Mercurial > hg > nginx-quic
view src/event/modules/ngx_kqueue_module.c @ 3167:7d1f9a449603
we do not need to increase request counter in this place,
the bug had appeared in r3115
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Mon, 28 Sep 2009 11:12:45 +0000 |
parents | a1d54c705f38 |
children | 0299cf5856fc |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> typedef struct { ngx_uint_t changes; ngx_uint_t events; } ngx_kqueue_conf_t; static ngx_int_t ngx_kqueue_init(ngx_cycle_t *cycle, ngx_msec_t timer); static void ngx_kqueue_done(ngx_cycle_t *cycle); static ngx_int_t ngx_kqueue_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags); static ngx_int_t ngx_kqueue_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags); static ngx_int_t ngx_kqueue_set_event(ngx_event_t *ev, ngx_int_t filter, ngx_uint_t flags); static ngx_int_t ngx_kqueue_process_changes(ngx_cycle_t *cycle, ngx_uint_t try); static ngx_int_t ngx_kqueue_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags); static ngx_inline void ngx_kqueue_dump_event(ngx_log_t *log, struct kevent *kev); static void *ngx_kqueue_create_conf(ngx_cycle_t *cycle); static char *ngx_kqueue_init_conf(ngx_cycle_t *cycle, void *conf); int ngx_kqueue = -1; /* * The "change_list" should be declared as ngx_thread_volatile. * However, the use of the change_list is localized in kqueue functions and * is protected by the mutex so even the "icc -ipo" should not build the code * with the race condition. Thus we avoid the declaration to make a more * readable code. */ static struct kevent *change_list, *change_list0, *change_list1; static struct kevent *event_list; static ngx_uint_t max_changes, nchanges, nevents; #if (NGX_THREADS) static ngx_mutex_t *list_mutex; static ngx_mutex_t *kevent_mutex; #endif static ngx_str_t kqueue_name = ngx_string("kqueue"); static ngx_command_t ngx_kqueue_commands[] = { { ngx_string("kqueue_changes"), NGX_EVENT_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, 0, offsetof(ngx_kqueue_conf_t, changes), NULL }, { ngx_string("kqueue_events"), NGX_EVENT_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, 0, offsetof(ngx_kqueue_conf_t, events), NULL }, ngx_null_command }; ngx_event_module_t ngx_kqueue_module_ctx = { &kqueue_name, ngx_kqueue_create_conf, /* create configuration */ ngx_kqueue_init_conf, /* init configuration */ { ngx_kqueue_add_event, /* add an event */ ngx_kqueue_del_event, /* delete an event */ ngx_kqueue_add_event, /* enable an event */ ngx_kqueue_del_event, /* disable an event */ NULL, /* add an connection */ NULL, /* delete an connection */ ngx_kqueue_process_changes, /* process the changes */ ngx_kqueue_process_events, /* process the events */ ngx_kqueue_init, /* init the events */ ngx_kqueue_done /* done the events */ } }; ngx_module_t ngx_kqueue_module = { NGX_MODULE_V1, &ngx_kqueue_module_ctx, /* module context */ ngx_kqueue_commands, /* module directives */ NGX_EVENT_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_int_t ngx_kqueue_init(ngx_cycle_t *cycle, ngx_msec_t timer) { ngx_kqueue_conf_t *kcf; struct timespec ts; #if (NGX_HAVE_TIMER_EVENT) struct kevent kev; #endif kcf = ngx_event_get_conf(cycle->conf_ctx, ngx_kqueue_module); if (ngx_kqueue == -1) { ngx_kqueue = kqueue(); if (ngx_kqueue == -1) { ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno, "kqueue() failed"); return NGX_ERROR; } #if (NGX_THREADS) list_mutex = ngx_mutex_init(cycle->log, 0); if (list_mutex == NULL) { return NGX_ERROR; } kevent_mutex = ngx_mutex_init(cycle->log, 0); if (kevent_mutex == NULL) { return NGX_ERROR; } #endif } if (max_changes < kcf->changes) { if (nchanges) { ts.tv_sec = 0; ts.tv_nsec = 0; if (kevent(ngx_kqueue, change_list, (int) nchanges, NULL, 