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1 | /***************************************************************************** |
2 | Copyright (c) 2006 EMC Corporation. | |
3 | Copyright (c) 2011 Factor-SPE | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by the Free | |
7 | Software Foundation; either version 2 of the License, or (at your option) | |
8 | any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License along with | |
16 | this program; if not, write to the Free Software Foundation, Inc., 59 | |
17 | Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | ||
19 | The full GNU General Public License is included in this distribution in the | |
20 | file called LICENSE. | |
21 | ||
22 | Authors: Srinivas Aji <Aji_Srinivas@emc.com> | |
23 | Authors: Vitalii Demianets <vitas@nppfactor.kiev.ua> | |
24 | ||
25 | ******************************************************************************/ | |
26 | ||
27 | #include <stdio.h> | |
28 | #include <unistd.h> | |
29 | ||
30 | #include "epoll_loop.h" | |
31 | #include "bridge_ctl.h" | |
32 | ||
33 | /* globals */ | |
34 | static int epoll_fd = -1; | |
35 | static struct timeval nexttimeout; | |
36 | ||
37 | int init_epoll(void) | |
38 | { | |
39 | int r = epoll_create(128); | |
40 | if(r < 0) | |
41 | { | |
42 | fprintf(stderr, "epoll_create failed: %m\n"); | |
43 | return -1; | |
44 | } | |
45 | epoll_fd = r; | |
46 | return 0; | |
47 | } | |
48 | ||
49 | int add_epoll(struct epoll_event_handler *h) | |
50 | { | |
51 | struct epoll_event ev = | |
52 | { | |
53 | .events = EPOLLIN, | |
54 | .data.ptr = h, | |
55 | }; | |
56 | h->ref_ev = NULL; | |
57 | int r = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, h->fd, &ev); | |
58 | if(r < 0) | |
59 | { | |
60 | fprintf(stderr, "epoll_ctl_add: %m\n"); | |
61 | return -1; | |
62 | } | |
63 | return 0; | |
64 | } | |
65 | ||
66 | int remove_epoll(struct epoll_event_handler *h) | |
67 | { | |
68 | int r = epoll_ctl(epoll_fd, EPOLL_CTL_DEL, h->fd, NULL); | |
69 | if(r < 0) | |
70 | { | |
71 | fprintf(stderr, "epoll_ctl_del: %m\n"); | |
72 | return -1; | |
73 | } | |
74 | if(h->ref_ev && h->ref_ev->data.ptr == h) | |
75 | { | |
76 | h->ref_ev->data.ptr = NULL; | |
77 | h->ref_ev = NULL; | |
78 | } | |
79 | return 0; | |
80 | } | |
81 | ||
82 | void clear_epoll(void) | |
83 | { | |
84 | if(epoll_fd >= 0) | |
85 | close(epoll_fd); | |
86 | } | |
87 | ||
88 | static inline int time_diff(struct timeval *second, struct timeval *first) | |
89 | { | |
90 | return (second->tv_sec - first->tv_sec) * 1000 | |
91 | + (second->tv_usec - first->tv_usec) / 1000; | |
92 | } | |
93 | ||
94 | static inline void run_timeouts(void) | |
95 | { | |
96 | bridge_one_second(); | |
97 | ++(nexttimeout.tv_sec); | |
98 | } | |
99 | ||
100 | int epoll_main_loop(void) | |
101 | { | |
102 | gettimeofday(&nexttimeout, NULL); | |
103 | ++(nexttimeout.tv_sec); | |
104 | #define EV_SIZE 8 | |
105 | struct epoll_event ev[EV_SIZE]; | |
106 | ||
107 | while(1) | |
108 | { | |
109 | int r, i; | |
110 | int timeout; | |
111 | ||
112 | struct timeval tv; | |
113 | gettimeofday(&tv, NULL); | |
114 | timeout = time_diff(&nexttimeout, &tv); | |
115 | if(timeout < 0) | |
116 | { | |
117 | run_timeouts(); | |
118 | timeout = 0; | |
119 | } | |
120 | ||
121 | r = epoll_wait(epoll_fd, ev, EV_SIZE, timeout); | |
122 | if(r < 0 && errno != EINTR) | |
123 | { | |
124 | fprintf(stderr, "epoll_wait: %m\n"); | |
125 | return -1; | |
126 | } | |
127 | for(i = 0; i < r; ++i) | |
128 | { | |
129 | struct epoll_event_handler *p = ev[i].data.ptr; | |
130 | if(p != NULL) | |
131 | p->ref_ev = &ev[i]; | |
132 | } | |
133 | for (i = 0; i < r; ++i) | |
134 | { | |
135 | struct epoll_event_handler *p = ev[i].data.ptr; | |
136 | if(p && p->handler) | |
137 | p->handler(ev[i].events, p); | |
138 | } | |
139 | for (i = 0; i < r; ++i) | |
140 | { | |
141 | struct epoll_event_handler *p = ev[i].data.ptr; | |
142 | if(p != NULL) | |
143 | p->ref_ev = NULL; | |
144 | } | |
145 | } | |
146 | ||
147 | return 0; | |
148 | } |