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;
#ifdef ARCH_HAS_FPU
slab_cache_t *fpu_context_slab;
#endif
 
 
/** Thread wrapper
 *
 * This wrapper is provided to ensure that every thread
 * makes a call to thread_exit() when its implementing
 * function returns.
 *
 * interrupts_disable() is assumed.
 *
 */
static void cushion(void)
{
    void (*f)(void *) = THREAD->thread_code;
    void *arg = THREAD->thread_arg;
 
    /* this is where each thread wakes up after its creation */
    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);
   
#ifdef ARCH_HAS_FPU
#  ifdef CONFIG_FPU_LAZY
    t->saved_fpu_context = NULL;
#  else
    t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
    if (!t->saved_fpu_context)
        return -1;
#  endif
#endif  
 
    pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA | kmflags,&status);
    if (status) {
#ifdef ARCH_HAS_FPU
        if (t->saved_fpu_context)
            slab_free(fpu_context_slab,t->saved_fpu_context);
#endif
        return -1;
    }
    t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
 
    return 0;
}
 
/** Destruction of thread_t object */
static int thr_destructor(void *obj)
{
    thread_t *t = (thread_t *)obj;
 
    frame_free(ADDR2PFN(KA2PA(t->kstack)));
#ifdef ARCH_HAS_FPU
    if (t->saved_fpu_context)
        slab_free(fpu_context_slab,t->saved_fpu_context);
#endif
    return 1; /* One page freed */
}
 
/** Initialize threads
 *
 * Initialize kernel threads support.
 *
 */
void thread_init(void)
{
    THREAD = NULL;
    atomic_set(&nrdy,0);
    thread_slab = slab_cache_create("thread_slab",
                    sizeof(thread_t),0,
                    thr_constructor, thr_destructor, 0);
#ifdef ARCH_HAS_FPU
    fpu_context_slab = slab_cache_create("fpu_slab",
                         sizeof(fpu_context_t),
                         FPU_CONTEXT_ALIGN,
                         NULL, NULL, 0);
#endif
}
 
