416 lines
11 KiB
C
416 lines
11 KiB
C
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/*
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* Copyright (C) 2002-2003 Igor Sysoev, http://sysoev.ru
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_connection.h>
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#include <ngx_event.h>
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#include <ngx_kqueue_module.h>
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static int ngx_kqueue_init(ngx_log_t *log);
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static void ngx_kqueue_done(ngx_log_t *log);
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static int ngx_kqueue_add_event(ngx_event_t *ev, int event, u_int flags);
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static int ngx_kqueue_del_event(ngx_event_t *ev, int event, u_int flags);
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static int ngx_kqueue_set_event(ngx_event_t *ev, int filter, u_int flags);
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static int ngx_kqueue_process_events(ngx_log_t *log);
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static void *ngx_kqueue_create_conf(ngx_pool_t *pool);
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static char *ngx_kqueue_init_conf(ngx_pool_t *pool, void *conf);
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int ngx_kqueue;
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static struct kevent *change_list, *event_list;
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static u_int max_changes, nchanges;
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static int nevents;
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static ngx_str_t kqueue_name = ngx_string("kqueue");
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static ngx_command_t ngx_kqueue_commands[] = {
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{ngx_string("kqueue_changes"),
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NGX_EVENT_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_num_slot,
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0,
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offsetof(ngx_kqueue_conf_t, changes),
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NULL},
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{ngx_string("kqueue_events"),
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NGX_EVENT_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_num_slot,
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0,
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offsetof(ngx_kqueue_conf_t, events),
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NULL},
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{ngx_string(""), 0, NULL, 0, 0, NULL}
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};
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ngx_event_module_t ngx_kqueue_module_ctx = {
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NGX_EVENT_MODULE,
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&kqueue_name,
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ngx_kqueue_create_conf, /* create configuration */
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ngx_kqueue_init_conf, /* init configuration */
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{
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ngx_kqueue_add_event, /* add an event */
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ngx_kqueue_del_event, /* delete an event */
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ngx_kqueue_add_event, /* enable an event */
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ngx_kqueue_del_event, /* disable an event */
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NULL, /* add an connection */
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NULL, /* delete an connection */
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ngx_kqueue_process_events, /* process the events */
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ngx_kqueue_init, /* init the events */
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ngx_kqueue_done, /* done the events */
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}
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};
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ngx_module_t ngx_kqueue_module = {
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&ngx_kqueue_module_ctx, /* module context */
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0, /* module index */
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ngx_kqueue_commands, /* module directives */
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NGX_EVENT_MODULE_TYPE, /* module type */
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NULL /* init module */
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};
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static int ngx_kqueue_init(ngx_log_t *log)
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{
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ngx_kqueue_conf_t *kcf;
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kcf = ngx_event_get_conf(ngx_kqueue_module_ctx);
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ngx_log_debug(log, "CH: %d" _ kcf->changes);
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ngx_log_debug(log, "EV: %d" _ kcf->events);
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max_changes = kcf->changes;
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nevents = kcf->events;
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nchanges = 0;
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ngx_kqueue = kqueue();
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if (ngx_kqueue == -1) {
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ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "kqueue() failed");
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return NGX_ERROR;
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}
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ngx_test_null(change_list,
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ngx_alloc(kcf->changes * sizeof(struct kevent), log),
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NGX_ERROR);
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ngx_test_null(event_list,
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ngx_alloc(kcf->events * sizeof(struct kevent), log),
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NGX_ERROR);
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if (ngx_event_timer_init(log) == NGX_ERROR) {
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return NGX_ERROR;
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}
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ngx_event_actions = ngx_kqueue_module_ctx.actions;
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ngx_event_flags = NGX_HAVE_LEVEL_EVENT
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|NGX_HAVE_ONESHOT_EVENT
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#if (HAVE_CLEAR_EVENT)
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|NGX_HAVE_CLEAR_EVENT
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#else
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|NGX_USE_LEVEL_EVENT
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#endif
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#if (HAVE_LOWAT_EVENT)
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|NGX_HAVE_LOWAT_EVENT
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#endif
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|NGX_HAVE_KQUEUE_EVENT;
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return NGX_OK;
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}
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static void ngx_kqueue_done(ngx_log_t *log)
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{
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if (close(ngx_kqueue) == -1) {
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ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "kqueue close() failed");
