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0
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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 u_char *buf, *prev;
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17 off_t send, sent;
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18 size_t len;
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10
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19 ssize_t n, size;
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0
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20 ngx_err_t err;
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21 ngx_chain_t *cl;
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22
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22
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23 /* the maximum limit size is the maximum size_t value - the page size */
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24
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26
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25 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
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26 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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27 }
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28
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0
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29 send = 0;
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30 sent = 0;
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31 cl = in;
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32
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33 while (cl) {
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34
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35 if (cl->buf->pos == cl->buf->last) {
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36 cl = cl->next;
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37 continue;
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38 }
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39
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40 /* we can post the single aio operation only */
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41
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42 if (!c->write->ready) {
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43 return cl;
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44 }
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45
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46 buf = cl->buf->pos;
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47 prev = buf;
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48 len = 0;
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49
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50 /* coalesce the neighbouring bufs */
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51
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52 while (cl && prev == cl->buf->pos && send < limit) {
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53 if (ngx_buf_special(cl->buf)) {
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54 continue;
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55 }
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56
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57 size = cl->buf->last - cl->buf->pos;
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58
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59 if (send + size > limit) {
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60 size = limit - send;
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61 }
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62
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63 len += size;
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64 prev = cl->buf->pos + size;
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65 send += size;
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66 cl = cl->next;
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67 }
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68
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69 n = ngx_aio_write(c, buf, len);
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70
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10
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71 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_write: %z", n);
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0
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72
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73 if (n == NGX_ERROR) {
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74 return NGX_CHAIN_ERROR;
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75 }
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76
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77 if (n > 0) {
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78 sent += n;
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79 c->sent += n;
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80 }
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81
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82 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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83 "aio_write sent: %O", c->sent);
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0
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84
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85 for (cl = in; cl; cl = cl->next) {
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86
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87 if (sent >= cl->buf->last - cl->buf->pos) {
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88 sent -= cl->buf->last - cl->buf->pos;
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89 cl->buf->pos = cl->buf->last;
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90
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91 continue;
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92 }
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93
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94 cl->buf->pos += sent;
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95
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96 break;
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97 }
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98 }
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99
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100 return cl;
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101 }
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