Mercurial > hg > nginx
annotate src/core/ngx_slab.h @ 6153:4f6efabcb09b
The "reuseport" option of the "listen" directive.
When configured, an individual listen socket on a given address is
created for each worker process. This allows to reduce in-kernel lock
contention on configurations with high accept rates, resulting in better
performance. As of now it works on Linux and DragonFly BSD.
Note that on Linux incoming connection requests are currently tied up
to a specific listen socket, and if some sockets are closed, connection
requests will be reset, see https://lwn.net/Articles/542629/. With
nginx, this may happen if the number of worker processes is reduced.
There is no such problem on DragonFly BSD.
Based on previous work by Sepherosa Ziehau and Yingqi Lu.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Wed, 20 May 2015 15:51:56 +0300 |
| parents | 25ade23cf281 |
| children | 99770a5ea14f |
| 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_SLAB_H_INCLUDED_ |
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9 #define _NGX_SLAB_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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16 typedef struct ngx_slab_page_s ngx_slab_page_t; |
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18 struct ngx_slab_page_s { |
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19 uintptr_t slab; |
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20 ngx_slab_page_t *next; |
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21 uintptr_t prev; |
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22 }; |
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25 typedef struct { |
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26 ngx_shmtx_sh_t lock; |
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28 size_t min_size; |
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29 size_t min_shift; |
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31 ngx_slab_page_t *pages; |
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32 ngx_slab_page_t *last; |
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33 ngx_slab_page_t free; |
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35 u_char *start; |
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36 u_char *end; |
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38 ngx_shmtx_t mutex; |
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40 u_char *log_ctx; |
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41 u_char zero; |
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43 unsigned log_nomem:1; |
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45 void *data; |
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46 void *addr; |
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47 } ngx_slab_pool_t; |
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50 void ngx_slab_init(ngx_slab_pool_t *pool); |
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51 void *ngx_slab_alloc(ngx_slab_pool_t *pool, size_t size); |
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52 void *ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size); |
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53 void *ngx_slab_calloc(ngx_slab_pool_t *pool, size_t size); |
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54 void *ngx_slab_calloc_locked(ngx_slab_pool_t *pool, size_t size); |
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55 void ngx_slab_free(ngx_slab_pool_t *pool, void *p); |
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56 void ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p); |
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59 #endif /* _NGX_SLAB_H_INCLUDED_ */ |