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}
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ngx_event_timer_done(log);
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ngx_free(change_list);
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ngx_free(event_list);
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}
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static int ngx_kqueue_add_event(ngx_event_t *ev, int event, u_int flags)
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{
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ngx_connection_t *c;
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ev->active = 1;
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ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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if (nchanges > 0
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&& ev->index < nchanges
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&& (void *) ((uintptr_t) change_list[ev->index].udata & ~1) == ev)
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{
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c = ev->data;
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ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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"previous event were not passed in kernel", c->fd);
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return NGX_ERROR;
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}
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return ngx_kqueue_set_event(ev, event, EV_ADD | flags);
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}
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static int ngx_kqueue_del_event(ngx_event_t *ev, int event, u_int flags)
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{
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ngx_event_t *e;
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ev->active = 0;
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if (nchanges > 0
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&& ev->index < nchanges
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&& (void *) ((uintptr_t) change_list[ev->index].udata & ~1) == ev)
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{
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#if (NGX_DEBUG_EVENT)
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ngx_connection_t *c = (ngx_connection_t *) ev->data;
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ngx_log_debug(ev->log, "kqueue event deleted: %d: ft:%d" _
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c->fd _ event);
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#endif
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/* if the event is still not passed to a kernel we will not pass it */
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if (ev->index < --nchanges) {
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e = (ngx_event_t *) change_list[nchanges].udata;
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change_list[ev->index] = change_list[nchanges];
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e->index = ev->index;
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}
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return NGX_OK;
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}
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/* when the file descriptor is closed a kqueue automatically deletes
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its filters so we do not need to delete explicity the event
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before the closing the file descriptor */
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if (flags & NGX_CLOSE_EVENT) {
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return NGX_OK;
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}
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return ngx_kqueue_set_event(ev, event, EV_DELETE);
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}
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static int ngx_kqueue_set_event(ngx_event_t *ev, int filter, u_int flags)
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{
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struct timespec ts;
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ngx_connection_t *c;
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c = ev->data;
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#if (NGX_DEBUG_EVENT)
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ngx_log_debug(ev->log, "kqueue set event: %d: ft:%d f:%08x" _
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c->fd _ filter _ flags);
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#endif
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if (nchanges >= max_changes) {
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ngx_log_error(NGX_LOG_WARN, ev->log, 0,
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"kqueue change list is filled up");
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ts.tv_sec = 0;
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ts.tv_nsec = 0;
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if (kevent(ngx_kqueue, change_list, nchanges, NULL, 0, &ts) == -1) {
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ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "kevent failed");
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return NGX_ERROR;
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}
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nchanges = 0;
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}
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change_list[nchanges].ident = c->fd;
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change_list[nchanges].filter = filter;
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change_list[nchanges].flags = flags;
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change_list[nchanges].udata = (void *) ((uintptr_t) ev | ev->instance);
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#if (HAVE_LOWAT_EVENT)
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if ((flags & EV_ADD) && ev->lowat > 0) {
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change_list[nchanges].fflags = NOTE_LOWAT;
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change_list[nchanges].data = ev->lowat;
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} else {
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change_list[nchanges].fflags = 0;
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change_list[nchanges].data = 0;
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}
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#else
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change_list[nchanges].fflags = 0;
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change_list[nchanges].data = 0;
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#endif
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ev->index = nchanges;
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nchanges++;
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return NGX_OK;
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}
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static int ngx_kqueue_process_events(ngx_log_t *log)
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{
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int events, instance, i;
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ngx_msec_t timer, delta;
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ngx_event_t *ev;
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struct timeval tv;
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struct timespec ts, *tp;
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timer = ngx_event_find_timer();
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if (timer) {
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ts.tv_sec = timer / 1000;
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ts.tv_nsec = (timer % 1000) * 1000000;
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tp = &ts;
