view auto/cc/name @ 7969:84c60a3cd12a stable-1.20

Changed ngx_chain_update_chains() to test tag first (ticket #2248). Without this change, aio used with HTTP/2 can result in connection hang, as observed with "aio threads; aio_write on;" and proxying (ticket #2248). The problem is that HTTP/2 updates buffers outside of the output filters (notably, marks them as sent), and then posts a write event to call output filters. If a filter does not call the next one for some reason (for example, because of an AIO operation in progress), this might result in a state when the owner of a buffer already called ngx_chain_update_chains() and can reuse the buffer, while the same buffer is still sitting in the busy chain of some other filter. In the particular case a buffer was sitting in output chain's ctx->busy, and was reused by event pipe. Output chain's ctx->busy was permanently blocked by it, and this resulted in connection hang. Fix is to change ngx_chain_update_chains() to skip buffers from other modules unconditionally, without trying to wait for these buffers to become empty.
author Maxim Dounin <mdounin@mdounin.ru>
date Sat, 30 Oct 2021 02:39:19 +0300
parents 325b3042edd6
children
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


if [ "$NGX_PLATFORM" != win32 ]; then

    ngx_feature="C compiler"
    ngx_feature_name=
    ngx_feature_run=yes
    ngx_feature_incs=
    ngx_feature_path=
    ngx_feature_libs=
    ngx_feature_test=
    . auto/feature

    if [ $ngx_found = no ]; then
        echo
        echo $0: error: C compiler $CC is not found
        echo
        exit 1
    fi

fi


if [ "$CC" = cl ]; then
    NGX_CC_NAME=msvc
    echo " + using Microsoft Visual C++ compiler"

elif [ "$CC" = wcl386 ]; then
    NGX_CC_NAME=owc
    echo " + using Open Watcom C compiler"

elif [ "$CC" = bcc32 ]; then
    NGX_CC_NAME=bcc
    echo " + using Borland C++ compiler"

elif `$CC -V 2>&1 | grep '^Intel(R) C' >/dev/null 2>&1`; then
    NGX_CC_NAME=icc
    echo " + using Intel C++ compiler"

elif `$CC -v 2>&1 | grep 'gcc version' >/dev/null 2>&1`; then
    NGX_CC_NAME=gcc
    echo " + using GNU C compiler"

elif `$CC -v 2>&1 | grep 'clang version' >/dev/null 2>&1`; then
    NGX_CC_NAME=clang
    echo " + using Clang C compiler"

elif `$CC -v 2>&1 | grep 'LLVM version' >/dev/null 2>&1`; then
    NGX_CC_NAME=clang
    echo " + using Clang C compiler"

elif `$CC -V 2>&1 | grep 'Sun C' >/dev/null 2>&1`; then
    NGX_CC_NAME=sunc
    echo " + using Sun C compiler"

elif `$CC -V 2>&1 | grep '^Compaq C' >/dev/null 2>&1`; then
    NGX_CC_NAME=ccc
    echo " + using Compaq C compiler"

elif `$CC -V 2>&1 | grep '^aCC: ' >/dev/null 2>&1`; then
    NGX_CC_NAME=acc
    echo " + using HP aC++ compiler"

else
    NGX_CC_NAME=unknown

fi