1 /*
2 * Copyright (c) 2014 DeNA Co., Ltd.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to
6 * deal in the Software without restriction, including without limitation the
7 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
8 * sell copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
20 * IN THE SOFTWARE.
21 */
22 #include <assert.h>
23 #include <stdio.h>
24 #include <sys/types.h>
25 #include <sys/event.h>
26 #include <sys/time.h>
27
28 #if 0
29 #define DEBUG_LOG(...) h2o_error_printf(__VA_ARGS__)
30 #else
31 #define DEBUG_LOG(...)
32 #endif
33
34 struct st_h2o_socket_loop_kqueue_t {
35 h2o_evloop_t super;
36 int kq;
37 };
38
ev_set(struct kevent * ev,int fd,int filter,int flags,struct st_h2o_evloop_socket_t * sock)39 static void ev_set(struct kevent *ev, int fd, int filter, int flags, struct st_h2o_evloop_socket_t *sock)
40 {
41 #ifdef __NetBSD__
42 EV_SET(ev, fd, filter, flags, 0, 0, (intptr_t)sock);
43 #else
44 EV_SET(ev, fd, filter, flags, 0, 0, sock);
45 #endif
46 }
47
collect_status(struct st_h2o_socket_loop_kqueue_t * loop,struct kevent * changelist,int changelist_capacity)48 static int collect_status(struct st_h2o_socket_loop_kqueue_t *loop, struct kevent *changelist, int changelist_capacity)
49 {
50 int change_index = 0;
51
52 #define SET_AND_UPDATE(filter, flags) \
53 do { \
54 ev_set(changelist + change_index++, sock->fd, filter, flags, sock); \
55 if (change_index == changelist_capacity) { \
56 int ret; \
57 while ((ret = kevent(loop->kq, changelist, change_index, NULL, 0, NULL)) != 0 && errno == EINTR) \
58 ; \
59 if (ret == -1) \
60 return -1; \
61 change_index = 0; \
62 } \
63 } while (0)
64
65 while (loop->super._statechanged.head != NULL) {
66 /* detach the top */
67 struct st_h2o_evloop_socket_t *sock = loop->super._statechanged.head;
68 loop->super._statechanged.head = sock->_next_statechanged;
69 sock->_next_statechanged = sock;
70 /* update the state */
71 if ((sock->_flags & H2O_SOCKET_FLAG_IS_DISPOSED) != 0) {
72 free(sock);
73 } else {
74 if (h2o_socket_is_reading(&sock->super)) {
75 if ((sock->_flags & H2O_SOCKET_FLAG_IS_POLLED_FOR_READ) == 0) {
76 sock->_flags |= H2O_SOCKET_FLAG_IS_POLLED_FOR_READ;
77 SET_AND_UPDATE(EVFILT_READ, EV_ADD);
78 }
79 } else {
80 if ((sock->_flags & H2O_SOCKET_FLAG_IS_POLLED_FOR_READ) != 0) {
81 sock->_flags &= ~H2O_SOCKET_FLAG_IS_POLLED_FOR_READ;
82 SET_AND_UPDATE(EVFILT_READ, EV_DELETE);
83 }
84 }
85 if (h2o_socket_is_writing(&sock->super)) {
86 if ((sock->_flags & H2O_SOCKET_FLAG_IS_POLLED_FOR_WRITE) == 0) {
87 sock->_flags |= H2O_SOCKET_FLAG_IS_POLLED_FOR_WRITE;
88 SET_AND_UPDATE(EVFILT_WRITE, EV_ADD);
89 }
90 } else {
91 if ((sock->_flags & H2O_SOCKET_FLAG_IS_POLLED_FOR_WRITE) != 0) {
92 sock->_flags &= ~H2O_SOCKET_FLAG_IS_POLLED_FOR_WRITE;
93 SET_AND_UPDATE(EVFILT_WRITE, EV_DELETE);
94 }
95 }
96 }
97 }
98 loop->super._statechanged.tail_ref = &loop->super._statechanged.head;
99
100 return change_index;
101
102 #undef SET_AND_UPDATE
103 }
104
evloop_do_proceed(h2o_evloop_t * _loop,int32_t max_wait)105 int evloop_do_proceed(h2o_evloop_t *_loop, int32_t max_wait)