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gettimeofday(&tv, NULL);
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delta = tv.tv_sec * 1000 + tv.tv_usec / 1000;
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} else {
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timer = 0;
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delta = 0;
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tp = NULL;
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}
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#if (NGX_DEBUG_EVENT)
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ngx_log_debug(log, "kevent timer: %d" _ timer);
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#endif
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events = kevent(ngx_kqueue, change_list, nchanges, event_list, nevents, tp);
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if (events == -1) {
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ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "kevent failed");
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return NGX_ERROR;
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}
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nchanges = 0;
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if (timer) {
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gettimeofday(&tv, NULL);
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delta = tv.tv_sec * 1000 + tv.tv_usec / 1000 - delta;
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/* The expired timers must be handled before a processing of the events
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because the new timers can be added during a processing */
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ngx_event_expire_timers(delta);
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} else {
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if (events == 0) {
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ngx_log_error(NGX_LOG_ALERT, log, 0,
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"kevent returns no events without timeout");
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return NGX_ERROR;
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}
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}
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#if (NGX_DEBUG_EVENT)
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ngx_log_debug(log, "kevent timer: %d, delta: %d" _ timer _ delta);
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#endif
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for (i = 0; i < events; i++) {
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#if (NGX_DEBUG_EVENT)
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if (event_list[i].ident > 0x8000000) {
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ngx_log_debug(log,
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"kevent: %08x: ft:%d f:%08x ff:%08x d:%d ud:%08x" _
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event_list[i].ident _ event_list[i].filter _
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event_list[i].flags _ event_list[i].fflags _
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event_list[i].data _ event_list[i].udata);
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} else {
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ngx_log_debug(log,
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"kevent: %d: ft:%d f:%08x ff:%08x d:%d ud:%08x" _
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event_list[i].ident _ event_list[i].filter _
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event_list[i].flags _ event_list[i].fflags _
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event_list[i].data _ event_list[i].udata);
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}
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#endif
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if (event_list[i].flags & EV_ERROR) {
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ngx_log_error(NGX_LOG_ALERT, log, event_list[i].data,
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"kevent error on %d", event_list[i].ident);
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continue;
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}
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ev = (ngx_event_t *) event_list[i].udata;
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instance = (uintptr_t) ev & 1;
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ev = (void *) ((uintptr_t) ev & ~1);
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/* It's a stale event from a file descriptor
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that was just closed in this iteration */
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if (ev->active == 0 || ev->instance != instance) {
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ngx_log_debug(log, "stale kevent");
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continue;
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}
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switch (event_list[i].filter) {
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case EVFILT_READ:
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case EVFILT_WRITE:
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ev->available = event_list[i].data;
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if (event_list[i].flags & EV_EOF) {
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ev->eof = 1;
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ev->error = event_list[i].fflags;
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}
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if (ev->oneshot && ev->timer_set) {
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ngx_del_timer(ev);
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ev->timer_set = 0;
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}
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/* fall through */
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case EVFILT_AIO:
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ev->ready = 1;
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ev->event_handler(ev);
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break;
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default:
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ngx_log_error(NGX_LOG_ALERT, log, 0,
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"unknown kevent filter %d" _ event_list[i].filter);
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}
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}
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return NGX_OK;
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}
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static void *ngx_kqueue_create_conf(ngx_pool_t *pool)
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{
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ngx_kqueue_conf_t *kcf;
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ngx_test_null(kcf, ngx_palloc(pool, sizeof(ngx_kqueue_conf_t)),
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NGX_CONF_ERROR);
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kcf->changes = NGX_CONF_UNSET;
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kcf->events = NGX_CONF_UNSET;
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return kcf;
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}
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static char *ngx_kqueue_init_conf(ngx_pool_t *pool, void *conf)
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{
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ngx_kqueue_conf_t *kcf = conf;
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ngx_conf_init_value(kcf->changes, 512);
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ngx_conf_init_value(kcf->events, 512);
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return NGX_CONF_OK;
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}
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