1 /* Linux epoll(2) based ae.c module
3 * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
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.
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.
32 #include <sys/epoll.h>
34 typedef struct aeApiState
{
36 struct epoll_event
*events
;
39 static int aeApiCreate(aeEventLoop
*eventLoop
) {
40 aeApiState
*state
= zmalloc(sizeof(aeApiState
));
42 if (!state
) return -1;
43 state
->events
= zmalloc(sizeof(struct epoll_event
)*eventLoop
->setsize
);
48 state
->epfd
= epoll_create(1024); /* 1024 is just an hint for the kernel */
49 if (state
->epfd
== -1) {
54 eventLoop
->apidata
= state
;
58 static void aeApiFree(aeEventLoop
*eventLoop
) {
59 aeApiState
*state
= eventLoop
->apidata
;
66 static int aeApiAddEvent(aeEventLoop
*eventLoop
, int fd
, int mask
) {
67 aeApiState
*state
= eventLoop
->apidata
;
68 struct epoll_event ee
;
69 /* If the fd was already monitored for some event, we need a MOD
70 * operation. Otherwise we need an ADD operation. */
71 int op
= eventLoop
->events
[fd
].mask
== AE_NONE
?
72 EPOLL_CTL_ADD
: EPOLL_CTL_MOD
;
75 mask
|= eventLoop
->events
[fd
].mask
; /* Merge old events */
76 if (mask
& AE_READABLE
) ee
.events
|= EPOLLIN
;
77 if (mask
& AE_WRITABLE
) ee
.events
|= EPOLLOUT
;
78 ee
.data
.u64
= 0; /* avoid valgrind warning */
80 if (epoll_ctl(state
->epfd
,op
,fd
,&ee
) == -1) return -1;
84 static void aeApiDelEvent(aeEventLoop
*eventLoop
, int fd
, int delmask
) {
85 aeApiState
*state
= eventLoop
->apidata
;
86 struct epoll_event ee
;
87 int mask
= eventLoop
->events
[fd
].mask
& (~delmask
);
90 if (mask
& AE_READABLE
) ee
.events
|= EPOLLIN
;
91 if (mask
& AE_WRITABLE
) ee
.events
|= EPOLLOUT
;
92 ee
.data
.u64
= 0; /* avoid valgrind warning */
94 if (mask
!= AE_NONE
) {
95 epoll_ctl(state
->epfd
,EPOLL_CTL_MOD
,fd
,&ee
);
97 /* Note, Kernel < 2.6.9 requires a non null event pointer even for
99 epoll_ctl(state
->epfd
,EPOLL_CTL_DEL
,fd
,&ee
);
103 static int aeApiPoll(aeEventLoop
*eventLoop
, struct timeval
*tvp
) {
104 aeApiState
*state
= eventLoop
->apidata
;
105 int retval
, numevents
= 0;
107 retval
= epoll_wait(state
->epfd
,state
->events
,eventLoop
->setsize
,
108 tvp
? (tvp
->tv_sec
*1000 + tvp
->tv_usec
/1000) : -1);
113 for (j
= 0; j
< numevents
; j
++) {
115 struct epoll_event
*e
= state
->events
+j
;
117 if (e
->events
& EPOLLIN
) mask
|= AE_READABLE
;
118 if (e
->events
& EPOLLOUT
) mask
|= AE_WRITABLE
;
119 if (e
->events
& EPOLLERR
) mask
|= AE_WRITABLE
;
120 if (e
->events
& EPOLLHUP
) mask
|= AE_WRITABLE
;
121 eventLoop
->fired
[j
].fd
= e
->data
.fd
;
122 eventLoop
->fired
[j
].mask
= mask
;
128 static char *aeApiName(void) {