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(ONE_FRAME, 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 860	Rev 906
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
-		67	slab_cache_t *fpu_context_slab;
-		68	#endif
66		69
67		70
68	/** Thread wrapper	71	/** Thread wrapper
69	*	72	*
70	* This wrapper is provided to ensure that every thread	73	* This wrapper is provided to ensure that every thread
71	* makes a call to thread_exit() when its implementing	74	* makes a call to thread_exit() when its implementing
72	* function returns.	75	* function returns.
73	*	76	*
74	* interrupts_disable() is assumed.	77	* interrupts_disable() is assumed.
75	*	78	*
76	*/	79	*/
77	static void cushion(void)	80	static void cushion(void)
78	{	81	{
79	void (f)(void ) = THREAD->thread_code;	82	void (f)(void ) = THREAD->thread_code;
80	void *arg = THREAD->thread_arg;	83	void *arg = THREAD->thread_arg;
81		84
82	/* this is where each thread wakes up after its creation */	85	/* this is where each thread wakes up after its creation */
83	before_thread_runs();	86	before_thread_runs();
84		87
85	spinlock_unlock(&THREAD->lock);	88	spinlock_unlock(&THREAD->lock);
86	interrupts_enable();	89	interrupts_enable();
87		90
88	f(arg);	91	f(arg);
89	thread_exit();	92	thread_exit();
90	/* not reached */	93	/* not reached */
91	}	94	}
92		95
93	/** Initialization and allocation for thread_t structure */	96	/** Initialization and allocation for thread_t structure */
94	static int thr_constructor(void *obj, int kmflags)	97	static int thr_constructor(void *obj, int kmflags)
95	{	98	{
96	thread_t t = (thread_t )obj;	99	thread_t t = (thread_t )obj;
97	pfn_t pfn;	100	pfn_t pfn;
98	int status;	101	int status;
99		102
100	spinlock_initialize(&t->lock, "thread_t_lock");	103	spinlock_initialize(&t->lock, "thread_t_lock");
101	link_initialize(&t->rq_link);	104	link_initialize(&t->rq_link);
102	link_initialize(&t->wq_link);	105	link_initialize(&t->wq_link);
103	link_initialize(&t->th_link);	106	link_initialize(&t->th_link);
104	link_initialize(&t->threads_link);	107	link_initialize(&t->threads_link);
105		108
-		109	#ifdef ARCH_HAS_FPU
-		110	# ifdef CONFIG_FPU_LAZY
-		111	t->saved_fpu_context = NULL;
-		112	# else
-		113	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
-		114	if (!t->saved_fpu_context)
-		115	return -1;
-		116	# endif
-		117	#endif
-		118
106	pfn = frame_alloc_rc(ONE_FRAME, FRAME_KA \| kmflags,&status);	119	pfn = frame_alloc_rc(ONE_FRAME, FRAME_KA \| kmflags,&status);
107	if (status)	120	if (status) {
-		121	#ifdef ARCH_HAS_FPU
-		122	if (t->saved_fpu_context)
-		123	slab_free(fpu_context_slab,t->saved_fpu_context);
-		124	#endif
108	return -1;	125	return -1;
-		126	}
109	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	127	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
110		128
111	return 0;	129	return 0;
112	}	130	}
113		131
114	/** Destruction of thread_t object */	132	/** Destruction of thread_t object */
115	static int thr_destructor(void *obj)	133	static int thr_destructor(void *obj)
116	{	134	{
117	thread_t t = (thread_t )obj;	135	thread_t t = (thread_t )obj;
118		136
119	frame_free(ADDR2PFN(KA2PA(t->kstack)));	137	frame_free(ADDR2PFN(KA2PA(t->kstack)));
-		138	#ifdef ARCH_HAS_FPU
-		139	if (t->saved_fpu_context)
-		140	slab_free(fpu_context_slab,t->saved_fpu_context);
-		141	#endif
120	return 1; /* One page freed */	142	return 1; /* One page freed */
121	}	143	}
122		144
123	/** Initialize threads	145	/** Initialize threads
124	*	146	*
125	* Initialize kernel threads support.	147	* Initialize kernel threads support.
