X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/6879205607d844eab17dd6c735f8e80bf1490baf..9b47da80fe3aeb57d3340a633c83dd6e08bcc8e4:/ev_poll.c diff --git a/ev_poll.c b/ev_poll.c index 4793212..388aec0 100644 --- a/ev_poll.c +++ b/ev_poll.c @@ -1,110 +1,135 @@ /* - * libev epoll fd activity backend + * libev poll fd activity backend * * Copyright (c) 2007 Marc Alexander Lehmann * All rights reserved. * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: + * Redistribution and use in source and binary forms, with or without modifica- + * tion, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- + * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO + * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- + * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- + * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * * Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following - * disclaimer in the documentation and/or other materials provided - * with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License ("GPL") version 2 or any later version, + * in which case the provisions of the GPL are applicable instead of + * the above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the BSD license, indicate your decision + * by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file under + * either the BSD or the GPL. */ -#include +#include -static int epoll_fd = -1; +void inline_size +pollidx_init (int *base, int count) +{ + while (count--) + *base++ = -1; +} static void -epoll_modify (int fd, int oev, int nev) +poll_modify (EV_P_ int fd, int oev, int nev) { - int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL; + int idx; - struct epoll_event ev; - ev.data.fd = fd; - ev.events = - (nev & EV_READ ? EPOLLIN : 0) - | (nev & EV_WRITE ? EPOLLOUT : 0); + if (oev == nev) + return; - epoll_ctl (epoll_fd, mode, fd, &ev); -} + array_needsize (int, pollidxs, pollidxmax, fd + 1, pollidx_init); -static void -epoll_postfork_child (void) -{ - int fd; + idx = pollidxs [fd]; + + if (idx < 0) /* need to allocate a new pollfd */ + { + pollidxs [fd] = idx = pollcnt++; + array_needsize (struct pollfd, polls, pollmax, pollcnt, EMPTY2); + polls [idx].fd = fd; + } - epoll_fd = epoll_create (256); - fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); + assert (polls [idx].fd == fd); - /* re-register interest in fds */ - for (fd = 0; fd < anfdmax; ++fd) - if (anfds [fd].events)//D - epoll_modify (fd, EV_NONE, anfds [fd].events); -} + if (nev) + polls [idx].events = + (nev & EV_READ ? POLLIN : 0) + | (nev & EV_WRITE ? POLLOUT : 0); + else /* remove pollfd */ + { + pollidxs [fd] = -1; -static struct epoll_event *events; -static int eventmax; + if (expect_true (idx < --pollcnt)) + { + polls [idx] = polls [pollcnt]; + pollidxs [polls [idx].fd] = idx; + } + } +} static void -epoll_poll (ev_tstamp timeout) +poll_poll (EV_P_ ev_tstamp timeout) { - int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.)); int i; + int res = poll (polls, pollcnt, (int)ceil (timeout * 1000.)); - if (eventcnt < 0) - return; - - for (i = 0; i < eventcnt; ++i) - fd_event ( - events [i].data.fd, - (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) - | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) - ); - - /* if the receive array was full, increase its size */ - if (expect_false (eventcnt == eventmax)) + if (expect_false (res < 0)) { - free (events); - eventmax = array_roundsize (events, eventmax << 1); - events = malloc (sizeof (struct epoll_event) * eventmax); + if (errno == EBADF) + fd_ebadf (EV_A); + else if (errno == ENOMEM && !syserr_cb) + fd_enomem (EV_A); + else if (errno != EINTR) + syserr ("(libev) poll"); + + return; } + + for (i = 0; i < pollcnt; ++i) + if (expect_false (polls [i].revents & POLLNVAL)) + fd_kill (EV_A_ polls [i].fd); + else + fd_event ( + EV_A_ + polls [i].fd, + (polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) + | (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) + ); } -static void -epoll_init (int flags) +int inline_size +poll_init (EV_P_ int flags) { - epoll_fd = epoll_create (256); - - if (epoll_fd < 0) - return; + backend_fudge = 0.; /* posix says this is zero */ + backend_modify = poll_modify; + backend_poll = poll_poll; - fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); + pollidxs = 0; pollidxmax = 0; + polls = 0; pollmax = 0; pollcnt = 0; - ev_method = EVMETHOD_EPOLL; - method_fudge = 1e-3; /* needed to compensate for epoll returning early */ - method_modify = epoll_modify; - method_poll = epoll_poll; + return EVBACKEND_POLL; +} - eventmax = 64; /* intiial number of events receivable per poll */ - events = malloc (sizeof (struct epoll_event) * eventmax); +void inline_size +poll_destroy (EV_P) +{ + ev_free (pollidxs); + ev_free (polls); }