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author | Drew DeVault <sir@cmpwn.com> | 2018-10-14 16:34:22 +0200 |
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committer | GitHub <noreply@github.com> | 2018-10-14 16:34:22 +0200 |
commit | 53d90dd6a82205a20c3e97a8a396048588e1b5ef (patch) | |
tree | 10f5596fd0d90711af66281c38780c5a1d4d724f /common/loop.c | |
parent | Update README.MD (and README.*.md) (diff) | |
parent | Event loop: Fix memmove and remove extraneous declaration (diff) | |
download | sway-53d90dd6a82205a20c3e97a8a396048588e1b5ef.tar.gz sway-53d90dd6a82205a20c3e97a8a396048588e1b5ef.tar.zst sway-53d90dd6a82205a20c3e97a8a396048588e1b5ef.zip |
Merge pull request #2826 from RyanDwyer/common-eventloop
Implement common event loop for swaybar and swaylock
Diffstat (limited to 'common/loop.c')
-rw-r--r-- | common/loop.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/common/loop.c b/common/loop.c new file mode 100644 index 00000000..1b174967 --- /dev/null +++ b/common/loop.c | |||
@@ -0,0 +1,179 @@ | |||
1 | #include <limits.h> | ||
2 | #include <string.h> | ||
3 | #include <stdbool.h> | ||
4 | #include <stdlib.h> | ||
5 | #include <stdio.h> | ||
6 | #include <poll.h> | ||
7 | #include <time.h> | ||
8 | #include <unistd.h> | ||
9 | #include "list.h" | ||
10 | #include "log.h" | ||
11 | #include "loop.h" | ||
12 | |||
13 | struct loop_fd_event { | ||
14 | void (*callback)(int fd, short mask, void *data); | ||
15 | void *data; | ||
16 | }; | ||
17 | |||
18 | struct loop_timer { | ||
19 | void (*callback)(void *data); | ||
20 | void *data; | ||
21 | struct timespec expiry; | ||
22 | }; | ||
23 | |||
24 | struct loop { | ||
25 | struct pollfd *fds; | ||
26 | int fd_length; | ||
27 | int fd_capacity; | ||
28 | |||
29 | list_t *fd_events; // struct loop_fd_event | ||
30 | list_t *timers; // struct loop_timer | ||
31 | }; | ||
32 | |||
33 | struct loop *loop_create(void) { | ||
34 | struct loop *loop = calloc(1, sizeof(struct loop)); | ||
35 | if (!loop) { | ||
36 | wlr_log(WLR_ERROR, "Unable to allocate memory for loop"); | ||
37 | return NULL; | ||
38 | } | ||
39 | loop->fd_capacity = 10; | ||
40 | loop->fds = malloc(sizeof(struct pollfd) * loop->fd_capacity); | ||
41 | loop->fd_events = create_list(); | ||
42 | loop->timers = create_list(); | ||
43 | return loop; | ||
44 | } | ||
45 | |||
46 | void loop_destroy(struct loop *loop) { | ||
47 | list_foreach(loop->fd_events, free); | ||
48 | list_foreach(loop->timers, free); | ||
49 | list_free(loop->fd_events); | ||
50 | list_free(loop->timers); | ||
51 | free(loop->fds); | ||
52 | free(loop); | ||
53 | } | ||
54 | |||
55 | void loop_poll(struct loop *loop) { | ||
56 | // Calculate next timer in ms | ||
57 | int ms = INT_MAX; | ||
58 | if (loop->timers->length) { | ||
59 | struct timespec now; | ||
60 | clock_gettime(CLOCK_MONOTONIC, &now); | ||
61 | for (int i = 0; i < loop->timers->length; ++i) { | ||
62 | struct loop_timer *timer = loop->timers->items[i]; | ||
63 | int timer_ms = (timer->expiry.tv_sec - now.tv_sec) * 1000; | ||
64 | timer_ms += (timer->expiry.tv_nsec - now.tv_nsec) / 1000000; | ||
65 | if (timer_ms < ms) { | ||
66 | ms = timer_ms; | ||
67 | } | ||
68 | } | ||
69 | } | ||
70 | if (ms < 0) { | ||
71 | ms = 0; | ||
72 | } | ||
73 | |||
74 | poll(loop->fds, loop->fd_length, ms); | ||
75 | |||
76 | // Dispatch fds | ||
77 | for (int i = 0; i < loop->fd_length; ++i) { | ||
78 | struct pollfd pfd = loop->fds[i]; | ||