126	*	148	*
127	*/	149	*/
128	void thread_init(void)	150	void thread_init(void)
129	{	151	{
130	THREAD = NULL;	152	THREAD = NULL;
131	atomic_set(&nrdy,0);	153	atomic_set(&nrdy,0);
132	thread_slab = slab_cache_create("thread_slab",	154	thread_slab = slab_cache_create("thread_slab",
133	sizeof(thread_t),0,	155	sizeof(thread_t),0,
134	thr_constructor, thr_destructor, 0);	156	thr_constructor, thr_destructor, 0);
-		157	#ifdef ARCH_HAS_FPU
-		158	fpu_context_slab = slab_cache_create("fpu_slab",
-		159	sizeof(fpu_context_t),
-		160	FPU_CONTEXT_ALIGN,
-		161	NULL, NULL, 0);
-		162	#endif
135	}	163	}
136		164
137		165
138	/** Make thread ready	166	/** Make thread ready
139	*	167	*
140	* Switch thread t to the ready state.	168	* Switch thread t to the ready state.
141	*	169	*
142	* @param t Thread to make ready.	170	* @param t Thread to make ready.
143	*	171	*
144	*/	172	*/
145	void thread_ready(thread_t *t)	173	void thread_ready(thread_t *t)
146	{	174	{
147	cpu_t *cpu;	175	cpu_t *cpu;
148	runq_t *r;	176	runq_t *r;
149	ipl_t ipl;	177	ipl_t ipl;
150	int i, avg;	178	int i, avg;
151		179
152	ipl = interrupts_disable();	180	ipl = interrupts_disable();
153		181
154	spinlock_lock(&t->lock);	182	spinlock_lock(&t->lock);
155		183
156	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	184	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
157		185
158	cpu = CPU;	186	cpu = CPU;
159	if (t->flags & X_WIRED) {	187	if (t->flags & X_WIRED) {
160	cpu = t->cpu;	188	cpu = t->cpu;
161	}	189	}
162	spinlock_unlock(&t->lock);	190	spinlock_unlock(&t->lock);
163		191
164	/*	192	/*
165	* Append t to respective ready queue on respective processor.	193	* Append t to respective ready queue on respective processor.
166	*/	194	*/
167	r = &cpu->rq[i];	195	r = &cpu->rq[i];
168	spinlock_lock(&r->lock);	196	spinlock_lock(&r->lock);
169	list_append(&t->rq_link, &r->rq_head);	197	list_append(&t->rq_link, &r->rq_head);
170	r->n++;	198	r->n++;
171	spinlock_unlock(&r->lock);	199	spinlock_unlock(&r->lock);
172		200
173	atomic_inc(&nrdy);	201	atomic_inc(&nrdy);
174	avg = atomic_get(&nrdy) / config.cpu_active;	202	avg = atomic_get(&nrdy) / config.cpu_active;
175	atomic_inc(&cpu->nrdy);	203	atomic_inc(&cpu->nrdy);
176		204
177	interrupts_restore(ipl);	205	interrupts_restore(ipl);
178	}	206	}
179		207
180		208
181	/** Destroy thread memory structure	209	/** Destroy thread memory structure
182	*	210	*
183	* Detach thread from all queues, cpus etc. and destroy it.	211	* Detach thread from all queues, cpus etc. and destroy it.
184	*	212	*
185	* Assume thread->lock is held!!	213	* Assume thread->lock is held!!
186	*/	214	*/
187	void thread_destroy(thread_t *t)	215	void thread_destroy(thread_t *t)
188	{	216	{
189	ASSERT(t->state == Exiting);	217	ASSERT(t->state == Exiting);
190	ASSERT(t->task);	218	ASSERT(t->task);
191	ASSERT(t->cpu);	219	ASSERT(t->cpu);
192		220
193	spinlock_lock(&t->cpu->lock);	221	spinlock_lock(&t->cpu->lock);
194	if(t->cpu->fpu_owner==t)	222	if(t->cpu->fpu_owner==t)
195	t->cpu->fpu_owner=NULL;	223	t->cpu->fpu_owner=NULL;
196	spinlock_unlock(&t->cpu->lock);	224	spinlock_unlock(&t->cpu->lock);
197		225
198	/*	226	/*
199	* Detach from the containing task.	227	* Detach from the containing task.
200	*/	228	*/
201	spinlock_lock(&t->task->lock);	229	spinlock_lock(&t->task->lock);
202	list_remove(&t->th_link);	230	list_remove(&t->th_link);
203	spinlock_unlock(&t->task->lock);	231	spinlock_unlock(&t->task->lock);
204		232
205	spinlock_unlock(&t->lock);	233	spinlock_unlock(&t->lock);
206		234
207	spinlock_lock(&threads_lock);	235	spinlock_lock(&threads_lock);
208	list_remove(&t->threads_link);	236	list_remove(&t->threads_link);
209	spinlock_unlock(&threads_lock);	237	spinlock_unlock(&threads_lock);
210		238
211	slab_free(thread_slab, t);	239	slab_free(thread_slab, t);
212	}	240	}
213		241
214		242
215	/** Create new thread	243	/** Create new thread
216	*	244	*
217	* Create a new thread.	245	* Create a new thread.
