--- /dev/null
+/*
+ * FD polling functions for FreeBSD kqueue()
+ *
+ * Copyright 2000-2007 Willy Tarreau <w@1wt.eu>
+ *
+ * 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.
+ *
+ * Note: not knowing much about kqueue, I had to rely on OpenBSD's detailed man
+ * page and to check how it was implemented in lighttpd to understand it better.
+ * But it is possible that I got things wrong.
+ *
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include <sys/event.h>
+#include <sys/time.h>
+
+#include <common/compat.h>
+#include <common/config.h>
+#include <common/time.h>
+
+#include <types/fd.h>
+#include <types/global.h>
+
+#include <proto/fd.h>
+#include <proto/polling.h>
+#include <proto/task.h>
+
+/* private data */
+static fd_set *fd_evts[2];
+static int kqueue_fd;
+static struct kevent *kev = NULL;
+
+/* speeds up conversion of DIR_RD/DIR_WR to EVFILT* */
+static const int dir2filt[2] = { EVFILT_READ, EVFILT_WRITE };
+
+/* completes a change list for deletion */
+REGPRM3 static int kqev_del(struct kevent *kev, const int fd, const int dir)
+{
+ if (FD_ISSET(fd, fd_evts[dir])) {
+ FD_CLR(fd, fd_evts[dir]);
+ EV_SET(kev, fd, dir2filt[dir], EV_DELETE, 0, 0, NULL);
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Returns non-zero if direction <dir> is already set for <fd>.
+ */
+REGPRM2 static int __fd_isset(const int fd, int dir)
+{
+ return FD_ISSET(fd, fd_evts[dir]);
+}
+
+REGPRM2 static int __fd_set(const int fd, int dir)
+{
+ /* if the value was set, do nothing */
+ if (FD_ISSET(fd, fd_evts[dir]))
+ return 0;
+
+ FD_SET(fd, fd_evts[dir]);
+ EV_SET(kev, fd, dir2filt[dir], EV_ADD|EV_CLEAR, 0, 0, NULL);
+ kevent(kqueue_fd, kev, 1, NULL, 0, NULL);
+ return 1;
+}
+
+REGPRM2 static int __fd_clr(const int fd, int dir)
+{
+ /* if the value was not set, do nothing */
+ //if (!FD_ISSET(fd, fd_evts[dir]))
+ // return 0;
+ //
+ //FD_CLR(fd, fd_evts[dir]);
+ //EV_SET(&kev, fd, dir2filt[dir], EV_DELETE, 0, 0, NULL);
+ //kevent(kqueue_fd, &kev, 1, NULL, 0, NULL);
+ //return 1;
+ if (!kqev_del(kev, fd, dir))
+ return 0;
+ kevent(kqueue_fd, kev, 1, NULL, 0, NULL);
+ return 1;
+}
+
+REGPRM1 static void __fd_rem(int fd)
+{
+ int changes = 0;
+
+ //if (FD_ISSET(fd, fd_evts[DIR_RD])) {
+ // FD_CLR(fd, fd_evts[DIR_RD]);
+ // EV_SET(&kev[changes], fd, dir2filt[DIR_RD], EV_DELETE, 0, 0, NULL);
+ // changes++;
+ //}
+ //if (FD_ISSET(fd, fd_evts[DIR_WR])) {
+ // FD_CLR(fd, fd_evts[DIR_WR]);
+ // EV_SET(&kev[changes], fd, dir2filt[DIR_WR], EV_DELETE, 0, 0, NULL);
+ // changes++;
+ //}
+ changes += kqev_del(&kev[changes], fd, DIR_RD);
+ changes += kqev_del(&kev[changes], fd, DIR_WR);
+
+ if (changes)
+ kevent(kqueue_fd, kev, changes, NULL, 0, NULL);
+}
+
+/*
+ * kqueue() poller
