Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_writev_chain.c @ 5608:659dac82b6f0
release-1.5.12 tag
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 18 Mar 2014 17:08:35 +0400 |
parents | 089cc5154c1e |
children | f9c83484d9ce |
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> |
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10 #include <ngx_event.h> |
93
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11 |
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12 |
597 | 13 #if (IOV_MAX > 64) |
14 #define NGX_IOVS 64 | |
15 #else | |
16 #define NGX_IOVS IOV_MAX | |
17 #endif | |
429
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18 |
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19 |
501 | 20 ngx_chain_t * |
21 ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) | |
93
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22 { |
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23 u_char *prev; |
461 | 24 ssize_t n, size, sent; |
473 | 25 off_t send, prev_send; |
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26 ngx_uint_t eintr, complete; |
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27 ngx_err_t err; |
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28 ngx_array_t vec; |
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29 ngx_chain_t *cl; |
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30 ngx_event_t *wev; |
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31 struct iovec *iov, iovs[NGX_IOVS]; |
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32 |
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33 wev = c->write; |
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34 |
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35 if (!wev->ready) { |
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36 return in; |
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37 } |
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38 |
469 | 39 #if (NGX_HAVE_KQUEUE) |
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40 |
587 | 41 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) { |
537 | 42 (void) ngx_connection_error(c, wev->kq_errno, |
43 "kevent() reported about an closed connection"); | |
257
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44 wev->error = 1; |
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45 return NGX_CHAIN_ERROR; |
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46 } |
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47 |
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48 #endif |
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49 |
473 | 50 /* the maximum limit size is the maximum size_t value - the page size */ |
51 | |
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52 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) { |
477 | 53 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize; |
473 | 54 } |
55 | |
362
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56 send = 0; |
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57 |
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58 vec.elts = iovs; |
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59 vec.size = sizeof(struct iovec); |
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60 vec.nalloc = NGX_IOVS; |
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61 vec.pool = c->pool; |
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62 |
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63 for ( ;; ) { |
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64 prev = NULL; |
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65 iov = NULL; |
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66 eintr = 0; |
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67 complete = 0; |
473 | 68 prev_send = send; |
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69 |
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70 vec.nelts = 0; |
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71 |
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72 /* create the iovec and coalesce the neighbouring bufs */ |
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73 |
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74 for (cl = in; cl && send < limit; cl = cl->next) { |
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75 |
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76 if (ngx_buf_special(cl->buf)) { |
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77 continue; |
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78 } |
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79 |
461 | 80 #if 1 |
81 if (!ngx_buf_in_memory(cl->buf)) { | |
82 ngx_debug_point(); | |
83 } | |
84 #endif | |
85 | |
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86 size = cl->buf->last - cl->buf->pos; |
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87 |
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88 if (send + size > limit) { |
561 | 89 size = (ssize_t) (limit - send); |
362
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90 } |
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91 |
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92 if (prev == cl->buf->pos) { |
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93 iov->iov_len += size; |
93
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94 |
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95 } else { |
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96 if (vec.nelts >= IOV_MAX) { |
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97 break; |
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98 } |
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99 |
501 | 100 iov = ngx_array_push(&vec); |
101 if (iov == NULL) { | |
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102 return NGX_CHAIN_ERROR; |
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103 } |
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104 |
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105 iov->iov_base = (void *) cl->buf->pos; |
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106 iov->iov_len = size; |
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107 } |
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108 |
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109 prev = cl->buf->pos + size; |
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110 send += size; |
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111 } |
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112 |
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113 n = writev(c->fd, vec.elts, vec.nelts); |
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114 |
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115 if (n == -1) { |
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116 err = ngx_errno; |
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117 |
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118 switch (err) { |
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119 case NGX_EAGAIN: |
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120 break; |
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121 |
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122 case NGX_EINTR: |
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123 eintr = 1; |
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124 break; |
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125 |
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126 default: |
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127 wev->error = 1; |
537 | 128 (void) ngx_connection_error(c, err, "writev() failed"); |
198
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129 return NGX_CHAIN_ERROR; |
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195
diff
changeset
|
130 } |
3063
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
131 |
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
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132 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
133 "writev() not ready"); |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
134 } |
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
135 |
198
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
136 sent = n > 0 ? n : 0; |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
137 |
461 | 138 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %z", sent); |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
139 |
473 | 140 if (send - prev_send == sent) { |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
141 complete = 1; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
142 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
143 |
198
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
144 c->sent += sent; |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
145 |
461 | 146 for (cl = in; cl; cl = cl->next) { |
147 | |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
148 if (ngx_buf_special(cl->buf)) { |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
149 continue; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
150 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
151 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
152 if (sent == 0) { |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
153 break; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
154 } |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
155 |
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:
290
diff
changeset
|
156 size = cl->buf->last - cl->buf->pos; |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
157 |
198
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
158 if (sent >= size) { |
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
159 sent -= size; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
160 cl->buf->pos = cl->buf->last; |
198
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
161 |
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
162 continue; |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
163 } |
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
164 |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
165 cl->buf->pos += sent; |
198
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
166 |
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
167 break; |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
168 } |
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
169 |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
170 if (eintr) { |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
171 continue; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
172 } |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
173 |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
174 if (!complete) { |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
175 wev->ready = 0; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
176 return cl; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
177 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
178 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
179 if (send >= limit || cl == NULL) { |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
180 return cl; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
181 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
182 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
183 in = cl; |
93
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
184 } |
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
185 } |