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 <proc/uarg.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);
 
    ASSERT(! (t->state == Ready));
 
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
   
    cpu = CPU;
    if (t->flags & X_WIRED) {
        cpu = t->cpu;
    }
    t->state = Ready;
    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\n\ttask=%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(uspace_arg_t *uspace_uarg, char *uspace_name)
{
        thread_t *t;
        char namebuf[THREAD_NAME_BUFLEN];
    uspace_arg_t *kernel_uarg;      /* TODO: store kernel_uarg in thread_t */
    __u32 tid;
 
        copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
 
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
    copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
 
        if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
        tid = t->tid;
                thread_ready(t);
        return (__native) tid;
        } else {
        free(kernel_uarg);
        }
 
        return (__native) -1;
}
 
/** Process syscall to terminate thread.
 *
 */
__native sys_thread_exit(int uspace_status)
{
        thread_exit();
        /* Unreachable */
        return 0;
}
 

Rev 1083	Rev 1086
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 <proc/uarg.h>	32	#include <proc/uarg.h>
33	#include <mm/frame.h>	33	#include <mm/frame.h>
34	#include <mm/page.h>	34	#include <mm/page.h>
35	#include <arch/asm.h>	35	#include <arch/asm.h>
36	#include <arch.h>	36	#include <arch.h>
37	#include <synch/synch.h>	37	#include <synch/synch.h>
38	#include <synch/spinlock.h>	38	#include <synch/spinlock.h>
39	#include <synch/waitq.h>	39	#include <synch/waitq.h>
40	#include <synch/rwlock.h>	40	#include <synch/rwlock.h>
41	#include <cpu.h>	41	#include <cpu.h>
42	#include <func.h>	42	#include <func.h>
43	#include <context.h>	43	#include <context.h>
44	#include <adt/list.h>	44	#include <adt/list.h>
45	#include <typedefs.h>	45	#include <typedefs.h>
46	#include <time/clock.h>	46	#include <time/clock.h>
47	#include <adt/list.h>	47	#include <adt/list.h>
48	#include <config.h>	48	#include <config.h>
49	#include <arch/interrupt.h>	49	#include <arch/interrupt.h>
50	#include <smp/ipi.h>	50	#include <smp/ipi.h>
51	#include <arch/faddr.h>	51	#include <arch/faddr.h>
52	#include <arch/atomic.h>	52	#include <arch/atomic.h>
53	#include <memstr.h>	53	#include <memstr.h>
54	#include <print.h>	54	#include <print.h>
55	#include <mm/slab.h>	55	#include <mm/slab.h>
56	#include <debug.h>	56	#include <debug.h>
57	#include <main/uinit.h>	57	#include <main/uinit.h>
58		58
59	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	59	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
60		60
61	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /	61	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /
62	LIST_INITIALIZE(threads_head); /*< List of all threads. /	62	LIST_INITIALIZE(threads_head); /*< List of all threads. /
63		63
64	SPINLOCK_INITIALIZE(tidlock);	64	SPINLOCK_INITIALIZE(tidlock);
65	__u32 last_tid = 0;	65	__u32 last_tid = 0;
66		66
67	static slab_cache_t *thread_slab;	67	static slab_cache_t *thread_slab;
68	#ifdef ARCH_HAS_FPU	68	#ifdef ARCH_HAS_FPU
69	slab_cache_t *fpu_context_slab;	69	slab_cache_t *fpu_context_slab;
70	#endif	70	#endif
71		71
72		72
73	/** Thread wrapper	73	/** Thread wrapper
74	*	74	*
75	* This wrapper is provided to ensure that every thread	75	* This wrapper is provided to ensure that every thread
76	* makes a call to thread_exit() when its implementing	76	* makes a call to thread_exit() when its implementing
77	* function returns.	77	* function returns.
78	*	78	*
79	* interrupts_disable() is assumed.	79	* interrupts_disable() is assumed.
