/* * $Id: comm_kqueue.cc,v 1.17.2.1 2008/02/25 03:45:24 amosjeffries Exp $ * * DEBUG: section 5 Socket Functions * * SQUID Web Proxy Cache http://www.squid-cache.org/ * ---------------------------------------------------------- * * Squid is the result of efforts by numerous individuals from * the Internet community; see the CONTRIBUTORS file for full * details. Many organizations have provided support for Squid's * development; see the SPONSORS file for full details. Squid is * Copyrighted (C) 2001 by the Regents of the University of * California; see the COPYRIGHT file for full details. Squid * incorporates software developed and/or copyrighted by other * sources; see the CREDITS file for full details. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. * */ /* * This code was originally written by Benno Rice and hacked on quite * a bit by Adrian. Adrian then took it to the hybrid-ircd project to use * in their new IO subsystem. After a year of modifications and some * rather interesting changes (event aggregation) its back in squid. * Thanks to the ircd-hybrid guys. */ /* * XXX Currently not implemented / supported by this module XXX * * - delay pools * - deferred reads * - flags.read_pending * * So, its not entirely useful in a production setup since if a read * is meant to be deferred it isn't (we're not even throwing the event * away here). Eventually the rest of the code will be rewritten * so deferred reads aren't required. * -- adrian */ #include "squid.h" #include "comm_kqueue.h" #include "CacheManager.h" #include "Store.h" #include "fde.h" #include "SquidTime.h" #ifdef USE_KQUEUE #include #define KE_LENGTH 128 /* jlemon goofed up and didn't add EV_SET until fbsd 4.3 */ #ifndef EV_SET #define EV_SET(kevp, a, b, c, d, e, f) do { \ (kevp)->ident = (a); \ (kevp)->filter = (b); \ (kevp)->flags = (c); \ (kevp)->fflags = (d); \ (kevp)->data = (e); \ (kevp)->udata = (f); \ } while(0) #endif static void kq_update_events(int, short, PF *); static int kq; static struct timespec zero_timespec; static struct kevent *kqlst; /* kevent buffer */ static int kqmax; /* max structs to buffer */ static int kqoff; /* offset into the buffer */ static int max_poll_time = 1000; /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ /* Private functions */ void kq_update_events(int fd, short filter, PF * handler) { PF *cur_handler; int kep_flags; switch (filter) { case EVFILT_READ: cur_handler = fd_table[fd].read_handler; break; case EVFILT_WRITE: cur_handler = fd_table[fd].write_handler; break; default: /* XXX bad! -- adrian */ return; break; } if ((cur_handler == NULL && handler != NULL) || (cur_handler != NULL && handler == NULL)) { struct kevent *kep; kep = kqlst + kqoff; if (handler != NULL) { kep_flags = (EV_ADD | EV_ONESHOT); } else { kep_flags = EV_DELETE; } EV_SET(kep, (uintptr_t) fd, filter, kep_flags, 0, 0, 0); /* Check if we've used the last one. If we have then submit them all */ if (kqoff == kqmax - 1) { int ret; ret = kevent(kq, kqlst, kqmax, NULL, 0, &zero_timespec); /* jdc -- someone needs to do error checking... */ if (ret == -1) { perror("kq_update_events(): kevent()"); return; } kqoff = 0; } else { kqoff++; } } } /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ /* Public functions */ /* * comm_select_init * * This is a needed exported function which will be called to initialise * the network loop code. */ void comm_select_init(void) { kq = kqueue(); if (kq < 0) { fatal("comm_select_init: Couldn't open kqueue fd!\n"); } kqmax = getdtablesize(); kqlst = (struct kevent *)xmalloc(sizeof(*kqlst) * kqmax); zero_timespec.tv_sec = 0; zero_timespec.tv_nsec = 0; } /* * comm_setselect * * This is a needed exported function which will be called to register * and deregister interest in a pending IO state for a given FD. */ void commSetSelect(int fd, unsigned int type, PF * handler, void *client_data, time_t timeout) { fde *F = &fd_table[fd]; assert(fd >= 0); assert(F->flags.open); if (type & COMM_SELECT_READ) { kq_update_events(fd, EVFILT_READ, handler); F->read_handler = handler; F->read_data = client_data; } if (type & COMM_SELECT_WRITE) { kq_update_events(fd, EVFILT_WRITE, handler); F->write_handler = handler; F->write_data = client_data; } if (timeout) F->timeout = squid_curtime + timeout; } void commResetSelect(int fd) { fde *F = &fd_table[fd]; if (F->read_handler) { kq_update_events(fd, EVFILT_READ, (PF *)1); } if (F->write_handler) { kq_update_events(fd, EVFILT_WRITE, (PF *)1); } } /* * Check all connections for new connections and input data that is to be * processed. Also check for connections with data queued and whether we can * write it out. */ /* * comm_select * * Called to do the new-style IO, courtesy of of squid (like most of this * new IO code). This routine handles the stuff we've hidden in * comm_setselect and fd_table[] and calls callbacks for IO ready * events. */ comm_err_t comm_select(int msec) { int num, i; static struct kevent ke[KE_LENGTH]; struct timespec poll_time; if (msec > max_poll_time) msec = max_poll_time; poll_time.tv_sec = msec / 1000; poll_time.tv_nsec = (msec % 1000) * 1000000; for (;;) { num = kevent(kq, kqlst, kqoff, ke, KE_LENGTH, &poll_time); statCounter.select_loops++; kqoff = 0; if (num >= 0) break; if (ignoreErrno(errno)) break; getCurrentTime(); return COMM_ERROR; /* NOTREACHED */ } getCurrentTime(); if (num == 0) return COMM_OK; /* No error.. */ for (i = 0; i < num; i++) { int fd = (int) ke[i].ident; PF *hdl = NULL; fde *F = &fd_table[fd]; if (ke[i].flags & EV_ERROR) { errno = ke[i].data; /* XXX error == bad! -- adrian */ continue; /* XXX! */ } switch (ke[i].filter) { case EVFILT_READ: if ((hdl = F->read_handler) != NULL) { F->read_handler = NULL; F->flags.read_pending = 0; hdl(fd, F->read_data); } break; case EVFILT_WRITE: if ((hdl = F->write_handler) != NULL) { F->write_handler = NULL; hdl(fd, F->write_data); } break; default: /* Bad! -- adrian */ debugs(5, 1, "comm_select: kevent returned " << ke[i].filter << "!"); break; } } return COMM_OK; } void comm_quick_poll_required(void) { max_poll_time = 10; } void commKQueueRegisterWithCacheManager(CacheManager & manager) { } #endif /* USE_KQUEUE */