Mercurial > hg > nginx
annotate src/os/unix/ngx_aio_write_chain.c @ 3044:a1d54c705f38
*) move small declarations in appropriate places and delete the surplus
header files
*) delete insignificant comments
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 25 Aug 2009 09:09:13 +0000 |
parents | f69d1aab6a0f |
children | d620f497c50f |
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 |
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11 |
577 | 12 ngx_chain_t * |
13 ngx_aio_write_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) | |
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14 { |
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15 u_char *buf, *prev; |
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16 off_t send, sent; |
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17 size_t len; |
461 | 18 ssize_t n, size; |
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19 ngx_chain_t *cl; |
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20 |
473 | 21 /* the maximum limit size is the maximum size_t value - the page size */ |
22 | |
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23 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) { |
477 | 24 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize; |
473 | 25 } |
26 | |
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27 send = 0; |
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28 sent = 0; |
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29 cl = in; |
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30 |
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31 while (cl) { |
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32 |
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33 if (cl->buf->pos == cl->buf->last) { |
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34 cl = cl->next; |
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35 continue; |
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36 } |
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37 |
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38 /* we can post the single aio operation only */ |
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39 |
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40 if (!c->write->ready) { |
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41 return cl; |
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42 } |
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43 |
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44 buf = cl->buf->pos; |
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45 prev = buf; |
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46 len = 0; |
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47 |
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48 /* coalesce the neighbouring bufs */ |
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49 |
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50 while (cl && prev == cl->buf->pos && send < limit) { |
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51 if (ngx_buf_special(cl->buf)) { |
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52 continue; |
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53 } |
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54 |
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55 size = cl->buf->last - cl->buf->pos; |
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56 |
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57 if (send + size > limit) { |
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58 size = limit - send; |
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59 } |
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60 |
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61 len += size; |
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62 prev = cl->buf->pos + size; |
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63 send += size; |
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64 cl = cl->next; |
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65 } |
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66 |
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67 n = ngx_aio_write(c, buf, len); |
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68 |
461 | 69 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_write: %z", n); |
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70 |
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71 if (n == NGX_ERROR) { |
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72 return NGX_CHAIN_ERROR; |
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73 } |
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74 |
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75 if (n > 0) { |
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76 sent += n; |
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77 c->sent += n; |
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78 } |
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79 |
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80 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
461 | 81 "aio_write sent: %O", c->sent); |
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82 |
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83 for (cl = in; cl; cl = cl->next) { |
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84 |
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85 if (sent >= cl->buf->last - cl->buf->pos) { |
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86 sent -= cl->buf->last - cl->buf->pos; |
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87 cl->buf->pos = cl->buf->last; |
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88 |
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89 continue; |
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90 } |
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91 |
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92 cl->buf->pos += sent; |
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93 |
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94 break; |
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95 } |
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96 } |
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97 |
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98 return cl; |
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99 } |