0, &ts) == -1) { ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, "kevent() failed"); return NGX_ERROR; } nchanges = 0; } if (change_list0) { ngx_free(change_list0); } change_list0 = ngx_alloc(kcf->changes * sizeof(struct kevent), cycle->log); if (change_list0 == NULL) { return NGX_ERROR; } if (change_list1) { ngx_free(change_list1); } change_list1 = ngx_alloc(kcf->changes * sizeof(struct kevent), cycle->log); if (change_list1 == NULL) { return NGX_ERROR; } change_list = change_list0; } max_changes = kcf->changes; if (nevents < kcf->events) { if (event_list) { ngx_free(event_list); } event_list = ngx_alloc(kcf->events * sizeof(struct kevent), cycle->log); if (event_list == NULL) { return NGX_ERROR; } } ngx_event_flags = NGX_USE_ONESHOT_EVENT |NGX_USE_KQUEUE_EVENT |NGX_USE_VNODE_EVENT; #if (NGX_HAVE_TIMER_EVENT) if (timer) { kev.ident = 0; kev.filter = EVFILT_TIMER; kev.flags = EV_ADD|EV_ENABLE; kev.fflags = 0; kev.data = timer; kev.udata = 0; ts.tv_sec = 0; ts.tv_nsec = 0; if (kevent(ngx_kqueue, &kev, 1, NULL, 0, &ts) == -1) { ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, "kevent(EVFILT_TIMER) failed"); return NGX_ERROR; } ngx_event_flags |= NGX_USE_TIMER_EVENT; } #endif #if (NGX_HAVE_CLEAR_EVENT) ngx_event_flags |= NGX_USE_CLEAR_EVENT; #else ngx_event_flags |= NGX_USE_LEVEL_EVENT; #endif #if (NGX_HAVE_LOWAT_EVENT) ngx_event_flags |= NGX_USE_LOWAT_EVENT; #endif nevents = kcf->events; ngx_io = ngx_os_io; ngx_event_actions = ngx_kqueue_module_ctx.actions; return NGX_OK; } static void ngx_kqueue_done(ngx_cycle_t *cycle) { if (close(ngx_kqueue) == -1) { ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, "kqueue close() failed"); } ngx_kqueue = -1; #if (NGX_THREADS) ngx_mutex_destroy(kevent_mutex); ngx_mutex_destroy(list_mutex); #endif ngx_free(change_list1); ngx_free(change_list0); ngx_free(event_list); change_list1 = NULL; change_list0 = NULL; change_list = NULL; event_list = NULL; max_changes = 0; nchanges = 0; nevents = 0; } static ngx_int_t ngx_kqueue_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags) { ngx_int_t rc; #if 0 ngx_event_t *e; ngx_connection_t *c; #endif ev->active = 1; ev->disabled = 0; ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0; ngx_mutex_lock(list_mutex); #if 0 if (ev->index < nchanges && ((uintptr_t) change_list[ev->index].udata & (uintptr_t) ~1) == (uintptr_t) ev) { if (change_list[ev->index].flags == EV_DISABLE) { /* * if the EV_DISABLE is still not passed to a kernel * we will not pass it */ ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, "kevent activated: %d: ft:%i", ngx_event_ident(ev->data), event); if (ev->index < --nchanges) { e = (ngx_event_t *) ((uintptr_t) change_list[nchanges].udata & (uintptr_t) ~1); change_list[ev->index] = change_list[nchanges]; e->index = ev->index; } ngx_mutex_unlock(list_mutex); return NGX_OK; } c = ev->data; ngx_log_error(NGX_LOG_ALERT, ev->log, 0, "previous event on #%d were not passed in kernel", c->fd); ngx_mutex_unlock(list_mutex); return NGX_ERROR; } #endif rc = ngx_kqueue_set_event(ev, event, EV_ADD|EV_ENABLE|flags); ngx_mutex_unlock(list_mutex); return rc; } static ngx_int_t ngx_kqueue_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags) { ngx_int_t rc; ngx_event_t *e; ev->active = 0; ev->disabled = 0; ngx_mutex_lock(list_mutex); if (ev->index < nchanges && ((uintptr_t) change_list[ev->index].udata & (uintptr_t) ~1) == (uintptr_t) ev) { ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, "kevent deleted: %d: ft:%i", ngx_event_ident(ev->data), event); /* if the event is still not passed to a kernel we will not pass it */ nchanges--; if (ev->index < nchanges) { e = (ngx_event_t *) ((uintptr_t) change_list[nchanges].udata & (uintptr_t) ~1); change_list[ev->index] = change_list[nchanges]; e->index = ev->index; } ngx_mutex_unlock(list_mutex); return NGX_OK; } /* * when the file descriptor is closed the kqueue automatically deletes * its filters so we do not need to delete explicity the event * before the closing the file descriptor. */ if (flags & NGX_CLOSE_EVENT) { ngx_mutex_unlock(list_mutex); return NGX_OK; } if (flags & NGX_DISABLE_EVENT) { ev->disabled = 1; } else { flags |= EV_DELETE; } rc = ngx_kqueue_set_event(ev, event, flags); ngx_mutex_unlock(list_mutex); return rc; } static ngx_int_t ngx_kqueue_set_event(ngx_event_t *ev, ngx_int_t filter, ngx_uint_t flags) { struct kevent *kev; struct timespec ts; ngx_connection_t *c; c = ev->data; ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0, "kevent set event: %d: ft:%i fl:%04Xi", c->fd, filter, flags); if (nchanges >= max_changes) { ngx_log_error(NGX_LOG_WARN, ev->log, 0, "kqueue change list is filled up"); ts.tv_sec = 0; ts.tv_nsec = 0; if (kevent(ngx_kqueue, change_list, (int) nchanges, NULL, 0, &ts) == -1) { ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "kevent() failed"); return NGX_ERROR; } nchanges = 0; } kev = &change_list[nchanges]; kev->ident = c->fd; kev->filter = (short) filter; kev->flags = (u_short) flags; kev->udata = NGX_KQUEUE_UDATA_T ((uintptr_t) ev | ev->instance); if (filter == EVFILT_VNODE) { kev->fflags = NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND |NOTE_ATTRIB|NOTE_RENAME #if (__FreeBSD__ == 4 && __FreeBSD_version >= 430000) \ || __FreeBSD_version >= 500018 |NOTE_REVOKE #endif ; kev->data = 0; } else { #if (NGX_HAVE_LOWAT_EVENT) if (flags & NGX_LOWAT_EVENT) { kev->fflags = NOTE_LOWAT; kev->data = ev->available; } else { kev->fflags = 0; kev->data = 0; } #else kev->fflags = 0; kev->data = 0; #endif } ev->index = nchanges; nchanges++; if (flags & NGX_FLUSH_EVENT) { ts.tv_sec = 0; ts.tv_nsec = 0; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, 0, "kevent flush"); if (kevent(ngx_kqueue, change_list, (int) nchanges, NULL, 0, &ts) == -1) { ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "kevent() failed"); return NGX_ERROR; } nchanges = 0; } return NGX_OK; } static ngx_int_t ngx_kqueue_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags) { int events, n; ngx_int_t i, instance; ngx_uint_t level; ngx_err_t err; ngx_event_t *ev, **queue; struct timespec ts, *tp; if (ngx_threaded) { if (ngx_kqueue_process_changes(cycle, 0) == NGX_ERROR) { return NGX_ERROR; } n = 0; } else { n = (int) nchanges; nchanges = 0; } if (timer == NGX_TIMER_INFINITE) { tp = NULL; } else { ts.tv_sec = timer / 1000; ts.tv_nsec = (timer % 1000) * 1000000; /* * 64-bit Darwin kernel has the bug: kernel level ts.tv_nsec is * the int32_t while user level ts.tv_nsec is the long (64-bit), * so on the big endian PowerPC all nanoseconds are lost. */ #if (NGX_DARWIN_KEVENT_BUG) ts.tv_nsec <<= 32; #endif tp = &ts; } ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "kevent timer: %M, changes: %d", timer, n); events = kevent(ngx_kqueue, change_list, n, event_list, (int) nevents, tp); err = (events == -1) ? ngx_errno : 0; if (flags & NGX_UPDATE_TIME) { ngx_time_update(0, 0); } ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "kevent events: %d", events); if (err) { if (err == NGX_EINTR) { if (ngx_event_timer_alarm) { ngx_event_timer_alarm = 0; return NGX_OK; } level = NGX_LOG_INFO; } else { level = NGX_LOG_ALERT; } ngx_log_error(level, cycle->log, err, "kevent() failed"); return NGX_ERROR; } if (events == 0) { if (timer != NGX_TIMER_INFINITE) { return NGX_OK; } ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "kevent() returned no events