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-rw-r--r--src/ev_kqueue.c386
1 files changed, 386 insertions, 0 deletions
diff --git a/src/ev_kqueue.c b/src/ev_kqueue.c
new file mode 100644
index 0000000..a3591ad
--- /dev/null
+++ b/src/ev_kqueue.c
@@ -0,0 +1,386 @@
+/*
+ * FD polling functions for FreeBSD kqueue()
+ *
+ * Copyright 2000-2014 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.
+ *
+ */
+
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include <sys/event.h>
+#include <sys/time.h>
+
+#include <haproxy/activity.h>
+#include <haproxy/api.h>
+#include <haproxy/clock.h>
+#include <haproxy/fd.h>
+#include <haproxy/global.h>
+#include <haproxy/signal.h>
+#include <haproxy/task.h>
+#include <haproxy/ticks.h>
+
+
+/* private data */
+static int kqueue_fd[MAX_THREADS] __read_mostly; // per-thread kqueue_fd
+static THREAD_LOCAL struct kevent *kev = NULL;
+static struct kevent *kev_out = NULL; // Trash buffer for kevent() to write the eventlist in
+
+static int _update_fd(int fd, int start)
+{
+ int en;
+ int changes = start;
+
+ en = fdtab[fd].state;
+
+ if (!(fdtab[fd].thread_mask & tid_bit) || !(en & FD_EV_ACTIVE_RW)) {
+ if (!(polled_mask[fd].poll_recv & tid_bit) &&
+ !(polled_mask[fd].poll_send & tid_bit)) {
+ /* fd was not watched, it's still not */
+ return changes;
+ }
+ /* fd totally removed from poll list */
+ EV_SET(&kev[changes++], fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
+ EV_SET(&kev[changes++], fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
+ if (polled_mask[fd].poll_recv & tid_bit)
+ _HA_ATOMIC_AND(&polled_mask[fd].poll_recv, ~tid_bit);
+ if (polled_mask[fd].poll_send & tid_bit)
+ _HA_ATOMIC_AND(&polled_mask[fd].poll_send, ~tid_bit);
+ }
+ else {
+ /* OK fd has to be monitored, it was either added or changed */
+
+ if (en & FD_EV_ACTIVE_R) {
+ if (!(polled_mask[fd].poll_recv & tid_bit)) {
+ EV_SET(&kev[changes++], fd, EVFILT_READ, EV_ADD, 0, 0, NULL);
+ _HA_ATOMIC_OR(&polled_mask[fd].poll_recv, tid_bit);
+ }
+ }
+ else if (polled_mask[fd].poll_recv & tid_bit) {
+ EV_SET(&kev[changes++], fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
+ HA_ATOMIC_AND(&polled_mask[fd].poll_recv, ~tid_bit);
+ }
+
+ if (en & FD_EV_ACTIVE_W) {
+ if (!(polled_mask[fd].poll_send & tid_bit)) {
+ EV_SET(&kev[changes++], fd, EVFILT_WRITE, EV_ADD, 0, 0, NULL);
+ _HA_ATOMIC_OR(&polled_mask[fd].poll_send, tid_bit);
+ }
+ }
+ else if (polled_mask[fd].poll_send & tid_bit) {
+ EV_SET(&kev[changes++], fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
+ _HA_ATOMIC_AND(&polled_mask[fd].poll_send, ~tid_bit);
+ }
+
+ }
+ return changes;
+}
+
+/*
+ * kqueue() poller
+ */
+static void _do_poll(struct poller *p, int exp, int wake)
+{
+ int status;
+ int count, fd, wait_time;
+ struct timespec timeout_ts;
+ int updt_idx;
+ int changes = 0;
+ int old_fd;
+
+ timeout_ts.tv_sec = 0;
+ timeout_ts.tv_nsec = 0;
+ /* first, scan the update list to find changes */
+ for (updt_idx = 0; updt_idx < fd_nbupdt; updt_idx++) {
+ fd = fd_updt[updt_idx];
+
