WebSVN – HelenOS – Diff – /branches/sparc/kernel/generic/src/proc/thread.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <proc/scheduler.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <mm/frame.h>
#include <mm/page.h>
#include <arch/asm.h>
#include <arch.h>
#include <synch/synch.h>
#include <synch/spinlock.h>
#include <synch/waitq.h>
#include <synch/rwlock.h>
#include <cpu.h>
#include <func.h>
#include <context.h>
#include <adt/list.h>
#include <typedefs.h>
#include <time/clock.h>
#include <adt/list.h>
#include <config.h>
#include <arch/interrupt.h>
#include <smp/ipi.h>
#include <arch/faddr.h>
#include <arch/atomic.h>
#include <memstr.h>
#include <print.h>
#include <mm/slab.h>
#include <debug.h>
#include <main/uinit.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.
 * @param name  Symbolic name.
 *
 * @return New thread's structure on success, NULL on failure.
 *
 */
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name)
{
    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);
   
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
   
    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("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
            t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
        if (t->cpu)
            printf("cpu%d ", t->cpu->id);
        else
            printf("none");
        printf("\n");
    }
 
    spinlock_unlock(&threads_lock);
    interrupts_restore(ipl);
}
 
/** Process syscall to create new thread.
 *
 */
__native sys_thread_create(__address function, void *arg, void *stack, char *name)
{
        thread_t *t;
        char namebuf[THREAD_NAME_BUFLEN];
    uspace_arg_t *uarg;
    __u32 tid;
 
        copy_from_uspace(namebuf, name, THREAD_NAME_BUFLEN);
    uarg = (uspace_arg_t *) malloc(sizeof(uarg), 0);
   
    uarg->uspace_entry = function;
    uarg->uspace_stack = (__address) stack;
 
        if ((t = thread_create(uinit, uarg, TASK, 0, namebuf))) {
        tid = t->tid;
                thread_ready(t);
        return (__native) tid;
        } else {
                free(namebuf);
        }
 
        return (__native) -1;
}
 
/** Process syscall to terminate thread.
 *
 */
__native sys_thread_exit(int status)
{
        thread_exit();
        /* Unreachable */
        return 0;
}
 

