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);
 
    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(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 1066	Rev 1078
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 <mm/frame.h>	33	#include <mm/frame.h>
33	#include <mm/page.h>	34	#include <mm/page.h>
34	#include <arch/asm.h>	35	#include <arch/asm.h>
35	#include <arch.h>	36	#include <arch.h>
36	#include <synch/synch.h>	37	#include <synch/synch.h>
37	#include <synch/spinlock.h>	38	#include <synch/spinlock.h>
38	#include <synch/waitq.h>	39	#include <synch/waitq.h>
39	#include <synch/rwlock.h>	40	#include <synch/rwlock.h>
40	#include <cpu.h>	41	#include <cpu.h>
41	#include <func.h>	42	#include <func.h>
42	#include <context.h>	43	#include <context.h>
43	#include <adt/list.h>	44	#include <adt/list.h>
44	#include <typedefs.h>	45	#include <typedefs.h>
45	#include <time/clock.h>	46	#include <time/clock.h>
46	#include <adt/list.h>	47	#include <adt/list.h>
47	#include <config.h>	48	#include <config.h>
48	#include <arch/interrupt.h>	49	#include <arch/interrupt.h>
49	#include <smp/ipi.h>	50	#include <smp/ipi.h>
50	#include <arch/faddr.h>	51	#include <arch/faddr.h>
51	#include <arch/atomic.h>	52	#include <arch/atomic.h>
52	#include <memstr.h>	53	#include <memstr.h>
53	#include <print.h>	54	#include <print.h>
54	#include <mm/slab.h>	55	#include <mm/slab.h>
55	#include <debug.h>	56	#include <debug.h>
56	#include <main/uinit.h>	57	#include <main/uinit.h>
57		58
58	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	59	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
59		60
60	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. /
61	LIST_INITIALIZE(threads_head); /*< List of all threads. /	62	LIST_INITIALIZE(threads_head); /*< List of all threads. /
62		63
63	SPINLOCK_INITIALIZE(tidlock);	64	SPINLOCK_INITIALIZE(tidlock);
64	__u32 last_tid = 0;	65	__u32 last_tid = 0;
65		66
66	static slab_cache_t *thread_slab;	67	static slab_cache_t *thread_slab;
67	#ifdef ARCH_HAS_FPU	68	#ifdef ARCH_HAS_FPU
68	slab_cache_t *fpu_context_slab;	69	slab_cache_t *fpu_context_slab;
69	#endif	70	#endif
70		71
71		72
72	/** Thread wrapper	73	/** Thread wrapper
73	*	74	*
74	* This wrapper is provided to ensure that every thread	75	* This wrapper is provided to ensure that every thread
75	* makes a call to thread_exit() when its implementing	76	* makes a call to thread_exit() when its implementing
76	* function returns.	77	* function returns.
77	*	78	*
78	* interrupts_disable() is assumed.	79	* interrupts_disable() is assumed.
