Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_aio_write_chain.c @ 413:de9d4726e28a
nginx-0.0.10-2004-08-31-23:05:39 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 31 Aug 2004 19:05:39 +0000 |
parents | 7650aea1816f |
children | da8c5707af39 |
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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8 ngx_chain_t *ngx_aio_write_chain(ngx_connection_t *c, ngx_chain_t *in, |
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9 off_t limit) |
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10 { |
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11 int n; |
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12 u_char *buf, *prev; |
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13 off_t send, sent; |
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14 size_t len; |
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15 ssize_t size; |
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16 ngx_err_t err; |
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17 ngx_chain_t *cl; |
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18 |
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19 send = 0; |
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20 sent = 0; |
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21 cl = in; |
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22 |
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23 while (cl) { |
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24 |
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25 if (cl->buf->pos == cl->buf->last) { |
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26 cl = cl->next; |
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27 continue; |
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28 } |
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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->write->ready) { |
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33 return cl; |
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34 } |
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35 |
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36 buf = cl->buf->pos; |
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37 prev = buf; |
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38 len = 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->pos && send < limit) { |
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43 if (ngx_buf_special(cl->buf)) { |
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44 continue; |
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45 } |
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46 |
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47 size = cl->buf->last - cl->buf->pos; |
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48 |
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49 if (send + size > limit) { |
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50 size = limit - send; |
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51 } |
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52 |
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53 len += size; |
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54 prev = cl->buf->pos + size; |
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55 send += size; |
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56 cl = cl->next; |
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57 } |
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58 |
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59 n = ngx_aio_write(c, buf, len); |
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60 |
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61 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_write: %d", n); |
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62 |
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63 if (n == NGX_ERROR) { |
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64 return NGX_CHAIN_ERROR; |
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65 } |
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66 |
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67 if (n > 0) { |
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68 sent += n; |
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69 c->sent += n; |
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70 } |
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72 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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73 "aio_write sent: " OFF_T_FMT, c->sent); |
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74 |
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75 for (cl = in; cl; cl = cl->next) { |
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76 |
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77 if (sent >= cl->buf->last - cl->buf->pos) { |
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78 sent -= cl->buf->last - cl->buf->pos; |
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79 cl->buf->pos = cl->buf->last; |
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80 |
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81 continue; |
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82 } |
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83 |
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84 cl->buf->pos += sent; |
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85 |
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86 break; |
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87 } |
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88 } |
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89 |
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90 return cl; |
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91 } |