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 */
 
 
    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;
    __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 1086	Rev 1103
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();	-
89		-
90	spinlock_unlock(&THREAD->lock);	88	spinlock_unlock(&THREAD->lock);
91	interrupts_enable();	89	interrupts_enable();
92		90
93	f(arg);	91	f(arg);
94	thread_exit();	92	thread_exit();
95	/* not reached */	93	/* not reached */
96	}	94	}
97		95
98	/** Initialization and allocation for thread_t structure */	96	/** Initialization and allocation for thread_t structure */
99	static int thr_constructor(void *obj, int kmflags)	97	static int thr_constructor(void *obj, int kmflags)
100	{	98	{
101	thread_t t = (thread_t )obj;	99	thread_t t = (thread_t )obj;
102	pfn_t pfn;	100	pfn_t pfn;
103	int status;	101	int status;
104		102
105	spinlock_initialize(&t->lock, "thread_t_lock");	103	spinlock_initialize(&t->lock, "thread_t_lock");
106	link_initialize(&t->rq_link);	104	link_initialize(&t->rq_link);
107	link_initialize(&t->wq_link);	105	link_initialize(&t->wq_link);
108	link_initialize(&t->th_link);	106	link_initialize(&t->th_link);
109	link_initialize(&t->threads_link);	107	link_initialize(&t->threads_link);
110		108
111	#ifdef ARCH_HAS_FPU	109	#ifdef ARCH_HAS_FPU
112	# ifdef CONFIG_FPU_LAZY	110	# ifdef CONFIG_FPU_LAZY
113	t->saved_fpu_context = NULL;	111	t->saved_fpu_context = NULL;
114	# else	112	# else
115	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	113	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
116	if (!t->saved_fpu_context)	114	if (!t->saved_fpu_context)
117	return -1;	115	return -1;
118	# endif	116	# endif
119	#endif	117	#endif
120		118
121	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	119	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
122	if (status) {	120	if (status) {
123	#ifdef ARCH_HAS_FPU	121	#ifdef ARCH_HAS_FPU
124	if (t->saved_fpu_context)	122	if (t->saved_fpu_context)
125	slab_free(fpu_context_slab,t->saved_fpu_context);	123	slab_free(fpu_context_slab,t->saved_fpu_context);
126	#endif	124	#endif
127	return -1;	125	return -1;
128	}	126	}
129	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	127	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
130		128
131	return 0;	129	return 0;
132	}	130	}
133		131
134	/** Destruction of thread_t object */	132	/** Destruction of thread_t object */
135	static int thr_destructor(void *obj)	133	static int thr_destructor(void *obj)
136	{	134	{
137	thread_t t = (thread_t )obj;	135	thread_t t = (thread_t )obj;
138		136
139	frame_free(ADDR2PFN(KA2PA(t->kstack)));	137	frame_free(ADDR2PFN(KA2PA(t->kstack)));
140	#ifdef ARCH_HAS_FPU	138	#ifdef ARCH_HAS_FPU
141	if (t->saved_fpu_context)	139	if (t->saved_fpu_context)
142	slab_free(fpu_context_slab,t->saved_fpu_context);	140	slab_free(fpu_context_slab,t->saved_fpu_context);
143	#endif	141	#endif
144	return 1; /* One page freed */	142	return 1; /* One page freed */
145	}	143	}
146		144
147	/** Initialize threads	145	/** Initialize threads
148	*	146	*
149	* Initialize kernel threads support.	147	* Initialize kernel threads support.