79	*	80	*
80	*/	81	*/
81	static void cushion(void)	82	static void cushion(void)
82	{	83	{
83	void (f)(void ) = THREAD->thread_code;	84	void (f)(void ) = THREAD->thread_code;
84	void *arg = THREAD->thread_arg;	85	void *arg = THREAD->thread_arg;
85		86
86	/* this is where each thread wakes up after its creation */	87	/* this is where each thread wakes up after its creation */
87	before_thread_runs();	88	before_thread_runs();
88		89
89	spinlock_unlock(&THREAD->lock);	90	spinlock_unlock(&THREAD->lock);
90	interrupts_enable();	91	interrupts_enable();
91		92
92	f(arg);	93	f(arg);
93	thread_exit();	94	thread_exit();
94	/* not reached */	95	/* not reached */
95	}	96	}
96		97
97	/** Initialization and allocation for thread_t structure */	98	/** Initialization and allocation for thread_t structure */
98	static int thr_constructor(void *obj, int kmflags)	99	static int thr_constructor(void *obj, int kmflags)
99	{	100	{
100	thread_t t = (thread_t )obj;	101	thread_t t = (thread_t )obj;
101	pfn_t pfn;	102	pfn_t pfn;
102	int status;	103	int status;
103		104
104	spinlock_initialize(&t->lock, "thread_t_lock");	105	spinlock_initialize(&t->lock, "thread_t_lock");
105	link_initialize(&t->rq_link);	106	link_initialize(&t->rq_link);
106	link_initialize(&t->wq_link);	107	link_initialize(&t->wq_link);
107	link_initialize(&t->th_link);	108	link_initialize(&t->th_link);
108	link_initialize(&t->threads_link);	109	link_initialize(&t->threads_link);
109		110
110	#ifdef ARCH_HAS_FPU	111	#ifdef ARCH_HAS_FPU
111	# ifdef CONFIG_FPU_LAZY	112	# ifdef CONFIG_FPU_LAZY
112	t->saved_fpu_context = NULL;	113	t->saved_fpu_context = NULL;
113	# else	114	# else
114	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);	115	t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
115	if (!t->saved_fpu_context)	116	if (!t->saved_fpu_context)
116	return -1;	117	return -1;
117	# endif	118	# endif
118	#endif	119	#endif
119		120
120	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);	121	pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA \| kmflags,&status);
121	if (status) {	122	if (status) {
122	#ifdef ARCH_HAS_FPU	123	#ifdef ARCH_HAS_FPU
123	if (t->saved_fpu_context)	124	if (t->saved_fpu_context)
124	slab_free(fpu_context_slab,t->saved_fpu_context);	125	slab_free(fpu_context_slab,t->saved_fpu_context);
125	#endif	126	#endif
126	return -1;	127	return -1;
127	}	128	}
128	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));	129	t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
129		130
130	return 0;	131	return 0;
131	}	132	}
132		133
133	/** Destruction of thread_t object */	134	/** Destruction of thread_t object */
134	static int thr_destructor(void *obj)	135	static int thr_destructor(void *obj)
135	{	136	{
136	thread_t t = (thread_t )obj;	137	thread_t t = (thread_t )obj;
137		138
138	frame_free(ADDR2PFN(KA2PA(t->kstack)));	139	frame_free(ADDR2PFN(KA2PA(t->kstack)));
139	#ifdef ARCH_HAS_FPU	140	#ifdef ARCH_HAS_FPU
140	if (t->saved_fpu_context)	141	if (t->saved_fpu_context)
141	slab_free(fpu_context_slab,t->saved_fpu_context);	142	slab_free(fpu_context_slab,t->saved_fpu_context);
142	#endif	143	#endif
143	return 1; /* One page freed */	144	return 1; /* One page freed */
144	}	145	}
145		146
146	/** Initialize threads	147	/** Initialize threads
147	*	148	*
148	* Initialize kernel threads support.	149	* Initialize kernel threads support.
149	*	150	*
150	*/	151	*/
151	void thread_init(void)	152	void thread_init(void)
152	{	153	{
153	THREAD = NULL;	154	THREAD = NULL;
154	atomic_set(&nrdy,0);	155	atomic_set(&nrdy,0);
155	thread_slab = slab_cache_create("thread_slab",	156	thread_slab = slab_cache_create("thread_slab",
156	sizeof(thread_t),0,	157	sizeof(thread_t),0,
157	thr_constructor, thr_destructor, 0);	158	thr_constructor, thr_destructor, 0);
158	#ifdef ARCH_HAS_FPU	159	#ifdef ARCH_HAS_FPU
159	fpu_context_slab = slab_cache_create("fpu_slab",	160	fpu_context_slab = slab_cache_create("fpu_slab",
160	sizeof(fpu_context_t),	161	sizeof(fpu_context_t),
161	FPU_CONTEXT_ALIGN,	162	FPU_CONTEXT_ALIGN,
162	NULL, NULL, 0);	163	NULL, NULL, 0);
163	#endif	164	#endif
164	}	165	}
165		166
166		167
167	/** Make thread ready	168	/** Make thread ready
168	*	169	*
169	* Switch thread t to the ready state.	170	* Switch thread t to the ready state.
