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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/*
* Copyright (c) 2014,2015 DeNA Co., Ltd., Kazuho Oku
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <stdio.h>
#include <poll.h>
#if 0
#define DEBUG_LOG(...) fprintf(stderr, __VA_ARGS__)
#else
#define DEBUG_LOG(...)
#endif
struct st_h2o_evloop_poll_t {
h2o_evloop_t super;
H2O_VECTOR(struct st_h2o_evloop_socket_t *) socks;
};
static void update_socks(struct st_h2o_evloop_poll_t *loop)
{
/* update loop->socks */
while (loop->super._statechanged.head != NULL) {
/* detach the top */
struct st_h2o_evloop_socket_t *sock = loop->super._statechanged.head;
loop->super._statechanged.head = sock->_next_statechanged;
sock->_next_statechanged = sock;
/* update the state */
if ((sock->_flags & H2O_SOCKET_FLAG_IS_DISPOSED) != 0) {
assert(sock->fd == -1);
free(sock);
} else {
assert(sock->fd < loop->socks.size);
if (loop->socks.entries[sock->fd] == NULL) {
loop->socks.entries[sock->fd] = sock;
} else {
assert(loop->socks.entries[sock->fd] == sock);
}
if (h2o_socket_is_reading(&sock->super)) {
DEBUG_LOG("setting READ for fd: %d\n", sock->fd);
sock->_flags |= H2O_SOCKET_FLAG_IS_POLLED_FOR_READ;
} else {
DEBUG_LOG("clearing READ for fd: %d\n", sock->fd);
sock->_flags &= ~H2O_SOCKET_FLAG_IS_POLLED_FOR_READ;
}
if (h2o_socket_is_writing(&sock->super)) {
DEBUG_LOG("setting WRITE for fd: %d\n", sock->fd);
sock->_flags |= H2O_SOCKET_FLAG_IS_POLLED_FOR_WRITE;
} else {
DEBUG_LOG("clearing WRITE for fd: %d\n", sock->fd);
sock->_flags &= ~H2O_SOCKET_FLAG_IS_POLLED_FOR_WRITE;
}
}
}
loop->super._statechanged.tail_ref = &loop->super._statechanged.head;
}
int evloop_do_proceed(h2o_evloop_t *_loop, int32_t max_wait)
{
struct st_h2o_evloop_poll_t *loop = (struct st_h2o_evloop_poll_t *)_loop;
H2O_VECTOR(struct pollfd) pollfds = {NULL};
int fd, ret;
/* update status */
update_socks(loop);
/* build list of fds to be polled */
for (fd = 0; fd != loop->socks.size; ++fd) {
struct st_h2o_evloop_socket_t *sock = loop->socks.entries[fd];
if (sock == NULL)
continue;
assert(fd == sock->fd);
if ((sock->_flags & (H2O_SOCKET_FLAG_IS_POLLED_FOR_READ | H2O_SOCKET_FLAG_IS_POLLED_FOR_WRITE)) != 0) {
h2o_vector_reserve(NULL, &pollfds, pollfds.size + 1);
struct pollfd *slot = pollfds.entries + pollfds.size++;
slot->fd = fd;
slot->events = 0;
slot->revents = 0;
if ((sock->_flags & H2O_SOCKET_FLAG_IS_POLLED_FOR_READ) != 0)
slot->events |= POLLIN;
if ((sock->_flags & H2O_SOCKET_FLAG_IS_POLLED_FOR_WRITE) != 0)
slot->events |= POLLOUT;
}
}
/* call */
max_wait = adjust_max_wait(&loop->super, max_wait);
ret = poll(pollfds.entries, (nfds_t)pollfds.size, max_wait);
update_now(&loop->super);
if (ret == -1)
goto Exit;
DEBUG_LOG("poll returned: %d\n", ret);
/* update readable flags, perform writes */
if (ret > 0) {
size_t i;
h2o_sliding_counter_start(&loop->super.exec_time_counter, loop->super._now);
for (i = 0; i != pollfds.size; ++i) {
/* set read_ready flag before calling the write cb, since app. code invoked by the latter may close the socket, clearing
* the former flag */
if ((pollfds.entries[i].revents & POLLIN) != 0) {
struct st_h2o_evloop_socket_t *sock = loop->socks.entries[pollfds.entries[i].fd];
assert(sock != NULL);
assert(sock->fd == pollfds.entries[i].fd);
if (sock->_flags != H2O_SOCKET_FLAG_IS_DISPOSED) {
sock->_flags |= H2O_SOCKET_FLAG_IS_READ_READY;
link_to_pending(sock);
DEBUG_LOG("added fd %d as read_ready\n", sock->fd);
}
}
if ((pollfds.entries[i].revents & POLLOUT) != 0) {
struct st_h2o_evloop_socket_t *sock = loop->socks.entries[pollfds.entries[i].fd];
assert(sock != NULL);
assert(sock->fd == pollfds.entries[i].fd);
if (sock->_flags != H2O_SOCKET_FLAG_IS_DISPOSED) {
DEBUG_LOG("handling pending writes on fd %d\n", fd);
write_pending(sock);
}
}
}
ret = 0;
}
Exit:
free(pollfds.entries);
return ret;
}
static void evloop_do_on_socket_create(struct st_h2o_evloop_socket_t *sock)
{
struct st_h2o_evloop_poll_t *loop = (struct st_h2o_evloop_poll_t *)sock->loop;
if (sock->fd >= loop->socks.size) {
h2o_vector_reserve(NULL, &loop->socks, sock->fd + 1);
memset(loop->socks.entries + loop->socks.size, 0, (sock->fd + 1 - loop->socks.size) * sizeof(loop->socks.entries[0]));
loop->socks.size = sock->fd + 1;
}
if (loop->socks.entries[sock->fd] != NULL)
assert(loop->socks.entries[sock->fd]->_flags == H2O_SOCKET_FLAG_IS_DISPOSED);
}
static void evloop_do_on_socket_close(struct st_h2o_evloop_socket_t *sock)
{
struct st_h2o_evloop_poll_t *loop = (struct st_h2o_evloop_poll_t *)sock->loop;
if (sock->fd != -1)
loop->socks.entries[sock->fd] = NULL;
}
static void evloop_do_on_socket_export(struct st_h2o_evloop_socket_t *sock)
{
struct st_h2o_evloop_poll_t *loop = (struct st_h2o_evloop_poll_t *)sock->loop;
evloop_do_on_socket_close(sock);
loop->socks.entries[sock->fd] = NULL;
}
h2o_evloop_t *h2o_evloop_create(void)
{
struct st_h2o_evloop_poll_t *loop = (struct st_h2o_evloop_poll_t *)create_evloop(sizeof(*loop));
return &loop->super;
}
|