150	*	148	*
151	*/	149	*/
152	void thread_init(void)	150	void thread_init(void)
153	{	151	{
154	THREAD = NULL;	152	THREAD = NULL;
155	atomic_set(&nrdy,0);	153	atomic_set(&nrdy,0);
156	thread_slab = slab_cache_create("thread_slab",	154	thread_slab = slab_cache_create("thread_slab",
157	sizeof(thread_t),0,	155	sizeof(thread_t),0,
158	thr_constructor, thr_destructor, 0);	156	thr_constructor, thr_destructor, 0);
159	#ifdef ARCH_HAS_FPU	157	#ifdef ARCH_HAS_FPU
160	fpu_context_slab = slab_cache_create("fpu_slab",	158	fpu_context_slab = slab_cache_create("fpu_slab",
161	sizeof(fpu_context_t),	159	sizeof(fpu_context_t),
162	FPU_CONTEXT_ALIGN,	160	FPU_CONTEXT_ALIGN,
163	NULL, NULL, 0);	161	NULL, NULL, 0);
164	#endif	162	#endif
165	}	163	}
166		164
167		165
168	/** Make thread ready	166	/** Make thread ready
169	*	167	*
170	* Switch thread t to the ready state.	168	* Switch thread t to the ready state.
171	*	169	*
172	* @param t Thread to make ready.	170	* @param t Thread to make ready.
173	*	171	*
174	*/	172	*/
175	void thread_ready(thread_t *t)	173	void thread_ready(thread_t *t)
176	{	174	{
177	cpu_t *cpu;	175	cpu_t *cpu;
178	runq_t *r;	176	runq_t *r;
179	ipl_t ipl;	177	ipl_t ipl;
180	int i, avg;	178	int i, avg;
181		179
182	ipl = interrupts_disable();	180	ipl = interrupts_disable();
183		181
184	spinlock_lock(&t->lock);	182	spinlock_lock(&t->lock);
185		183
186	ASSERT(! (t->state == Ready));	184	ASSERT(! (t->state == Ready));
187		185
188	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	186	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
189		187
190	cpu = CPU;	188	cpu = CPU;
191	if (t->flags & X_WIRED) {	189	if (t->flags & X_WIRED) {
192	cpu = t->cpu;	190	cpu = t->cpu;
193	}	191	}
194	t->state = Ready;	192	t->state = Ready;
195	spinlock_unlock(&t->lock);	193	spinlock_unlock(&t->lock);
196		194
197	/*	195	/*
198	* Append t to respective ready queue on respective processor.	196	* Append t to respective ready queue on respective processor.
199	*/	197	*/
200	r = &cpu->rq[i];	198	r = &cpu->rq[i];
201	spinlock_lock(&r->lock);	199	spinlock_lock(&r->lock);
202	list_append(&t->rq_link, &r->rq_head);	200	list_append(&t->rq_link, &r->rq_head);
203	r->n++;	201	r->n++;
204	spinlock_unlock(&r->lock);	202	spinlock_unlock(&r->lock);
205		203
206	atomic_inc(&nrdy);	204	atomic_inc(&nrdy);
207	avg = atomic_get(&nrdy) / config.cpu_active;	205	avg = atomic_get(&nrdy) / config.cpu_active;
208	atomic_inc(&cpu->nrdy);	206	atomic_inc(&cpu->nrdy);
209		207
210	interrupts_restore(ipl);	208	interrupts_restore(ipl);
211	}	209	}
212		210
213		211
214	/** Destroy thread memory structure	212	/** Destroy thread memory structure
215	*	213	*
216	* Detach thread from all queues, cpus etc. and destroy it.	214	* Detach thread from all queues, cpus etc. and destroy it.
217	*	215	*
218	* Assume thread->lock is held!!	216	* Assume thread->lock is held!!
219	*/	217	*/
220	void thread_destroy(thread_t *t)	218	void thread_destroy(thread_t *t)
221	{	219	{
222	ASSERT(t->state == Exiting);	220	ASSERT(t->state == Exiting);
223	ASSERT(t->task);	221	ASSERT(t->task);
224	ASSERT(t->cpu);	222	ASSERT(t->cpu);
225		223
226	spinlock_lock(&t->cpu->lock);	224	spinlock_lock(&t->cpu->lock);
227	if(t->cpu->fpu_owner==t)	225	if(t->cpu->fpu_owner==t)
228	t->cpu->fpu_owner=NULL;	226	t->cpu->fpu_owner=NULL;
229	spinlock_unlock(&t->cpu->lock);	227	spinlock_unlock(&t->cpu->lock);
230		228
231	/*	229	/*
232	* Detach from the containing task.	230	* Detach from the containing task.