+ if (!fd_grab_tgid(fd, 1)) {
+ /* was reassigned */
+ activity[tid].poll_drop_fd++;
+ continue;
+ }
+
+ _HA_ATOMIC_AND(&fdtab[fd].update_mask, ~tid_bit);
+
+ if (fdtab[fd].owner)
+ changes = _update_fd(fd, changes);
+ else
+ activity[tid].poll_drop_fd++;
+
+ fd_drop_tgid(fd);
+ }
+ /* Scan the global update list */
+ for (old_fd = fd = update_list.first; fd != -1; fd = fdtab[fd].update.next) {
+ if (fd == -2) {
+ fd = old_fd;
+ continue;
+ }
+ else if (fd <= -3)
+ fd = -fd -4;
+ if (fd == -1)
+ break;
+
+ if (!fd_grab_tgid(fd, 1)) {
+ /* was reassigned */
+ activity[tid].poll_drop_fd++;
+ continue;
+ }
+
+ if (!(fdtab[fd].update_mask & tid_bit)) {
+ fd_drop_tgid(fd);
+ continue;
+ }
+
+ done_update_polling(fd);
+
+ if (fdtab[fd].owner)
+ changes = _update_fd(fd, changes);
+ else
+ activity[tid].poll_drop_fd++;
+
+ fd_drop_tgid(fd);
+ }
+
+ thread_idle_now();
+ thread_harmless_now();
+
+ if (changes) {
+#ifdef EV_RECEIPT
+ kev[0].flags |= EV_RECEIPT;
+#else
+ /* If EV_RECEIPT isn't defined, just add an invalid entry,
+ * so that we get an error and kevent() stops before scanning
+ * the kqueue.
+ */
+ EV_SET(&kev[changes++], -1, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
+#endif
+ kevent(kqueue_fd[tid], kev, changes, kev_out, changes, &timeout_ts);
+ }
+ fd_nbupdt = 0;
+
+ /* Now let's wait for polled events. */
+ wait_time = wake ? 0 : compute_poll_timeout(exp);
+ fd = global.tune.maxpollevents;
+ clock_entering_poll();
+
+ do {
+ int timeout = (global.tune.options & GTUNE_BUSY_POLLING) ? 0 : wait_time;
+
+ timeout_ts.tv_sec = (timeout / 1000);
+ timeout_ts.tv_nsec = (timeout % 1000) * 1000000;
+
+ status = kevent(kqueue_fd[tid], // int kq
+ NULL, // const struct kevent *changelist
+ 0, // int nchanges
+ kev, // struct kevent *eventlist
+ fd, // int nevents
+ &timeout_ts); // const struct timespec *timeout
+ clock_update_date(timeout, status);
+
+ if (status) {
+ activity[tid].poll_io++;
+ break;
+ }
+ if (timeout || !wait_time)
+ break;
+ if (tick_isset(exp) && tick_is_expired(exp, now_ms))
+ break;
+ } while (1);
+
+ clock_leaving_poll(wait_time, status);
+
+ thread_harmless_end();
+ thread_idle_end();
+
+ if (sleeping_thread_mask & tid_bit)
+ _HA_ATOMIC_AND(&sleeping_thread_mask, ~tid_bit);
+
+ for (count = 0; count < status; count++) {
+ unsigned int n = 0;
+
+ fd = kev[count].ident;
+
+#ifdef DEBUG_FD
+ _HA_ATOMIC_INC(&fdtab[fd].event_count);
+#endif
+ if (kev[count].filter == EVFILT_READ) {
+ if (kev[count].data || !(kev[count].flags & EV_EOF))
+ n |= FD_EV_READY_R;
+ if (kev[count].flags & EV_EOF)
+ n |= FD_EV_SHUT_R;
+ }
+ else if (kev[count].filter == EVFILT_WRITE) {
+ n |= FD_EV_READY_W;
+ if (kev[count].flags & EV_EOF)
+ n |= FD_EV_ERR_RW;
+ }
+
+ fd_update_events(fd, n);
+ }
+}
+
+
+static int init_kqueue_per_thread()
+{
+ int fd;
+
+ /* we can have up to two events per fd, so allocate enough to store
+ * 2*fd event, and an extra one, in case EV_RECEIPT isn't defined,
+ * so that we can add an invalid entry and get an error, to avoid
+ * scanning the kqueue uselessly.