80	*	80	*
81	*/	81	*/
82	static void cushion(void)	82	static void cushion(void)
83	{	83	{
84	void (f)(void ) = THREAD->thread_code;	84	void (f)(void ) = THREAD->thread_code;
85	void *arg = THREAD->thread_arg;	85	void *arg = THREAD->thread_arg;
86		86
87	/* this is where each thread wakes up after its creation */	87	/* this is where each thread wakes up after its creation */
88	before_thread_runs();	88	before_thread_runs();
89		89
90	spinlock_unlock(&THREAD->lock);	90	spinlock_unlock(&THREAD->lock);
91	interrupts_enable();	91	interrupts_enable();
92		92
93	f(arg);	93	f(arg);
94	thread_exit();	94	thread_exit();
95	/* not reached */	95	/* not reached */
96	}	96	}
97		97
98	/** Initialization and allocation for thread_t structure */	98	/** Initialization and allocation for thread_t structure */
99	static int thr_constructor(void *obj, int kmflags)	99	static int thr_constructor(void *obj, int kmflags)
100	{	100	{
101	thread_t t = (thread_t )obj;	101	thread_t t = (thread_t )obj;
102	pfn_t pfn;	102	pfn_t pfn;
103	int status;	103	int status;
104		104
105	spinlock_initialize(&t->lock, "thread_t_lock");	105	spinlock_initialize(&t->lock, "thread_t_lock");
106	link_initialize(&t->rq_link);	106	link_initialize(&t->rq_link);
107	link_initialize(&t->wq_link);	107	link_initialize(&t->wq_link);
108	link_initialize(&t->th_link);	108	link_initialize(&t->th_link);
109	link_initialize(&t->threads_link);	109	link_initialize(&t->threads_link);
110		110
111	#ifdef ARCH_HAS_FPU	111	#ifdef ARCH_HAS_FPU
112	# ifdef CONFIG_FPU_LAZY	112	# ifdef CONFIG_FPU_LAZY
113	t->saved_fpu_context = NULL;	113	t->saved_fpu_context = NULL;
114	# else	114	# else
115	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	115	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
116	if (!t->saved_fpu_context)	116	if (!t->saved_fpu_context)
117	return -1;	117	return -1;
118	# endif	118	# endif
119	#endif	119	#endif
120		120
121	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	121	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
122	if (status) {	122	if (status) {
123	#ifdef ARCH_HAS_FPU	123	#ifdef ARCH_HAS_FPU
124	if (t->saved_fpu_context)	124	if (t->saved_fpu_context)
125	slab_free(fpu_context_slab,t->saved_fpu_context);	125	slab_free(fpu_context_slab,t->saved_fpu_context);
126	#endif	126	#endif
127	return -1;	127	return -1;
128	}	128	}
129	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	129	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
130		130
131	return 0;	131	return 0;
132	}	132	}
133		133
134	/** Destruction of thread_t object */	134	/** Destruction of thread_t object */
135	static int thr_destructor(void *obj)	135	static int thr_destructor(void *obj)
136	{	136	{
137	thread_t t = (thread_t )obj;	137	thread_t t = (thread_t )obj;
138		138
139	frame_free(ADDR2PFN(KA2PA(t->kstack)));	139	frame_free(ADDR2PFN(KA2PA(t->kstack)));
140	#ifdef ARCH_HAS_FPU	140	#ifdef ARCH_HAS_FPU
141	if (t->saved_fpu_context)	141	if (t->saved_fpu_context)
142	slab_free(fpu_context_slab,t->saved_fpu_context);	142	slab_free(fpu_context_slab,t->saved_fpu_context);
143	#endif	143	#endif
144	return 1; /* One page freed */	144	return 1; /* One page freed */
145	}	145	}
146		146
147	/** Initialize threads	147	/** Initialize threads
148	*	148	*
149	* Initialize kernel threads support.	149	* Initialize kernel threads support.
