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Events: available bytes calculation via ioctl(FIONREAD). This makes it possible to avoid looping for a long time while working with a fast enough peer when data are added to the socket buffer faster than we are able to read and process them (ticket #1431). This is basically what we already do on FreeBSD with kqueue, where information about the number of bytes in the socket buffer is returned by the kevent() call. With other event methods rev->available is now set to -1 when the socket is ready for reading. Later in ngx_recv() and ngx_recv_chain(), if full buffer is received, real number of bytes in the socket buffer is retrieved using ioctl(FIONREAD). Reading more than this number of bytes ensures that even with edge-triggered event methods the event will be triggered again, so it is safe to stop processing of the socket and switch to other connections. Using ioctl(FIONREAD) only after reading a full buffer is an optimization. With this approach we only call ioctl(FIONREAD) when there are at least two recv()/readv() calls.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 17 Oct 2019 16:02:19 +0300
parents f7e79596baf2
children
line wrap: on
line source


# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


    ngx_feature="libxslt"
    ngx_feature_name=
    ngx_feature_run=no
    ngx_feature_incs="#include <libxml/parser.h>
                      #include <libxml/tree.h>
                      #include <libxslt/xslt.h>
                      #include <libxslt/xsltInternals.h>
                      #include <libxslt/transform.h>
                      #include <libxslt/xsltutils.h>"
    ngx_feature_path="/usr/include/libxml2"
    ngx_feature_libs="-lxml2 -lxslt"
    ngx_feature_test="xmlParserCtxtPtr    ctxt = NULL;
                      xsltStylesheetPtr   sheet = NULL;
                      xmlDocPtr           doc = NULL;
                      xmlParseChunk(ctxt, NULL, 0, 0);
                      xsltApplyStylesheet(sheet, doc, NULL);"
    . auto/feature


if [ $ngx_found = no ]; then

    # FreeBSD port

    ngx_feature="libxslt in /usr/local/"
    ngx_feature_path="/usr/local/include/libxml2 /usr/local/include"

    if [ $NGX_RPATH = YES ]; then
        ngx_feature_libs="-R/usr/local/lib -L/usr/local/lib -lxml2 -lxslt"
    else
        ngx_feature_libs="-L/usr/local/lib -lxml2 -lxslt"
    fi

    . auto/feature
fi


if [ $ngx_found = no ]; then

    # NetBSD port

    ngx_feature="libxslt in /usr/pkg/"
    ngx_feature_path="/usr/pkg/include/libxml2 /usr/pkg/include"

    if [ $NGX_RPATH = YES ]; then
        ngx_feature_libs="-R/usr/pkg/lib -L/usr/pkg/lib -lxml2 -lxslt"
    else
        ngx_feature_libs="-L/usr/pkg/lib -lxml2 -lxslt"
    fi

    . auto/feature
fi


if [ $ngx_found = no ]; then

    # MacPorts

    ngx_feature="libxslt in /opt/local/"
    ngx_feature_path="/opt/local/include/libxml2 /opt/local/include"

    if [ $NGX_RPATH = YES ]; then
        ngx_feature_libs="-R/opt/local/lib -L/opt/local/lib -lxml2 -lxslt"
    else
        ngx_feature_libs="-L/opt/local/lib -lxml2 -lxslt"
    fi

    . auto/feature
fi


if [ $ngx_found = yes ]; then

    CORE_INCS="$CORE_INCS $ngx_feature_path"

    if [ $USE_LIBXSLT = YES ]; then
        CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
    fi

    NGX_LIB_LIBXSLT=$ngx_feature_libs

else

cat << END

$0: error: the HTTP XSLT module requires the libxml2/libxslt
libraries. You can either do not enable the module or install the libraries.

END

    exit 1
fi


    ngx_feature="libexslt"
    ngx_feature_name=NGX_HAVE_EXSLT
    ngx_feature_run=no
    ngx_feature_incs="#include <libexslt/exslt.h>"
    ngx_feature_path="/usr/include/libxml2"
    ngx_feature_libs="-lexslt"
    ngx_feature_test="exsltRegisterAll();"
    . auto/feature

if [ $ngx_found = no ]; then

    # FreeBSD port

    ngx_feature="libexslt in /usr/local/"
    ngx_feature_path="/usr/local/include/libxml2 /usr/local/include"

    if [ $NGX_RPATH = YES ]; then
        ngx_feature_libs="-R/usr/local/lib -L/usr/local/lib -lexslt"
    else
        ngx_feature_libs="-L/usr/local/lib -lexslt"
    fi

    . auto/feature
fi


if [ $ngx_found = no ]; then

    # NetBSD port

    ngx_feature="libexslt in /usr/pkg/"
    ngx_feature_path="/usr/pkg/include/libxml2 /usr/local/include"

    if [ $NGX_RPATH = YES ]; then
        ngx_feature_libs="-R/usr/pkg/lib -L/usr/pkg/lib -lexslt"
    else
        ngx_feature_libs="-L/usr/pkg/lib -lexslt"
    fi

    . auto/feature
fi


if [ $ngx_found = no ]; then

    # MacPorts

    ngx_feature="libexslt in /opt/local/"
    ngx_feature_path="/opt/local/include/libxml2 /opt/local/include"

    if [ $NGX_RPATH = YES ]; then
        ngx_feature_libs="-R/opt/local/lib -L/opt/local/lib -lexslt"
    else
        ngx_feature_libs="-L/opt/local/lib -lexslt"
    fi

    . auto/feature
fi


if [ $ngx_found = yes ]; then
    if [ $USE_LIBXSLT = YES ]; then
        CORE_LIBS="$CORE_LIBS -lexslt"
    fi

    NGX_LIB_LIBXSLT="$NGX_LIB_LIBXSLT -lexslt"
fi