233	*/	231	*/
234	spinlock_lock(&t->task->lock);	232	spinlock_lock(&t->task->lock);
235	list_remove(&t->th_link);	233	list_remove(&t->th_link);
236	spinlock_unlock(&t->task->lock);	234	spinlock_unlock(&t->task->lock);
237		235
238	spinlock_unlock(&t->lock);	236	spinlock_unlock(&t->lock);
239		237
240	spinlock_lock(&threads_lock);	238	spinlock_lock(&threads_lock);
241	list_remove(&t->threads_link);	239	list_remove(&t->threads_link);
242	spinlock_unlock(&threads_lock);	240	spinlock_unlock(&threads_lock);
243		241
244	slab_free(thread_slab, t);	242	slab_free(thread_slab, t);
245	}	243	}
246		244
247		245
248	/** Create new thread	246	/** Create new thread
249	*	247	*
250	* Create a new thread.	248	* Create a new thread.
251	*	249	*
252	* @param func Thread's implementing function.	250	* @param func Thread's implementing function.
253	* @param arg Thread's implementing function argument.	251	* @param arg Thread's implementing function argument.
254	* @param task Task to which the thread belongs.	252	* @param task Task to which the thread belongs.
255	* @param flags Thread flags.	253	* @param flags Thread flags.
256	* @param name Symbolic name.	254	* @param name Symbolic name.
257	*	255	*
258	* @return New thread's structure on success, NULL on failure.	256	* @return New thread's structure on success, NULL on failure.
259	*	257	*
260	*/	258	*/
261	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)	259	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)
262	{	260	{
263	thread_t *t;	261	thread_t *t;
264	ipl_t ipl;	262	ipl_t ipl;
265		263
266	t = (thread_t *) slab_alloc(thread_slab, 0);	264	t = (thread_t *) slab_alloc(thread_slab, 0);
267	if (!t)	265	if (!t)
268	return NULL;	266	return NULL;
269		267
270	/* Not needed, but good for debugging */	268	/* Not needed, but good for debugging */
271	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	269	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
272		270
273	ipl = interrupts_disable();	271	ipl = interrupts_disable();
274	spinlock_lock(&tidlock);	272	spinlock_lock(&tidlock);
275	t->tid = ++last_tid;	273	t->tid = ++last_tid;
276	spinlock_unlock(&tidlock);	274	spinlock_unlock(&tidlock);
277	interrupts_restore(ipl);	275	interrupts_restore(ipl);
278		276
279	context_save(&t->saved_context);	277	context_save(&t->saved_context);
280	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	278	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
281		279
282	the_initialize((the_t *) t->kstack);	280	the_initialize((the_t *) t->kstack);
283		281
284	ipl = interrupts_disable();	282	ipl = interrupts_disable();
285	t->saved_context.ipl = interrupts_read();	283	t->saved_context.ipl = interrupts_read();
286	interrupts_restore(ipl);	284	interrupts_restore(ipl);
287		285
288	memcpy(t->name, name, THREAD_NAME_BUFLEN);	286	memcpy(t->name, name, THREAD_NAME_BUFLEN);
289		287
290	t->thread_code = func;	288	t->thread_code = func;
291	t->thread_arg = arg;	289	t->thread_arg = arg;
292	t->ticks = -1;	290	t->ticks = -1;
293	t->priority = -1; /* start in rq[0] */	291	t->priority = -1; /* start in rq[0] */
294	t->cpu = NULL;	292	t->cpu = NULL;
295	t->flags = 0;	293	t->flags = 0;
296	t->state = Entering;	294	t->state = Entering;
297	t->call_me = NULL;	295	t->call_me = NULL;
298	t->call_me_with = NULL;	296	t->call_me_with = NULL;
299		297
300	timeout_initialize(&t->sleep_timeout);	298	timeout_initialize(&t->sleep_timeout);
301	t->sleep_queue = NULL;	299	t->sleep_queue = NULL;
302	t->timeout_pending = 0;	300	t->timeout_pending = 0;
303		301
304	t->rwlock_holder_type = RWLOCK_NONE;	302	t->rwlock_holder_type = RWLOCK_NONE;
305		303
306	t->task = task;	304	t->task = task;
307		305
308	t->fpu_context_exists = 0;	306	t->fpu_context_exists = 0;
309	t->fpu_context_engaged = 0;	307	t->fpu_context_engaged = 0;
310		308
311	/*	309	/*
312	* Register this thread in the system-wide list.	310	* Register this thread in the system-wide list.