150	*	150	*
151	*/	151	*/
152	void thread_init(void)	152	void thread_init(void)
153	{	153	{
154	THREAD = NULL;	154	THREAD = NULL;
155	atomic_set(&nrdy,0);	155	atomic_set(&nrdy,0);
156	thread_slab = slab_cache_create("thread_slab",	156	thread_slab = slab_cache_create("thread_slab",
157	sizeof(thread_t),0,	157	sizeof(thread_t),0,
158	thr_constructor, thr_destructor, 0);	158	thr_constructor, thr_destructor, 0);
159	#ifdef ARCH_HAS_FPU	159	#ifdef ARCH_HAS_FPU
160	fpu_context_slab = slab_cache_create("fpu_slab",	160	fpu_context_slab = slab_cache_create("fpu_slab",
161	sizeof(fpu_context_t),	161	sizeof(fpu_context_t),
162	FPU_CONTEXT_ALIGN,	162	FPU_CONTEXT_ALIGN,
163	NULL, NULL, 0);	163	NULL, NULL, 0);
164	#endif	164	#endif
165	}	165	}
166		166
167		167
168	/** Make thread ready	168	/** Make thread ready
169	*	169	*
170	* Switch thread t to the ready state.	170	* Switch thread t to the ready state.
171	*	171	*
172	* @param t Thread to make ready.	172	* @param t Thread to make ready.
173	*	173	*
174	*/	174	*/
175	void thread_ready(thread_t *t)	175	void thread_ready(thread_t *t)
176	{	176	{
177	cpu_t *cpu;	177	cpu_t *cpu;
178	runq_t *r;	178	runq_t *r;
179	ipl_t ipl;	179	ipl_t ipl;
180	int i, avg;	180	int i, avg;
181		181
182	ipl = interrupts_disable();	182	ipl = interrupts_disable();
183		183
184	spinlock_lock(&t->lock);	184	spinlock_lock(&t->lock);
185		185
-		186	ASSERT(! (t->state == Ready));
-		187
186	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	188	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
187		189
188	cpu = CPU;	190	cpu = CPU;
189	if (t->flags & X_WIRED) {	191	if (t->flags & X_WIRED) {
190	cpu = t->cpu;	192	cpu = t->cpu;
191	}	193	}
192	t->state = Ready;	194	t->state = Ready;
193	spinlock_unlock(&t->lock);	195	spinlock_unlock(&t->lock);
194		196
195	/*	197	/*
196	* Append t to respective ready queue on respective processor.	198	* Append t to respective ready queue on respective processor.
197	*/	199	*/
198	r = &cpu->rq[i];	200	r = &cpu->rq[i];
199	spinlock_lock(&r->lock);	201	spinlock_lock(&r->lock);
200	list_append(&t->rq_link, &r->rq_head);	202	list_append(&t->rq_link, &r->rq_head);
201	r->n++;	203	r->n++;
202	spinlock_unlock(&r->lock);	204	spinlock_unlock(&r->lock);
203		205
204	atomic_inc(&nrdy);	206	atomic_inc(&nrdy);
205	avg = atomic_get(&nrdy) / config.cpu_active;	207	avg = atomic_get(&nrdy) / config.cpu_active;
206	atomic_inc(&cpu->nrdy);	208	atomic_inc(&cpu->nrdy);
207		209
208	interrupts_restore(ipl);	210	interrupts_restore(ipl);
209	}	211	}
210		212
211		213
212	/** Destroy thread memory structure	214	/** Destroy thread memory structure
213	*	215	*
214	* Detach thread from all queues, cpus etc. and destroy it.	216	* Detach thread from all queues, cpus etc. and destroy it.
215	*	217	*
216	* Assume thread->lock is held!!	218	* Assume thread->lock is held!!
217	*/	219	*/
218	void thread_destroy(thread_t *t)	220	void thread_destroy(thread_t *t)
219	{	221	{
220	ASSERT(t->state == Exiting);	222	ASSERT(t->state == Exiting);
221	ASSERT(t->task);	223	ASSERT(t->task);
222	ASSERT(t->cpu);	224	ASSERT(t->cpu);
223		225
224	spinlock_lock(&t->cpu->lock);	226	spinlock_lock(&t->cpu->lock);
225	if(t->cpu->fpu_owner==t)	227	if(t->cpu->fpu_owner==t)
226	t->cpu->fpu_owner=NULL;	228	t->cpu->fpu_owner=NULL;
227	spinlock_unlock(&t->cpu->lock);	229	spinlock_unlock(&t->cpu->lock);
228		230
229	/*	231	/*
230	* Detach from the containing task.	232	* Detach from the containing task.
