Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_readv_chain.c @ 4500:9dfe02dd0f11
Added msleep() on reload to allow new processes to start.
This is expected to ensure smoother operation on reload (and with less
chance of listen queue overflows).
Prodded by Igor Sysoev.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 28 Feb 2012 11:40:18 +0000 |
parents | d620f497c50f |
children | 4be36d5e78ae |
rev | line source |
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441
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
103
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10 #include <ngx_event.h> |
73
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11 |
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12 |
501 | 13 #define NGX_IOVS 16 |
14 | |
15 | |
469 | 16 #if (NGX_HAVE_KQUEUE) |
188
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17 |
501 | 18 ssize_t |
19 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain) | |
73
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20 { |
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21 u_char *prev; |
164
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22 ssize_t n, size; |
74
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23 ngx_err_t err; |
501 | 24 ngx_array_t vec; |
188
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25 ngx_event_t *rev; |
501 | 26 struct iovec *iov, iovs[NGX_IOVS]; |
188
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27 |
577 | 28 rev = c->read; |
188
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29 |
455 | 30 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
257
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31 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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32 "readv: eof:%d, avail:%d, err:%d", |
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33 rev->pending_eof, rev->available, rev->kq_errno); |
188
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34 |
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35 if (rev->available == 0) { |
587 | 36 if (rev->pending_eof) { |
188
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37 rev->ready = 0; |
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38 rev->eof = 1; |
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39 |
587 | 40 ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno, |
41 "kevent() reported about an closed connection"); | |
42 | |
188
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43 if (rev->kq_errno) { |
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44 rev->error = 1; |
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45 ngx_set_socket_errno(rev->kq_errno); |
587 | 46 return NGX_ERROR; |
188
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47 } |
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48 |
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49 return 0; |
587 | 50 |
51 } else { | |
52 return NGX_AGAIN; | |
188
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53 } |
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54 } |
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55 } |
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56 |
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57 prev = NULL; |
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58 iov = NULL; |
164
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59 size = 0; |
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60 |
501 | 61 vec.elts = iovs; |
62 vec.nelts = 0; | |
63 vec.size = sizeof(struct iovec); | |
64 vec.nalloc = NGX_IOVS; | |
65 vec.pool = c->pool; | |
73
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66 |
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67 /* coalesce the neighbouring bufs */ |
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68 |
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69 while (chain) { |
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70 if (prev == chain->buf->last) { |
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71 iov->iov_len += chain->buf->end - chain->buf->last; |
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72 |
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73 } else { |
501 | 74 iov = ngx_array_push(&vec); |
75 if (iov == NULL) { | |
76 return NGX_ERROR; | |
77 } | |
78 | |
343
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79 iov->iov_base = (void *) chain->buf->last; |
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80 iov->iov_len = chain->buf->end - chain->buf->last; |
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81 } |
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82 |
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83 size += chain->buf->end - chain->buf->last; |
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84 prev = chain->buf->end; |
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85 chain = chain->next; |
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86 } |
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87 |
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88 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 89 "readv: %d, last:%d", vec.nelts, iov->iov_len); |
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90 |
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91 rev = c->read; |
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92 |
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93 do { |
501 | 94 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); |
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95 |
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96 if (n >= 0) { |
455 | 97 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
188
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98 rev->available -= n; |
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99 |
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100 /* |
587 | 101 * rev->available may be negative here because some additional |
102 * bytes may be received between kevent() and recv() | |
188
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103 */ |
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104 |
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105 if (rev->available <= 0) { |
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106 if (!rev->pending_eof) { |
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107 rev->ready = 0; |
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108 } |
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109 |
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110 if (rev->available < 0) { |
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111 rev->available = 0; |
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112 } |
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113 } |
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114 |
605 | 115 if (n == 0) { |
116 | |
117 /* | |
118 * on FreeBSD recv() may return 0 on closed socket | |
119 * even if kqueue reported about available data | |
120 */ | |
121 | |
627 | 122 #if 0 |
605 | 123 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
609 | 124 "readv() returned 0 while kevent() reported " |
605 | 125 "%d available bytes", rev->available); |
627 | 126 #endif |
605 | 127 |
128 rev->eof = 1; | |
129 rev->available = 0; | |
130 } | |
131 | |
188
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132 return n; |
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133 } |
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134 |
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135 if (n < size) { |
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136 rev->ready = 0; |
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137 } |
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138 |
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139 if (n == 0) { |
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140 rev->eof = 1; |
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141 } |
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142 |
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143 return n; |
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144 } |
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Igor Sysoev <igor@sysoev.ru>
parents:
diff
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|
145 |
257
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parents:
188
diff
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146 err = ngx_socket_errno; |
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diff
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147 |
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148 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
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149 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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150 "readv() not ready"); |
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151 n = NGX_AGAIN; |
188
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152 |
257
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153 } else { |
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154 n = ngx_connection_error(c, err, "readv() failed"); |
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155 break; |
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parents:
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156 } |
188
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parents:
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157 |
