view src/event/ngx_event_connectex.c @ 485:4ebe09b07e30 release-0.1.17

nginx-0.1.17-RELEASE import *) Change: the ngx_http_rewrite_module was rewritten from the scratch. Now it is possible to redirect, to return the error codes, to check the variables and referrers. The directives can be used inside locations. The redirect directive was canceled. *) Feature: the ngx_http_geo_module. *) Feature: the proxy_set_x_var and fastcgi_set_var directives. *) Bugfix: the location configuration with "=" modifier may be used in another location. *) Bugfix: the correct content type was set only for requests that use small caps letters in extension. *) Bugfix: if the proxy_pass or fastcgi_pass directives were set in the location, and access was denied, and the error was redirected to a static page, then the segmentation fault occurred. *) Bugfix: if in a proxied "Location" header was a relative URL, then a host name and a slash were added to them; the bug had appeared in 0.1.14. *) Bugfix: the system error message was not logged on Linux.
author Igor Sysoev <igor@sysoev.ru>
date Thu, 03 Feb 2005 19:33:37 +0000
parents a88a3e4e158f
children d620f497c50f
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>


#define NGX_MAX_PENDING_CONN  10


static CRITICAL_SECTION  connect_lock;
static int               nconnects;
static ngx_connection_t  pending_connects[NGX_MAX_PENDING_CONN];

static HANDLE            pending_connect_event;

__declspec(thread) int                nevents = 0;
__declspec(thread) WSAEVENT           events[WSA_MAXIMUM_WAIT_EVENTS + 1];
__declspec(thread) ngx_connection_t  *conn[WSA_MAXIMUM_WAIT_EVENTS + 1];



int ngx_iocp_wait_connect(ngx_connection_t *c)
{
    for ( ;; ) {
        EnterCriticalSection(&connect_lock);

        if (nconnects < NGX_MAX_PENDING_CONN) {
            pending_connects[--nconnects] = c;
            LeaveCriticalSection(&connect_lock);

            if (SetEvent(pending_connect_event) == 0) {
                ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
                              "SetEvent() failed");
                return NGX_ERROR;

            break;
        }

        LeaveCriticalSection(&connect_lock);
        ngx_log_error(NGX_LOG_NOTICE, c->log, 0,
                      "max number of pending connect()s is %d",
                      NGX_MAX_PENDING_CONN);
        msleep(100);
    }

    if (!started) {
        if (ngx_iocp_new_thread(1) == NGX_ERROR) {
            return NGX_ERROR;
        }
        started = 1;
    }

    return NGX_OK;
}


int ngx_iocp_new_thread(int main)
{
    u_int  id;

    if (main) {
        pending_connect_event = CreateEvent(NULL, 0, 1, NULL);
        if (pending_connect_event == INVALID_HANDLE_VALUE) {
            ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
                          "CreateThread() failed");
            return NGX_ERROR;
        }
    }

    if (CreateThread(NULL, 0, ngx_iocp_wait_events, main, 0, &id)
                                                       == INVALID_HANDLE_VALUE)
    {
        ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
                      "CreateThread() failed");
        return NGX_ERROR;
    }

    SetEvent(event) {
        ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
                      "SetEvent() failed");
        return NGX_ERROR;
    }

    return NGX_OK;
}


int ngx_iocp_new_connect()
{
    EnterCriticalSection(&connect_lock);
    c = pending_connects[--nconnects];
    LeaveCriticalSection(&connect_lock);

    conn[nevents] = c;

    events[nevents] = WSACreateEvent();
    if (events[nevents] == INVALID_HANDLE_VALUE) {
        ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
                      "WSACreateEvent() failed");
        return NGX_ERROR;
    }

    if (WSAEventSelect(c->fd, events[nevents], FD_CONNECT) == -1)
        ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
                      "WSAEventSelect() failed");
        return NGX_ERROR;
    }

    nevents++;

    return NGX_OK;
}


void ngx_iocp_wait_events(int main)
{
    WSANETWORKEVENTS  ne;

    nevents = 1;
    events[0] = pending_connect_event;
    conn[0] = NULL;

    for ( ;; ) {
        offset = (nevents == WSA_MAXIMUM_WAIT_EVENTS + 1) ? 1: 0;
        timeout = (nevents == 1 && !first) ? 60000: INFINITE;

        n = WSAWaitForMultipleEvents(nevents - offset, events[offset],
                                     0, timeout, 0);
        if (n == WAIT_FAILED) {
            ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
                          "WSAWaitForMultipleEvents() failed");
            continue;
        }

        if (n == WAIT_TIMEOUT) {
            if (nevents == 2 && !main) {
                ExitThread(0);
            }

            ngx_log_error(NGX_LOG_ALERT, log, 0,
                          "WSAWaitForMultipleEvents() "
                          "returned unexpected WAIT_TIMEOUT");
            continue;
        }

        n -= WSA_WAIT_EVENT_0;

        if (events[n] == NULL) {

            /* the pending_connect_event */

            if (nevents == WSA_MAXIMUM_WAIT_EVENTS) {
                ngx_iocp_new_thread(0);
            } else {
                ngx_iocp_new_connect();
            }

            continue;
        }

        if (WSAEnumNetworkEvents(c[n].fd, events[n], &ne) == -1) {
            ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
                          "WSAEnumNetworkEvents() failed");
            continue;
        }

        if (ne.lNetworkEvents & FD_CONNECT) {
            conn[n].write->ovlp.error = ne.iErrorCode[FD_CONNECT_BIT];

            if (PostQueuedCompletionStatus(iocp, 0, NGX_IOCP_CONNECT,
                                           &conn[n].write->ovlp) == 0)
            {
                ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
                              "PostQueuedCompletionStatus() failed");
                continue;
            }

            if (n < nevents) {
                conn[n] = conn[nevents];
                events[n] = events[nevents];
            }

            nevents--;
            continue;
        }

        if (ne.lNetworkEvents & FD_ACCEPT) {

            /* CHECK ERROR ??? */

            ngx_event_post_acceptex(conn[n].listening, 1);
            continue;
        }

        ngx_log_error(NGX_LOG_ALERT, c[n].log, 0,
                      "WSAWaitForMultipleEvents() "
                      "returned unexpected network event %ul",
                      ne.lNetworkEvents);
    }
}