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 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: |
9 | * |
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10 | * 1. Redistributions of source code must retain the above copyright notice, |
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11 | * this list of conditions and the following disclaimer. |
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12 | * |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
10 | * |
27 | * |
11 | * * Redistributions of source code must retain the above copyright |
28 | * Alternatively, the contents of this file may be used under the terms of |
12 | * notice, this list of conditions and the following disclaimer. |
29 | * the GNU General Public License ("GPL") version 2 or any later version, |
13 | * |
30 | * in which case the provisions of the GPL are applicable instead of |
14 | * * Redistributions in binary form must reproduce the above |
31 | * the above. If you wish to allow the use of your version of this file |
15 | * copyright notice, this list of conditions and the following |
32 | * only under the terms of the GPL and not to allow others to use your |
16 | * disclaimer in the documentation and/or other materials provided |
33 | * version of this file under the BSD license, indicate your decision |
17 | * with the distribution. |
34 | * by deleting the provisions above and replace them with the notice |
18 | * |
35 | * and other provisions required by the GPL. If you do not delete the |
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
36 | * provisions above, a recipient may use your version of this file under |
20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
37 | * either the BSD or the GPL. |
21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 | */ |
38 | */ |
31 | |
39 | |
32 | #include <poll.h> |
40 | #include <poll.h> |
33 | |
41 | |
34 | static void |
42 | void inline_size |
35 | pollidx_init (int *base, int count) |
43 | pollidx_init (int *base, int count) |
36 | { |
44 | { |
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45 | /* consider using memset (.., -1, ...), which is pratically guarenteed |
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46 | * to work on all systems implementing poll */ |
37 | while (count--) |
47 | while (count--) |
38 | *base++ = -1; |
48 | *base++ = -1; |
39 | } |
49 | } |
40 | |
50 | |
41 | static void |
51 | static void |
42 | poll_modify (EV_P_ int fd, int oev, int nev) |
52 | poll_modify (EV_P_ int fd, int oev, int nev) |
43 | { |
53 | { |
44 | int idx; |
54 | int idx; |
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55 | |
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56 | if (oev == nev) |
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57 | return; |
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58 | |
45 | array_needsize (pollidxs, pollidxmax, fd + 1, pollidx_init); |
59 | array_needsize (int, pollidxs, pollidxmax, fd + 1, pollidx_init); |
46 | |
60 | |
47 | idx = pollidxs [fd]; |
61 | idx = pollidxs [fd]; |
48 | |
62 | |
49 | if (idx < 0) /* need to allocate a new pollfd */ |
63 | if (idx < 0) /* need to allocate a new pollfd */ |
50 | { |
64 | { |
51 | idx = pollcnt++; |
65 | pollidxs [fd] = idx = pollcnt++; |
52 | array_needsize (polls, pollmax, pollcnt, ); |
66 | array_needsize (struct pollfd, polls, pollmax, pollcnt, EMPTY2); |
53 | polls [idx].fd = fd; |
67 | polls [idx].fd = fd; |
54 | } |
68 | } |
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69 | |
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70 | assert (polls [idx].fd == fd); |
55 | |
71 | |
56 | if (nev) |
72 | if (nev) |
57 | polls [idx].events = |
73 | polls [idx].events = |
58 | (nev & EV_READ ? POLLIN : 0) |
74 | (nev & EV_READ ? POLLIN : 0) |
59 | | (nev & EV_WRITE ? POLLOUT : 0); |
75 | | (nev & EV_WRITE ? POLLOUT : 0); |
60 | else /* remove pollfd */ |
76 | else /* remove pollfd */ |
61 | { |
77 | { |
62 | if (idx < pollcnt--) |
78 | pollidxs [fd] = -1; |
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79 | |
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80 | if (expect_true (idx < --pollcnt)) |
63 | { |
81 | { |
64 | pollidxs [fd] = -1; |
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65 | polls [idx] = polls [pollcnt]; |
82 | polls [idx] = polls [pollcnt]; |
66 | pollidxs [polls [idx].fd] = idx; |
83 | pollidxs [polls [idx].fd] = idx; |
67 | } |
84 | } |
68 | } |
85 | } |
69 | } |
86 | } |
70 | |
87 | |
71 | static void |
88 | static void |
72 | poll_poll (EV_P_ ev_tstamp timeout) |
89 | poll_poll (EV_P_ ev_tstamp timeout) |
73 | { |
90 | { |
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91 | struct pollfd *p; |
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92 | int res; |
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93 | |
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94 | if (expect_false (suspend_cb)) suspend_cb (EV_A); |
74 | int res = poll (polls, pollcnt, ceil (timeout * 1000.)); |
95 | res = poll (polls, pollcnt, (int)ceil (timeout * 1000.)); |
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96 | if (expect_false (resume_cb)) resume_cb (EV_A); |
75 | |
97 | |
76 | if (res > 0) |
98 | if (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 | { |
99 | { |
90 | if (errno == EBADF) |
100 | if (errno == EBADF) |
91 | fd_ebadf (EV_A); |
101 | fd_ebadf (EV_A); |
92 | else if (errno == ENOMEM) |
102 | else if (errno == ENOMEM && !syserr_cb) |
93 | fd_enomem (EV_A); |
103 | fd_enomem (EV_A); |
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104 | else if (errno != EINTR) |
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105 | ev_syserr ("(libev) poll"); |
94 | } |
106 | } |
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107 | else |
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108 | for (p = polls; res; ++p) |
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109 | if (expect_false (p->revents)) /* this expect is debatable */ |
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110 | { |
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111 | --res; |
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112 | |
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113 | if (expect_false (p->revents & POLLNVAL)) |
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114 | fd_kill (EV_A_ p->fd); |
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115 | else |
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116 | fd_event ( |
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117 | EV_A_ |
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118 | p->fd, |
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119 | (p->revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
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120 | | (p->revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
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121 | ); |
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122 | } |
95 | } |
123 | } |
96 | |
124 | |
97 | static int |
125 | int inline_size |
98 | poll_init (EV_P_ int flags) |
126 | poll_init (EV_P_ int flags) |
99 | { |
127 | { |
100 | method_fudge = 1e-3; /* needed to compensate for select returning early, very conservative */ |
128 | backend_fudge = 0.; /* posix says this is zero */ |
101 | method_modify = poll_modify; |
129 | backend_modify = poll_modify; |
102 | method_poll = poll_poll; |
130 | backend_poll = poll_poll; |
103 | |
131 | |
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132 | pollidxs = 0; pollidxmax = 0; |
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133 | polls = 0; pollmax = 0; pollcnt = 0; |
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134 | |
104 | return EVMETHOD_POLL; |
135 | return EVBACKEND_POLL; |
105 | } |
136 | } |
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137 | |
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138 | void inline_size |
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139 | poll_destroy (EV_P) |
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140 | { |
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141 | ev_free (pollidxs); |
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142 | ev_free (polls); |
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143 | } |
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144 | |