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: |
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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. |
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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, |
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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. |
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27 | * |
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28 | * Alternatively, the contents of this file may be used under the terms of |
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29 | * the GNU General Public License ("GPL") version 2 or any later version, |
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30 | * in which case the provisions of the GPL are applicable instead of |
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31 | * the above. If you wish to allow the use of your version of this file |
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32 | * only under the terms of the GPL and not to allow others to use your |
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33 | * version of this file under the BSD license, indicate your decision |
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34 | * by deleting the provisions above and replace them with the notice |
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35 | * and other provisions required by the GPL. If you do not delete the |
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36 | * provisions above, a recipient may use your version of this file under |
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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 |
35 | pollidx_init (int *base, int count) |
43 | void |
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44 | array_needsize_pollidx (int *base, int offset, int count) |
36 | { |
45 | { |
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46 | /* using memset (.., -1, ...) is tempting, we we try |
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47 | * to be ultraportable |
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48 | */ |
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49 | base += offset; |
37 | while (count--) |
50 | while (count--) |
38 | *base++ = -1; |
51 | *base++ = -1; |
39 | } |
52 | } |
40 | |
53 | |
41 | static void |
54 | static void |
42 | poll_modify (EV_P_ int fd, int oev, int nev) |
55 | poll_modify (EV_P_ int fd, int oev, int nev) |
43 | { |
56 | { |
44 | int idx; |
57 | int idx; |
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58 | |
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59 | if (oev == nev) |
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60 | return; |
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61 | |
45 | array_needsize (pollidxs, pollidxmax, fd + 1, pollidx_init); |
62 | array_needsize (int, pollidxs, pollidxmax, fd + 1, array_needsize_pollidx); |
46 | |
63 | |
47 | idx = pollidxs [fd]; |
64 | idx = pollidxs [fd]; |
48 | |
65 | |
49 | if (idx < 0) /* need to allocate a new pollfd */ |
66 | if (idx < 0) /* need to allocate a new pollfd */ |
50 | { |
67 | { |
51 | idx = pollcnt++; |
68 | pollidxs [fd] = idx = pollcnt++; |
52 | array_needsize (polls, pollmax, pollcnt, ); |
69 | array_needsize (struct pollfd, polls, pollmax, pollcnt, array_needsize_noinit); |
53 | polls [idx].fd = fd; |
70 | polls [idx].fd = fd; |
54 | } |
71 | } |
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72 | |
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73 | assert (polls [idx].fd == fd); |
55 | |
74 | |
56 | if (nev) |
75 | if (nev) |
57 | polls [idx].events = |
76 | polls [idx].events = |
58 | (nev & EV_READ ? POLLIN : 0) |
77 | (nev & EV_READ ? POLLIN : 0) |
59 | | (nev & EV_WRITE ? POLLOUT : 0); |
78 | | (nev & EV_WRITE ? POLLOUT : 0); |
60 | else /* remove pollfd */ |
79 | else /* remove pollfd */ |
61 | { |
80 | { |
62 | if (idx < pollcnt--) |
81 | pollidxs [fd] = -1; |
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82 | |
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83 | if (ecb_expect_true (idx < --pollcnt)) |
63 | { |
84 | { |
64 | pollidxs [fd] = -1; |
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65 | polls [idx] = polls [pollcnt]; |
85 | polls [idx] = polls [pollcnt]; |
66 | pollidxs [polls [idx].fd] = idx; |
86 | pollidxs [polls [idx].fd] = idx; |
67 | } |
87 | } |
68 | } |
88 | } |
69 | } |
89 | } |
70 | |
90 | |
71 | static void |
91 | static void |
72 | poll_poll (EV_P_ ev_tstamp timeout) |
92 | poll_poll (EV_P_ ev_tstamp timeout) |
73 | { |
93 | { |
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94 | struct pollfd *p; |
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95 | int res; |
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96 | |
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97 | EV_RELEASE_CB; |
74 | int res = poll (polls, pollcnt, ceil (timeout * 1000.)); |
98 | res = poll (polls, pollcnt, EV_TS_TO_MS (timeout)); |
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99 | EV_ACQUIRE_CB; |
75 | |
100 | |
76 | if (res > 0) |
101 | if (ecb_expect_false (res < 0)) |
77 | { |
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78 | int i; |
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79 | |
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80 | for (i = 0; i < pollcnt; ++i) |
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81 | fd_event ( |
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82 | EV_A_ |
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83 | polls [i].fd, |
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84 | (polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
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85 | | (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
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86 | ); |
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87 | } |
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88 | else if (res < 0) |
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89 | { |
102 | { |
90 | if (errno == EBADF) |
103 | if (errno == EBADF) |
91 | fd_ebadf (EV_A); |
104 | fd_ebadf (EV_A); |
92 | else if (errno == ENOMEM) |
105 | else if (errno == ENOMEM && !syserr_cb) |
93 | fd_enomem (EV_A); |
106 | fd_enomem (EV_A); |
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107 | else if (errno != EINTR) |
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108 | ev_syserr ("(libev) poll"); |
94 | } |
109 | } |
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110 | else |
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111 | for (p = polls; res; ++p) |
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112 | { |
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113 | assert (("libev: poll returned illegal result, broken BSD kernel?", p < polls + pollcnt)); |
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114 | |
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115 | if (ecb_expect_false (p->revents)) /* this expect is debatable */ |
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116 | { |
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117 | --res; |
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118 | |
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119 | if (ecb_expect_false (p->revents & POLLNVAL)) |
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120 | { |
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121 | assert (("libev: poll found invalid fd in poll set", 0)); |
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122 | fd_kill (EV_A_ p->fd); |
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123 | } |
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124 | else |
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125 | fd_event ( |
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126 | EV_A_ |
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127 | p->fd, |
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128 | (p->revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
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129 | | (p->revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
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130 | ); |
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131 | } |
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132 | } |
95 | } |
133 | } |
96 | |
134 | |
97 | static int |
135 | inline_size |
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136 | int |
98 | poll_init (EV_P_ int flags) |
137 | poll_init (EV_P_ int flags) |
99 | { |
138 | { |
100 | method_fudge = 1e-3; /* needed to compensate for select returning early, very conservative */ |
139 | backend_mintime = 1e-3; |
101 | method_modify = poll_modify; |
140 | backend_modify = poll_modify; |
102 | method_poll = poll_poll; |
141 | backend_poll = poll_poll; |
103 | |
142 | |
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143 | pollidxs = 0; pollidxmax = 0; |
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144 | polls = 0; pollmax = 0; pollcnt = 0; |
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145 | |
104 | return EVMETHOD_POLL; |
146 | return EVBACKEND_POLL; |
105 | } |
147 | } |
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148 | |
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149 | inline_size |
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150 | void |
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151 | poll_destroy (EV_P) |
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152 | { |
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153 | ev_free (pollidxs); |
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154 | ev_free (polls); |
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155 | } |
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156 | |