1 /* Kqueue(2)-based ae.c module
2 *
3 * Copyright (C) 2009 Harish Mallipeddi - [email protected]
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * * Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * * Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * * Neither the name of Redis nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without
16 * specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31
32 #include <sys/types.h>
33 #include <sys/event.h>
34 #include <sys/time.h>
35
36 typedef struct aeApiState {
37 int kqfd;
38 struct kevent *events;
39 } aeApiState;
40
aeApiCreate(aeEventLoop * eventLoop)41 static int aeApiCreate(aeEventLoop *eventLoop) {
42 aeApiState *state = zmalloc(sizeof(aeApiState));
43
44 if (!state) return -1;
45 state->events = zmalloc(sizeof(struct kevent)*eventLoop->setsize);
46 if (!state->events) {
47 zfree(state);
48 return -1;
49 }
50 state->kqfd = kqueue();
51 if (state->kqfd == -1) {
52 zfree(state->events);
53 zfree(state);
54 return -1;
55 }
56 eventLoop->apidata = state;
57 return 0;
58 }
59
aeApiResize(aeEventLoop * eventLoop,int setsize)60 static int aeApiResize(aeEventLoop *eventLoop, int setsize) {
61 aeApiState *state = eventLoop->apidata;
62
63 state->events = zrealloc(state->events, sizeof(struct kevent)*setsize);
64 return 0;
65 }
66
aeApiFree(aeEventLoop * eventLoop)67 static void aeApiFree(aeEventLoop *eventLoop) {
68 aeApiState *state = eventLoop->apidata;
69
70 close(state->kqfd);
71 zfree(state->events);
72 zfree(state);
73 }
74
aeApiAddEvent(aeEventLoop * eventLoop,int fd,int mask)75 static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) {
76 aeApiState *state = eventLoop->apidata;
77 struct kevent ke;
78
79 if (mask & AE_READABLE) {
80 EV_SET(&ke, fd, EVFILT_READ, EV_ADD, 0, 0, NULL);
81 if (kevent(state->kqfd, &ke, 1, NULL, 0, NULL) == -1) return -1;
82 }
83 if (mask & AE_WRITABLE) {
84 EV_SET(&ke, fd, EVFILT_WRITE, EV_ADD, 0, 0, NULL);
85 if (kevent(state->kqfd, &ke, 1, NULL, 0, NULL) == -1) return -1;
86 }
87 return 0;
88 }
89
aeApiDelEvent(aeEventLoop * eventLoop,int fd,int mask)90 static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int mask) {
91 aeApiState *state = eventLoop->apidata;
92 struct kevent ke;
93
94 if (mask & AE_READABLE) {
95 EV_SET(&ke, fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
96 kevent(state->kqfd, &ke, 1, NULL, 0, NULL);
97 }
98 if (mask & AE_WRITABLE) {
99 EV_SET(&ke, fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
100 kevent(state->kqfd, &ke, 1, NULL, 0, NULL);
101 }
102 }
103
aeApiPoll(aeEventLoop * eventLoop,struct timeval * tvp)104 static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp) {
105 aeApiState *state = eventLoop->apidata;
106 int retval, numevents = 0;
107
108 if (tvp != NULL) {
109 struct timespec timeout;
110 timeout.tv_sec = tvp->tv_sec;
111 timeout.tv_nsec = tvp->tv_usec * 1000;
112 retval = kevent(state->kqfd, NULL, 0, state->events, eventLoop->setsize,
113 &timeout);
114 } else {
115 retval = kevent(state->kqfd, NULL, 0, state->events, eventLoop->setsize,
116 NULL);
117 }
118
119 if (retval > 0) {
120 int j;
121
122 numevents = retval;
123 for(j = 0; j < numevents; j++) {
124 int mask = 0;
125 struct kevent *e = state->events+j;
126
127 if (e->filter == EVFILT_READ) mask |= AE_READABLE;
128 if (e->filter == EVFILT_WRITE) mask |= AE_WRITABLE;
129 eventLoop->fired[j].fd = e->ident;
130 eventLoop->fired[j].mask = mask;
131 }
132 }
133 return numevents;
134 }
135
aeApiName(void)136 static char *aeApiName(void) {
137 return "kqueue";
138 }
139