Mercurial > hg > nginx
annotate src/os/unix/ngx_socket.h @ 7985:ec2e6893caaa
Simplified sendfile(SF_NODISKIO) usage.
Starting with FreeBSD 11, there is no need to use AIO operations to preload
data into cache for sendfile(SF_NODISKIO) to work. Instead, sendfile()
handles non-blocking loading data from disk by itself. It still can, however,
return EBUSY if a page is already being loaded (for example, by a different
process). If this happens, we now post an event for the next event loop
iteration, so sendfile() is retried "after a short period", as manpage
recommends.
The limit of the number of EBUSY tolerated without any progress is preserved,
but now it does not result in an alert, since on an idle system event loop
iteration might be very short and EBUSY can happen many times in a row.
Instead, SF_NODISKIO is simply disabled for one call once the limit is
reached.
With this change, sendfile(SF_NODISKIO) is now used automatically as long as
sendfile() is enabled, and no longer requires "aio on;".
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 27 Dec 2021 19:48:33 +0300 |
parents | efd71d49bde0 |
children | 23880e4ad3e2 |
rev | line source |
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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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8 #ifndef _NGX_SOCKET_H_INCLUDED_ |
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9 #define _NGX_SOCKET_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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15 #define NGX_WRITE_SHUTDOWN SHUT_WR |
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17 typedef int ngx_socket_t; |
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461 | 19 #define ngx_socket socket |
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20 #define ngx_socket_n "socket()" |
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469 | 23 #if (NGX_HAVE_FIONBIO) |
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25 int ngx_nonblocking(ngx_socket_t s); |
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26 int ngx_blocking(ngx_socket_t s); |
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28 #define ngx_nonblocking_n "ioctl(FIONBIO)" |
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29 #define ngx_blocking_n "ioctl(!FIONBIO)" |
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31 #else |
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645 | 33 #define ngx_nonblocking(s) fcntl(s, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK) |
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34 #define ngx_nonblocking_n "fcntl(O_NONBLOCK)" |
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645 | 36 #define ngx_blocking(s) fcntl(s, F_SETFL, fcntl(s, F_GETFL) & ~O_NONBLOCK) |
37 #define ngx_blocking_n "fcntl(!O_NONBLOCK)" | |
38 | |
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39 #endif |
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Events: available bytes calculation via ioctl(FIONREAD).
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41 #if (NGX_HAVE_FIONREAD) |
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43 #define ngx_socket_nread(s, n) ioctl(s, FIONREAD, n) |
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44 #define ngx_socket_nread_n "ioctl(FIONREAD)" |
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46 #endif |
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48 int ngx_tcp_nopush(ngx_socket_t s); |
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49 int ngx_tcp_push(ngx_socket_t s); |
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455 | 51 #if (NGX_LINUX) |
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53 #define ngx_tcp_nopush_n "setsockopt(TCP_CORK)" |
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54 #define ngx_tcp_push_n "setsockopt(!TCP_CORK)" |
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56 #else |
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58 #define ngx_tcp_nopush_n "setsockopt(TCP_NOPUSH)" |
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59 #define ngx_tcp_push_n "setsockopt(!TCP_NOPUSH)" |
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61 #endif |
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64 #define ngx_shutdown_socket shutdown |
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65 #define ngx_shutdown_socket_n "shutdown()" |
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67 #define ngx_close_socket close |
465 | 68 #define ngx_close_socket_n "close() socket" |
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71 #endif /* _NGX_SOCKET_H_INCLUDED_ */ |