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view src/os/unix/ngx_linux_config.h @ 7583:efd71d49bde0

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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 56923e8e01a5
children c0a432c0301b
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_LINUX_CONFIG_H_INCLUDED_
#define _NGX_LINUX_CONFIG_H_INCLUDED_


#ifndef _GNU_SOURCE
#define _GNU_SOURCE             /* pread(), pwrite(), gethostname() */
#endif

#define _FILE_OFFSET_BITS  64

#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdarg.h>
#include <stddef.h>             /* offsetof() */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <pwd.h>
#include <grp.h>
#include <dirent.h>
#include <glob.h>
#include <sys/vfs.h>            /* statfs() */

#include <sys/uio.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sched.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>        /* TCP_NODELAY, TCP_CORK */
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/un.h>

#include <time.h>               /* tzset() */
#include <malloc.h>             /* memalign() */
#include <limits.h>             /* IOV_MAX */
#include <sys/ioctl.h>
#include <crypt.h>
#include <sys/utsname.h>        /* uname() */

#include <dlfcn.h>


#include <ngx_auto_config.h>


#if (NGX_HAVE_POSIX_SEM)
#include <semaphore.h>
#endif


#if (NGX_HAVE_SYS_PRCTL_H)
#include <sys/prctl.h>
#endif


#if (NGX_HAVE_SENDFILE64)
#include <sys/sendfile.h>
#else
extern ssize_t sendfile(int s, int fd, int32_t *offset, size_t size);
#define NGX_SENDFILE_LIMIT  0x80000000
#endif


#if (NGX_HAVE_POLL)
#include <poll.h>
#endif


#if (NGX_HAVE_EPOLL)
#include <sys/epoll.h>
#endif


#if (NGX_HAVE_SYS_EVENTFD_H)
#include <sys/eventfd.h>
#endif
#include <sys/syscall.h>
#if (NGX_HAVE_FILE_AIO)
#include <linux/aio_abi.h>
typedef struct iocb  ngx_aiocb_t;
#endif


#if (NGX_HAVE_CAPABILITIES)
#include <linux/capability.h>
#endif


#define NGX_LISTEN_BACKLOG        511


#ifndef NGX_HAVE_SO_SNDLOWAT
/* setsockopt(SO_SNDLOWAT) returns ENOPROTOOPT */
#define NGX_HAVE_SO_SNDLOWAT         0
#endif


#ifndef NGX_HAVE_INHERITED_NONBLOCK
#define NGX_HAVE_INHERITED_NONBLOCK  0
#endif


#define NGX_HAVE_OS_SPECIFIC_INIT    1
#define ngx_debug_init()


extern char **environ;


#endif /* _NGX_LINUX_CONFIG_H_INCLUDED_ */