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4365e5b2 | 1 | /* Select()-based ae.c module. |
2 | * | |
3 | * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com> | |
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 | ||
a51dcb8b | 31 | |
32 | #include <string.h> | |
33 | ||
34 | typedef struct aeApiState { | |
621d5c19 | 35 | fd_set rfds, wfds; |
a51dcb8b | 36 | /* We need to have a copy of the fd sets as it's not safe to reuse |
37 | * FD sets after select(). */ | |
621d5c19 | 38 | fd_set _rfds, _wfds; |
a51dcb8b | 39 | } aeApiState; |
40 | ||
41 | static int aeApiCreate(aeEventLoop *eventLoop) { | |
42 | aeApiState *state = zmalloc(sizeof(aeApiState)); | |
43 | ||
44 | if (!state) return -1; | |
45 | FD_ZERO(&state->rfds); | |
46 | FD_ZERO(&state->wfds); | |
a51dcb8b | 47 | eventLoop->apidata = state; |
48 | return 0; | |
49 | } | |
50 | ||
51 | static void aeApiFree(aeEventLoop *eventLoop) { | |
52 | zfree(eventLoop->apidata); | |
53 | } | |
54 | ||
55 | static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) { | |
56 | aeApiState *state = eventLoop->apidata; | |
57 | ||
58 | if (mask & AE_READABLE) FD_SET(fd,&state->rfds); | |
59 | if (mask & AE_WRITABLE) FD_SET(fd,&state->wfds); | |
a51dcb8b | 60 | return 0; |
61 | } | |
62 | ||
63 | static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int mask) { | |
64 | aeApiState *state = eventLoop->apidata; | |
65 | ||
66 | if (mask & AE_READABLE) FD_CLR(fd,&state->rfds); | |
67 | if (mask & AE_WRITABLE) FD_CLR(fd,&state->wfds); | |
a51dcb8b | 68 | } |
69 | ||
70 | static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp) { | |
71 | aeApiState *state = eventLoop->apidata; | |
72 | int retval, j, numevents = 0; | |
73 | ||
74 | memcpy(&state->_rfds,&state->rfds,sizeof(fd_set)); | |
75 | memcpy(&state->_wfds,&state->wfds,sizeof(fd_set)); | |
a51dcb8b | 76 | |
77 | retval = select(eventLoop->maxfd+1, | |
621d5c19 | 78 | &state->_rfds,&state->_wfds,NULL,tvp); |
a51dcb8b | 79 | if (retval > 0) { |
80 | for (j = 0; j <= eventLoop->maxfd; j++) { | |
81 | int mask = 0; | |
82 | aeFileEvent *fe = &eventLoop->events[j]; | |
83 | ||
84 | if (fe->mask == AE_NONE) continue; | |
85 | if (fe->mask & AE_READABLE && FD_ISSET(j,&state->_rfds)) | |
86 | mask |= AE_READABLE; | |
87 | if (fe->mask & AE_WRITABLE && FD_ISSET(j,&state->_wfds)) | |
88 | mask |= AE_WRITABLE; | |
a51dcb8b | 89 | eventLoop->fired[numevents].fd = j; |
90 | eventLoop->fired[numevents].mask = mask; | |
91 | numevents++; | |
92 | } | |
93 | } | |
94 | return numevents; | |
95 | } | |
7a932b74 | 96 | |
97 | static char *aeApiName(void) { | |
98 | return "select"; | |
99 | } |