saved_context.ipl = interrupts_read();	248	t->saved_context.ipl = interrupts_read();
250	interrupts_restore(ipl);	249	interrupts_restore(ipl);
251		250
252	t->thread_code = func;	251	t->thread_code = func;
253	t->thread_arg = arg;	252	t->thread_arg = arg;
254	t->ticks = -1;	253	t->ticks = -1;
255	t->priority = -1; /* start in rq[0] */	254	t->priority = -1; /* start in rq[0] */
256	t->cpu = NULL;	255	t->cpu = NULL;
257	t->flags = 0;	256	t->flags = 0;
258	t->state = Entering;	257	t->state = Entering;
259	t->call_me = NULL;	258	t->call_me = NULL;
260	t->call_me_with = NULL;	259	t->call_me_with = NULL;
261		260
262	timeout_initialize(&t->sleep_timeout);	261	timeout_initialize(&t->sleep_timeout);
263	t->sleep_queue = NULL;	262	t->sleep_queue = NULL;
264	t->timeout_pending = 0;	263	t->timeout_pending = 0;
265		264
266	t->rwlock_holder_type = RWLOCK_NONE;	265	t->rwlock_holder_type = RWLOCK_NONE;
267		-
268	t->task = task;	-
269		-
270	t->fpu_context_exists=0;	-
271	t->fpu_context_engaged=0;	-
272		266
-		267	t->task = task;
-		268
-		269	t->fpu_context_exists=0;
-		270	t->fpu_context_engaged=0;
-		271
273	/*	272	/*
274	* Register this thread in the system-wide list.	273	* Register this thread in the system-wide list.
275	*/	274	*/
276	ipl = interrupts_disable();	275	ipl = interrupts_disable();
277	spinlock_lock(&threads_lock);	276	spinlock_lock(&threads_lock);
278	list_append(&t->threads_link, &threads_head);	277	list_append(&t->threads_link, &threads_head);
279	spinlock_unlock(&threads_lock);	278	spinlock_unlock(&threads_lock);
280		279
281	/*	280	/*
282	* Attach to the containing task.	281	* Attach to the containing task.
283	*/	282	*/
284	spinlock_lock(&task->lock);	283	spinlock_lock(&task->lock);
285	list_append(&t->th_link, &task->th_head);	284	list_append(&t->th_link, &task->th_head);
286	spinlock_unlock(&task->lock);	285	spinlock_unlock(&task->lock);
287		286
288	interrupts_restore(ipl);	287	interrupts_restore(ipl);
289	}	-
290		288
291	return t;	289	return t;
292	}	290	}
293		291
294		292
295	/** Make thread exiting	293	/** Make thread exiting
296	*	294	*
297	* End current thread execution and switch it to the exiting	295	* End current thread execution and switch it to the exiting
298	* state. All pending timeouts are executed.	296	* state. All pending timeouts are executed.
299	*	297	*
300	*/	298	*/
301	void thread_exit(void)	299	void thread_exit(void)
302	{	300	{
303	ipl_t ipl;	301	ipl_t ipl;
304		302
305	restart:	303	restart:
306	ipl = interrupts_disable();	304	ipl = interrupts_disable();
307	spinlock_lock(&THREAD->lock);	305	spinlock_lock(&THREAD->lock);
308	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	306	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
309	spinlock_unlock(&THREAD->lock);	307	spinlock_unlock(&THREAD->lock);
310	interrupts_restore(ipl);	308	interrupts_restore(ipl);
311	goto restart;	309	goto restart;
312	}	310	}
313	THREAD->state = Exiting;	311	THREAD->state = Exiting;
314	spinlock_unlock(&THREAD->lock);	312	spinlock_unlock(&THREAD->lock);
315	scheduler();	313	scheduler();
316	}	314	}
317		315
318		316
319	/** Thread sleep	317	/** Thread sleep
320	*	318	*
321	* Suspend execution of the current thread.	319	* Suspend execution of the current thread.
322	*	320	*
323	* @param sec Number of seconds to sleep.	321	* @param sec Number of seconds to sleep.
324	*	322	*
325	*/	323	*/
326	void thread_sleep(__u32 sec)	324	void thread_sleep(__u32 sec)
327	{	325	{
328	thread_usleep(sec*1000000);	326	thread_usleep(sec*1000000);
329	}	327	}
330		328
331		329
332	/** Thread usleep	330	/** Thread usleep
333	*	331	*
334	* Suspend execution of the current thread.	332	* Suspend execution of the current thread.
335	*	333	*
336	* @param usec Number of microseconds to sleep.	334	* @param usec Number of microseconds to sleep.
337	*	335	*
338	*/	336	*/
339	void thread_usleep(__u32 usec)	337	void thread_usleep(__u32 usec)
340	{	338	{
341	waitq_t wq;	339	waitq_t wq;
342		340
343	waitq_initialize(&wq);	341	waitq_initialize(&wq);
344		342
345	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	343	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
346	}	344	}
347		345
348		346
349	/** Register thread out-of-context invocation	347	/** Register thread out-of-context invocation
350	*	348	*
351	* Register a function and its argument to be executed	349	* Register a function and its argument to be executed
352	* on next context switch to the current thread.	350	* on next context switch to the current thread.
353	*	351	*
354	* @param call_me Out-of-context function.	352	* @param call_me Out-of-context function.
355	* @param call_me_with Out-of-context function argument.	353	* @param call_me_with Out-of-context function argument.
356	*	354	*
357	*/	355	*/
358	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	356	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
359	{	357	{
360	ipl_t ipl;	358	ipl_t ipl;
361		359
362	ipl = interrupts_disable();	360	ipl = interrupts_disable();
363	spinlock_lock(&THREAD->lock);	361	spinlock_lock(&THREAD->lock);
364	THREAD->call_me = call_me;	362	THREAD->call_me = call_me;
365	THREAD->call_me_with = call_me_with;	363	THREAD->call_me_with = call_me_with;
366	spinlock_unlock(&THREAD->lock);	364	spinlock_unlock(&THREAD->lock);
367	interrupts_restore(ipl);	365	interrupts_restore(ipl);
368	}	366	}
369		367
370	/** Print list of threads debug info */	368	/** Print list of threads debug info */
371	void thread_print_list(void)	369	void thread_print_list(void)
372	{	370	{
373	link_t *cur;	371	link_t *cur;
374	thread_t *t;	372	thread_t *t;
375	ipl_t ipl;	373	ipl_t ipl;
376		374
377	/* Messing with thread structures, avoid deadlock */	375	/* Messing with thread structures, avoid deadlock */
378	ipl = interrupts_disable();	376	ipl = interrupts_disable();
379	spinlock_lock(&threads_lock);	377	spinlock_lock(&threads_lock);
380		378
381	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	379	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
382	t = list_get_instance(cur, thread_t, threads_link);	380	t = list_get_instance(cur, thread_t, threads_link);
383	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);	381	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
384	if (t->cpu)	382	if (t->cpu)
385	printf("cpu%d ", t->cpu->id);	383	printf("cpu%d ", t->cpu->id);
386		384
387	printf("\n");	385	printf("\n");
388	}	386	}
389		387
390	spinlock_unlock(&threads_lock);	388	spinlock_unlock(&threads_lock);
391	interrupts_enable();	389	interrupts_enable();
392	}	390	}
393		391

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(root)/kernel/trunk/generic/src/proc/thread.c – Rev 814 → 822