79 | struct loop_fd_event *event = loop->fd_events->items[i]; | ||
80 | |||
81 | // Always send these events | ||
82 | unsigned events = pfd.events | POLLHUP | POLLERR; | ||
83 | |||
84 | if (pfd.revents & events) { | ||
85 | event->callback(pfd.fd, pfd.revents, event->data); | ||
86 | } | ||
87 | } | ||
88 | |||
89 | // Dispatch timers | ||
90 | if (loop->timers->length) { | ||
91 | struct timespec now; | ||
92 | clock_gettime(CLOCK_MONOTONIC, &now); | ||
93 | for (int i = 0; i < loop->timers->length; ++i) { | ||
94 | struct loop_timer *timer = loop->timers->items[i]; | ||
95 | bool expired = timer->expiry.tv_sec < now.tv_sec || | ||
96 | (timer->expiry.tv_sec == now.tv_sec && | ||
97 | timer->expiry.tv_nsec < now.tv_nsec); | ||
98 | if (expired) { | ||
99 | timer->callback(timer->data); | ||
100 | loop_remove_timer(loop, timer); | ||
101 | --i; | ||
102 | } | ||
103 | } | ||
104 | } | ||
105 | } | ||
106 | |||
107 | void loop_add_fd(struct loop *loop, int fd, short mask, | ||
108 | void (*callback)(int fd, short mask, void *data), void *data) { | ||
109 | struct loop_fd_event *event = calloc(1, sizeof(struct loop_fd_event)); | ||
110 | if (!event) { | ||
111 | wlr_log(WLR_ERROR, "Unable to allocate memory for event"); | ||
112 | return; | ||
113 | } | ||
114 | event->callback = callback; | ||
115 | event->data = data; | ||
116 | list_add(loop->fd_events, event); | ||
117 | |||
118 | struct pollfd pfd = {fd, mask, 0}; | ||
119 | |||
120 | if (loop->fd_length == loop->fd_capacity) { | ||
121 | loop->fd_capacity += 10; | ||
122 | loop->fds = realloc(loop->fds, | ||
123 | sizeof(struct pollfd) * loop->fd_capacity); | ||
124 | } | ||
125 | |||
126 | loop->fds[loop->fd_length++] = pfd; | ||
127 | } | ||
128 | |||
129 | struct loop_timer *loop_add_timer(struct loop *loop, int ms, | ||
130 | void (*callback)(void *data), void *data) { | ||
131 | struct loop_timer *timer = calloc(1, sizeof(struct loop_timer)); | ||
132 | if (!timer) { | ||
133 | wlr_log(WLR_ERROR, "Unable to allocate memory for timer"); | ||
134 | return NULL; | ||
135 | } | ||
136 | timer->callback = callback; | ||
137 | timer->data = data; | ||
138 | |||
139 | clock_gettime(CLOCK_MONOTONIC, &timer->expiry); | ||
140 | timer->expiry.tv_sec += ms / 1000; | ||
141 | |||
142 | long int nsec = (ms % 1000) * 1000000; | ||
143 | if (timer->expiry.tv_nsec + nsec >= 1000000000) { | ||
144 | timer->expiry.tv_sec++; | ||
145 | nsec -= 1000000000; | ||
146 | } | ||
147 | timer->expiry.tv_nsec += nsec; | ||
148 | |||
149 | list_add(loop->timers, timer); | ||
150 | |||
151 | return timer; | ||
152 | } | ||
153 | |||
154 | bool loop_remove_fd(struct loop *loop, int fd) { | ||
155 | for (int i = 0; i < loop->fd_length; ++i) { | ||
156 | if (loop->fds[i].fd == fd) { | ||
157 | free(loop->fd_events->items[i]); | ||
158 | list_del(loop->fd_events, i); | ||
159 | |||
160 | loop->fd_length--; | ||
161 | memmove(&loop->fds[i], &loop->fds[i + 1], | ||
162 | sizeof(struct pollfd) * (loop->fd_length - i)); | ||
163 | |||
164 | return true; | ||
165 | } | ||
166 | } | ||
167 | return false; | ||
168 | } | ||
169 | |||
170 | bool loop_remove_timer(struct loop *loop, struct loop_timer *timer) { | ||
171 | for (int i = 0; i < loop->timers->length; ++i) { | ||
172 | if (loop->timers->items[i] == timer) { | ||
173 | list_del(loop->timers, i); | ||
174 | free(timer); | ||
175 | return true; | ||
176 | } | ||
177 | } | ||
178 | return false; | ||
179 | } | ||