170	*	171	*
171	* @param t Thread to make ready.	172	* @param t Thread to make ready.
172	*	173	*
173	*/	174	*/
174	void thread_ready(thread_t *t)	175	void thread_ready(thread_t *t)
175	{	176	{
176	cpu_t *cpu;	177	cpu_t *cpu;
177	runq_t *r;	178	runq_t *r;
178	ipl_t ipl;	179	ipl_t ipl;
179	int i, avg;	180	int i, avg;
180		181
181	ipl = interrupts_disable();	182	ipl = interrupts_disable();
182		183
183	spinlock_lock(&t->lock);	184	spinlock_lock(&t->lock);
184		185
185	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	186	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
186		187
187	cpu = CPU;	188	cpu = CPU;
188	if (t->flags & X_WIRED) {	189	if (t->flags & X_WIRED) {
189	cpu = t->cpu;	190	cpu = t->cpu;
190	}	191	}
191	spinlock_unlock(&t->lock);	192	spinlock_unlock(&t->lock);
192		193
193	/*	194	/*
194	* Append t to respective ready queue on respective processor.	195	* Append t to respective ready queue on respective processor.
195	*/	196	*/
196	r = &cpu->rq[i];	197	r = &cpu->rq[i];
197	spinlock_lock(&r->lock);	198	spinlock_lock(&r->lock);
198	list_append(&t->rq_link, &r->rq_head);	199	list_append(&t->rq_link, &r->rq_head);
199	r->n++;	200	r->n++;
200	spinlock_unlock(&r->lock);	201	spinlock_unlock(&r->lock);
201		202
202	atomic_inc(&nrdy);	203	atomic_inc(&nrdy);
203	avg = atomic_get(&nrdy) / config.cpu_active;	204	avg = atomic_get(&nrdy) / config.cpu_active;
204	atomic_inc(&cpu->nrdy);	205	atomic_inc(&cpu->nrdy);
205		206
206	interrupts_restore(ipl);	207	interrupts_restore(ipl);
207	}	208	}
208		209
209		210
210	/** Destroy thread memory structure	211	/** Destroy thread memory structure
211	*	212	*
212	* Detach thread from all queues, cpus etc. and destroy it.	213	* Detach thread from all queues, cpus etc. and destroy it.
213	*	214	*
214	* Assume thread->lock is held!!	215	* Assume thread->lock is held!!
215	*/	216	*/
216	void thread_destroy(thread_t *t)	217	void thread_destroy(thread_t *t)
217	{	218	{
218	ASSERT(t->state == Exiting);	219	ASSERT(t->state == Exiting);
219	ASSERT(t->task);	220	ASSERT(t->task);
220	ASSERT(t->cpu);	221	ASSERT(t->cpu);
221		222
222	spinlock_lock(&t->cpu->lock);	223	spinlock_lock(&t->cpu->lock);
223	if(t->cpu->fpu_owner==t)	224	if(t->cpu->fpu_owner==t)
224	t->cpu->fpu_owner=NULL;	225	t->cpu->fpu_owner=NULL;
225	spinlock_unlock(&t->cpu->lock);	226	spinlock_unlock(&t->cpu->lock);
226		227
227	/*	228	/*
228	* Detach from the containing task.	229	* Detach from the containing task.
229	*/	230	*/
230	spinlock_lock(&t->task->lock);	231	spinlock_lock(&t->task->lock);
231	list_remove(&t->th_link);	232	list_remove(&t->th_link);
232	spinlock_unlock(&t->task->lock);	233	spinlock_unlock(&t->task->lock);
233		234
234	spinlock_unlock(&t->lock);	235	spinlock_unlock(&t->lock);
235		236
236	spinlock_lock(&threads_lock);	237	spinlock_lock(&threads_lock);
237	list_remove(&t->threads_link);	238	list_remove(&t->threads_link);
238	spinlock_unlock(&threads_lock);	239	spinlock_unlock(&threads_lock);
239		240
240	slab_free(thread_slab, t);	241	slab_free(thread_slab, t);
241	}	242	}
242		243
243		244
244	/** Create new thread	245	/** Create new thread
245	*	246	*
246	* Create a new thread.	247	* Create a new thread.
