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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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142 | epoll_poll (EV_P_ ev_tstamp timeout) |
142 | epoll_poll (EV_P_ ev_tstamp timeout) |
143 | { |
143 | { |
144 | int i; |
144 | int i; |
145 | int eventcnt; |
145 | int eventcnt; |
146 | |
146 | |
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147 | if (expect_false (epoll_epermcnt)) |
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148 | timeout = 0.; |
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149 | |
147 | /* 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 */ |
148 | /* the default libev max wait time, however. */ |
151 | /* the default libev max wait time, however. */ |
149 | EV_RELEASE_CB; |
152 | EV_RELEASE_CB; |
150 | eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, |
153 | eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, timeout * 1e3); |
151 | epoll_epermcnt ? 0 : ev_timeout_to_ms (timeout)); |
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152 | EV_ACQUIRE_CB; |
154 | EV_ACQUIRE_CB; |
153 | |
155 | |
154 | if (expect_false (eventcnt < 0)) |
156 | if (expect_false (eventcnt < 0)) |
155 | { |
157 | { |
156 | if (errno != EINTR) |
158 | if (errno != EINTR) |
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232 | if (backend_fd < 0) |
234 | if (backend_fd < 0) |
233 | return 0; |
235 | return 0; |
234 | |
236 | |
235 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
237 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
236 | |
238 | |
237 | backend_fudge = 0.; /* kernel sources seem to indicate this to be zero */ |
239 | backend_mintime = 1./1024.; /* epoll does sometimes return early, this is just to avoid the worst */ |
238 | backend_modify = epoll_modify; |
240 | backend_modify = epoll_modify; |
239 | backend_poll = epoll_poll; |
241 | backend_poll = epoll_poll; |
240 | |
242 | |
241 | epoll_eventmax = 64; /* initial number of events receivable per poll */ |
243 | epoll_eventmax = 64; /* initial number of events receivable per poll */ |
242 | 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); |
243 | |
245 | |
244 | return EVBACKEND_EPOLL; |
246 | return EVBACKEND_EPOLL; |