106 {
107 struct st_h2o_socket_loop_kqueue_t *loop = (struct st_h2o_socket_loop_kqueue_t *)_loop;
108 struct kevent changelist[64], events[128];
109 int nchanges, nevents, i;
110 struct timespec ts;
111
112 /* collect (and update) status */
113 if ((nchanges = collect_status(loop, changelist, sizeof(changelist) / sizeof(changelist[0]))) == -1)
114 return -1;
115
116 /* poll */
117 max_wait = adjust_max_wait(&loop->super, max_wait);
118 ts.tv_sec = max_wait / 1000;
119 ts.tv_nsec = max_wait % 1000 * 1000 * 1000;
120 nevents = kevent(loop->kq, changelist, nchanges, events, sizeof(events) / sizeof(events[0]), &ts);
121
122 update_now(&loop->super);
123 if (nevents == -1)
124 return -1;
125
126 if (nevents != 0) {
127 h2o_sliding_counter_start(&loop->super.exec_time_nanosec_counter, loop->super._now_nanosec);
128 }
129
130 /* update readable flags, perform writes */
131 for (i = 0; i != nevents; ++i) {
132 struct st_h2o_evloop_socket_t *sock = (void *)events[i].udata;
133 assert(sock->fd == events[i].ident);
134 switch (events[i].filter) {
135 case EVFILT_READ:
136 if (sock->_flags != H2O_SOCKET_FLAG_IS_DISPOSED) {
137 sock->_flags |= H2O_SOCKET_FLAG_IS_READ_READY;
138 link_to_pending(sock);
139 }
140 break;
141 case EVFILT_WRITE:
142 if (sock->_flags != H2O_SOCKET_FLAG_IS_DISPOSED) {
143 write_pending(sock);
144 }
145 break;
146 default:
147 break; /* ??? */
148 }
149 }
150
151 return 0;
152 }
153
evloop_do_on_socket_create(struct st_h2o_evloop_socket_t * sock)154 static void evloop_do_on_socket_create(struct st_h2o_evloop_socket_t *sock)
155 {
156 }
157
evloop_do_on_socket_close(struct st_h2o_evloop_socket_t * sock)158 static void evloop_do_on_socket_close(struct st_h2o_evloop_socket_t *sock)
159 {
160 }
161
evloop_do_on_socket_export(struct st_h2o_evloop_socket_t * sock)162 static void evloop_do_on_socket_export(struct st_h2o_evloop_socket_t *sock)
163 {
164 struct st_h2o_socket_loop_kqueue_t *loop = (void *)sock->loop;
165 struct kevent changelist[2];
166 int change_index = 0, ret;
167
168 if ((sock->_flags & H2O_SOCKET_FLAG_IS_POLLED_FOR_READ) != 0)
169 ev_set(changelist + change_index++, sock->fd, EVFILT_READ, EV_DELETE, 0);
170 if ((sock->_flags & H2O_SOCKET_FLAG_IS_POLLED_FOR_WRITE) != 0)
171 ev_set(changelist + change_index++, sock->fd, EVFILT_WRITE, EV_DELETE, 0);
172 if (change_index == 0)
173 return;
174 while ((ret = kevent(loop->kq, changelist, change_index, NULL, 0, NULL)) != 0 && errno == EINTR)
175 ;
176 if (ret == -1)
177 h2o_error_printf("kevent returned error %d (fd=%d)", errno, sock->fd);
178 }
179
evloop_do_dispose(h2o_evloop_t * _loop)180 static void evloop_do_dispose(h2o_evloop_t *_loop)
181 {
182 struct st_h2o_socket_loop_kqueue_t *loop = (struct st_h2o_socket_loop_kqueue_t *)_loop;
183 close(loop->kq);
184 }
185
h2o_evloop_create(void)186 h2o_evloop_t *h2o_evloop_create(void)
187 {
188 struct st_h2o_socket_loop_kqueue_t *loop = (struct st_h2o_socket_loop_kqueue_t *)create_evloop(sizeof(*loop));
189
190 loop->kq = kqueue();
191
192 return &loop->super;
193 }
194