X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/0c513fd963e79da73c7d77018523ac956a5066bd..b7ecda387a714c9e3d208b453360d15bd4cad664:/ev_poll.c?ds=inline diff --git a/ev_poll.c b/ev_poll.c index 0af63f3..388aec0 100644 --- a/ev_poll.c +++ b/ev_poll.c @@ -1,42 +1,45 @@ /* - * 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 -static struct pollfd *polls; -static int pollmax, pollcnt; -static int *pollidxs; /* maps fds into structure indices */ -static int pollidxmax; - -static void +void inline_size pollidx_init (int *base, int count) { while (count--) @@ -44,29 +47,36 @@ pollidx_init (int *base, int count) } static void -poll_modify (int fd, int oev, int nev) +poll_modify (EV_P_ int fd, int oev, int nev) { int idx; - array_needsize (pollidxs, pollidxmax, fd + 1, pollidx_init); + + if (oev == nev) + return; + + array_needsize (int, pollidxs, pollidxmax, fd + 1, pollidx_init); idx = pollidxs [fd]; if (idx < 0) /* need to allocate a new pollfd */ { - idx = pollcnt++; - array_needsize (polls, pollmax, pollcnt, ); + pollidxs [fd] = idx = pollcnt++; + array_needsize (struct pollfd, polls, pollmax, pollcnt, EMPTY2); polls [idx].fd = fd; } + assert (polls [idx].fd == fd); + if (nev) polls [idx].events = (nev & EV_READ ? POLLIN : 0) | (nev & EV_WRITE ? POLLOUT : 0); else /* remove pollfd */ { - if (idx < pollcnt--) + pollidxs [fd] = -1; + + if (expect_true (idx < --pollcnt)) { - pollidxs [fd] = -1; polls [idx] = polls [pollcnt]; pollidxs [polls [idx].fd] = idx; } @@ -74,35 +84,52 @@ poll_modify (int fd, int oev, int nev) } static void -poll_poll (ev_tstamp timeout) +poll_poll (EV_P_ ev_tstamp timeout) { - int res = poll (polls, pollcnt, ceil (timeout * 1000.)); + int i; + int res = poll (polls, pollcnt, (int)ceil (timeout * 1000.)); - if (res > 0) - { - int i; - - for (i = 0; i < pollcnt; ++i) - fd_event ( - polls [i].fd, - (polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) - | (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) - ); - } - else if (res < 0) + if (expect_false (res < 0)) { if (errno == EBADF) - fd_ebadf (); - else if (errno == ENOMEM) - fd_enomem (); + 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 -poll_init (int flags) +int inline_size +poll_init (EV_P_ int flags) { - ev_method = EVMETHOD_POLL; - method_fudge = 1e-3; /* needed to compensate for select returning early, very conservative */ - method_modify = poll_modify; - method_poll = poll_poll; + backend_fudge = 0.; /* posix says this is zero */ + backend_modify = poll_modify; + backend_poll = poll_poll; + + pollidxs = 0; pollidxmax = 0; + polls = 0; pollmax = 0; pollcnt = 0; + + return EVBACKEND_POLL; } + +void inline_size +poll_destroy (EV_P) +{ + ev_free (pollidxs); + ev_free (polls); +} +