 
/** 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 906	Rev 935
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	#ifdef ARCH_HAS_FPU	66	#ifdef ARCH_HAS_FPU
67	slab_cache_t *fpu_context_slab;	67	slab_cache_t *fpu_context_slab;
68	#endif	68	#endif
69		69
70		70
71	/** Thread wrapper	71	/** Thread wrapper
72	*	72	*
73	* This wrapper is provided to ensure that every thread	73	* This wrapper is provided to ensure that every thread
74	* makes a call to thread_exit() when its implementing	74	* makes a call to thread_exit() when its implementing
75	* function returns.	75	* function returns.
76	*	76	*
77	* interrupts_disable() is assumed.	77	* interrupts_disable() is assumed.
78	*	78	*
79	*/	79	*/
80	static void cushion(void)	80	static void cushion(void)
81	{	81	{
82	void (f)(void ) = THREAD->thread_code;	82	void (f)(void ) = THREAD->thread_code;
83	void *arg = THREAD->thread_arg;	83	void *arg = THREAD->thread_arg;
84		84
85	/* this is where each thread wakes up after its creation */	85	/* this is where each thread wakes up after its creation */
86	before_thread_runs();	86	before_thread_runs();
87		87
88	spinlock_unlock(&THREAD->lock);	88	spinlock_unlock(&THREAD->lock);
89	interrupts_enable();	89	interrupts_enable();
90		90
91	f(arg);	91	f(arg);
92	thread_exit();	92	thread_exit();
93	/* not reached */	93	/* not reached */
94	}	94	}
95		95
96	/** Initialization and allocation for thread_t structure */	96	/** Initialization and allocation for thread_t structure */
97	static int thr_constructor(void *obj, int kmflags)	97	static int thr_constructor(void *obj, int kmflags)
98	{	98	{
99	thread_t t = (thread_t )obj;	99	thread_t t = (thread_t )obj;
100	pfn_t pfn;	100	pfn_t pfn;
101	int status;	101	int status;
102		102
103	spinlock_initialize(&t->lock, "thread_t_lock");	103	spinlock_initialize(&t->lock, "thread_t_lock");
104	link_initialize(&t->rq_link);	104	link_initialize(&t->rq_link);
105	link_initialize(&t->wq_link);	105	link_initialize(&t->wq_link);
106	link_initialize(&t->th_link);	106	link_initialize(&t->th_link);
107	link_initialize(&t->threads_link);	107	link_initialize(&t->threads_link);
108		108
109	#ifdef ARCH_HAS_FPU	109	#ifdef ARCH_HAS_FPU
110	# ifdef CONFIG_FPU_LAZY	110	# ifdef CONFIG_FPU_LAZY
111	t->saved_fpu_context = NULL;	111	t->saved_fpu_context = NULL;
112	# else	112	# else
113	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	113	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
114	if (!t->saved_fpu_context)	114	if (!t->saved_fpu_context)
115	return -1;	115	return -1;
116	# endif	116	# endif
117	#endif	117	#endif
118		118
119	pfn = frame_alloc_rc(ONE_FRAME, FRAME_KA \| kmflags,&status);	119	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
120	if (status) {	120	if (status) {
121	#ifdef ARCH_HAS_FPU	121	#ifdef ARCH_HAS_FPU
122	if (t->saved_fpu_context)	122	if (t->saved_fpu_context)
123	slab_free(fpu_context_slab,t->saved_fpu_context);	123	slab_free(fpu_context_slab,t->saved_fpu_context);
124	#endif	124	#endif
125	return -1;	125	return -1;
126	}	126	}
127	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	127	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
128		128
129	return 0;	129	return 0;
130	}	130	}
131		131
132	/** Destruction of thread_t object */	132	/** Destruction of thread_t object */
133	static int thr_destructor(void *obj)	133	static int thr_destructor(void *obj)
134	{	134	{
135	thread_t t = (thread_t )obj;	135	thread_t t = (thread_t )obj;
136		136
137	frame_free(ADDR2PFN(KA2PA(t->kstack)));	137	frame_free(ADDR2PFN(KA2PA(t->kstack)));
138	#ifdef ARCH_HAS_FPU	138	#ifdef ARCH_HAS_FPU
139	if (t->saved_fpu_context)	139	if (t->saved_fpu_context)
140	slab_free(fpu_context_slab,t->saved_fpu_context);	140	slab_free(fpu_context_slab,t->saved_fpu_context);
141	#endif	141	#endif
142	return 1; /* One page freed */	142	return 1; /* One page freed */
143	}	143	}
144		144
145	/** Initialize threads	145	/** Initialize threads
146	*	146	*
147	* Initialize kernel threads support.	147	* Initialize kernel threads support.
148	*	148	*
149	*/	149	*/
150	void thread_init(void)	150	void thread_init(void)
151	{	151	{