Rev 1062	Rev 1066
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	#include <main/uinit.h>
56		57
57	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	58	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
58		59
59	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /	60	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /
60	LIST_INITIALIZE(threads_head); /*< List of all threads. /	61	LIST_INITIALIZE(threads_head); /*< List of all threads. /
61		62
62	SPINLOCK_INITIALIZE(tidlock);	63	SPINLOCK_INITIALIZE(tidlock);
63	__u32 last_tid = 0;	64	__u32 last_tid = 0;
64		65
65	static slab_cache_t *thread_slab;	66	static slab_cache_t *thread_slab;
66	#ifdef ARCH_HAS_FPU	67	#ifdef ARCH_HAS_FPU
67	slab_cache_t *fpu_context_slab;	68	slab_cache_t *fpu_context_slab;
68	#endif	69	#endif
69		70
70		71
71	/** Thread wrapper	72	/** Thread wrapper
72	*	73	*
73	* This wrapper is provided to ensure that every thread	74	* This wrapper is provided to ensure that every thread
74	* makes a call to thread_exit() when its implementing	75	* makes a call to thread_exit() when its implementing
75	* function returns.	76	* function returns.
76	*	77	*
77	* interrupts_disable() is assumed.	78	* interrupts_disable() is assumed.
78	*	79	*
79	*/	80	*/
80	static void cushion(void)	81	static void cushion(void)
81	{	82	{
82	void (f)(void ) = THREAD->thread_code;	83	void (f)(void ) = THREAD->thread_code;
83	void *arg = THREAD->thread_arg;	84	void *arg = THREAD->thread_arg;
84		85
85	/* this is where each thread wakes up after its creation */	86	/* this is where each thread wakes up after its creation */
86	before_thread_runs();	87	before_thread_runs();
87		88
88	spinlock_unlock(&THREAD->lock);	89	spinlock_unlock(&THREAD->lock);
89	interrupts_enable();	90	interrupts_enable();
90		91
91	f(arg);	92	f(arg);
92	thread_exit();	93	thread_exit();
93	/* not reached */	94	/* not reached */
94	}	95	}
95		96
96	/** Initialization and allocation for thread_t structure */	97	/** Initialization and allocation for thread_t structure */
97	static int thr_constructor(void *obj, int kmflags)	98	static int thr_constructor(void *obj, int kmflags)
98	{	99	{
99	thread_t t = (thread_t )obj;	100	thread_t t = (thread_t )obj;
100	pfn_t pfn;	101	pfn_t pfn;
101	int status;	102	int status;
102		103
103	spinlock_initialize(&t->lock, "thread_t_lock");	104	spinlock_initialize(&t->lock, "thread_t_lock");
104	link_initialize(&t->rq_link);	105	link_initialize(&t->rq_link);
105	link_initialize(&t->wq_link);	106	link_initialize(&t->wq_link);
106	link_initialize(&t->th_link);	107	link_initialize(&t->th_link);
107	link_initialize(&t->threads_link);	108	link_initialize(&t->threads_link);
108		109
109	#ifdef ARCH_HAS_FPU	110	#ifdef ARCH_HAS_FPU
110	# ifdef CONFIG_FPU_LAZY	111	# ifdef CONFIG_FPU_LAZY
111	t->saved_fpu_context = NULL;	112	t->saved_fpu_context = NULL;
112	# else	113	# else
113	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	114	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
114	if (!t->saved_fpu_context)	115	if (!t->saved_fpu_context)
115	return -1;	116	return -1;
116	# endif	117	# endif
117	#endif	118	#endif
118		119
119	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	120	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
120	if (status) {	121	if (status) {
121	#ifdef ARCH_HAS_FPU	122	#ifdef ARCH_HAS_FPU
122	if (t->saved_fpu_context)	123	if (t->saved_fpu_context)
123	slab_free(fpu_context_slab,t->saved_fpu_context);	124	slab_free(fpu_context_slab,t->saved_fpu_context);
124	#endif	125	#endif
125	return -1;	126	return -1;
126	}	127	}
127	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	128	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
