Mercurial > hg > nginx
annotate src/os/unix/ngx_aio_read_chain.c @ 298:4a3f18406832
nginx-0.0.3-2004-03-30-10:27:36 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 30 Mar 2004 06:27:36 +0000 |
parents | 70e1c7d2b83d |
children | 7a8ebba985a9 |
rev | line source |
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1 |
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2 #include <ngx_config.h> |
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3 #include <ngx_core.h> |
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4 #include <ngx_event.h> |
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5 #include <ngx_aio.h> |
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6 |
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7 |
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8 ssize_t ngx_aio_read_chain(ngx_connection_t *c, ngx_chain_t *cl) |
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9 { |
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10 int n; |
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11 u_char *buf, *prev; |
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12 size_t size, total; |
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13 ngx_err_t err; |
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15 if (c->read->aio_eof) { |
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16 c->read->ready = 0; |
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17 return 0; |
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18 } |
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20 total = 0; |
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21 |
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22 while (cl) { |
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23 |
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24 /* we can post the single aio operation only */ |
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26 if (!c->read->ready) { |
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27 return total ? total : NGX_AGAIN; |
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28 } |
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30 buf = cl->hunk->last; |
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31 prev = cl->hunk->last; |
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32 size = 0; |
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33 |
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34 /* coalesce the neighbouring hunks */ |
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35 |
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36 while (cl && prev == cl->hunk->last) { |
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37 size += cl->hunk->end - cl->hunk->last; |
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38 prev = cl->hunk->end; |
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39 cl = cl->next; |
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40 } |
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41 |
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42 n = ngx_aio_read(c, buf, size); |
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44 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n); |
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45 |
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46 if (n == NGX_AGAIN) { |
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47 return total ? total : NGX_AGAIN; |
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48 } |
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49 |
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50 if (n == NGX_ERROR) { |
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51 return NGX_ERROR; |
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52 } |
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53 |
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54 if (n == 0) { |
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55 c->read->aio_eof = 1; |
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56 if (total) { |
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57 c->read->eof = 0; |
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58 c->read->ready = 1; |
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59 } |
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60 return total; |
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61 } |
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62 |
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63 if (n > 0) { |
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64 total += n; |
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65 } |
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66 |
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67 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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68 "aio_read total: %d", total); |
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69 } |
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70 |
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71 return total ? total : NGX_AGAIN; |
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72 } |