231	*/	233	*/
232	spinlock_lock(&t->task->lock);	234	spinlock_lock(&t->task->lock);
233	list_remove(&t->th_link);	235	list_remove(&t->th_link);
234	spinlock_unlock(&t->task->lock);	236	spinlock_unlock(&t->task->lock);
235		237
236	spinlock_unlock(&t->lock);	238	spinlock_unlock(&t->lock);
237		239
238	spinlock_lock(&threads_lock);	240	spinlock_lock(&threads_lock);
239	list_remove(&t->threads_link);	241	list_remove(&t->threads_link);
240	spinlock_unlock(&threads_lock);	242	spinlock_unlock(&threads_lock);
241		243
242	slab_free(thread_slab, t);	244	slab_free(thread_slab, t);
243	}	245	}
244		246
245		247
246	/** Create new thread	248	/** Create new thread
247	*	249	*
248	* Create a new thread.	250	* Create a new thread.
249	*	251	*
250	* @param func Thread's implementing function.	252	* @param func Thread's implementing function.
251	* @param arg Thread's implementing function argument.	253	* @param arg Thread's implementing function argument.
252	* @param task Task to which the thread belongs.	254	* @param task Task to which the thread belongs.
253	* @param flags Thread flags.	255	* @param flags Thread flags.
254	* @param name Symbolic name.	256	* @param name Symbolic name.
255	*	257	*
256	* @return New thread's structure on success, NULL on failure.	258	* @return New thread's structure on success, NULL on failure.
257	*	259	*
258	*/	260	*/
259	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)	261	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)
260	{	262	{
261	thread_t *t;	263	thread_t *t;
262	ipl_t ipl;	264	ipl_t ipl;
263		265
264	t = (thread_t *) slab_alloc(thread_slab, 0);	266	t = (thread_t *) slab_alloc(thread_slab, 0);
265	if (!t)	267	if (!t)
266	return NULL;	268	return NULL;
267		269
268	/* Not needed, but good for debugging */	270	/* Not needed, but good for debugging */
269	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	271	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
270		272
271	ipl = interrupts_disable();	273	ipl = interrupts_disable();
272	spinlock_lock(&tidlock);	274	spinlock_lock(&tidlock);
273	t->tid = ++last_tid;	275	t->tid = ++last_tid;
274	spinlock_unlock(&tidlock);	276	spinlock_unlock(&tidlock);
275	interrupts_restore(ipl);	277	interrupts_restore(ipl);
276		278
277	context_save(&t->saved_context);	279	context_save(&t->saved_context);
278	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	280	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
279		281
280	the_initialize((the_t *) t->kstack);	282	the_initialize((the_t *) t->kstack);
281		283
282	ipl = interrupts_disable();	284	ipl = interrupts_disable();
283	t->saved_context.ipl = interrupts_read();	285	t->saved_context.ipl = interrupts_read();
284	interrupts_restore(ipl);	286	interrupts_restore(ipl);
285		287
286	memcpy(t->name, name, THREAD_NAME_BUFLEN);	288	memcpy(t->name, name, THREAD_NAME_BUFLEN);
287		289
288	t->thread_code = func;	290	t->thread_code = func;
289	t->thread_arg = arg;	291	t->thread_arg = arg;
290	t->ticks = -1;	292	t->ticks = -1;
291	t->priority = -1; /* start in rq[0] */	293	t->priority = -1; /* start in rq[0] */
292	t->cpu = NULL;	294	t->cpu = NULL;
293	t->flags = 0;	295	t->flags = 0;
294	t->state = Entering;	296	t->state = Entering;
295	t->call_me = NULL;	297	t->call_me = NULL;
296	t->call_me_with = NULL;	298	t->call_me_with = NULL;
297		299
298	timeout_initialize(&t->sleep_timeout);	300	timeout_initialize(&t->sleep_timeout);
299	t->sleep_queue = NULL;	301	t->sleep_queue = NULL;
300	t->timeout_pending = 0;	302	t->timeout_pending = 0;
301		303
302	t->rwlock_holder_type = RWLOCK_NONE;	304	t->rwlock_holder_type = RWLOCK_NONE;
303		305
304	t->task = task;	306	t->task = task;
305		307
306	t->fpu_context_exists = 0;	308	t->fpu_context_exists = 0;
307	t->fpu_context_engaged = 0;	309	t->fpu_context_engaged = 0;
308		310
309	/*	311	/*
310	* Register this thread in the system-wide list.	312	* Register this thread in the system-wide list.
