Mercurial > hg > nginx-quic
view src/event/modules/ngx_devpoll_module.c @ 62:8ccba41a678e
nginx-0.0.1-2003-02-12-09:55:42 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 12 Feb 2003 06:55:42 +0000 |
parents | e8cdc2989cee |
children | e43f406e4525 |
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/* * Copyright (C) 2002 Igor Sysoev, http://sysoev.ru */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_types.h> #include <ngx_log.h> #include <ngx_connection.h> #include <ngx_event.h> #include <ngx_event_timer.h> #include <ngx_devpoll_module.h> #if (USE_DEVPOLL) && !(HAVE_DEVPOLL) #error "/dev/poll is not supported on this platform" #endif static int ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags); /* STUB */ #define DEVPOLL_NCHANGES 512 #define DEVPOLL_NEVENTS 512 /* should be per-thread */ static int dp; static struct pollfd *change_list, *event_list; static unsigned int nchanges; static int nevents; static ngx_event_t **change_index; static ngx_event_t *timer_queue; /* */ int ngx_devpoll_init(int max_connections, ngx_log_t *log) { int change_size, event_size; nevents = DEVPOLL_NEVENTS; nchanges = 0; change_size = sizeof(struct pollfd) * DEVPOLL_NCHANGES; event_size = sizeof(struct pollfd) * DEVPOLL_NEVENTS; dp = open("/dev/poll", O_RDWR); if (dp == -1) { ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "open(/dev/poll) failed"); return NGX_ERROR; } ngx_test_null(change_list, ngx_alloc(change_size, log), NGX_ERROR); ngx_test_null(event_list, ngx_alloc(event_size, log), NGX_ERROR); ngx_test_null(change_index, ngx_alloc(sizeof(ngx_event_t *) * DEVPOLL_NCHANGES, log), NGX_ERROR); timer_queue = ngx_event_init_timer(log); if (timer_queue == NULL) { return NGX_ERROR; } #if !(USE_DEVPOLL) ngx_event_actions.add = ngx_devpoll_add_event; ngx_event_actions.del = ngx_devpoll_del_event; ngx_event_actions.timer = ngx_event_add_timer; ngx_event_actions.process = ngx_devpoll_process_events; #endif return NGX_OK; } int ngx_devpoll_add_event(ngx_event_t *ev, int event, u_int flags) { #if (NGX_DEBUG_EVENT) ngx_connection_t *c = (ngx_connection_t *) ev->data; #endif #if (NGX_READ_EVENT != POLLIN) if (event == NGX_READ_EVENT) { event = POLLOUT; #if (NGX_WRITE_EVENT != POLLOUT) } else { event = POLLIN; #endif } #endif #if (NGX_DEBUG_EVENT) c = (ngx_connection_t *) ev->data; ngx_log_debug(ev->log, "add event: %d:%d" _ c->fd _ event); #endif ev->active = 1; ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1: 0; return ngx_devpoll_set_event(ev, event, 0); } int ngx_devpoll_del_event(ngx_event_t *ev, int event, u_int flags) { ngx_event_t *e; #if (NGX_DEBUG_EVENT) ngx_connection_t *c = (ngx_connection_t *) ev->data; ngx_log_debug(c->log, "del event: %d, %d" _ c->fd _ event); #endif if (ngx_devpoll_set_event(ev, POLLREMOVE, flags) == NGX_ERROR) { return NGX_ERROR; } ev->active = 0; if (flags & NGX_CLOSE_EVENT) { return NGX_OK; } /* we need to restore second event if it exists */ if (event == NGX_READ_EVENT) { e = c->write; event = POLLOUT; } else { e = c->read; event = POLLIN; } if (e) { return ngx_devpoll_set_event(e, event, 0); } return NGX_OK; } static int ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags) { int