152	THREAD = NULL;	152	THREAD = NULL;
153	atomic_set(&nrdy,0);	153	atomic_set(&nrdy,0);
154	thread_slab = slab_cache_create("thread_slab",	154	thread_slab = slab_cache_create("thread_slab",
155	sizeof(thread_t),0,	155	sizeof(thread_t),0,
156	thr_constructor, thr_destructor, 0);	156	thr_constructor, thr_destructor, 0);
157	#ifdef ARCH_HAS_FPU	157	#ifdef ARCH_HAS_FPU
158	fpu_context_slab = slab_cache_create("fpu_slab",	158	fpu_context_slab = slab_cache_create("fpu_slab",
159	sizeof(fpu_context_t),	159	sizeof(fpu_context_t),
160	FPU_CONTEXT_ALIGN,	160	FPU_CONTEXT_ALIGN,
161	NULL, NULL, 0);	161	NULL, NULL, 0);
162	#endif	162	#endif
163	}	163	}
164		164
165		165
166	/** Make thread ready	166	/** Make thread ready
167	*	167	*
168	* Switch thread t to the ready state.	168	* Switch thread t to the ready state.
169	*	169	*
170	* @param t Thread to make ready.	170	* @param t Thread to make ready.
171	*	171	*
172	*/	172	*/
173	void thread_ready(thread_t *t)	173	void thread_ready(thread_t *t)
174	{	174	{
175	cpu_t *cpu;	175	cpu_t *cpu;
176	runq_t *r;	176	runq_t *r;
177	ipl_t ipl;	177	ipl_t ipl;
178	int i, avg;	178	int i, avg;
179		179
180	ipl = interrupts_disable();	180	ipl = interrupts_disable();
181		181
182	spinlock_lock(&t->lock);	182	spinlock_lock(&t->lock);
183		183
184	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	184	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
185		185
186	cpu = CPU;	186	cpu = CPU;
187	if (t->flags & X_WIRED) {	187	if (t->flags & X_WIRED) {
188	cpu = t->cpu;	188	cpu = t->cpu;
189	}	189	}
190	spinlock_unlock(&t->lock);	190	spinlock_unlock(&t->lock);
191		191
192	/*	192	/*
193	* Append t to respective ready queue on respective processor.	193	* Append t to respective ready queue on respective processor.
194	*/	194	*/
195	r = &cpu->rq[i];	195	r = &cpu->rq[i];
196	spinlock_lock(&r->lock);	196	spinlock_lock(&r->lock);
197	list_append(&t->rq_link, &r->rq_head);	197	list_append(&t->rq_link, &r->rq_head);
198	r->n++;	198	r->n++;
199	spinlock_unlock(&r->lock);	199	spinlock_unlock(&r->lock);
200		200
201	atomic_inc(&nrdy);	201	atomic_inc(&nrdy);
202	avg = atomic_get(&nrdy) / config.cpu_active;	202	avg = atomic_get(&nrdy) / config.cpu_active;
203	atomic_inc(&cpu->nrdy);	203	atomic_inc(&cpu->nrdy);
204		204
205	interrupts_restore(ipl);	205	interrupts_restore(ipl);
206	}	206	}
207		207
208		208
209	/** Destroy thread memory structure	209	/** Destroy thread memory structure
210	*	210	*
211	* Detach thread from all queues, cpus etc. and destroy it.	211	* Detach thread from all queues, cpus etc. and destroy it.
212	*	212	*
213	* Assume thread->lock is held!!	213	* Assume thread->lock is held!!
214	*/	214	*/
215	void thread_destroy(thread_t *t)	215	void thread_destroy(thread_t *t)
216	{	216	{
217	ASSERT(t->state == Exiting);	217	ASSERT(t->state == Exiting);
218	ASSERT(t->task);	218	ASSERT(t->task);
219	ASSERT(t->cpu);	219	ASSERT(t->cpu);
220		220
221	spinlock_lock(&t->cpu->lock);	221	spinlock_lock(&t->cpu->lock);
222	if(t->cpu->fpu_owner==t)	222	if(t->cpu->fpu_owner==t)
223	t->cpu->fpu_owner=NULL;	223	t->cpu->fpu_owner=NULL;
224	spinlock_unlock(&t->cpu->lock);	224	spinlock_unlock(&t->cpu->lock);
225		225
226	/*	226	/*
227	* Detach from the containing task.	227	* Detach from the containing task.
228	*/	228	*/
229	spinlock_lock(&t->task->lock);	229	spinlock_lock(&t->task->lock);
230	list_remove(&t->th_link);	230	list_remove(&t->th_link);
231	spinlock_unlock(&t->task->lock);	231	spinlock_unlock(&t->task->lock);
232		232
233	spinlock_unlock(&t->lock);	233	spinlock_unlock(&t->lock);
234		234
235	spinlock_lock(&threads_lock);	235	spinlock_lock(&threads_lock);
236	list_remove(&t->threads_link);	236	list_remove(&t->threads_link);
237	spinlock_unlock(&threads_lock);	237	spinlock_unlock(&threads_lock);
238		238
239	slab_free(thread_slab, t);	239	slab_free(thread_slab, t);
240	}	240	}
241		241
242		242
243	/** Create new thread	243	/** Create new thread
244	*	244	*
245	* Create a new thread.	245	* Create a new thread.
246	*	246	*
247	* @param func Thread's implementing function.	247	* @param func Thread's implementing function.
