1 | /* |
1 | /* |
2 | * libev epoll fd activity backend |
2 | * libev poll fd activity backend |
3 | * |
3 | * |
4 | * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
4 | * Copyright (c) 2007,2008,2009,2010,2011,2016,2019 Marc Alexander Lehmann <libev@schmorp.de> |
5 | * All rights reserved. |
5 | * All rights reserved. |
6 | * |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * modification, are permitted provided that the following conditions are |
8 | * tion, are permitted provided that the following conditions are met: |
9 | * met: |
|
|
10 | * |
9 | * |
11 | * * Redistributions of source code must retain the above copyright |
10 | * 1. Redistributions of source code must retain the above copyright notice, |
12 | * notice, this list of conditions and the following disclaimer. |
11 | * this list of conditions and the following disclaimer. |
13 | * |
12 | * |
14 | * * Redistributions in binary form must reproduce the above |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
15 | * copyright notice, this list of conditions and the following |
14 | * notice, this list of conditions and the following disclaimer in the |
16 | * disclaimer in the documentation and/or other materials provided |
15 | * documentation and/or other materials provided with the distribution. |
17 | * with the distribution. |
|
|
18 | * |
16 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
|
|
24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
|
|
27 | * |
|
|
28 | * Alternatively, the contents of this file may be used under the terms of |
|
|
29 | * the GNU General Public License ("GPL") version 2 or any later version, |
|
|
30 | * in which case the provisions of the GPL are applicable instead of |
|
|
31 | * the above. If you wish to allow the use of your version of this file |
|
|
32 | * only under the terms of the GPL and not to allow others to use your |
|
|
33 | * version of this file under the BSD license, indicate your decision |
|
|
34 | * by deleting the provisions above and replace them with the notice |
|
|
35 | * and other provisions required by the GPL. If you do not delete the |
|
|
36 | * provisions above, a recipient may use your version of this file under |
|
|
37 | * either the BSD or the GPL. |
30 | */ |
38 | */ |
31 | |
39 | |
32 | #include <poll.h> |
40 | #include <poll.h> |
33 | |
41 | |
34 | static void |
42 | inline_size |
|
|
43 | void |
35 | pollidx_init (int *base, int count) |
44 | pollidx_init (int *base, int count) |
36 | { |
45 | { |
|
|
46 | /* consider using memset (.., -1, ...), which is practically guaranteed |
|
|
47 | * to work on all systems implementing poll */ |
37 | while (count--) |
48 | while (count--) |
38 | *base++ = -1; |
49 | *base++ = -1; |
39 | } |
50 | } |
40 | |
51 | |
41 | static void |
52 | static void |
… | |
… | |
50 | |
61 | |
51 | idx = pollidxs [fd]; |
62 | idx = pollidxs [fd]; |
52 | |
63 | |
53 | if (idx < 0) /* need to allocate a new pollfd */ |
64 | if (idx < 0) /* need to allocate a new pollfd */ |
54 | { |
65 | { |
55 | idx = pollcnt++; |
66 | pollidxs [fd] = idx = pollcnt++; |
56 | array_needsize (struct pollfd, polls, pollmax, pollcnt, ); |
67 | array_needsize (struct pollfd, polls, pollmax, pollcnt, array_needsize_noinit); |
57 | polls [idx].fd = fd; |
68 | polls [idx].fd = fd; |
58 | } |
69 | } |
|
|
70 | |
|
|
71 | assert (polls [idx].fd == fd); |
59 | |
72 | |
60 | if (nev) |
73 | if (nev) |