218	*	246	*
219	* @param func Thread's implementing function.	247	* @param func Thread's implementing function.
220	* @param arg Thread's implementing function argument.	248	* @param arg Thread's implementing function argument.
221	* @param task Task to which the thread belongs.	249	* @param task Task to which the thread belongs.
222	* @param flags Thread flags.	250	* @param flags Thread flags.
223	*	251	*
224	* @return New thread's structure on success, NULL on failure.	252	* @return New thread's structure on success, NULL on failure.
225	*	253	*
226	*/	254	*/
227	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)
228	{	256	{
229	thread_t *t;	257	thread_t *t;
230	ipl_t ipl;	258	ipl_t ipl;
231		259
232	t = (thread_t *) slab_alloc(thread_slab, 0);	260	t = (thread_t *) slab_alloc(thread_slab, 0);
233	if (!t)	261	if (!t)
234	return NULL;	262	return NULL;
235		263
236	/* Not needed, but good for debugging */	264	/* Not needed, but good for debugging */
237	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	265	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
238		266
239	ipl = interrupts_disable();	267	ipl = interrupts_disable();
240	spinlock_lock(&tidlock);	268	spinlock_lock(&tidlock);
241	t->tid = ++last_tid;	269	t->tid = ++last_tid;
242	spinlock_unlock(&tidlock);	270	spinlock_unlock(&tidlock);
243	interrupts_restore(ipl);	271	interrupts_restore(ipl);
244		272
245	context_save(&t->saved_context);	273	context_save(&t->saved_context);
246	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);
247		275
248	the_initialize((the_t *) t->kstack);	276	the_initialize((the_t *) t->kstack);
249		277
250	ipl = interrupts_disable();	278	ipl = interrupts_disable();
251	t->saved_context.ipl = interrupts_read();	279	t->saved_context.ipl = interrupts_read();
252	interrupts_restore(ipl);	280	interrupts_restore(ipl);
253		281
254	t->thread_code = func;	282	t->thread_code = func;
255	t->thread_arg = arg;	283	t->thread_arg = arg;
256	t->ticks = -1;	284	t->ticks = -1;
257	t->priority = -1; /* start in rq[0] */	285	t->priority = -1; /* start in rq[0] */
258	t->cpu = NULL;	286	t->cpu = NULL;
259	t->flags = 0;	287	t->flags = 0;
260	t->state = Entering;	288	t->state = Entering;
261	t->call_me = NULL;	289	t->call_me = NULL;
262	t->call_me_with = NULL;	290	t->call_me_with = NULL;
263		291
264	timeout_initialize(&t->sleep_timeout);	292	timeout_initialize(&t->sleep_timeout);
265	t->sleep_queue = NULL;	293	t->sleep_queue = NULL;
266	t->timeout_pending = 0;	294	t->timeout_pending = 0;
267		295
268	t->rwlock_holder_type = RWLOCK_NONE;	296	t->rwlock_holder_type = RWLOCK_NONE;
269		297
270	t->task = task;	298	t->task = task;
271		299
272	t->fpu_context_exists = 0;	300	t->fpu_context_exists = 0;
273	t->fpu_context_engaged = 0;	301	t->fpu_context_engaged = 0;
274		302
275	/*	303	/*
276	* Register this thread in the system-wide list.	304	* Register this thread in the system-wide list.
277	*/	305	*/
278	ipl = interrupts_disable();	306	ipl = interrupts_disable();
279	spinlock_lock(&threads_lock);	307	spinlock_lock(&threads_lock);
280	list_append(&t->threads_link, &threads_head);	308	list_append(&t->threads_link, &threads_head);
281	spinlock_unlock(&threads_lock);	309	spinlock_unlock(&threads_lock);
282		310
283	/*	311	/*
284	* Attach to the containing task.	312	* Attach to the containing task.
285	*/	313	*/
286	spinlock_lock(&task->lock);	314	spinlock_lock(&task->lock);
287	list_append(&t->th_link, &task->th_head);	315	list_append(&t->th_link, &task->th_head);
288	spinlock_unlock(&task->lock);	316	spinlock_unlock(&task->lock);
289		317
290	interrupts_restore(ipl);	318	interrupts_restore(ipl);
291		319
292	return t;	320	return t;
293	}	321	}
294		322
295		323
296	/** Make thread exiting	324	/** Make thread exiting
297	*	325	*
298	* End current thread execution and switch it to the exiting	326	* End current thread execution and switch it to the exiting
299	* state. All pending timeouts are executed.	327	* state. All pending timeouts are executed.
