WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/time/timeout.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 <time/timeout.h>
#include <typedefs.h>
#include <arch/types.h>
#include <config.h>
#include <panic.h>
#include <synch/spinlock.h>
#include <func.h>
#include <cpu.h>
#include <print.h>
#include <arch/asm.h>
#include <arch.h>
#include <print.h>
 
 
/** Initialize timeouts
 *
 * Initialize kernel timeouts.
 *
 */
void timeout_init(void)
{
    spinlock_initialize(&CPU->timeoutlock, "timeout_lock");
    list_initialize(&CPU->timeout_active_head);
}
 
 
/** Reinitialize timeout
 *
 * Initialize all members except the lock.
 *
 * @param t Timeout to be initialized.
 *
 */
void timeout_reinitialize(timeout_t *t)
{
    t->cpu = NULL;
    t->ticks = 0;
    t->handler = NULL;
    t->arg = NULL;
    link_initialize(&t->link);
}
 
 
/** Initialize timeout
 *
 * Initialize all members including the lock.
 *
 * @param t Timeout to be initialized.
 *
 */
void timeout_initialize(timeout_t *t)
{
    spinlock_initialize(&t->lock, "timeout_t_lock");
    timeout_reinitialize(t);
}
 
 
/** Register timeout
 *
 * Insert timeout handler f (with argument arg)
 * to timeout list and make it execute in
 * time microseconds (or slightly more).
 *
 * @param t    Timeout structure.
 * @param time Number of usec in the future to execute
 *             the handler.
 * @param f    Timeout handler function.
 * @param arg  Timeout handler argument.
 *
 */
void timeout_register(timeout_t *t, __u64 time, timeout_handler_t f, void *arg)
{
    timeout_t *hlp = NULL;
    link_t *l, *m;
    ipl_t ipl;
    __u64 sum;
 
    ipl = interrupts_disable();
    spinlock_lock(&CPU->timeoutlock);
    spinlock_lock(&t->lock);
 
    if (t->cpu)
        panic("t->cpu != 0");
 
    t->cpu = CPU;
    t->ticks = us2ticks(time);
   
    t->handler = f;
    t->arg = arg;
 
    /*
     * Insert t into the active timeouts list according to t->ticks.
     */
    sum = 0;
    l = CPU->timeout_active_head.next;
    while (l != &CPU->timeout_active_head) {
        hlp = list_get_instance(l, timeout_t, link);
        spinlock_lock(&hlp->lock);
        if (t->ticks < sum + hlp->ticks) {
            spinlock_unlock(&hlp->lock);
            break;
        }
        sum += hlp->ticks;
        spinlock_unlock(&hlp->lock);
        l = l->next;
    }
 
    m = l->prev;
    list_prepend(&t->link, m); /* avoid using l->prev */
 
    /*
     * Adjust t->ticks according to ticks accumulated in h's predecessors.
     */
    t->ticks -= sum;
 
    /*
     * Decrease ticks of t's immediate succesor by t->ticks.
     */
    if (l != &CPU->timeout_active_head) {
        spinlock_lock(&hlp->lock);
        hlp->ticks -= t->ticks;
        spinlock_unlock(&hlp->lock);
    }
 
    spinlock_unlock(&t->lock);
    spinlock_unlock(&CPU->timeoutlock);
    interrupts_restore(ipl);
}
 
 
/** Unregister timeout
 *
 * Remove timeout from timeout list.
 *
 * @param t Timeout to unregister.
 *
 * @return true on success, false on failure.
 */
bool timeout_unregister(timeout_t *t)
{
    timeout_t *hlp;
    link_t *l;
    ipl_t ipl;
 
grab_locks:
    ipl = interrupts_disable();
    spinlock_lock(&t->lock);
    if (!t->cpu) {
        spinlock_unlock(&t->lock);
        interrupts_restore(ipl);
        return false;
    }
    if (!spinlock_trylock(&t->cpu->timeoutlock)) {
        spinlock_unlock(&t->lock);
        interrupts_restore(ipl);       
        goto grab_locks;
    }
   
    /*
     * Now we know for sure that t hasn't been activated yet
     * and is lurking in t->cpu->timeout_active_head queue.
     */
 
    l = t->link.next;
    if (l != &t->cpu->timeout_active_head) {
        hlp = list_get_instance(l, timeout_t, link);
        spinlock_lock(&hlp->lock);
        hlp->ticks += t->ticks;
        spinlock_unlock(&hlp->lock);
    }
   
    list_remove(&t->link);
    spinlock_unlock(&t->cpu->timeoutlock);
 
    timeout_reinitialize(t);
    spinlock_unlock(&t->lock);
 