128		129
129	return 0;	130	return 0;
130	}	131	}
131		132
132	/** Destruction of thread_t object */	133	/** Destruction of thread_t object */
133	static int thr_destructor(void *obj)	134	static int thr_destructor(void *obj)
134	{	135	{
135	thread_t t = (thread_t )obj;	136	thread_t t = (thread_t )obj;
136		137
137	frame_free(ADDR2PFN(KA2PA(t->kstack)));	138	frame_free(ADDR2PFN(KA2PA(t->kstack)));
138	#ifdef ARCH_HAS_FPU	139	#ifdef ARCH_HAS_FPU
139	if (t->saved_fpu_context)	140	if (t->saved_fpu_context)
140	slab_free(fpu_context_slab,t->saved_fpu_context);	141	slab_free(fpu_context_slab,t->saved_fpu_context);
141	#endif	142	#endif
142	return 1; /* One page freed */	143	return 1; /* One page freed */
143	}	144	}
144		145
145	/** Initialize threads	146	/** Initialize threads
146	*	147	*
147	* Initialize kernel threads support.	148	* Initialize kernel threads support.
148	*	149	*
149	*/	150	*/
150	void thread_init(void)	151	void thread_init(void)
151	{	152	{
152	THREAD = NULL;	153	THREAD = NULL;
153	atomic_set(&nrdy,0);	154	atomic_set(&nrdy,0);
154	thread_slab = slab_cache_create("thread_slab",	155	thread_slab = slab_cache_create("thread_slab",
155	sizeof(thread_t),0,	156	sizeof(thread_t),0,
156	thr_constructor, thr_destructor, 0);	157	thr_constructor, thr_destructor, 0);
157	#ifdef ARCH_HAS_FPU	158	#ifdef ARCH_HAS_FPU
158	fpu_context_slab = slab_cache_create("fpu_slab",	159	fpu_context_slab = slab_cache_create("fpu_slab",
159	sizeof(fpu_context_t),	160	sizeof(fpu_context_t),
160	FPU_CONTEXT_ALIGN,	161	FPU_CONTEXT_ALIGN,
161	NULL, NULL, 0);	162	NULL, NULL, 0);
162	#endif	163	#endif
163	}	164	}
164		165
165		166
166	/** Make thread ready	167	/** Make thread ready
167	*	168	*
168	* Switch thread t to the ready state.	169	* Switch thread t to the ready state.
169	*	170	*
170	* @param t Thread to make ready.	171	* @param t Thread to make ready.
171	*	172	*
172	*/	173	*/
173	void thread_ready(thread_t *t)	174	void thread_ready(thread_t *t)
174	{	175	{
175	cpu_t *cpu;	176	cpu_t *cpu;
176	runq_t *r;	177	runq_t *r;
177	ipl_t ipl;	178	ipl_t ipl;
178	int i, avg;	179	int i, avg;
179		180
180	ipl = interrupts_disable();	181	ipl = interrupts_disable();
181		182
182	spinlock_lock(&t->lock);	183	spinlock_lock(&t->lock);
183		184
184	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	185	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
185		186
186	cpu = CPU;	187	cpu = CPU;
187	if (t->flags & X_WIRED) {	188	if (t->flags & X_WIRED) {
188	cpu = t->cpu;	189	cpu = t->cpu;
189	}	190	}
190	spinlock_unlock(&t->lock);	191	spinlock_unlock(&t->lock);
191		192
192	/*	193	/*
193	* Append t to respective ready queue on respective processor.	194	* Append t to respective ready queue on respective processor.
194	*/	195	*/
195	r = &cpu->rq[i];	196	r = &cpu->rq[i];
196	spinlock_lock(&r->lock);	197	spinlock_lock(&r->lock);
197	list_append(&t->rq_link, &r->rq_head);	198	list_append(&t->rq_link, &r->rq_head);
198	r->n++;	199	r->n++;
199	spinlock_unlock(&r->lock);	200	spinlock_unlock(&r->lock);
200		201
201	atomic_inc(&nrdy);	202	atomic_inc(&nrdy);
202	avg = atomic_get(&nrdy) / config.cpu_active;	203	avg = atomic_get(&nrdy) / config.cpu_active;
203	atomic_inc(&cpu->nrdy);	204	atomic_inc(&cpu->nrdy);
204		205
205	interrupts_restore(ipl);	206	interrupts_restore(ipl);
206	}	207	}
207		208
208		209
209	/** Destroy thread memory structure	210	/** Destroy thread memory structure
210	*	211	*
211	* Detach thread from all queues, cpus etc. and destroy it.	212	* Detach thread from all queues, cpus etc. and destroy it.
212	*	213	*
213	* Assume thread->lock is held!!	214	* Assume thread->lock is held!!
214	*/	215	*/