+ */
+ kev = calloc(1, sizeof(struct kevent) * (2 * global.maxsock + 1));
+ if (kev == NULL)
+ goto fail_alloc;
+
+ if (MAX_THREADS > 1 && tid) {
+ kqueue_fd[tid] = kqueue();
+ if (kqueue_fd[tid] < 0)
+ goto fail_fd;
+ }
+
+ /* we may have to unregister some events initially registered on the
+ * original fd when it was alone, and/or to register events on the new
+ * fd for this thread. Let's just mark them as updated, the poller will
+ * do the rest.
+ */
+ for (fd = 0; fd < global.maxsock; fd++)
+ updt_fd_polling(fd);
+
+ return 1;
+ fail_fd:
+ free(kev);
+ fail_alloc:
+ return 0;
+}
+
+static void deinit_kqueue_per_thread()
+{
+ if (MAX_THREADS > 1 && tid)
+ close(kqueue_fd[tid]);
+
+ ha_free(&kev);
+}
+
+/*
+ * 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.
+ */
+static int _do_init(struct poller *p)
+{
+ p->private = NULL;
+
+ /* we can have up to two events per fd, so allocate enough to store
+ * 2*fd event, and an extra one, in case EV_RECEIPT isn't defined,
+ * so that we can add an invalid entry and get an error, to avoid
+ * scanning the kqueue uselessly.
+ */
+ kev_out = calloc(1, sizeof(struct kevent) * (2 * global.maxsock + 1));
+ if (!kev_out)
+ goto fail_alloc;
+
+ kqueue_fd[tid] = kqueue();
+ if (kqueue_fd[tid] < 0)
+ goto fail_fd;
+
+ hap_register_per_thread_init(init_kqueue_per_thread);
+ hap_register_per_thread_deinit(deinit_kqueue_per_thread);
+ return 1;
+
+ fail_fd:
+ ha_free(&kev_out);
+fail_alloc:
+ p->pref = 0;
+ return 0;
+}
+
+/*
+ * Termination of the kqueue() poller.
+ * Memory is released and the poller is marked as unselectable.
+ */
+static void _do_term(struct poller *p)
+{
+ if (kqueue_fd[tid] >= 0) {
+ close(kqueue_fd[tid]);
+ kqueue_fd[tid] = -1;
+ }
+
+ p->private = NULL;
+ p->pref = 0;
+ if (kev_out) {
+ ha_free(&kev_out);
+ }
+}
+
+/*
+ * Check that the poller works.
+ * Returns 1 if OK, otherwise 0.
+ */
+static int _do_test(struct poller *p)
+{
+ int fd;
+
+ fd = kqueue();
+ if (fd < 0)
+ return 0;
+ close(fd);
+ return 1;
+}
+
+/*
+ * Recreate the kqueue file descriptor after a fork(). Returns 1 if OK,
+ * otherwise 0. Note that some pollers need to be reopened after a fork()
+ * (such as kqueue), and some others may fail to do so in a chroot.
+ */
+static int _do_fork(struct poller *p)
+{
+ kqueue_fd[tid] = kqueue();
+ if (kqueue_fd[tid] < 0)
+ return 0;
+ return 1;
+}
+
+/*
+ * Registers the poller.
+ */
+static void _do_register(void)
+{
+ struct poller *p;
+ int i;
+
+ if (nbpollers >= MAX_POLLERS)
+ return;
+
+ for (i = 0; i < MAX_THREADS; i++)
+ kqueue_fd[i] = -1;
+
+ p = &pollers[nbpollers++];
+
+ p->name = "kqueue";
+ p->pref = 300;
+ p->flags = HAP_POLL_F_RDHUP | HAP_POLL_F_ERRHUP;
+ p->private = NULL;
+
+ p->clo = NULL;
+ p->test = _do_test;
+ p->init = _do_init;
+ p->term = _do_term;
+ p->poll = _do_poll;
+ p->fork = _do_fork;
+}
+
+INITCALL0(STG_REGISTER, _do_register);
+
+/*
+ * Local variables:
+ * c-indent-level: 8
+ * c-basic-offset: 8
+ * End:
+ */
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