n; ngx_connection_t *c; c = (ngx_connection_t *) ev->data; #if (NGX_DEBUG_EVENT) ngx_log_debug(ev->log, "devpoll fd:%d event:%d flush:%d" _ c->fd _ event _ flags); #endif if (nchanges >= DEVPOLL_NCHANGES) { ngx_log_error(NGX_LOG_WARN, ev->log, 0, "/dev/pool change list is filled up"); n = nchanges * sizeof(struct pollfd); if (write(dp, change_list, n) != n) { ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "write(/dev/poll) failed"); return NGX_ERROR; } nchanges = 0; } change_list[nchanges].fd = c->fd; change_list[nchanges].events = event; change_list[nchanges].revents = 0; change_index[nchanges] = ev; ev->index = nchanges; nchanges++; if (flags & NGX_CLOSE_EVENT) { n = nchanges * sizeof(struct pollfd); if (write(dp, change_list, n) != n) { ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "write(/dev/poll) failed"); return NGX_ERROR; } nchanges = 0; } return NGX_OK; } int ngx_devpoll_process_events(ngx_log_t *log) { int events, n, i; ngx_msec_t timer, delta; ngx_err_t err; ngx_connection_t *c; struct dvpoll dvp; struct timeval tv; timer = ngx_event_find_timer(); if (timer) { gettimeofday(&tv, NULL); delta = tv.tv_sec * 1000 + tv.tv_usec / 1000; } else { timer = INFTIM; delta = 0; } #if (NGX_DEBUG_EVENT) ngx_log_debug(log, "devpoll timer: %d" _ timer); #endif if (nchanges) { n = nchanges * sizeof(struct pollfd); if (write(dp, change_list, n) != n) { ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "write(/dev/poll) failed"); return NGX_ERROR; } } dvp.dp_fds = event_list; dvp.dp_nfds = nevents; dvp.dp_timeout = timer; events = ioctl(dp, DP_POLL, &dvp); if (events == -1) { ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "ioctl(DP_POLL) failed"); return NGX_ERROR; } nchanges = 0; if ((int) timer != INFTIM) { gettimeofday(&tv, NULL); delta = tv.tv_sec * 1000 + tv.tv_usec / 1000 - delta; } else { if (events == 0) { ngx_log_error(NGX_LOG_ALERT, log, 0, "ioctl(DP_POLL) returns no events without timeout"); return NGX_ERROR; } } #if (NGX_DEBUG_EVENT) ngx_log_debug(log, "devpoll timer: %d, delta: %d" _ timer _ delta); #endif for (i = 0; i < events; i++) { #if (NGX_DEBUG_EVENT) ngx_log_debug(log, "devpoll: %d: ev:%d rev:%d" _ event_list[i].fd _ event_list[i].events _ event_list[i].revents); #endif c = &ngx_connections[event_list[i].fd]; if (event_list[i].revents & POLLIN) { if (!c->read->active) { continue; } c->read->ready = 1; if (c->read->oneshot) { ngx_del_timer(c->read); ngx_devpoll_del_event(c->read, NGX_READ_EVENT, 0); } if (c->read->event_handler(c->read) == NGX_ERROR) { c->read->close_handler(c->read); } } if (event_list[i].revents & POLLOUT) { if (!c->write->active) { continue; } c->write->ready = 1; if (c->write->oneshot) { ngx_del_timer(c->write); ngx_devpoll_del_event(c->write, NGX_WRITE_EVENT, 0); } if (c->write->event_handler(c->write) == NGX_ERROR) { c->write->close_handler(c->write); } } if (event_list[i].revents & (POLLERR|POLLHUP|POLLNVAL)) { err = 0; if (event_list[i].revents & POLLNVAL) { err = EBADF; } ngx_log_error(NGX_LOG_ERR, log, err, "ioctl(DP_POLL) error on %d:%d", event_list[i].fd, event_list[i].revents); } } if ((int) timer != INFTIM) { ngx_event_expire_timers(delta); } return NGX_OK; }