1 | /* |
1 | /* |
2 | * libev poll 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 modifica- |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * tion, are permitted provided that the following conditions are met: |
8 | * tion, are permitted provided that the following conditions are met: |
9 | * |
9 | * |
10 | * 1. Redistributions of source code must retain the above copyright notice, |
10 | * 1. Redistributions of source code must retain the above copyright notice, |
11 | * this list of conditions and the following disclaimer. |
11 | * this list of conditions and the following disclaimer. |
12 | * |
12 | * |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
14 | * notice, this list of conditions and the following disclaimer in the |
14 | * notice, this list of conditions and the following disclaimer in the |
15 | * documentation and/or other materials provided with the distribution. |
15 | * documentation and/or other materials provided with the distribution. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
… | |
… | |
37 | * either the BSD or the GPL. |
37 | * either the BSD or the GPL. |
38 | */ |
38 | */ |
39 | |
39 | |
40 | #include <poll.h> |
40 | #include <poll.h> |
41 | |
41 | |
42 | void inline_size |
42 | inline_size |
43 | pollidx_init (int *base, int count) |
43 | void |
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44 | array_needsize_pollidx (int *base, int offset, int count) |
44 | { |
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; |
45 | while (count--) |
50 | while (count--) |
46 | *base++ = -1; |
51 | *base++ = -1; |
47 | } |
52 | } |
48 | |
53 | |
49 | static void |
54 | static void |
… | |
… | |
52 | int idx; |
57 | int idx; |
53 | |
58 | |
54 | if (oev == nev) |
59 | if (oev == nev) |
55 | return; |
60 | return; |
56 | |
61 | |
57 | array_needsize (int, pollidxs, pollidxmax, fd + 1, pollidx_init); |
62 | array_needsize (int, pollidxs, pollidxmax, fd + 1, array_needsize_pollidx); |
58 | |
63 | |
59 | idx = pollidxs [fd]; |
64 | idx = pollidxs [fd]; |
60 | |
65 | |
61 | if (idx < 0) /* need to allocate a new pollfd */ |
66 | if (idx < 0) /* need to allocate a new pollfd */ |
62 | { |
67 | { |
63 | pollidxs [fd] = idx = pollcnt++; |
68 | pollidxs [fd] = idx = pollcnt++; |
64 | array_needsize (struct pollfd, polls, pollmax, pollcnt, EMPTY2); |
69 | array_needsize (struct pollfd, polls, pollmax, pollcnt, array_needsize_noinit); |
65 | polls [idx].fd = fd; |
70 | polls [idx].fd = fd; |
66 | } |
71 | } |
67 | |
72 | |
68 | assert (polls [idx].fd == fd); |
73 | assert (polls [idx].fd == fd); |
69 | |
74 | |
… | |
… | |
73 | | (nev & EV_WRITE ? POLLOUT : 0); |
78 | | (nev & EV_WRITE ? POLLOUT : 0); |
74 | else /* remove pollfd */ |
79 | else /* remove pollfd */ |
75 | { |
80 | { |
76 | pollidxs [fd] = -1; |
81 | pollidxs [fd] = -1; |
77 | |
82 | |
78 | if (expect_true (idx < --pollcnt)) |
83 | if (ecb_expect_true (idx < --pollcnt)) |
79 | { |
84 | { |
80 | polls [idx] = polls [pollcnt]; |
85 | polls [idx] = polls [pollcnt]; |
81 | pollidxs [polls [idx].fd] = idx; |
86 | pollidxs [polls [idx].fd] = idx; |
82 | } |
87 | } |
83 | } |
88 | } |
84 | } |
89 | } |
85 | |
90 | |
86 | static void |
91 | static void |
87 | poll_poll (EV_P_ ev_tstamp timeout) |
92 | poll_poll (EV_P_ ev_tstamp timeout) |
88 | { |
93 | { |
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94 | struct pollfd *p; |
89 | int i; |
95 | int res; |
90 | int res = poll (polls, pollcnt, (int)ceil (timeout * 1000.)); |
96 | |
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97 | EV_RELEASE_CB; |
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98 | res = poll (polls, pollcnt, EV_TS_TO_MSEC (timeout)); |
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99 | EV_ACQUIRE_CB; |
91 | |
100 | |
92 | if (expect_false (res < 0)) |
101 | if (ecb_expect_false (res < 0)) |
93 | { |
102 | { |
94 | if (errno == EBADF) |
103 | if (errno == EBADF) |
95 | fd_ebadf (EV_A); |
104 | fd_ebadf (EV_A); |
96 | else if (errno == ENOMEM && !syserr_cb) |
105 | else if (errno == ENOMEM && !syserr_cb) |
97 | fd_enomem (EV_A); |
106 | fd_enomem (EV_A); |
98 | else if (errno != EINTR) |
107 | else if (errno != EINTR) |
99 | syserr ("(libev) poll"); |
108 | ev_syserr ("(libev) poll"); |
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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)); |
100 | |
114 | |
101 | return; |
115 | if (ecb_expect_false (p->revents)) /* this expect is debatable */ |
102 | } |
116 | { |
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117 | --res; |
103 | |
118 | |
104 | for (i = 0; i < pollcnt; ++i) |
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105 | if (expect_false (polls [i].revents & POLLNVAL)) |
119 | if (ecb_expect_false (p->revents & POLLNVAL)) |
106 | fd_kill (EV_A_ polls [i].fd); |
120 | { |
107 | else |
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 |
108 | fd_event ( |
125 | fd_event ( |
109 | EV_A_ |
126 | EV_A_ |
110 | polls [i].fd, |
127 | p->fd, |
111 | (polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
128 | (p->revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
112 | | (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
129 | | (p->revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
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130 | ); |
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131 | } |
113 | ); |
132 | } |
114 | } |
133 | } |
115 | |
134 | |
116 | int inline_size |
135 | inline_size |
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136 | int |
117 | poll_init (EV_P_ int flags) |
137 | poll_init (EV_P_ int flags) |
118 | { |
138 | { |
119 | backend_fudge = 0.; /* posix says this is zero */ |
139 | backend_mintime = 1e-3; |
120 | backend_modify = poll_modify; |
140 | backend_modify = poll_modify; |
121 | backend_poll = poll_poll; |
141 | backend_poll = poll_poll; |
122 | |
142 | |
123 | pollidxs = 0; pollidxmax = 0; |
143 | pollidxs = 0; pollidxmax = 0; |
124 | polls = 0; pollmax = 0; pollcnt = 0; |
144 | polls = 0; pollmax = 0; pollcnt = 0; |
125 | |
145 | |
126 | return EVBACKEND_POLL; |
146 | return EVBACKEND_POLL; |
127 | } |
147 | } |
128 | |
148 | |
129 | void inline_size |
149 | inline_size |
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|
150 | void |
130 | poll_destroy (EV_P) |
151 | poll_destroy (EV_P) |
131 | { |
152 | { |
132 | ev_free (pollidxs); |
153 | ev_free (pollidxs); |
133 | ev_free (polls); |
154 | ev_free (polls); |
134 | } |
155 | } |