313	*/	311	*/
314	ipl = interrupts_disable();	312	ipl = interrupts_disable();
315	spinlock_lock(&threads_lock);	313	spinlock_lock(&threads_lock);
316	list_append(&t->threads_link, &threads_head);	314	list_append(&t->threads_link, &threads_head);
317	spinlock_unlock(&threads_lock);	315	spinlock_unlock(&threads_lock);
318		316
319	/*	317	/*
320	* Attach to the containing task.	318	* Attach to the containing task.
321	*/	319	*/
322	spinlock_lock(&task->lock);	320	spinlock_lock(&task->lock);
323	list_append(&t->th_link, &task->th_head);	321	list_append(&t->th_link, &task->th_head);
324	spinlock_unlock(&task->lock);	322	spinlock_unlock(&task->lock);
325		323
326	interrupts_restore(ipl);	324	interrupts_restore(ipl);
327		325
328	return t;	326	return t;
329	}	327	}
330		328
331		329
332	/** Make thread exiting	330	/** Make thread exiting
333	*	331	*
334	* End current thread execution and switch it to the exiting	332	* End current thread execution and switch it to the exiting
335	* state. All pending timeouts are executed.	333	* state. All pending timeouts are executed.
336	*	334	*
337	*/	335	*/
338	void thread_exit(void)	336	void thread_exit(void)
339	{	337	{
340	ipl_t ipl;	338	ipl_t ipl;
341		339
342	restart:	340	restart:
343	ipl = interrupts_disable();	341	ipl = interrupts_disable();
344	spinlock_lock(&THREAD->lock);	342	spinlock_lock(&THREAD->lock);
345	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	343	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
346	spinlock_unlock(&THREAD->lock);	344	spinlock_unlock(&THREAD->lock);
347	interrupts_restore(ipl);	345	interrupts_restore(ipl);
348	goto restart;	346	goto restart;
349	}	347	}
350	THREAD->state = Exiting;	348	THREAD->state = Exiting;
351	spinlock_unlock(&THREAD->lock);	349	spinlock_unlock(&THREAD->lock);
352	scheduler();	350	scheduler();
353	}	351	}
354		352
355		353
356	/** Thread sleep	354	/** Thread sleep
357	*	355	*
358	* Suspend execution of the current thread.	356	* Suspend execution of the current thread.
359	*	357	*
360	* @param sec Number of seconds to sleep.	358	* @param sec Number of seconds to sleep.
361	*	359	*
362	*/	360	*/
363	void thread_sleep(__u32 sec)	361	void thread_sleep(__u32 sec)
364	{	362	{
365	thread_usleep(sec*1000000);	363	thread_usleep(sec*1000000);
366	}	364	}
367		365
368		366
369	/** Thread usleep	367	/** Thread usleep
370	*	368	*
371	* Suspend execution of the current thread.	369	* Suspend execution of the current thread.
372	*	370	*
373	* @param usec Number of microseconds to sleep.	371	* @param usec Number of microseconds to sleep.
374	*	372	*
375	*/	373	*/
376	void thread_usleep(__u32 usec)	374	void thread_usleep(__u32 usec)
377	{	375	{
378	waitq_t wq;	376	waitq_t wq;
379		377
380	waitq_initialize(&wq);	378	waitq_initialize(&wq);
381		379
382	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	380	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
383	}	381	}
384		382
385		383
386	/** Register thread out-of-context invocation	384	/** Register thread out-of-context invocation
387	*	385	*
388	* Register a function and its argument to be executed	386	* Register a function and its argument to be executed
389	* on next context switch to the current thread.	387	* on next context switch to the current thread.
