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Comparing libev/ev_epoll.c (file contents):
Revision 1.67 by root, Wed Jun 20 12:39:53 2012 UTC vs.
Revision 1.74 by root, Sun Jun 23 00:21:24 2019 UTC

1/* 1/*
2 * libev epoll fd activity backend 2 * libev epoll fd activity backend
3 * 3 *
4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011,2016,2017,2019 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 *
… …
122 anfds [fd].emask = EV_EMASK_EPERM; 122 anfds [fd].emask = EV_EMASK_EPERM;
123 123
124 /* add fd to epoll_eperms, if not already inside */ 124 /* add fd to epoll_eperms, if not already inside */
125 if (!(oldmask & EV_EMASK_EPERM)) 125 if (!(oldmask & EV_EMASK_EPERM))
126 { 126 {
127 array_needsize (int, epoll_eperms, epoll_epermmax, epoll_epermcnt + 1, EMPTY2); 127 array_needsize (int, epoll_eperms, epoll_epermmax, epoll_epermcnt + 1, array_needsize_noinit);
128 epoll_eperms [epoll_epermcnt++] = fd; 128 epoll_eperms [epoll_epermcnt++] = fd;
129 } 129 }
130 130
131 return; 131 return;
132 } 132 }
… …
177 * we assume that fd is always in range, as we never shrink the anfds array 177 * we assume that fd is always in range, as we never shrink the anfds array
178 */ 178 */
179 if (expect_false ((uint32_t)anfds [fd].egen != (uint32_t)(ev->data.u64 >> 32))) 179 if (expect_false ((uint32_t)anfds [fd].egen != (uint32_t)(ev->data.u64 >> 32)))
180 { 180 {
181 /* recreate kernel state */ 181 /* recreate kernel state */
182 postfork = 1; 182 postfork |= 2;
183 continue; 183 continue;
184 } 184 }
185 185
186 if (expect_false (got & ~want)) 186 if (expect_false (got & ~want))
187 { 187 {
… …
201 201
202 /* pre-2.6.9 kernels require a non-null pointer with EPOLL_CTL_DEL, */ 202 /* pre-2.6.9 kernels require a non-null pointer with EPOLL_CTL_DEL, */
203 /* which is fortunately easy to do for us. */ 203 /* which is fortunately easy to do for us. */
204 if (epoll_ctl (backend_fd, want ? EPOLL_CTL_MOD : EPOLL_CTL_DEL, fd, ev)) 204 if (epoll_ctl (backend_fd, want ? EPOLL_CTL_MOD : EPOLL_CTL_DEL, fd, ev))
205 { 205 {
206 postfork = 1; /* an error occurred, recreate kernel state */ 206 postfork |= 2; /* an error occurred, recreate kernel state */
207 continue; 207 continue;
208 } 208 }
209 } 209 }
210 210
211 fd_event (EV_A_ fd, got); 211 fd_event (EV_A_ fd, got);
… …
226 unsigned char events = anfds [fd].events & (EV_READ | EV_WRITE); 226 unsigned char events = anfds [fd].events & (EV_READ | EV_WRITE);
227 227
228 if (anfds [fd].emask & EV_EMASK_EPERM && events) 228 if (anfds [fd].emask & EV_EMASK_EPERM && events)
229 fd_event (EV_A_ fd, events); 229 fd_event (EV_A_ fd, events);
230 else 230 else
231 {
231 epoll_eperms [i] = epoll_eperms [--epoll_epermcnt]; 232 epoll_eperms [i] = epoll_eperms [--epoll_epermcnt];
233 anfds [fd].emask = 0;
234 }
235 }
236}
237
238static int
239ev_epoll_create (void)
240{
241 int fd;
242
243#if defined EPOLL_CLOEXEC && !defined __ANDROID__
244 fd = epoll_create1 (EPOLL_CLOEXEC);
245
246 if (fd < 0 && (errno == EINVAL || errno == ENOSYS))
247#endif
232 } 248 {
233} 249 fd = epoll_create (256);
234 250
251 if (fd >= 0)
252 fcntl (fd, F_SETFD, FD_CLOEXEC);
253 }
254
255 return fd;
256}
257
235int inline_size 258inline_size
259int
236epoll_init (EV_P_ int flags) 260epoll_init (EV_P_ int flags)
237{ 261{
238#ifdef EPOLL_CLOEXEC
239 backend_fd = epoll_create1 (EPOLL_CLOEXEC);
240
241 if (backend_fd < 0 && (errno == EINVAL || errno == ENOSYS))
242#endif
243 backend_fd = epoll_create (256); 262 if ((backend_fd = ev_epoll_create ()) < 0)
244
245 if (backend_fd < 0)
246 return 0; 263 return 0;
247
248 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
249 264
250 backend_mintime = 1e-3; /* epoll does sometimes return early, this is just to avoid the worst */ 265 backend_mintime = 1e-3; /* epoll does sometimes return early, this is just to avoid the worst */
251 backend_modify = epoll_modify; 266 backend_modify = epoll_modify;
252 backend_poll = epoll_poll; 267 backend_poll = epoll_poll;
253 268
… …
255 epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax); 270 epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax);
256 271
257 return EVBACKEND_EPOLL; 272 return EVBACKEND_EPOLL;
258} 273}
259 274
260void inline_size 275inline_size
276void
261epoll_destroy (EV_P) 277epoll_destroy (EV_P)
262{ 278{
263 ev_free (epoll_events); 279 ev_free (epoll_events);
264 array_free (epoll_eperm, EMPTY); 280 array_free (epoll_eperm, EMPTY);
265} 281}
266 282
267void inline_size 283inline_size
284void
268epoll_fork (EV_P) 285epoll_fork (EV_P)
269{ 286{
270 close (backend_fd); 287 close (backend_fd);
271 288
272 while ((backend_fd = epoll_create (256)) < 0) 289 while ((backend_fd = ev_epoll_create ()) < 0)
273 ev_syserr ("(libev) epoll_create"); 290 ev_syserr ("(libev) epoll_create");
274 291
275 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
276
277 fd_rearm_all (EV_A); 292 fd_rearm_all (EV_A);
278} 293}
279 294

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