311	*/	313	*/
312	ipl = interrupts_disable();	314	ipl = interrupts_disable();
313	spinlock_lock(&threads_lock);	315	spinlock_lock(&threads_lock);
314	list_append(&t->threads_link, &threads_head);	316	list_append(&t->threads_link, &threads_head);
315	spinlock_unlock(&threads_lock);	317	spinlock_unlock(&threads_lock);
316		318
317	/*	319	/*
318	* Attach to the containing task.	320	* Attach to the containing task.
319	*/	321	*/
320	spinlock_lock(&task->lock);	322	spinlock_lock(&task->lock);
321	list_append(&t->th_link, &task->th_head);	323	list_append(&t->th_link, &task->th_head);
322	spinlock_unlock(&task->lock);	324	spinlock_unlock(&task->lock);
323		325
324	interrupts_restore(ipl);	326	interrupts_restore(ipl);
325		327
326	return t;	328	return t;
327	}	329	}
328		330
329		331
330	/** Make thread exiting	332	/** Make thread exiting
331	*	333	*
332	* End current thread execution and switch it to the exiting	334	* End current thread execution and switch it to the exiting
333	* state. All pending timeouts are executed.	335	* state. All pending timeouts are executed.
334	*	336	*
335	*/	337	*/
336	void thread_exit(void)	338	void thread_exit(void)
337	{	339	{
338	ipl_t ipl;	340	ipl_t ipl;
339		341
340	restart:	342	restart:
341	ipl = interrupts_disable();	343	ipl = interrupts_disable();
342	spinlock_lock(&THREAD->lock);	344	spinlock_lock(&THREAD->lock);
343	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	345	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
344	spinlock_unlock(&THREAD->lock);	346	spinlock_unlock(&THREAD->lock);
345	interrupts_restore(ipl);	347	interrupts_restore(ipl);
346	goto restart;	348	goto restart;
347	}	349	}
348	THREAD->state = Exiting;	350	THREAD->state = Exiting;
349	spinlock_unlock(&THREAD->lock);	351	spinlock_unlock(&THREAD->lock);
350	scheduler();	352	scheduler();
351	}	353	}
352		354
353		355
354	/** Thread sleep	356	/** Thread sleep
355	*	357	*
356	* Suspend execution of the current thread.	358	* Suspend execution of the current thread.
357	*	359	*
358	* @param sec Number of seconds to sleep.	360	* @param sec Number of seconds to sleep.
359	*	361	*
360	*/	362	*/
361	void thread_sleep(__u32 sec)	363	void thread_sleep(__u32 sec)
362	{	364	{
363	thread_usleep(sec*1000000);	365	thread_usleep(sec*1000000);
364	}	366	}
365		367
366		368
367	/** Thread usleep	369	/** Thread usleep
368	*	370	*
369	* Suspend execution of the current thread.	371	* Suspend execution of the current thread.
370	*	372	*
371	* @param usec Number of microseconds to sleep.	373	* @param usec Number of microseconds to sleep.
372	*	374	*
373	*/	375	*/
374	void thread_usleep(__u32 usec)	376	void thread_usleep(__u32 usec)
375	{	377	{
376	waitq_t wq;	378	waitq_t wq;
377		379
378	waitq_initialize(&wq);	380	waitq_initialize(&wq);
379		381
380	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	382	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
381	}	383	}
382		384
383		385
384	/** Register thread out-of-context invocation	386	/** Register thread out-of-context invocation
385	*	387	*
386	* Register a function and its argument to be executed	388	* Register a function and its argument to be executed
387	* on next context switch to the current thread.	389	* on next context switch to the current thread.