390	*	388	*
391	* @param call_me Out-of-context function.	389	* @param call_me Out-of-context function.
392	* @param call_me_with Out-of-context function argument.	390	* @param call_me_with Out-of-context function argument.
393	*	391	*
394	*/	392	*/
395	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	393	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
396	{	394	{
397	ipl_t ipl;	395	ipl_t ipl;
398		396
399	ipl = interrupts_disable();	397	ipl = interrupts_disable();
400	spinlock_lock(&THREAD->lock);	398	spinlock_lock(&THREAD->lock);
401	THREAD->call_me = call_me;	399	THREAD->call_me = call_me;
402	THREAD->call_me_with = call_me_with;	400	THREAD->call_me_with = call_me_with;
403	spinlock_unlock(&THREAD->lock);	401	spinlock_unlock(&THREAD->lock);
404	interrupts_restore(ipl);	402	interrupts_restore(ipl);
405	}	403	}
406		404
407	/** Print list of threads debug info */	405	/** Print list of threads debug info */
408	void thread_print_list(void)	406	void thread_print_list(void)
409	{	407	{
410	link_t *cur;	408	link_t *cur;
411	thread_t *t;	409	thread_t *t;
412	ipl_t ipl;	410	ipl_t ipl;
413		411
414	/* Messing with thread structures, avoid deadlock */	412	/* Messing with thread structures, avoid deadlock */
415	ipl = interrupts_disable();	413	ipl = interrupts_disable();
416	spinlock_lock(&threads_lock);	414	spinlock_lock(&threads_lock);
417		415
418	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	416	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
419	t = list_get_instance(cur, thread_t, threads_link);	417	t = list_get_instance(cur, thread_t, threads_link);
420	printf("%s: address=%P, tid=%d, state=%s\n\ttask=%P, code=%P, stack=%P, cpu=",	418	printf("%s: address=%P, tid=%d, state=%s\n\ttask=%P, code=%P, stack=%P, cpu=",
421	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);	419	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
422	if (t->cpu)	420	if (t->cpu)
423	printf("cpu%d ", t->cpu->id);	421	printf("cpu%d ", t->cpu->id);
424	else	422	else
425	printf("none");	423	printf("none");
426	printf("\n");	424	printf("\n");
427	}	425	}
428		426
429	spinlock_unlock(&threads_lock);	427	spinlock_unlock(&threads_lock);
430	interrupts_restore(ipl);	428	interrupts_restore(ipl);
431	}	429	}
432		430
433	/** Process syscall to create new thread.	431	/** Process syscall to create new thread.
434	*	432	*
435	*/	433	*/
436	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)	434	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)
437	{	435	{
438	thread_t *t;	436	thread_t *t;
439	char namebuf[THREAD_NAME_BUFLEN];	437	char namebuf[THREAD_NAME_BUFLEN];
440	uspace_arg_t kernel_uarg; / TODO: store kernel_uarg in thread_t */	438	uspace_arg_t *kernel_uarg;
441	__u32 tid;	439	__u32 tid;
442		440
443	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);	441	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
444		442
445	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	443	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
446	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));	444	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
447		445
448	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {	446	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
449	tid = t->tid;	447	tid = t->tid;
450	thread_ready(t);	448	thread_ready(t);
451	return (__native) tid;	449	return (__native) tid;
452	} else {	450	} else {
453	free(kernel_uarg);	451	free(kernel_uarg);
454	}	452	}
455		453
456	return (__native) -1;	454	return (__native) -1;
457	}	455	}
458		456
459	/** Process syscall to terminate thread.	457	/** Process syscall to terminate thread.
460	*	458	*
461	*/	459	*/
462	__native sys_thread_exit(int uspace_status)	460	__native sys_thread_exit(int uspace_status)
463	{	461	{
464	thread_exit();	462	thread_exit();
465	/* Unreachable */	463	/* Unreachable */
466	return 0;	464	return 0;
467	}	465	}
468		466

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/proc/thread.c – Rev 1086 → 1103