X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/23f51f36bfcf6f217b2a14967f968af5dd4675e7..b7ecda387a714c9e3d208b453360d15bd4cad664:/ev_kqueue.c diff --git a/ev_kqueue.c b/ev_kqueue.c index 54cd5eb..369d493 100644 --- a/ev_kqueue.c +++ b/ev_kqueue.c @@ -1,30 +1,40 @@ /* - * Copyright 2007 Marc Alexander Lehmann - * Copyright 2000-2002 Niels Provos - * All rights reserved. + * libev kqueue backend * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: + * Copyright (c) 2007 Marc Alexander Lehmann + * All rights reserved. * - * 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. - * 3. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. + * 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. * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 @@ -34,20 +44,13 @@ #include #include -static void +void inline_speed kqueue_change (EV_P_ int fd, int filter, int flags, int fflags) { - struct kevent *ke; - ++kqueue_changecnt; array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2); - ke = &kqueue_changes [kqueue_changecnt - 1]; - memset (ke, 0, sizeof (struct kevent)); - ke->ident = fd; - ke->filter = filter; - ke->flags = flags; - ke->fflags = fflags; + EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0); } #ifndef NOTE_EOF @@ -57,17 +60,20 @@ kqueue_change (EV_P_ int fd, int filter, int flags, int fflags) static void kqueue_modify (EV_P_ int fd, int oev, int nev) { - /* to detect close/reopen reliably, we have to remove and re-add */ - /* event requests even when oev == nev */ + if (oev != nev) + { + if (oev & EV_READ) + kqueue_change (EV_A_ fd, EVFILT_READ , EV_DELETE, 0); - if (oev & EV_READ) - kqueue_change (EV_A_ fd, EVFILT_READ, EV_DELETE, 0); + if (oev & EV_WRITE) + kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0); + } - if (oev & EV_WRITE) - kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0); + /* to detect close/reopen reliably, we have to re-add */ + /* event requests even when oev == nev */ if (nev & EV_READ) - kqueue_change (EV_A_ fd, EVFILT_READ, EV_ADD, NOTE_EOF); + kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD, NOTE_EOF); if (nev & EV_WRITE) kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF); @@ -83,16 +89,16 @@ kqueue_poll (EV_P_ ev_tstamp timeout) if (kqueue_changecnt > kqueue_eventmax) { ev_free (kqueue_events); - kqueue_eventmax = array_roundsize (struct kevent, kqueue_changecnt); + kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt); kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); } ts.tv_sec = (time_t)timeout; ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9); - res = kevent (kqueue_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts); + res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts); kqueue_changecnt = 0; - if (res < 0) + if (expect_false (res < 0)) { if (errno != EINTR) syserr ("(libev) kevent"); @@ -104,20 +110,10 @@ kqueue_poll (EV_P_ ev_tstamp timeout) { int fd = kqueue_events [i].ident; - if (kqueue_events [i].flags & EV_ERROR) + if (expect_false (kqueue_events [i].flags & EV_ERROR)) { int err = kqueue_events [i].data; - /* - * errors that may happen - * EBADF happens when the file discriptor has been - * closed, - * ENOENT when the file descriptor was closed and - * then reopened. - * EINVAL for some reasons not understood; EINVAL - * should not be returned ever; but FreeBSD does :-\ - */ - /* we are only interested in errors for fds that we are interested in :) */ if (anfds [fd].events) { @@ -147,46 +143,25 @@ kqueue_poll (EV_P_ ev_tstamp timeout) if (expect_false (res == kqueue_eventmax)) { ev_free (kqueue_events); - kqueue_eventmax = array_roundsize (struct kevent, kqueue_eventmax << 1); + kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_eventmax + 1); kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); } } -static int +int inline_size kqueue_init (EV_P_ int flags) { - struct kevent ch, ev; - /* Initalize the kernel queue */ - if ((kqueue_fd = kqueue ()) < 0) + if ((backend_fd = kqueue ()) < 0) return 0; - fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ - - /* Check for Mac OS X kqueue bug. */ - ch.ident = -1; - ch.filter = EVFILT_READ; - ch.flags = EV_ADD; - - /* - * If kqueue works, then kevent will succeed, and it will - * stick an error in ev. If kqueue is broken, then - * kevent will fail. - */ - if (kevent (kqueue_fd, &ch, 1, &ev, 1, 0) != 1 - || ev.ident != -1 - || ev.flags != EV_ERROR) - { - /* detected broken kqueue */ - close (kqueue_fd); - return 0; - } + fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ - backend_fudge = 1e-3; /* needed to compensate for kevent returning early */ + backend_fudge = 0.; backend_modify = kqueue_modify; backend_poll = kqueue_poll; - kqueue_eventmax = 64; /* intiial number of events receivable per poll */ + kqueue_eventmax = 64; /* initial number of events receivable per poll */ kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); kqueue_changes = 0; @@ -196,24 +171,22 @@ kqueue_init (EV_P_ int flags) return EVBACKEND_KQUEUE; } -static void +void inline_size kqueue_destroy (EV_P) { - close (kqueue_fd); - ev_free (kqueue_events); ev_free (kqueue_changes); } -static void +void inline_size kqueue_fork (EV_P) { - close (kqueue_fd); + close (backend_fd); - while ((kqueue_fd = kqueue ()) < 0) + while ((backend_fd = kqueue ()) < 0) syserr ("(libev) kqueue"); - fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); + fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* re-register interest in fds */ fd_rearm_all (EV_A);