247	*	248	*
248	* @param func Thread's implementing function.	249	* @param func Thread's implementing function.
249	* @param arg Thread's implementing function argument.	250	* @param arg Thread's implementing function argument.
250	* @param task Task to which the thread belongs.	251	* @param task Task to which the thread belongs.
251	* @param flags Thread flags.	252	* @param flags Thread flags.
252	* @param name Symbolic name.	253	* @param name Symbolic name.
253	*	254	*
254	* @return New thread's structure on success, NULL on failure.	255	* @return New thread's structure on success, NULL on failure.
255	*	256	*
256	*/	257	*/
257	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)	258	thread_t thread_create(void ( func)(void ), void arg, task_t task, int flags, char name)
258	{	259	{
259	thread_t *t;	260	thread_t *t;
260	ipl_t ipl;	261	ipl_t ipl;
261		262
262	t = (thread_t *) slab_alloc(thread_slab, 0);	263	t = (thread_t *) slab_alloc(thread_slab, 0);
263	if (!t)	264	if (!t)
264	return NULL;	265	return NULL;
265		266
266	/* Not needed, but good for debugging */	267	/* Not needed, but good for debugging */
267	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);	268	memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
268		269
269	ipl = interrupts_disable();	270	ipl = interrupts_disable();
270	spinlock_lock(&tidlock);	271	spinlock_lock(&tidlock);
271	t->tid = ++last_tid;	272	t->tid = ++last_tid;
272	spinlock_unlock(&tidlock);	273	spinlock_unlock(&tidlock);
273	interrupts_restore(ipl);	274	interrupts_restore(ipl);
274		275
275	context_save(&t->saved_context);	276	context_save(&t->saved_context);
276	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	277	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
277		278
278	the_initialize((the_t *) t->kstack);	279	the_initialize((the_t *) t->kstack);
279		280
280	ipl = interrupts_disable();	281	ipl = interrupts_disable();
281	t->saved_context.ipl = interrupts_read();	282	t->saved_context.ipl = interrupts_read();
282	interrupts_restore(ipl);	283	interrupts_restore(ipl);
283		284
284	memcpy(t->name, name, THREAD_NAME_BUFLEN);	285	memcpy(t->name, name, THREAD_NAME_BUFLEN);
285		286
286	t->thread_code = func;	287	t->thread_code = func;
287	t->thread_arg = arg;	288	t->thread_arg = arg;
288	t->ticks = -1;	289	t->ticks = -1;
289	t->priority = -1; /* start in rq[0] */	290	t->priority = -1; /* start in rq[0] */
290	t->cpu = NULL;	291	t->cpu = NULL;
291	t->flags = 0;	292	t->flags = 0;
292	t->state = Entering;	293	t->state = Entering;
293	t->call_me = NULL;	294	t->call_me = NULL;
294	t->call_me_with = NULL;	295	t->call_me_with = NULL;
295		296
296	timeout_initialize(&t->sleep_timeout);	297	timeout_initialize(&t->sleep_timeout);
297	t->sleep_queue = NULL;	298	t->sleep_queue = NULL;
298	t->timeout_pending = 0;	299	t->timeout_pending = 0;
299		300
300	t->rwlock_holder_type = RWLOCK_NONE;	301	t->rwlock_holder_type = RWLOCK_NONE;
301		302
302	t->task = task;	303	t->task = task;
303		304
304	t->fpu_context_exists = 0;	305	t->fpu_context_exists = 0;
305	t->fpu_context_engaged = 0;	306	t->fpu_context_engaged = 0;
306		307
307	/*	308	/*
308	* Register this thread in the system-wide list.	309	* Register this thread in the system-wide list.