61 | polls [idx].events = |
74 | polls [idx].events = |
62 | (nev & EV_READ ? POLLIN : 0) |
75 | (nev & EV_READ ? POLLIN : 0) |
63 | | (nev & EV_WRITE ? POLLOUT : 0); |
76 | | (nev & EV_WRITE ? POLLOUT : 0); |
64 | else /* remove pollfd */ |
77 | else /* remove pollfd */ |
65 | { |
78 | { |
66 | if (idx < pollcnt--) |
79 | pollidxs [fd] = -1; |
|
|
80 | |
|
|
81 | if (expect_true (idx < --pollcnt)) |
67 | { |
82 | { |
68 | pollidxs [fd] = -1; |
|
|
69 | polls [idx] = polls [pollcnt]; |
83 | polls [idx] = polls [pollcnt]; |
70 | pollidxs [polls [idx].fd] = idx; |
84 | pollidxs [polls [idx].fd] = idx; |
71 | } |
85 | } |
72 | } |
86 | } |
73 | } |
87 | } |
74 | |
88 | |
75 | static void |
89 | static void |
76 | poll_poll (EV_P_ ev_tstamp timeout) |
90 | poll_poll (EV_P_ ev_tstamp timeout) |
77 | { |
91 | { |
|
|
92 | struct pollfd *p; |
78 | int i; |
93 | int res; |
|
|
94 | |
|
|
95 | EV_RELEASE_CB; |
79 | int res = poll (polls, pollcnt, ceil (timeout * 1000.)); |
96 | res = poll (polls, pollcnt, timeout * 1e3); |
|
|
97 | EV_ACQUIRE_CB; |
80 | |
98 | |
81 | if (res < 0) |
99 | if (expect_false (res < 0)) |
82 | { |
100 | { |
83 | if (errno == EBADF) |
101 | if (errno == EBADF) |
84 | fd_ebadf (EV_A); |
102 | fd_ebadf (EV_A); |
85 | else if (errno == ENOMEM && !syserr_cb) |
103 | else if (errno == ENOMEM && !syserr_cb) |
86 | fd_enomem (EV_A); |
104 | fd_enomem (EV_A); |
87 | else if (errno != EINTR) |
105 | else if (errno != EINTR) |
88 | syserr ("(libev) poll"); |
106 | ev_syserr ("(libev) poll"); |
|
|
107 | } |
|
|
108 | else |
|
|
109 | for (p = polls; res; ++p) |
|
|
110 | { |
|
|
111 | assert (("libev: poll() returned illegal result, broken BSD kernel?", p < polls + pollcnt)); |
89 | |
112 | |
90 | return; |
113 | if (expect_false (p->revents)) /* this expect is debatable */ |
91 | } |
114 | { |
|
|
115 | --res; |
92 | |
116 | |
93 | for (i = 0; i < pollcnt; ++i) |
117 | if (expect_false (p->revents & POLLNVAL)) |
94 | fd_event ( |
118 | fd_kill (EV_A_ p->fd); |
95 | EV_A_ |
119 | else |
96 | polls [i].fd, |
120 | fd_event ( |
|
|
121 | EV_A_ |
|
|
122 | p->fd, |
97 | (polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
123 | (p->revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
98 | | (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
124 | | (p->revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
99 | ); |
125 | ); |
|
|
126 | } |
|
|
127 | } |
100 | } |
128 | } |
101 | |
129 | |
102 | static int |
130 | inline_size |
|
|
131 | int |
103 | poll_init (EV_P_ int flags) |
132 | poll_init (EV_P_ int flags) |
104 | { |
133 | { |
105 | method_fudge = 1e-3; /* needed to compensate for select returning early, very conservative */ |
134 | backend_mintime = 1e-3; |
106 | method_modify = poll_modify; |
135 | backend_modify = poll_modify; |
107 | method_poll = poll_poll; |
136 | backend_poll = poll_poll; |
108 | |
137 | |
109 | pollidxs = 0; pollidxmax = 0; |
138 | pollidxs = 0; pollidxmax = 0; |
110 | polls = 0; pollmax = 0; pollcnt = 0; |
139 | polls = 0; pollmax = 0; pollcnt = 0; |
111 | |
140 | |
112 | return EVMETHOD_POLL; |
141 | return EVBACKEND_POLL; |
113 | } |
142 | } |
114 | |
143 | |
115 | static void |
144 | inline_size |
|
|
145 | void |
116 | poll_destroy (EV_P) |
146 | poll_destroy (EV_P) |
117 | { |
147 | { |
118 | ev_free (pollidxs); |
148 | ev_free (pollidxs); |
119 | ev_free (polls); |
149 | ev_free (polls); |
120 | } |
150 | } |