Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_aio_read_chain.c @ 5905:2f7e557eab5b
Cache: proxy_cache_lock_age and friends.
Once this age is reached, the cache lock is discarded and another
request can acquire the lock. Requests which failed to acquire
the lock are not allowed to cache the response.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Tue, 18 Nov 2014 20:41:12 +0300 |
parents | ec81934727a1 |
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441
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_event.h> |
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11 |
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12 |
577 | 13 ssize_t |
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14 ngx_aio_read_chain(ngx_connection_t *c, ngx_chain_t *cl, off_t limit) |
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15 { |
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16 int n; |
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17 u_char *buf, *prev; |
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18 size_t size; |
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19 ssize_t total; |
164
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20 |
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21 if (c->read->pending_eof) { |
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22 c->read->ready = 0; |
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23 return 0; |
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24 } |
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25 |
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26 total = 0; |
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27 |
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28 while (cl) { |
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29 |
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30 /* we can post the single aio operation only */ |
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31 |
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32 if (!c->read->ready) { |
164
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33 return total ? total : NGX_AGAIN; |
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34 } |
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35 |
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36 buf = cl->buf->last; |
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37 prev = cl->buf->last; |
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38 size = 0; |
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39 |
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40 /* coalesce the neighbouring bufs */ |
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41 |
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42 while (cl && prev == cl->buf->last) { |
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43 size += cl->buf->end - cl->buf->last; |
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44 prev = cl->buf->end; |
164
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45 cl = cl->next; |
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46 } |
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47 |
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48 n = ngx_aio_read(c, buf, size); |
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49 |
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50 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n); |
164
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51 |
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52 if (n == NGX_AGAIN) { |
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53 return total ? total : NGX_AGAIN; |
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54 } |
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55 |
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56 if (n == NGX_ERROR) { |
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57 return NGX_ERROR; |
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58 } |
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59 |
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60 if (n == 0) { |
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61 c->read->pending_eof = 1; |
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62 if (total) { |
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63 c->read->eof = 0; |
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64 c->read->ready = 1; |
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65 } |
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66 return total; |
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67 } |
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68 |
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69 if (n > 0) { |
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70 total += n; |
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71 } |
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72 |
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73 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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74 "aio_read total: %d", total); |
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75 } |
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76 |
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77 return total ? total : NGX_AGAIN; |
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78 } |