215	void thread_destroy(thread_t *t)	216	void thread_destroy(thread_t *t)
216	{	217	{
217	ASSERT(t->state == Exiting);	218	ASSERT(t->state == Exiting);
218	ASSERT(t->task);	219	ASSERT(t->task);
219	ASSERT(t->cpu);	220	ASSERT(t->cpu);
220		221
221	spinlock_lock(&t->cpu->lock);	222	spinlock_lock(&t->cpu->lock);
222	if(t->cpu->fpu_owner==t)	223	if(t->cpu->fpu_owner==t)
223	t->cpu->fpu_owner=NULL;	224	t->cpu->fpu_owner=NULL;
224	spinlock_unlock(&t->cpu->lock);	225	spinlock_unlock(&t->cpu->lock);
225		226
226	/*	227	/*
227	* Detach from the containing task.	228	* Detach from the containing task.
228	*/	229	*/
229	spinlock_lock(&t->task->lock);	230	spinlock_lock(&t->task->lock);
230	list_remove(&t->th_link);	231	list_remove(&t->th_link);
231	spinlock_unlock(&t->task->lock);	232	spinlock_unlock(&t->task->lock);
232		233
233	spinlock_unlock(&t->lock);	234	spinlock_unlock(&t->lock);
234		235
235	spinlock_lock(&threads_lock);	236	spinlock_lock(&threads_lock);
236	list_remove(&t->threads_link);	237	list_remove(&t->threads_link);
237	spinlock_unlock(&threads_lock);	238	spinlock_unlock(&threads_lock);
238		239
239	slab_free(thread_slab, t);	240	slab_free(thread_slab, t);
240	}	241	}
241		242
242		243
243	/** Create new thread	244	/** Create new thread
244	*	245	*
245	* Create a new thread.	246	* Create a new thread.
246	*	247	*
247	* @param func Thread's implementing function.	248	* @param func Thread's implementing function.
248	* @param arg Thread's implementing function argument.	249	* @param arg Thread's implementing function argument.
249	* @param task Task to which the thread belongs.	250	* @param task Task to which the thread belongs.
250	* @param flags Thread flags.	251	* @param flags Thread flags.
251	* @param name Symbolic name.	252	* @param name Symbolic name.
252	*	253	*
253	* @return New thread's structure on success, NULL on failure.	254	* @return New thread's structure on success, NULL on failure.
254	*	255	*
255	*/	256	*/
256	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)	257	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)
257	{	258	{
258	thread_t *t;	259	thread_t *t;
259	ipl_t ipl;	260	ipl_t ipl;
260		261
261	t = (thread_t *) slab_alloc(thread_slab, 0);	262	t = (thread_t *) slab_alloc(thread_slab, 0);
262	if (!t)	263	if (!t)
263	return NULL;	264	return NULL;
264		265
265	/* Not needed, but good for debugging */	266	/* Not needed, but good for debugging */
266	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	267	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
267		268
268	ipl = interrupts_disable();	269	ipl = interrupts_disable();
269	spinlock_lock(&tidlock);	270	spinlock_lock(&tidlock);
270	t->tid = ++last_tid;	271	t->tid = ++last_tid;
271	spinlock_unlock(&tidlock);	272	spinlock_unlock(&tidlock);
272	interrupts_restore(ipl);	273	interrupts_restore(ipl);
273		274
274	context_save(&t->saved_context);	275	context_save(&t->saved_context);
275	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	276	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
276		277
277	the_initialize((the_t *) t->kstack);	278	the_initialize((the_t *) t->kstack);
278		279
279	ipl = interrupts_disable();	280	ipl = interrupts_disable();
280	t->saved_context.ipl = interrupts_read();	281	t->saved_context.ipl = interrupts_read();
281	interrupts_restore(ipl);	282	interrupts_restore(ipl);
282		283
283	t->name = name;	284	memcpy(t->name, name, THREAD_NAME_BUFLEN);
-		285
284	t->thread_code = func;	286	t->thread_code = func;
285	t->thread_arg = arg;	287	t->thread_arg = arg;
286	t->ticks = -1;	288	t->ticks = -1;
287	t->priority = -1; /* start in rq[0] */	289	t->priority = -1; /* start in rq[0] */
288	t->cpu = NULL;	290	t->cpu = NULL;
