Mercurial > hg > nginx-quic
annotate src/os/win32/ngx_shmem.h @ 7583:efd71d49bde0
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> |
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date | Thu, 17 Oct 2019 16:02:19 +0300 |
parents | af7eba90645d |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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696 | 8 #ifndef _NGX_SHMEM_H_INCLUDED_ |
9 #define _NGX_SHMEM_H_INCLUDED_ | |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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605 | 16 typedef struct { |
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17 u_char *addr; |
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18 size_t size; |
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19 ngx_str_t name; |
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20 HANDLE handle; |
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21 ngx_log_t *log; |
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22 ngx_uint_t exists; /* unsigned exists:1; */ |
605 | 23 } ngx_shm_t; |
24 | |
25 | |
26 ngx_int_t ngx_shm_alloc(ngx_shm_t *shm); | |
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27 ngx_int_t ngx_shm_remap(ngx_shm_t *shm, u_char *addr); |
605 | 28 void ngx_shm_free(ngx_shm_t *shm); |
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30 extern ngx_uint_t ngx_allocation_granularity; |
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696 | 33 #endif /* _NGX_SHMEM_H_INCLUDED_ */ |