257
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parents:
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158 } while (err == NGX_EINTR); |
188
0061d1f0908d
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159 |
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160 rev->ready = 0; |
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parents:
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161 |
3642 | 162 if (n == NGX_ERROR) { |
164
84036764e215
nginx-0.0.1-2003-10-29-11:30:44 import
Igor Sysoev <igor@sysoev.ru>
parents:
163
diff
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163 c->read->error = 1; |
73
4534060fde92
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parents:
diff
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164 } |
4534060fde92
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Igor Sysoev <igor@sysoev.ru>
parents:
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165 |
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166 return n; |
4534060fde92
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parents:
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|
167 } |
188
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168 |
469 | 169 #else /* ! NGX_HAVE_KQUEUE */ |
188
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170 |
501 | 171 ssize_t |
172 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain) | |
188
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173 { |
305
4b1a3a4acc60
nginx-0.0.3-2004-04-02-19:13:20 import
Igor Sysoev <igor@sysoev.ru>
parents:
303
diff
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|
174 u_char *prev; |
188
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parents:
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175 ssize_t n, size; |
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176 ngx_err_t err; |
501 | 177 ngx_array_t vec; |
188
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178 ngx_event_t *rev; |
501 | 179 struct iovec *iov, iovs[NGX_IOVS]; |
188
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180 |
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181 prev = NULL; |
0061d1f0908d
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182 iov = NULL; |
0061d1f0908d
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parents:
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183 size = 0; |
0061d1f0908d
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parents:
164
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184 |
501 | 185 vec.elts = iovs; |
186 vec.nelts = 0; | |
187 vec.size = sizeof(struct iovec); | |
188 vec.nalloc = NGX_IOVS; | |
189 vec.pool = c->pool; | |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
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190 |
343
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
Igor Sysoev <igor@sysoev.ru>
parents:
328
diff
changeset
|
191 /* coalesce the neighbouring bufs */ |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
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|
192 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
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193 while (chain) { |
343
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
Igor Sysoev <igor@sysoev.ru>
parents:
328
diff
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|
194 if (prev == chain->buf->last) { |
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
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parents:
328
diff
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195 iov->iov_len += chain->buf->end - chain->buf->last; |
188
0061d1f0908d
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parents:
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196 |
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parents:
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197 } else { |
501 | 198 iov = ngx_array_push(&vec); |
199 if (iov == NULL) { | |
200 return NGX_ERROR; | |
201 } | |
202 | |
561 | 203 iov->iov_base = (void *) chain->buf->last; |
343
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
Igor Sysoev <igor@sysoev.ru>
parents:
328
diff
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|
204 iov->iov_len = chain->buf->end - chain->buf->last; |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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|
205 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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|
206 |
343
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
Igor Sysoev <igor@sysoev.ru>
parents:
328
diff
changeset
|
207 size += chain->buf->end - chain->buf->last; |
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
Igor Sysoev <igor@sysoev.ru>
parents:
328
diff
changeset
|
208 prev = chain->buf->end; |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
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209 chain = chain->next; |
0061d1f0908d
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parents:
164
diff
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|
210 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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|
211 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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|
212 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 213 "readv: %d:%d", vec.nelts, iov->iov_len); |
188
0061d1f0908d
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Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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|
214 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
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|
215 rev = c->read; |
0061d1f0908d
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parents:
164
diff
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|
216 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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|
217 do { |
501 | 218 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); |
188
0061d1f0908d
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parents:
164
diff
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|
219 |
328
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
220 if (n == 0) { |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
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|
221 rev->ready = 0; |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
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|
222 rev->eof = 1; |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
223 |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
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|
224 return n; |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
225 |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
226 } else if (n > 0) { |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
227 |
455 | 228 if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) { |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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|
229 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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|
230 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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|
231 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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|
232 return n; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
233 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
234 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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|
235 err = ngx_socket_errno; |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
236 |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
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parents:
188
diff
changeset
|
237 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
238 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
239 "readv() not ready"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
240 n = NGX_AGAIN; |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
241 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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|
242 } else { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
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parents:
188
diff
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|
243 n = ngx_connection_error(c, err, "readv() failed"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
244 break; |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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|
245 } |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
246 |
257
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nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
247 } while (err == NGX_EINTR); |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
changeset
|
248 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
changeset
|
249 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
250 |
3642 | 251 if (n == NGX_ERROR) { |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
252 c->read->error = 1; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
253 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
254 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
255 return n; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
256 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
257 |
469 | 258 #endif /* NGX_HAVE_KQUEUE */ |