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4 | * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de> |
4 | * Copyright (c) 2007,2008,2009,2010,2011 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, |
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115 | if (!epoll_ctl (backend_fd, EPOLL_CTL_MOD, fd, &ev)) |
115 | if (!epoll_ctl (backend_fd, EPOLL_CTL_MOD, fd, &ev)) |
116 | return; |
116 | return; |
117 | } |
117 | } |
118 | else if (expect_true (errno == EPERM)) |
118 | else if (expect_true (errno == EPERM)) |
119 | { |
119 | { |
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120 | /* EPERM means the fd is always ready, but epoll is too snobbish */ |
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121 | /* to handle it, unlike select or poll. */ |
120 | anfds [fd].emask = EV_EMASK_EPERM; |
122 | anfds [fd].emask = EV_EMASK_EPERM; |
121 | |
123 | |
122 | /* add fd to epoll_eperms, if not already inside */ |
124 | /* add fd to epoll_eperms, if not already inside */ |
123 | if (!(oldmask & EV_EMASK_EPERM)) |
125 | if (!(oldmask & EV_EMASK_EPERM)) |
124 | { |
126 | { |
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139 | static void |
141 | static void |
140 | epoll_poll (EV_P_ ev_tstamp timeout) |
142 | epoll_poll (EV_P_ ev_tstamp timeout) |
141 | { |
143 | { |
142 | int i; |
144 | int i; |
143 | int eventcnt; |
145 | int eventcnt; |
144 | |
146 | |
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147 | if (expect_false (epoll_epermcnt)) |
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148 | timeout = 0.; |
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149 | |
145 | /* epoll wait times cannot be larger than (LONG_MAX - 999UL) / HZ msecs, which is below */ |
150 | /* epoll wait times cannot be larger than (LONG_MAX - 999UL) / HZ msecs, which is below */ |
146 | /* the default libev max wait time, however. */ |
151 | /* the default libev max wait time, however. */ |
147 | EV_RELEASE_CB; |
152 | EV_RELEASE_CB; |
148 | eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, (int)ceil (timeout * 1000.)); |
153 | eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, timeout * 1e3); |
149 | EV_ACQUIRE_CB; |
154 | EV_ACQUIRE_CB; |
150 | |
155 | |
151 | if (expect_false (eventcnt < 0)) |
156 | if (expect_false (eventcnt < 0)) |
152 | { |
157 | { |
153 | if (errno != EINTR) |
158 | if (errno != EINTR) |
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229 | if (backend_fd < 0) |
234 | if (backend_fd < 0) |
230 | return 0; |
235 | return 0; |
231 | |
236 | |
232 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
237 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
233 | |
238 | |
234 | backend_fudge = 0.; /* kernel sources seem to indicate this to be zero */ |
239 | backend_fudge = 1./1024.; /* epoll does sometimes return early, this is just to avoid the worst */ |
235 | backend_modify = epoll_modify; |
240 | backend_modify = epoll_modify; |
236 | backend_poll = epoll_poll; |
241 | backend_poll = epoll_poll; |
237 | |
242 | |
238 | epoll_eventmax = 64; /* initial number of events receivable per poll */ |
243 | epoll_eventmax = 64; /* initial number of events receivable per poll */ |
239 | epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax); |
244 | epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax); |