388	*	390	*
389	* @param call_me Out-of-context function.	391	* @param call_me Out-of-context function.
390	* @param call_me_with Out-of-context function argument.	392	* @param call_me_with Out-of-context function argument.
391	*	393	*
392	*/	394	*/
393	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	395	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
394	{	396	{
395	ipl_t ipl;	397	ipl_t ipl;
396		398
397	ipl = interrupts_disable();	399	ipl = interrupts_disable();
398	spinlock_lock(&THREAD->lock);	400	spinlock_lock(&THREAD->lock);
399	THREAD->call_me = call_me;	401	THREAD->call_me = call_me;
400	THREAD->call_me_with = call_me_with;	402	THREAD->call_me_with = call_me_with;
401	spinlock_unlock(&THREAD->lock);	403	spinlock_unlock(&THREAD->lock);
402	interrupts_restore(ipl);	404	interrupts_restore(ipl);
403	}	405	}
404		406
405	/** Print list of threads debug info */	407	/** Print list of threads debug info */
406	void thread_print_list(void)	408	void thread_print_list(void)
407	{	409	{
408	link_t *cur;	410	link_t *cur;
409	thread_t *t;	411	thread_t *t;
410	ipl_t ipl;	412	ipl_t ipl;
411		413
412	/* Messing with thread structures, avoid deadlock */	414	/* Messing with thread structures, avoid deadlock */
413	ipl = interrupts_disable();	415	ipl = interrupts_disable();
414	spinlock_lock(&threads_lock);	416	spinlock_lock(&threads_lock);
415		417
416	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	418	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
417	t = list_get_instance(cur, thread_t, threads_link);	419	t = list_get_instance(cur, thread_t, threads_link);
418	printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",	420	printf("%s: address=%P, tid=%d, state=%s\n\ttask=%P, code=%P, stack=%P, cpu=",
419	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);	421	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
420	if (t->cpu)	422	if (t->cpu)
421	printf("cpu%d ", t->cpu->id);	423	printf("cpu%d ", t->cpu->id);
422	else	424	else
423	printf("none");	425	printf("none");
424	printf("\n");	426	printf("\n");
425	}	427	}
426		428
427	spinlock_unlock(&threads_lock);	429	spinlock_unlock(&threads_lock);
428	interrupts_restore(ipl);	430	interrupts_restore(ipl);
429	}	431	}
430		432
431	/** Process syscall to create new thread.	433	/** Process syscall to create new thread.
432	*	434	*
433	*/	435	*/
434	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)	436	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)
435	{	437	{
436	thread_t *t;	438	thread_t *t;
437	char namebuf[THREAD_NAME_BUFLEN];	439	char namebuf[THREAD_NAME_BUFLEN];
438	uspace_arg_t kernel_uarg; / TODO: store kernel_uarg in thread_t */	440	uspace_arg_t kernel_uarg; / TODO: store kernel_uarg in thread_t */
439	__u32 tid;	441	__u32 tid;
440		442
441	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);	443	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
442		444
443	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	445	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
444	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));	446	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
445		447
446	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {	448	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
447	tid = t->tid;	449	tid = t->tid;
448	thread_ready(t);	450	thread_ready(t);
449	return (__native) tid;	451	return (__native) tid;
450	} else {	452	} else {
451	free(kernel_uarg);	453	free(kernel_uarg);
452	}	454	}
453		455
454	return (__native) -1;	456	return (__native) -1;
455	}	457	}
456		458
457	/** Process syscall to terminate thread.	459	/** Process syscall to terminate thread.
458	*	460	*
459	*/	461	*/
460	__native sys_thread_exit(int uspace_status)	462	__native sys_thread_exit(int uspace_status)
461	{	463	{
462	thread_exit();	464	thread_exit();
463	/* Unreachable */	465	/* Unreachable */
464	return 0;	466	return 0;
465	}	467	}
466		468

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/proc/thread.c @ 1780 – Rev 1083 → 1086