Mercurial > hg > nginx
annotate src/os/unix/ngx_aio_read_chain.c @ 3513:e60e00b4fe0c
ngx_http_split_clients_module
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 14 May 2010 09:02:10 +0000 |
parents | a1d54c705f38 |
children | d620f497c50f |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_event.h> |
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10 |
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11 |
577 | 12 ssize_t |
13 ngx_aio_read_chain(ngx_connection_t *c, ngx_chain_t *cl) | |
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14 { |
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15 int n; |
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16 u_char *buf, *prev; |
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17 size_t size; |
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18 ssize_t total; |
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19 |
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20 if (c->read->pending_eof) { |
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21 c->read->ready = 0; |
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22 return 0; |
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23 } |
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24 |
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25 total = 0; |
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26 |
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27 while (cl) { |
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28 |
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29 /* we can post the single aio operation only */ |
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30 |
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31 if (!c->read->ready) { |
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32 return total ? total : NGX_AGAIN; |
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33 } |
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34 |
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35 buf = cl->buf->last; |
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36 prev = cl->buf->last; |
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37 size = 0; |
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38 |
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39 /* coalesce the neighbouring bufs */ |
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40 |
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41 while (cl && prev == cl->buf->last) { |
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42 size += cl->buf->end - cl->buf->last; |
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43 prev = cl->buf->end; |
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44 cl = cl->next; |
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45 } |
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46 |
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47 n = ngx_aio_read(c, buf, size); |
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48 |
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49 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n); |
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50 |
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51 if (n == NGX_AGAIN) { |
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52 return total ? total : NGX_AGAIN; |
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53 } |
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54 |
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55 if (n == NGX_ERROR) { |
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56 return NGX_ERROR; |
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57 } |
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58 |
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59 if (n == 0) { |
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60 c->read->pending_eof = 1; |
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61 if (total) { |
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62 c->read->eof = 0; |
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63 c->read->ready = 1; |
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64 } |
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65 return total; |
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66 } |
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67 |
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68 if (n > 0) { |
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69 total += n; |
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70 } |
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71 |
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72 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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73 "aio_read total: %d", total); |
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74 } |
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75 |
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76 return total ? total : NGX_AGAIN; |
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77 } |