without timeout"); return NGX_ERROR; } ngx_mutex_lock(ngx_posted_events_mutex); for (i = 0; i < events; i++) { ngx_kqueue_dump_event(cycle->log, &event_list[i]); if (event_list[i].flags & EV_ERROR) { ngx_log_error(NGX_LOG_ALERT, cycle->log, event_list[i].data, "kevent() error on %d filter:%d flags:%04Xd", event_list[i].ident, event_list[i].filter, event_list[i].flags); continue; } #if (NGX_HAVE_TIMER_EVENT) if (event_list[i].filter == EVFILT_TIMER) { ngx_time_update(0, 0); continue; } #endif ev = (ngx_event_t *) event_list[i].udata; switch (event_list[i].filter) { case EVFILT_READ: case EVFILT_WRITE: instance = (uintptr_t) ev & 1; ev = (ngx_event_t *) ((uintptr_t) ev & (uintptr_t) ~1); if (ev->closed || ev->instance != instance) { /* * the stale event from a file descriptor * that was just closed in this iteration */ ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "kevent: stale event %p", ev); continue; } if (ev->log && (ev->log->log_level & NGX_LOG_DEBUG_CONNECTION)) { ngx_kqueue_dump_event(ev->log, &event_list[i]); } if (ev->oneshot) { ev->active = 0; } #if (NGX_THREADS) if ((flags & NGX_POST_THREAD_EVENTS) && !ev->accept) { ev->posted_ready = 1; ev->posted_available = event_list[i].data; if (event_list[i].flags & EV_EOF) { ev->posted_eof = 1; ev->posted_errno = event_list[i].fflags; } ngx_locked_post_event(ev, &ngx_posted_events); continue; } #endif ev->available = event_list[i].data; if (event_list[i].flags & EV_EOF) { ev->pending_eof = 1; ev->kq_errno = event_list[i].fflags; } ev->ready = 1; break; case EVFILT_VNODE: ev->kq_vnode = 1; break; case EVFILT_AIO: ev->complete = 1; ev->ready = 1; break; default: ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected kevent() filter %d", event_list[i].filter); continue; } if (flags & NGX_POST_EVENTS) { queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events: &ngx_posted_events); ngx_locked_post_event(ev, queue); continue; } ev->handler(ev); } ngx_mutex_unlock(ngx_posted_events_mutex); return NGX_OK; } static ngx_int_t ngx_kqueue_process_changes(ngx_cycle_t *cycle, ngx_uint_t try) { int n; ngx_int_t rc; ngx_err_t err; struct timespec ts; struct kevent *changes; ngx_mutex_lock(kevent_mutex); ngx_mutex_lock(list_mutex); if (nchanges == 0) { ngx_mutex_unlock(list_mutex); ngx_mutex_unlock(kevent_mutex); return NGX_OK; } changes = change_list; if (change_list == change_list0) { change_list = change_list1; } else { change_list = change_list0; } n = (int) nchanges; nchanges = 0; ngx_mutex_unlock(list_mutex); ts.tv_sec = 0; ts.tv_nsec = 0; ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "kevent changes: %d", n); if (kevent(ngx_kqueue, changes, n, NULL, 0, &ts) == -1) { err = ngx_errno; ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT, cycle->log, err, "kevent() failed"); rc = NGX_ERROR; } else { rc = NGX_OK; } ngx_mutex_unlock(kevent_mutex); return rc; } static ngx_inline void ngx_kqueue_dump_event(ngx_log_t *log, struct kevent *kev) { ngx_log_debug6(NGX_LOG_DEBUG_EVENT, log, 0, (kev->ident > 0x8000000 && kev->ident != (unsigned) -1) ? "kevent: %p: ft:%d fl:%04Xd ff:%08Xd d:%d ud:%p": "kevent: %d: ft:%d fl:%04Xd ff:%08Xd d:%d ud:%p", kev->ident, kev->filter, kev->flags, kev->fflags, kev->data, kev->udata); } static void * ngx_kqueue_create_conf(ngx_cycle_t *cycle) { ngx_kqueue_conf_t *kcf; kcf = ngx_palloc(cycle->pool, sizeof(ngx_kqueue_conf_t)); if (kcf == NULL) { return NULL; } kcf->changes = NGX_CONF_UNSET; kcf->events = NGX_CONF_UNSET; return kcf; } static char * ngx_kqueue_init_conf(ngx_cycle_t *cycle, void *conf) { ngx_kqueue_conf_t *kcf = conf; ngx_conf_init_uint_value(kcf->changes, 512); ngx_conf_init_uint_value(kcf->events, 512); return NGX_CONF_OK; }