    interrupts_restore(ipl);
    return true;
}
 

Rev 552	Rev 659
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 <time/timeout.h>	29	#include <time/timeout.h>
30	#include <typedefs.h>	30	#include <typedefs.h>
31	#include <arch/types.h>	31	#include <arch/types.h>
32	#include <config.h>	32	#include <config.h>
33	#include <panic.h>	33	#include <panic.h>
34	#include <synch/spinlock.h>	34	#include <synch/spinlock.h>
35	#include <func.h>	35	#include <func.h>
36	#include <cpu.h>	36	#include <cpu.h>
37	#include <print.h>	37	#include <print.h>
38	#include <arch/asm.h>	38	#include <arch/asm.h>
39	#include <arch.h>	39	#include <arch.h>
40	#include <print.h>	40	#include <print.h>
41		41
42		42
43	/** Initialize timeouts	43	/** Initialize timeouts
44	*	44	*
45	* Initialize kernel timeouts.	45	* Initialize kernel timeouts.
46	*	46	*
47	*/	47	*/
48	void timeout_init(void)	48	void timeout_init(void)
49	{	49	{
50	spinlock_initialize(&CPU->timeoutlock, "timeout_lock");	50	spinlock_initialize(&CPU->timeoutlock, "timeout_lock");
51	list_initialize(&CPU->timeout_active_head);	51	list_initialize(&CPU->timeout_active_head);
52	}	52	}
53		53
54		54
55	/** Reinitialize timeout	55	/** Reinitialize timeout
56	*	56	*
57	* Initialize all members except the lock.	57	* Initialize all members except the lock.
58	*	58	*
59	* @param t Timeout to be initialized.	59	* @param t Timeout to be initialized.
60	*	60	*
61	*/	61	*/
62	void timeout_reinitialize(timeout_t *t)	62	void timeout_reinitialize(timeout_t *t)
63	{	63	{
64	t->cpu = NULL;	64	t->cpu = NULL;
65	t->ticks = 0;	65	t->ticks = 0;
66	t->handler = NULL;	66	t->handler = NULL;
67	t->arg = NULL;	67	t->arg = NULL;
68	link_initialize(&t->link);	68	link_initialize(&t->link);
69	}	69	}
70		70
71		71
72	/** Initialize timeout	72	/** Initialize timeout
73	*	73	*
74	* Initialize all members including the lock.	74	* Initialize all members including the lock.
75	*	75	*
76	* @param t Timeout to be initialized.	76	* @param t Timeout to be initialized.
77	*	77	*
78	*/	78	*/
79	void timeout_initialize(timeout_t *t)	79	void timeout_initialize(timeout_t *t)
80	{	80	{
81	spinlock_initialize(&t->lock, "timeout_t_lock");	81	spinlock_initialize(&t->lock, "timeout_t_lock");
82	timeout_reinitialize(t);	82	timeout_reinitialize(t);
83	}	83	}
84		84
85		85
86	/** Register timeout	86	/** Register timeout
87	*	87	*
88	* Insert timeout handler f (with argument arg)	88	* Insert timeout handler f (with argument arg)
89	* to timeout list and make it execute in	89	* to timeout list and make it execute in
90	* time microseconds (or slightly more).	90	* time microseconds (or slightly more).
91	*	91	*
92	* @param t Timeout structure.	92	* @param t Timeout structure.
93	* @param time Number of usec in the future to execute	93	* @param time Number of usec in the future to execute
94	* the handler.	94	* the handler.
95	* @param f Timeout handler function.	95	* @param f Timeout handler function.
96	* @param arg Timeout handler argument.	96	* @param arg Timeout handler argument.
97	*	97	*
98	*/	98	*/
99	void timeout_register(timeout_t t, __u64 time, timeout_handler_t f, void arg)	99	void timeout_register(timeout_t t, __u64 time, timeout_handler_t f, void arg)
100	{	100	{
101	timeout_t *hlp;	101	timeout_t *hlp = NULL;
102	link_t l, m;	102	link_t l, m;
103	ipl_t ipl;	103	ipl_t ipl;
104	__u64 sum;	104	__u64 sum;
105		105
106	ipl = interrupts_disable();	106	ipl = interrupts_disable();
107	spinlock_lock(&CPU->timeoutlock);	107	spinlock_lock(&CPU->timeoutlock);
108	spinlock_lock(&t->lock);	108	spinlock_lock(&t->lock);
109		109
110	if (t->cpu)	110	if (t->cpu)
111	panic("t->cpu != 0");	111	panic("t->cpu != 0");
112		112
113	t->cpu = CPU;	113	t->cpu = CPU;
114	t->ticks = us2ticks(time);	114	t->ticks = us2ticks(time);
115		115
116	t->handler = f;	116	t->handler = f;
117	t->arg = arg;	117	t->arg = arg;
118		118
119	/*	119	/*
120	* Insert t into the active timeouts list according to t->ticks.	120	* Insert t into the active timeouts list according to t->ticks.
121	*/	121	*/
122	sum = 0;	122	sum = 0;
123	l = CPU->timeout_active_head.next;	123	l = CPU->timeout_active_head.next;