289	t->flags = 0;	291	t->flags = 0;
290	t->state = Entering;	292	t->state = Entering;
291	t->call_me = NULL;	293	t->call_me = NULL;
292	t->call_me_with = NULL;	294	t->call_me_with = NULL;
293		295
294	timeout_initialize(&t->sleep_timeout);	296	timeout_initialize(&t->sleep_timeout);
295	t->sleep_queue = NULL;	297	t->sleep_queue = NULL;
296	t->timeout_pending = 0;	298	t->timeout_pending = 0;
297		299
298	t->rwlock_holder_type = RWLOCK_NONE;	300	t->rwlock_holder_type = RWLOCK_NONE;
299		301
300	t->task = task;	302	t->task = task;
301		303
302	t->fpu_context_exists = 0;	304	t->fpu_context_exists = 0;
303	t->fpu_context_engaged = 0;	305	t->fpu_context_engaged = 0;
304		306
305	/*	307	/*
306	* Register this thread in the system-wide list.	308	* Register this thread in the system-wide list.
307	*/	309	*/
308	ipl = interrupts_disable();	310	ipl = interrupts_disable();
309	spinlock_lock(&threads_lock);	311	spinlock_lock(&threads_lock);
310	list_append(&t->threads_link, &threads_head);	312	list_append(&t->threads_link, &threads_head);
311	spinlock_unlock(&threads_lock);	313	spinlock_unlock(&threads_lock);
312		314
313	/*	315	/*
314	* Attach to the containing task.	316	* Attach to the containing task.
315	*/	317	*/
316	spinlock_lock(&task->lock);	318	spinlock_lock(&task->lock);
317	list_append(&t->th_link, &task->th_head);	319	list_append(&t->th_link, &task->th_head);
318	spinlock_unlock(&task->lock);	320	spinlock_unlock(&task->lock);
319		321
320	interrupts_restore(ipl);	322	interrupts_restore(ipl);
321		323
322	return t;	324	return t;
323	}	325	}
324		326
325		327
326	/** Make thread exiting	328	/** Make thread exiting
327	*	329	*
328	* End current thread execution and switch it to the exiting	330	* End current thread execution and switch it to the exiting
329	* state. All pending timeouts are executed.	331	* state. All pending timeouts are executed.
330	*	332	*
331	*/	333	*/
332	void thread_exit(void)	334	void thread_exit(void)
333	{	335	{
334	ipl_t ipl;	336	ipl_t ipl;
335		337
336	restart:	338	restart:
337	ipl = interrupts_disable();	339	ipl = interrupts_disable();
338	spinlock_lock(&THREAD->lock);	340	spinlock_lock(&THREAD->lock);
339	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	341	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
340	spinlock_unlock(&THREAD->lock);	342	spinlock_unlock(&THREAD->lock);
341	interrupts_restore(ipl);	343	interrupts_restore(ipl);
342	goto restart;	344	goto restart;
343	}	345	}
344	THREAD->state = Exiting;	346	THREAD->state = Exiting;
345	spinlock_unlock(&THREAD->lock);	347	spinlock_unlock(&THREAD->lock);
346	scheduler();	348	scheduler();
347	}	349	}
348		350
349		351
350	/** Thread sleep	352	/** Thread sleep
351	*	353	*
352	* Suspend execution of the current thread.	354	* Suspend execution of the current thread.
353	*	355	*
354	* @param sec Number of seconds to sleep.	356	* @param sec Number of seconds to sleep.
355	*	357	*
356	*/	358	*/
357	void thread_sleep(__u32 sec)	359	void thread_sleep(__u32 sec)
358	{	360	{
359	thread_usleep(sec*1000000);	361	thread_usleep(sec*1000000);
360	}	362	}
361		363
362		364
363	/** Thread usleep	365	/** Thread usleep
364	*	366	*
365	* Suspend execution of the current thread.	367	* Suspend execution of the current thread.
366	*	368	*
367	* @param usec Number of microseconds to sleep.	369	* @param usec Number of microseconds to sleep.
368	*	370	*
369	*/	371	*/
370	void thread_usleep(__u32 usec)	372	void thread_usleep(__u32 usec)
371	{	373	{
372	waitq_t wq;	374	waitq_t wq;
373		375
374	waitq_initialize(&wq);	376	waitq_initialize(&wq);
375		377
376	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	378	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
