1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/* fiber.c - fiber management
*
* Copyright (C) 2009 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 or later as
* published by the Free Software Foundation.
*
* See http://www.gnu.org/ for details.
*/
#include <time.h>
#include <errno.h>
#include <unistd.h>
#include <libtf/atomic.h>
#include <libtf/fiber.h>
#include <libtf/vmach.h>
#include "uctx.h"
#define TF_FIBERF_RUNNING TF_BIT(0)
#define TF_FIBERF_WAKEUP_PENDING TF_BIT(1)
static void tf_fiber_main(void *user_data, void *arg)
{
tf_fiber_proc proc = (tf_fiber_proc) arg;
struct tf_fiber *f = user_data;
proc(f->data);
tf_fiber_exit();
}
void *tf_fiber_create(tf_fiber_proc fiber_main, int private_size)
{
struct tf_fiber *self = tf_vmach_get_current_fiber();
struct tf_fiber *f;
f = tf_uctx_create_embedded(
TF_STACK_SIZE,
sizeof(struct tf_fiber) + private_size,
offsetof(struct tf_fiber, context),
tf_fiber_main, fiber_main);
if (f == NULL)
return NULL;
*f = (struct tf_fiber) {
.ref_count = 1,
.queue_node = TF_LIST_INITIALIZER(f->queue_node),
.context = f->context,
.timeout.manager = self ? self->timeout.manager : NULL,
.wakeup_q = TF_LIST_HEAD_INITIALIZER(f->wakeup_q),
};
return f->data;
}
int tf_fiber_run(void *fiber)
{
struct tf_timeout_manager *tm;
struct tf_fiber *f = container_of(fiber, struct tf_fiber, data);
tm = f->timeout.manager;
if (tm != NULL) {
if (tf_heap_prealloc(&tm->heap, tm->num_fibers + 1) < 0)
return -ENOMEM;
tm->num_fibers++;
}
tf_fiber_wakeup(f);
tf_vmach_get_current()->num_user_fibers++;
return 0;
}
void *tf_fiber_get(void *data)
{
struct tf_fiber *fiber = container_of(data, struct tf_fiber, data);
tf_atomic_inc(fiber->ref_count);
return data;
}
static void __tf_fiber_destroy(struct tf_fiber *fiber)
{
tf_heap_delete(&fiber->timeout.heap_node, &fiber->timeout.manager->heap);
tf_uctx_destroy(fiber->context);
}
void tf_fiber_put(void *data)
{
struct tf_fiber *fiber = container_of(data, struct tf_fiber, data);
if (tf_atomic_dec(fiber->ref_count) == 0)
__tf_fiber_destroy(fiber);
}
void tf_fiber_wakeup(struct tf_fiber *f)
{
struct tf_fiber *self = tf_vmach_get_current_fiber();
unsigned int newval, oldval;
do {
oldval = f->flags;
if (oldval & TF_FIBERF_WAKEUP_PENDING)
return;
newval = oldval | TF_FIBERF_WAKEUP_PENDING | TF_FIBERF_RUNNING;
} while (!tf_atomic_cmpxchg(&f->flags, oldval, newval));
if (!(oldval & TF_FIBERF_RUNNING))
tf_list_add_tail(&f->queue_node, &self->wakeup_q);
}
int tf_fiber_schedule(void)
{
struct tf_fiber *f = tf_vmach_get_current_fiber();
if (f->timeout.value != 0 &&
tf_mtime_diff(f->timeout.value, tf_mtime_now()) <= 0)
return -ETIME;
if (f->flags & TF_FIBERF_WAKEUP_PENDING) {
f->flags = TF_FIBERF_RUNNING;
return 0;
}
if (f->timeout.value != f->timeout.latched)
tf_timeout_adjust(&f->timeout);
f->flags = 0;
tf_uctx_transfer(f->context, f->return_context);
f->flags = TF_FIBERF_RUNNING;
if (f->timeout.value != 0 &&
tf_mtime_diff(f->timeout.value, tf_mtime_now()) <= 0)
return -ETIME;
return 0;
}
void tf_fiber_exit(void)
{
struct tf_fiber *f = tf_vmach_get_current_fiber();
if (f->timeout.manager != NULL)
tf_timeout_delete(&f->timeout);
tf_vmach_get_current()->num_user_fibers--;
tf_uctx_transfer(f->context, f->return_context);
TF_BUG_ON(1);
}
void tf_fiber_kill(void *fiber)
{
}
|
