Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_aio_read_chain.c @ 359:a3e622ab7ee7
nginx-0.0.7-2004-06-18-10:09:25 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 18 Jun 2004 06:09:25 +0000 |
parents | 6bdf858bff8c |
children | 744ccb59062d |
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; |
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13 ssize_t total; |
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14 ngx_err_t err; |
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16 if (c->read->aio_eof) { |
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17 c->read->ready = 0; |
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18 return 0; |
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19 } |
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20 |
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21 total = 0; |
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22 |
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23 while (cl) { |
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24 |
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25 /* we can post the single aio operation only */ |
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26 |
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27 if (!c->read->ready) { |
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28 return total ? total : NGX_AGAIN; |
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29 } |
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30 |
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31 buf = cl->buf->last; |
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32 prev = cl->buf->last; |
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33 size = 0; |
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34 |
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35 /* coalesce the neighbouring bufs */ |
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36 |
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37 while (cl && prev == cl->buf->last) { |
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38 size += cl->buf->end - cl->buf->last; |
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39 prev = cl->buf->end; |
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40 cl = cl->next; |
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41 } |
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42 |
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43 n = ngx_aio_read(c, buf, size); |
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44 |
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45 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n); |
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46 |
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47 if (n == NGX_AGAIN) { |
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48 return total ? total : NGX_AGAIN; |
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49 } |
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50 |
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51 if (n == NGX_ERROR) { |
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52 return NGX_ERROR; |
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53 } |
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54 |
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55 if (n == 0) { |
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56 c->read->aio_eof = 1; |
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57 if (total) { |
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58 c->read->eof = 0; |
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59 c->read->ready = 1; |
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60 } |
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61 return total; |
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62 } |
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63 |
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64 if (n > 0) { |
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65 total += n; |
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66 } |
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67 |
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68 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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69 "aio_read total: %d", total); |
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70 } |
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71 |
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72 return total ? total : NGX_AGAIN; |
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73 } |