Mercurial > hg > nginx
annotate src/os/unix/ngx_readv_chain.c @ 5852:43512a33e8f2
Merged implementations of ngx_readv_chain().
There's no real need in two separate implementations,
with and without kqueue support.
author | Valentin Bartenev <vbart@nginx.com> |
---|---|
date | Wed, 13 Aug 2014 15:11:45 +0400 |
parents | d1bde5c3c5d2 |
children | b63e829621ab |
rev | line source |
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1 |
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2 /* |
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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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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> |
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11 |
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12 |
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13 #if (IOV_MAX > 64) |
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14 #define NGX_IOVS 64 |
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15 #else |
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16 #define NGX_IOVS IOV_MAX |
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17 #endif |
501 | 18 |
19 | |
20 ssize_t | |
21 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain) | |
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22 { |
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23 u_char *prev; |
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24 ssize_t n, size; |
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25 ngx_err_t err; |
501 | 26 ngx_array_t vec; |
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27 ngx_event_t *rev; |
501 | 28 struct iovec *iov, iovs[NGX_IOVS]; |
188
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29 |
577 | 30 rev = c->read; |
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31 |
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32 #if (NGX_HAVE_KQUEUE) |
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33 |
455 | 34 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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35 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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36 "readv: eof:%d, avail:%d, err:%d", |
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37 rev->pending_eof, rev->available, rev->kq_errno); |
188
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38 |
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39 if (rev->available == 0) { |
587 | 40 if (rev->pending_eof) { |
188
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41 rev->ready = 0; |
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42 rev->eof = 1; |
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43 |
587 | 44 ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno, |
45 "kevent() reported about an closed connection"); | |
46 | |
188
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47 if (rev->kq_errno) { |
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48 rev->error = 1; |
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49 ngx_set_socket_errno(rev->kq_errno); |
587 | 50 return NGX_ERROR; |
188
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51 } |
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52 |
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53 return 0; |
587 | 54 |
55 } else { | |
56 return NGX_AGAIN; | |
188
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57 } |
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58 } |
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59 } |
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60 |
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61 #endif |
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62 |
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63 prev = NULL; |
89
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64 iov = NULL; |
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65 size = 0; |
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66 |
501 | 67 vec.elts = iovs; |
68 vec.nelts = 0; | |
69 vec.size = sizeof(struct iovec); | |
70 vec.nalloc = NGX_IOVS; | |
71 vec.pool = c->pool; | |
73
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72 |
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73 /* coalesce the neighbouring bufs */ |
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74 |
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75 while (chain) { |
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76 if (prev == chain->buf->last) { |
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77 iov->iov_len += chain->buf->end - chain->buf->last; |
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78 |
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79 } else { |
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80 if (vec.nelts >= IOV_MAX) { |
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81 break; |
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82 } |
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83 |
501 | 84 iov = ngx_array_push(&vec); |
85 if (iov == NULL) { | |
86 return NGX_ERROR; | |
87 } | |
88 | |
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89 iov->iov_base = (void *) chain->buf->last; |
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90 iov->iov_len = chain->buf->end - chain->buf->last; |
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91 } |
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92 |
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93 size += chain->buf->end - chain->buf->last; |
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94 prev = chain->buf->end; |
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95 chain = chain->next; |
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96 } |
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97 |
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98 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 99 "readv: %d, last:%d", vec.nelts, iov->iov_len); |
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100 |
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101 rev = c->read; |
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102 |
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103 do { |
501 | 104 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); |
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105 |
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106 if (n >= 0) { |
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107 |
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108 #if (NGX_HAVE_KQUEUE) |
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109 |
455 | 110 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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111 rev->available -= n; |
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112 |
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113 /* |
587 | 114 * rev->available may be negative here because some additional |
115 * bytes may be received between kevent() and recv() | |
188
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116 */ |
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117 |
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118 if (rev->available <= 0) { |
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119 if (!rev->pending_eof) { |
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120 rev->ready = 0; |
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121 } |
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122 |
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123 if (rev->available < 0) { |
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124 rev->available = 0; |
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125 } |
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126 } |
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127 |
605 | 128 if (n == 0) { |
129 | |
130 /* | |
131 * on FreeBSD recv() may return 0 on closed socket | |
132 * even if kqueue reported about available data | |
133 */ | |
134 | |
627 | 135 #if 0 |
605 | 136 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
609 | 137 "readv() returned 0 while kevent() reported " |
605 | 138 "%d available bytes", rev->available); |
627 | 139 #endif |
605 | 140 |
5370
ee78c7705a8e
Fixed handling of the ready flag with kqueue.
Valentin Bartenev <vbart@nginx.com>
parents:
5267
diff
changeset
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141 rev->ready = 0; |
605 | 142 rev->eof = 1; |
143 rev->available = 0; | |
144 } | |
145 | |
188
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nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
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146 return n; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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147 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
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148 |
5852
43512a33e8f2
Merged implementations of ngx_readv_chain().
Valentin Bartenev <vbart@nginx.com>
parents:
5776
diff
changeset
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149 #endif /* NGX_HAVE_KQUEUE */ |
43512a33e8f2
Merged implementations of ngx_readv_chain().
Valentin Bartenev <vbart@nginx.com>
parents:
5776
diff
changeset
|
150 |
5267
13c006f0c40e
Events: honor NGX_USE_GREEDY_EVENT when kqueue support is enabled.
Valentin Bartenev <vbart@nginx.com>
parents:
4597
diff
changeset
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151 if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) { |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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152 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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153 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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154 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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155 if (n == 0) { |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
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156 rev->eof = 1; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
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157 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
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158 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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159 return n; |
73
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
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160 } |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
161 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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162 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
|
163 |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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164 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
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165 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
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166 "readv() not ready"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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167 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
|
168 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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169 } else { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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170 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
|
171 break; |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
172 } |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
173 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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174 } while (err == NGX_EINTR); |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
175 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
176 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
177 |
3642 | 178 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
changeset
|
179 c->read->error = 1; |
73
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
180 } |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
181 |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
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182 return n; |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
183 } |