124	while (l != &CPU->timeout_active_head) {	124	while (l != &CPU->timeout_active_head) {
125	hlp = list_get_instance(l, timeout_t, link);	125	hlp = list_get_instance(l, timeout_t, link);
126	spinlock_lock(&hlp->lock);	126	spinlock_lock(&hlp->lock);
127	if (t->ticks < sum + hlp->ticks) {	127	if (t->ticks < sum + hlp->ticks) {
128	spinlock_unlock(&hlp->lock);	128	spinlock_unlock(&hlp->lock);
129	break;	129	break;
130	}	130	}
131	sum += hlp->ticks;	131	sum += hlp->ticks;
132	spinlock_unlock(&hlp->lock);	132	spinlock_unlock(&hlp->lock);
133	l = l->next;	133	l = l->next;
134	}	134	}
135		135
136	m = l->prev;	136	m = l->prev;
137	list_prepend(&t->link, m); /* avoid using l->prev */	137	list_prepend(&t->link, m); /* avoid using l->prev */
138		138
139	/*	139	/*
140	* Adjust t->ticks according to ticks accumulated in h's predecessors.	140	* Adjust t->ticks according to ticks accumulated in h's predecessors.
141	*/	141	*/
142	t->ticks -= sum;	142	t->ticks -= sum;
143		143
144	/*	144	/*
145	* Decrease ticks of t's immediate succesor by t->ticks.	145	* Decrease ticks of t's immediate succesor by t->ticks.
146	*/	146	*/
147	if (l != &CPU->timeout_active_head) {	147	if (l != &CPU->timeout_active_head) {
148	spinlock_lock(&hlp->lock);	148	spinlock_lock(&hlp->lock);
149	hlp->ticks -= t->ticks;	149	hlp->ticks -= t->ticks;
150	spinlock_unlock(&hlp->lock);	150	spinlock_unlock(&hlp->lock);
151	}	151	}
152		152
153	spinlock_unlock(&t->lock);	153	spinlock_unlock(&t->lock);
154	spinlock_unlock(&CPU->timeoutlock);	154	spinlock_unlock(&CPU->timeoutlock);
155	interrupts_restore(ipl);	155	interrupts_restore(ipl);
156	}	156	}
157		157
158		158
159	/** Unregister timeout	159	/** Unregister timeout
160	*	160	*
161	* Remove timeout from timeout list.	161	* Remove timeout from timeout list.
162	*	162	*
163	* @param t Timeout to unregister.	163	* @param t Timeout to unregister.
164	*	164	*
165	* @return true on success, false on failure.	165	* @return true on success, false on failure.
166	*/	166	*/
167	bool timeout_unregister(timeout_t *t)	167	bool timeout_unregister(timeout_t *t)
168	{	168	{
169	timeout_t *hlp;	169	timeout_t *hlp;
170	link_t *l;	170	link_t *l;
171	ipl_t ipl;	171	ipl_t ipl;
172		172
173	grab_locks:	173	grab_locks:
174	ipl = interrupts_disable();	174	ipl = interrupts_disable();
175	spinlock_lock(&t->lock);	175	spinlock_lock(&t->lock);
176	if (!t->cpu) {	176	if (!t->cpu) {
177	spinlock_unlock(&t->lock);	177	spinlock_unlock(&t->lock);
178	interrupts_restore(ipl);	178	interrupts_restore(ipl);
179	return false;	179	return false;
180	}	180	}
181	if (!spinlock_trylock(&t->cpu->timeoutlock)) {	181	if (!spinlock_trylock(&t->cpu->timeoutlock)) {
182	spinlock_unlock(&t->lock);	182	spinlock_unlock(&t->lock);
183	interrupts_restore(ipl);	183	interrupts_restore(ipl);
184	goto grab_locks;	184	goto grab_locks;
185	}	185	}
186		186
187	/*	187	/*
188	* Now we know for sure that t hasn't been activated yet	188	* Now we know for sure that t hasn't been activated yet
189	* and is lurking in t->cpu->timeout_active_head queue.	189	* and is lurking in t->cpu->timeout_active_head queue.
190	*/	190	*/
191		191
192	l = t->link.next;	192	l = t->link.next;
193	if (l != &t->cpu->timeout_active_head) {	193	if (l != &t->cpu->timeout_active_head) {
194	hlp = list_get_instance(l, timeout_t, link);	194	hlp = list_get_instance(l, timeout_t, link);
195	spinlock_lock(&hlp->lock);	195	spinlock_lock(&hlp->lock);
196	hlp->ticks += t->ticks;	196	hlp->ticks += t->ticks;
197	spinlock_unlock(&hlp->lock);	197	spinlock_unlock(&hlp->lock);
198	}	198	}
199		199
200	list_remove(&t->link);	200	list_remove(&t->link);
201	spinlock_unlock(&t->cpu->timeoutlock);	201	spinlock_unlock(&t->cpu->timeoutlock);
202		202
203	timeout_reinitialize(t);	203	timeout_reinitialize(t);
204	spinlock_unlock(&t->lock);	204	spinlock_unlock(&t->lock);
205		205
206	interrupts_restore(ipl);	206	interrupts_restore(ipl);
207	return true;	207	return true;
208	}	208	}
209		209

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(root)/kernel/trunk/generic/src/time/timeout.c @ 1220 – Rev 552 → 659