248	* @param arg Thread's implementing function argument.	248	* @param arg Thread's implementing function argument.
249	* @param task Task to which the thread belongs.	249	* @param task Task to which the thread belongs.
250	* @param flags Thread flags.	250	* @param flags Thread flags.
251	*	251	*
252	* @return New thread's structure on success, NULL on failure.	252	* @return New thread's structure on success, NULL on failure.
253	*	253	*
254	*/	254	*/
255	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)	255	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)
256	{	256	{
257	thread_t *t;	257	thread_t *t;
258	ipl_t ipl;	258	ipl_t ipl;
259		259
260	t = (thread_t *) slab_alloc(thread_slab, 0);	260	t = (thread_t *) slab_alloc(thread_slab, 0);
261	if (!t)	261	if (!t)
262	return NULL;	262	return NULL;
263		263
264	/* Not needed, but good for debugging */	264	/* Not needed, but good for debugging */
265	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	265	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
266		266
267	ipl = interrupts_disable();	267	ipl = interrupts_disable();
268	spinlock_lock(&tidlock);	268	spinlock_lock(&tidlock);
269	t->tid = ++last_tid;	269	t->tid = ++last_tid;
270	spinlock_unlock(&tidlock);	270	spinlock_unlock(&tidlock);
271	interrupts_restore(ipl);	271	interrupts_restore(ipl);
272		272
273	context_save(&t->saved_context);	273	context_save(&t->saved_context);
274	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	274	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
275		275
276	the_initialize((the_t *) t->kstack);	276	the_initialize((the_t *) t->kstack);
277		277
278	ipl = interrupts_disable();	278	ipl = interrupts_disable();
279	t->saved_context.ipl = interrupts_read();	279	t->saved_context.ipl = interrupts_read();
280	interrupts_restore(ipl);	280	interrupts_restore(ipl);
281		281
282	t->thread_code = func;	282	t->thread_code = func;
283	t->thread_arg = arg;	283	t->thread_arg = arg;
284	t->ticks = -1;	284	t->ticks = -1;
285	t->priority = -1; /* start in rq[0] */	285	t->priority = -1; /* start in rq[0] */
286	t->cpu = NULL;	286	t->cpu = NULL;
287	t->flags = 0;	287	t->flags = 0;
288	t->state = Entering;	288	t->state = Entering;
289	t->call_me = NULL;	289	t->call_me = NULL;
290	t->call_me_with = NULL;	290	t->call_me_with = NULL;
291		291
292	timeout_initialize(&t->sleep_timeout);	292	timeout_initialize(&t->sleep_timeout);
293	t->sleep_queue = NULL;	293	t->sleep_queue = NULL;
294	t->timeout_pending = 0;	294	t->timeout_pending = 0;
295		295
296	t->rwlock_holder_type = RWLOCK_NONE;	296	t->rwlock_holder_type = RWLOCK_NONE;
297		297
298	t->task = task;	298	t->task = task;
299		299
300	t->fpu_context_exists = 0;	300	t->fpu_context_exists = 0;
301	t->fpu_context_engaged = 0;	301	t->fpu_context_engaged = 0;
302		302
303	/*	303	/*
304	* Register this thread in the system-wide list.	304	* Register this thread in the system-wide list.
305	*/	305	*/
306	ipl = interrupts_disable();	306	ipl = interrupts_disable();
307	spinlock_lock(&threads_lock);	307	spinlock_lock(&threads_lock);
308	list_append(&t->threads_link, &threads_head);	308	list_append(&t->threads_link, &threads_head);
309	spinlock_unlock(&threads_lock);	309	spinlock_unlock(&threads_lock);
310		310
311	/*	311	/*
312	* Attach to the containing task.	312	* Attach to the containing task.
313	*/	313	*/
314	spinlock_lock(&task->lock);	314	spinlock_lock(&task->lock);
315	list_append(&t->th_link, &task->th_head);	315	list_append(&t->th_link, &task->th_head);
316	spinlock_unlock(&task->lock);	316	spinlock_unlock(&task->lock);
317		317
318	interrupts_restore(ipl);	318	interrupts_restore(ipl);
319		319
320	return t;	320	return t;
321	}	321	}
322		322
323		323
324	/** Make thread exiting	324	/** Make thread exiting
325	*	325	*
326	* End current thread execution and switch it to the exiting	326	* End current thread execution and switch it to the exiting
327	* state. All pending timeouts are executed.	327	* state. All pending timeouts are executed.
328	*	328	*
329	*/	329	*/
330	void thread_exit(void)	330	void thread_exit(void)
331	{	331	{
332	ipl_t ipl;	332	ipl_t ipl;
333		333
334	restart:	334	restart:
335	ipl = interrupts_disable();	335	ipl = interrupts_disable();
336	spinlock_lock(&THREAD->lock);	336	spinlock_lock(&THREAD->lock);
337	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	337	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
338	spinlock_unlock(&THREAD->lock);	338	spinlock_unlock(&THREAD->lock);
339	interrupts_restore(ipl);	339	interrupts_restore(ipl);
340	goto restart;	340	goto restart;
341	}	341	}
342	THREAD->state = Exiting;	342	THREAD->state = Exiting;
343	spinlock_unlock(&THREAD->lock);	343	spinlock_unlock(&THREAD->lock);
344	scheduler();	344	scheduler();
345	}	345	}
346		346
347		347
348	/** Thread sleep	348	/** Thread sleep
349	*	349	*
350	* Suspend execution of the current thread.	350	* Suspend execution of the current thread.
351	*	351	*
352	* @param sec Number of seconds to sleep.	352	* @param sec Number of seconds to sleep.
353	*	353	*
354	*/	354	*/
355	void thread_sleep(__u32 sec)	355	void thread_sleep(__u32 sec)
356	{	356	{
357	thread_usleep(sec*1000000);	357	thread_usleep(sec*1000000);
358	}	358	}
359		359
360		360
361	/** Thread usleep	361	/** Thread usleep
362	*	362	*
363	* Suspend execution of the current thread.	363	* Suspend execution of the current thread.
364	*	364	*
365	* @param usec Number of microseconds to sleep.	365	* @param usec Number of microseconds to sleep.
366	*	366	*
367	*/	367	*/
368	void thread_usleep(__u32 usec)	368	void thread_usleep(__u32 usec)
369	{	369	{
370	waitq_t wq;	370	waitq_t wq;
371		371
372	waitq_initialize(&wq);	372	waitq_initialize(&wq);
373		373
374	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	374	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
375	}	375	}
376		376
377		377
378	/** Register thread out-of-context invocation	378	/** Register thread out-of-context invocation
379	*	379	*
380	* Register a function and its argument to be executed	380	* Register a function and its argument to be executed
381	* on next context switch to the current thread.	381	* on next context switch to the current thread.
382	*	382	*
383	* @param call_me Out-of-context function.	383	* @param call_me Out-of-context function.
384	* @param call_me_with Out-of-context function argument.	384	* @param call_me_with Out-of-context function argument.
385	*	385	*
386	*/	386	*/
387	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	387	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
388	{	388	{
389	ipl_t ipl;	389	ipl_t ipl;
390		390
391	ipl = interrupts_disable();	391	ipl = interrupts_disable();
392	spinlock_lock(&THREAD->lock);	392	spinlock_lock(&THREAD->lock);
393	THREAD->call_me = call_me;	393	THREAD->call_me = call_me;
394	THREAD->call_me_with = call_me_with;	394	THREAD->call_me_with = call_me_with;
395	spinlock_unlock(&THREAD->lock);	395	spinlock_unlock(&THREAD->lock);
396	interrupts_restore(ipl);	396	interrupts_restore(ipl);
397	}	397	}
398		398
399	/** Print list of threads debug info */	399	/** Print list of threads debug info */
400	void thread_print_list(void)	400	void thread_print_list(void)
401	{	401	{
402	link_t *cur;	402	link_t *cur;
403	thread_t *t;	403	thread_t *t;
404	ipl_t ipl;	404	ipl_t ipl;
405		405
406	/* Messing with thread structures, avoid deadlock */	406	/* Messing with thread structures, avoid deadlock */
407	ipl = interrupts_disable();	407	ipl = interrupts_disable();
408	spinlock_lock(&threads_lock);	408	spinlock_lock(&threads_lock);
409		409
410	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	410	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
411	t = list_get_instance(cur, thread_t, threads_link);	411	t = list_get_instance(cur, thread_t, threads_link);
412	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);	412	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
413	if (t->cpu)	413	if (t->cpu)
414	printf("cpu%d ", t->cpu->id);	414	printf("cpu%d ", t->cpu->id);
415		415
416	printf("\n");	416	printf("\n");
417	}	417	}
418		418
419	spinlock_unlock(&threads_lock);	419	spinlock_unlock(&threads_lock);
420	interrupts_enable();	420	interrupts_enable();
421	}	421	}
422		422

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(root)/kernel/trunk/generic/src/proc/thread.c – Rev 906 → 935