+ */
+REGPRM2 static void kqueue_poll(struct poller *p, int wait_time)
+{
+ int status;
+ int count, fd;
+ struct timespec timeout;
+
+ timeout.tv_sec = wait_time / 1000;
+ timeout.tv_nsec = (wait_time % 1000) * 1000000;
+
+ status = kevent(kqueue_fd, // int kq
+ NULL, // const struct kevent *changelist
+ 0, // int nchanges
+ kev, // struct kevent *eventlist
+ maxfd, // int nevents
+ &timeout); // const struct timespec *timeout
+
+ for (count = 0; count < status; count++) {
+ fd = kev[count].ident;
+ if (kev[count].filter == EVFILT_READ) {
+ if (FD_ISSET(fd, fd_evts[DIR_RD])) {
+ if (fdtab[fd].state == FD_STCLOSE)
+ continue;
+ fdtab[fd].cb[DIR_RD].f(fd);
+ }
+ } else if (kev[count].filter == EVFILT_WRITE) {
+ if (FD_ISSET(fd, fd_evts[DIR_WR])) {
+ if (fdtab[fd].state == FD_STCLOSE)
+ continue;
+ fdtab[fd].cb[DIR_WR].f(fd);
+ }
+ }
+ }
+}
+
+/*
+ * Initialization of the kqueue() poller.
+ * Returns 0 in case of failure, non-zero in case of success. If it fails, it
+ * disables the poller by setting its pref to 0.
+ */
+REGPRM1 static int kqueue_init(struct poller *p)
+{
+ __label__ fail_wevt, fail_revt, fail_fd;
+ int fd_set_bytes;
+
+ p->private = NULL;
+ fd_set_bytes = sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE;
+
+ kqueue_fd = kqueue();
+ if (kqueue_fd < 0)
+ goto fail_fd;
+
+ kev = (struct kevent*)calloc(1, sizeof(struct kevent) * global.maxsock);
+
+ if (kev == NULL)
+ goto fail_kev;
+
+ if ((fd_evts[DIR_RD] = (fd_set *)calloc(1, fd_set_bytes)) == NULL)
+ goto fail_revt;
+
+ if ((fd_evts[DIR_WR] = (fd_set *)calloc(1, fd_set_bytes)) == NULL)
+ goto fail_wevt;
+
+ return 1;
+
+ fail_wevt:
+ free(fd_evts[DIR_RD]);
+ fail_revt:
+ free(kev);
+ fail_kev:
+ close(kqueue_fd);
+ kqueue_fd = 0;
+ fail_fd:
+ p->pref = 0;
+ return 0;
+}
+
+/*
+ * Termination of the kqueue() poller.
+ * Memory is released and the poller is marked as unselectable.
+ */
+REGPRM1 static void kqueue_term(struct poller *p)
+{
+ if (fd_evts[DIR_WR])
+ free(fd_evts[DIR_WR]);
+ if (fd_evts[DIR_RD])
+ free(fd_evts[DIR_RD]);
+ if (kev)
+ free(kev);
+ close(kqueue_fd);
+ kqueue_fd = 0;
+
+ p->private = NULL;
+ p->pref = 0;
+}
+
+/*
+ * The only exported function. Returns 1.
+ */
+//int kqueue_native_register(struct poller *p)
+int kqueue_register(struct poller *p)
+{
+ p->name = "kqueue";
+ p->pref = 300;
+ p->private = NULL;
+
+ p->init = kqueue_init;
+ p->term = kqueue_term;
+ p->poll = kqueue_poll;
+
+ p->isset = __fd_isset;
+ p->cond_s = p->set = __fd_set;
+ p->cond_c = p->clr = __fd_clr;
+ p->clo = p->rem = __fd_rem;
+
+ return 1;
+}
+
+
+/*
+ * Local variables:
+ * c-indent-level: 8
+ * c-basic-offset: 8
+ * End:
+ */
projects / thirdparty / haproxy.git / commitdiff
