Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_aio_write_chain.c @ 448:241dc8092a33
nginx-0.1.0-2004-10-01-19:53:53 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 01 Oct 2004 15:53:53 +0000 |
parents | 42d11f017717 |
children | a88a3e4e158f |
rev | line source |
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441
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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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5 |
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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 #include <ngx_aio.h> |
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11 |
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12 |
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13 ngx_chain_t *ngx_aio_write_chain(ngx_connection_t *c, ngx_chain_t *in, |
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14 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 off_t send, sent; |
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19 size_t len; |
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20 ssize_t size; |
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21 ngx_err_t err; |
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22 ngx_chain_t *cl; |
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23 |
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24 send = 0; |
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25 sent = 0; |
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26 cl = in; |
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27 |
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28 while (cl) { |
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29 |
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30 if (cl->buf->pos == cl->buf->last) { |
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31 cl = cl->next; |
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32 continue; |
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33 } |
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34 |
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35 /* we can post the single aio operation only */ |
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36 |
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37 if (!c->write->ready) { |
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38 return cl; |
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39 } |
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40 |
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41 buf = cl->buf->pos; |
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42 prev = buf; |
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43 len = 0; |
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44 |
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45 /* coalesce the neighbouring bufs */ |
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46 |
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47 while (cl && prev == cl->buf->pos && send < limit) { |
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48 if (ngx_buf_special(cl->buf)) { |
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49 continue; |
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50 } |
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51 |
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52 size = cl->buf->last - cl->buf->pos; |
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53 |
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54 if (send + size > limit) { |
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55 size = limit - send; |
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56 } |
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57 |
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58 len += size; |
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59 prev = cl->buf->pos + size; |
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60 send += size; |
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61 cl = cl->next; |
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62 } |
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63 |
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64 n = ngx_aio_write(c, buf, len); |
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65 |
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66 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_write: %d", n); |
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67 |
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68 if (n == NGX_ERROR) { |
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69 return NGX_CHAIN_ERROR; |
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70 } |
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71 |
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72 if (n > 0) { |
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73 sent += n; |
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74 c->sent += n; |
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75 } |
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76 |
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77 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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78 "aio_write sent: " OFF_T_FMT, c->sent); |
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79 |
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80 for (cl = in; cl; cl = cl->next) { |
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81 |
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82 if (sent >= cl->buf->last - cl->buf->pos) { |
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83 sent -= cl->buf->last - cl->buf->pos; |
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84 cl->buf->pos = cl->buf->last; |
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85 |
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86 continue; |
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87 } |
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88 |
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89 cl->buf->pos += sent; |
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90 |
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91 break; |
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92 } |
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93 } |
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94 |
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95 return cl; |
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96 } |