300	*	328	*
301	*/	329	*/
302	void thread_exit(void)	330	void thread_exit(void)
303	{	331	{
304	ipl_t ipl;	332	ipl_t ipl;
305		333
306	restart:	334	restart:
307	ipl = interrupts_disable();	335	ipl = interrupts_disable();
308	spinlock_lock(&THREAD->lock);	336	spinlock_lock(&THREAD->lock);
309	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	337	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
310	spinlock_unlock(&THREAD->lock);	338	spinlock_unlock(&THREAD->lock);
311	interrupts_restore(ipl);	339	interrupts_restore(ipl);
312	goto restart;	340	goto restart;
313	}	341	}
314	THREAD->state = Exiting;	342	THREAD->state = Exiting;
315	spinlock_unlock(&THREAD->lock);	343	spinlock_unlock(&THREAD->lock);
316	scheduler();	344	scheduler();
317	}	345	}
318		346
319		347
320	/** Thread sleep	348	/** Thread sleep
321	*	349	*
322	* Suspend execution of the current thread.	350	* Suspend execution of the current thread.
323	*	351	*
324	* @param sec Number of seconds to sleep.	352	* @param sec Number of seconds to sleep.
325	*	353	*
326	*/	354	*/
327	void thread_sleep(__u32 sec)	355	void thread_sleep(__u32 sec)
328	{	356	{
329	thread_usleep(sec*1000000);	357	thread_usleep(sec*1000000);
330	}	358	}
331		359
332		360
333	/** Thread usleep	361	/** Thread usleep
334	*	362	*
335	* Suspend execution of the current thread.	363	* Suspend execution of the current thread.
336	*	364	*
337	* @param usec Number of microseconds to sleep.	365	* @param usec Number of microseconds to sleep.
338	*	366	*
339	*/	367	*/
340	void thread_usleep(__u32 usec)	368	void thread_usleep(__u32 usec)
341	{	369	{
342	waitq_t wq;	370	waitq_t wq;
343		371
344	waitq_initialize(&wq);	372	waitq_initialize(&wq);
345		373
346	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	374	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
347	}	375	}
348		376
349		377
350	/** Register thread out-of-context invocation	378	/** Register thread out-of-context invocation
351	*	379	*
352	* Register a function and its argument to be executed	380	* Register a function and its argument to be executed
353	* on next context switch to the current thread.	381	* on next context switch to the current thread.
354	*	382	*
355	* @param call_me Out-of-context function.	383	* @param call_me Out-of-context function.
356	* @param call_me_with Out-of-context function argument.	384	* @param call_me_with Out-of-context function argument.
357	*	385	*
358	*/	386	*/
359	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)
360	{	388	{
361	ipl_t ipl;	389	ipl_t ipl;
362		390
363	ipl = interrupts_disable();	391	ipl = interrupts_disable();
364	spinlock_lock(&THREAD->lock);	392	spinlock_lock(&THREAD->lock);
365	THREAD->call_me = call_me;	393	THREAD->call_me = call_me;
366	THREAD->call_me_with = call_me_with;	394	THREAD->call_me_with = call_me_with;
367	spinlock_unlock(&THREAD->lock);	395	spinlock_unlock(&THREAD->lock);
368	interrupts_restore(ipl);	396	interrupts_restore(ipl);
369	}	397	}
370		398
371	/** Print list of threads debug info */	399	/** Print list of threads debug info */
372	void thread_print_list(void)	400	void thread_print_list(void)
373	{	401	{
374	link_t *cur;	402	link_t *cur;
375	thread_t *t;	403	thread_t *t;
376	ipl_t ipl;	404	ipl_t ipl;
377		405
378	/* Messing with thread structures, avoid deadlock */	406	/* Messing with thread structures, avoid deadlock */
379	ipl = interrupts_disable();	407	ipl = interrupts_disable();
380	spinlock_lock(&threads_lock);	408	spinlock_lock(&threads_lock);
381		409
382	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	410	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
383	t = list_get_instance(cur, thread_t, threads_link);	411	t = list_get_instance(cur, thread_t, threads_link);
384	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);	412	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
385	if (t->cpu)	413	if (t->cpu)
386	printf("cpu%d ", t->cpu->id);	414	printf("cpu%d ", t->cpu->id);
387		415
388	printf("\n");	416	printf("\n");
389	}	417	}
390		418
391	spinlock_unlock(&threads_lock);	419	spinlock_unlock(&threads_lock);
392	interrupts_enable();	420	interrupts_enable();
393	}	421	}
394		422

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(root)/kernel/trunk/generic/src/proc/thread.c – Rev 860 → 906