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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 400711951595
children
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charset_map  koi8-r  windows-1251 {

    80  88 ; # euro

    95  95 ; # bullet

    9A  A0 ; # &nbsp;

    9E  B7 ; # &middot;

    A3  B8 ; # small yo
    A4  BA ; # small Ukrainian ye

    A6  B3 ; # small Ukrainian i
    A7  BF ; # small Ukrainian yi

    AD  B4 ; # small Ukrainian soft g
    AE  A2 ; # small Byelorussian short u

    B0  B0 ; # &deg;

    B3  A8 ; # capital YO
    B4  AA ; # capital Ukrainian YE

    B6  B2 ; # capital Ukrainian I
    B7  AF ; # capital Ukrainian YI

    B9  B9 ; # numero sign

    BD  A5 ; # capital Ukrainian soft G
    BE  A1 ; # capital Byelorussian short U

    BF  A9 ; # (C)

    C0  FE ; # small yu
    C1  E0 ; # small a
    C2  E1 ; # small b
    C3  F6 ; # small ts
    C4  E4 ; # small d
    C5  E5 ; # small ye
    C6  F4 ; # small f
    C7  E3 ; # small g
    C8  F5 ; # small kh
    C9  E8 ; # small i
    CA  E9 ; # small j
    CB  EA ; # small k
    CC  EB ; # small l
    CD  EC ; # small m
    CE  ED ; # small n
    CF  EE ; # small o

    D0  EF ; # small p
    D1  FF ; # small ya
    D2  F0 ; # small r
    D3  F1 ; # small s
    D4  F2 ; # small t
    D5  F3 ; # small u
    D6  E6 ; # small zh
    D7  E2 ; # small v
    D8  FC ; # small soft sign
    D9  FB ; # small y
    DA  E7 ; # small z
    DB  F8 ; # small sh
    DC  FD ; # small e
    DD  F9 ; # small shch
    DE  F7 ; # small ch
    DF  FA ; # small hard sign

    E0  DE ; # capital YU
    E1  C0 ; # capital A
    E2  C1 ; # capital B
    E3  D6 ; # capital TS
    E4  C4 ; # capital D
    E5  C5 ; # capital YE
    E6  D4 ; # capital F
    E7  C3 ; # capital G
    E8  D5 ; # capital KH
    E9  C8 ; # capital I
    EA  C9 ; # capital J
    EB  CA ; # capital K
    EC  CB ; # capital L
    ED  CC ; # capital M
    EE  CD ; # capital N
    EF  CE ; # capital O

    F0  CF ; # capital P
    F1  DF ; # capital YA
    F2  D0 ; # capital R
    F3  D1 ; # capital S
    F4  D2 ; # capital T
    F5  D3 ; # capital U
    F6  C6 ; # capital ZH
    F7  C2 ; # capital V
    F8  DC ; # capital soft sign
    F9  DB ; # capital Y
    FA  C7 ; # capital Z
    FB  D8 ; # capital SH
    FC  DD ; # capital E
    FD  D9 ; # capital SHCH
    FE  D7 ; # capital CH
    FF  DA ; # capital hard sign
}