377	}	379	}
378		380
379		381
380	/** Register thread out-of-context invocation	382	/** Register thread out-of-context invocation
381	*	383	*
382	* Register a function and its argument to be executed	384	* Register a function and its argument to be executed
383	* on next context switch to the current thread.	385	* on next context switch to the current thread.
384	*	386	*
385	* @param call_me Out-of-context function.	387	* @param call_me Out-of-context function.
386	* @param call_me_with Out-of-context function argument.	388	* @param call_me_with Out-of-context function argument.
387	*	389	*
388	*/	390	*/
389	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	391	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
390	{	392	{
391	ipl_t ipl;	393	ipl_t ipl;
392		394
393	ipl = interrupts_disable();	395	ipl = interrupts_disable();
394	spinlock_lock(&THREAD->lock);	396	spinlock_lock(&THREAD->lock);
395	THREAD->call_me = call_me;	397	THREAD->call_me = call_me;
396	THREAD->call_me_with = call_me_with;	398	THREAD->call_me_with = call_me_with;
397	spinlock_unlock(&THREAD->lock);	399	spinlock_unlock(&THREAD->lock);
398	interrupts_restore(ipl);	400	interrupts_restore(ipl);
399	}	401	}
400		402
401	/** Print list of threads debug info */	403	/** Print list of threads debug info */
402	void thread_print_list(void)	404	void thread_print_list(void)
403	{	405	{
404	link_t *cur;	406	link_t *cur;
405	thread_t *t;	407	thread_t *t;
406	ipl_t ipl;	408	ipl_t ipl;
407		409
408	/* Messing with thread structures, avoid deadlock */	410	/* Messing with thread structures, avoid deadlock */
409	ipl = interrupts_disable();	411	ipl = interrupts_disable();
410	spinlock_lock(&threads_lock);	412	spinlock_lock(&threads_lock);
411		413
412	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	414	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
413	t = list_get_instance(cur, thread_t, threads_link);	415	t = list_get_instance(cur, thread_t, threads_link);
414	printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",	416	printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
415	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);	417	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
416	if (t->cpu)	418	if (t->cpu)
417	printf("cpu%d ", t->cpu->id);	419	printf("cpu%d ", t->cpu->id);
418	else	420	else
419	printf("none");	421	printf("none");
420	printf("\n");	422	printf("\n");
421	}	423	}
422		424
423	spinlock_unlock(&threads_lock);	425	spinlock_unlock(&threads_lock);
424	interrupts_restore(ipl);	426	interrupts_restore(ipl);
425	}	427	}
-		428
-		429	/** Process syscall to create new thread.
-		430	*
-		431	*/
-		432	__native sys_thread_create(__address function, void arg, void stack, char *name)
-		433	{
-		434	thread_t *t;
-		435	char namebuf[THREAD_NAME_BUFLEN];
-		436	uspace_arg_t *uarg;
-		437	__u32 tid;
-		438
-		439	copy_from_uspace(namebuf, name, THREAD_NAME_BUFLEN);
-		440	uarg = (uspace_arg_t *) malloc(sizeof(uarg), 0);
-		441
-		442	uarg->uspace_entry = function;
-		443	uarg->uspace_stack = (__address) stack;
-		444
-		445	if ((t = thread_create(uinit, uarg, TASK, 0, namebuf))) {
-		446	tid = t->tid;
-		447	thread_ready(t);
-		448	return (__native) tid;
-		449	} else {
-		450	free(namebuf);
-		451	}
-		452
-		453	return (__native) -1;
-		454	}
-		455
-		456	/** Process syscall to terminate thread.
-		457	*
-		458	*/
-		459	__native sys_thread_exit(int status)
-		460	{
-		461	thread_exit();
-		462	/* Unreachable */
-		463	return 0;
-		464	}
426		465

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(root)/branches/sparc/kernel/generic/src/proc/thread.c @ 3745 – Rev 1062 → 1066