309	*/	310	*/
310	ipl = interrupts_disable();	311	ipl = interrupts_disable();
311	spinlock_lock(&threads_lock);	312	spinlock_lock(&threads_lock);
312	list_append(&t->threads_link, &threads_head);	313	list_append(&t->threads_link, &threads_head);
313	spinlock_unlock(&threads_lock);	314	spinlock_unlock(&threads_lock);
314		315
315	/*	316	/*
316	* Attach to the containing task.	317	* Attach to the containing task.
317	*/	318	*/
318	spinlock_lock(&task->lock);	319	spinlock_lock(&task->lock);
319	list_append(&t->th_link, &task->th_head);	320	list_append(&t->th_link, &task->th_head);
320	spinlock_unlock(&task->lock);	321	spinlock_unlock(&task->lock);
321		322
322	interrupts_restore(ipl);	323	interrupts_restore(ipl);
323		324
324	return t;	325	return t;
325	}	326	}
326		327
327		328
328	/** Make thread exiting	329	/** Make thread exiting
329	*	330	*
330	* End current thread execution and switch it to the exiting	331	* End current thread execution and switch it to the exiting
331	* state. All pending timeouts are executed.	332	* state. All pending timeouts are executed.
332	*	333	*
333	*/	334	*/
334	void thread_exit(void)	335	void thread_exit(void)
335	{	336	{
336	ipl_t ipl;	337	ipl_t ipl;
337		338
338	restart:	339	restart:
339	ipl = interrupts_disable();	340	ipl = interrupts_disable();
340	spinlock_lock(&THREAD->lock);	341	spinlock_lock(&THREAD->lock);
341	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	342	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
342	spinlock_unlock(&THREAD->lock);	343	spinlock_unlock(&THREAD->lock);
343	interrupts_restore(ipl);	344	interrupts_restore(ipl);
344	goto restart;	345	goto restart;
345	}	346	}
346	THREAD->state = Exiting;	347	THREAD->state = Exiting;
347	spinlock_unlock(&THREAD->lock);	348	spinlock_unlock(&THREAD->lock);
348	scheduler();	349	scheduler();
349	}	350	}
350		351
351		352
352	/** Thread sleep	353	/** Thread sleep
353	*	354	*
354	* Suspend execution of the current thread.	355	* Suspend execution of the current thread.
355	*	356	*
356	* @param sec Number of seconds to sleep.	357	* @param sec Number of seconds to sleep.
357	*	358	*
358	*/	359	*/
359	void thread_sleep(__u32 sec)	360	void thread_sleep(__u32 sec)
360	{	361	{
361	thread_usleep(sec*1000000);	362	thread_usleep(sec*1000000);
362	}	363	}
363		364
364		365
365	/** Thread usleep	366	/** Thread usleep
366	*	367	*
367	* Suspend execution of the current thread.	368	* Suspend execution of the current thread.
368	*	369	*
369	* @param usec Number of microseconds to sleep.	370	* @param usec Number of microseconds to sleep.
370	*	371	*
371	*/	372	*/
372	void thread_usleep(__u32 usec)	373	void thread_usleep(__u32 usec)
373	{	374	{
374	waitq_t wq;	375	waitq_t wq;
375		376
376	waitq_initialize(&wq);	377	waitq_initialize(&wq);
377		378
378	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	379	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
379	}	380	}
380		381
381		382
382	/** Register thread out-of-context invocation	383	/** Register thread out-of-context invocation
383	*	384	*
384	* Register a function and its argument to be executed	385	* Register a function and its argument to be executed
385	* on next context switch to the current thread.	386	* on next context switch to the current thread.
386	*	387	*
387	* @param call_me Out-of-context function.	388	* @param call_me Out-of-context function.
388	* @param call_me_with Out-of-context function argument.	389	* @param call_me_with Out-of-context function argument.
389	*	390	*
390	*/	391	*/
391	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	392	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
392	{	393	{
393	ipl_t ipl;	394	ipl_t ipl;
394		395
395	ipl = interrupts_disable();	396	ipl = interrupts_disable();
396	spinlock_lock(&THREAD->lock);	397	spinlock_lock(&THREAD->lock);
397	THREAD->call_me = call_me;	398	THREAD->call_me = call_me;
398	THREAD->call_me_with = call_me_with;	399	THREAD->call_me_with = call_me_with;
399	spinlock_unlock(&THREAD->lock);	400	spinlock_unlock(&THREAD->lock);
400	interrupts_restore(ipl);	401	interrupts_restore(ipl);
401	}	402	}
402		403
403	/** Print list of threads debug info */	404	/** Print list of threads debug info */
404	void thread_print_list(void)	405	void thread_print_list(void)
405	{	406	{
406	link_t *cur;	407	link_t *cur;
407	thread_t *t;	408	thread_t *t;
408	ipl_t ipl;	409	ipl_t ipl;
409		410
410	/* Messing with thread structures, avoid deadlock */	411	/* Messing with thread structures, avoid deadlock */
411	ipl = interrupts_disable();	412	ipl = interrupts_disable();
412	spinlock_lock(&threads_lock);	413	spinlock_lock(&threads_lock);
413		414
414	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	415	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
415	t = list_get_instance(cur, thread_t, threads_link);	416	t = list_get_instance(cur, thread_t, threads_link);
416	printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",	417	printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
417	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);	418	t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
418	if (t->cpu)	419	if (t->cpu)
419	printf("cpu%d ", t->cpu->id);	420	printf("cpu%d ", t->cpu->id);
420	else	421	else
421	printf("none");	422	printf("none");
422	printf("\n");	423	printf("\n");
423	}	424	}
424		425
425	spinlock_unlock(&threads_lock);	426	spinlock_unlock(&threads_lock);
426	interrupts_restore(ipl);	427	interrupts_restore(ipl);
427	}	428	}
428		429
429	/** Process syscall to create new thread.	430	/** Process syscall to create new thread.
430	*	431	*
431	*/	432	*/
432	__native sys_thread_create(__address function, void arg, void stack, char *name)	433	__native sys_thread_create(uspace_arg_t uspace_uarg, char uspace_name)
433	{	434	{
434	thread_t *t;	435	thread_t *t;
435	char namebuf[THREAD_NAME_BUFLEN];	436	char namebuf[THREAD_NAME_BUFLEN];
436	uspace_arg_t *uarg;	437	uspace_arg_t kernel_uarg; / TODO: store kernel_uarg in thread_t */
437	__u32 tid;	438	__u32 tid;
438		439
439	copy_from_uspace(namebuf, name, THREAD_NAME_BUFLEN);	440	copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
440	uarg = (uspace_arg_t *) malloc(sizeof(uarg), 0);	-
441		441
442	uarg->uspace_entry = function;	442	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
443	uarg->uspace_stack = (__address) stack;	443	copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
444		444
445	if ((t = thread_create(uinit, uarg, TASK, 0, namebuf))) {	445	if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
446	tid = t->tid;	446	tid = t->tid;
447	thread_ready(t);	447	thread_ready(t);
448	return (__native) tid;	448	return (__native) tid;
449	} else {	449	} else {
450	free(namebuf);	450	free(kernel_uarg);
451	}	451	}
452		452
453	return (__native) -1;	453	return (__native) -1;
454	}	454	}
455		455
456	/** Process syscall to terminate thread.	456	/** Process syscall to terminate thread.
457	*	457	*
458	*/	458	*/
459	__native sys_thread_exit(int status)	459	__native sys_thread_exit(int uspace_status)
460	{	460	{
461	thread_exit();	461	thread_exit();
462	/* Unreachable */	462	/* Unreachable */
463	return 0;	463	return 0;
464	}	464	}
465		465

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/proc/thread.c – Rev 1066 → 1078