Mercurial > hg > nginx
annotate src/os/win32/ngx_wsarecv_chain.c @ 7583:efd71d49bde0
Events: available bytes calculation via ioctl(FIONREAD).
This makes it possible to avoid looping for a long time while working
with a fast enough peer when data are added to the socket buffer faster
than we are able to read and process them (ticket #1431). This is
basically what we already do on FreeBSD with kqueue, where information
about the number of bytes in the socket buffer is returned by
the kevent() call.
With other event methods rev->available is now set to -1 when the socket
is ready for reading. Later in ngx_recv() and ngx_recv_chain(), if
full buffer is received, real number of bytes in the socket buffer is
retrieved using ioctl(FIONREAD). Reading more than this number of bytes
ensures that even with edge-triggered event methods the event will be
triggered again, so it is safe to stop processing of the socket and
switch to other connections.
Using ioctl(FIONREAD) only after reading a full buffer is an optimization.
With this approach we only call ioctl(FIONREAD) when there are at least
two recv()/readv() calls.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Thu, 17 Oct 2019 16:02:19 +0300 |
parents | ec81934727a1 |
children | ecf2a9002b37 |
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 |
577 | 13 #define NGX_WSABUFS 8 |
501 | 14 |
15 | |
16 ssize_t | |
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17 ngx_wsarecv_chain(ngx_connection_t *c, ngx_chain_t *chain, off_t limit) |
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18 { |
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19 int rc; |
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20 u_char *prev; |
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21 u_long bytes, flags; |
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22 size_t n, size; |
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23 ngx_err_t err; |
501 | 24 ngx_array_t vec; |
186
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25 ngx_event_t *rev; |
501 | 26 LPWSABUF wsabuf; |
27 WSABUF wsabufs[NGX_WSABUFS]; | |
186
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28 |
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29 prev = NULL; |
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30 wsabuf = NULL; |
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31 flags = 0; |
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32 size = 0; |
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33 bytes = 0; |
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34 |
501 | 35 vec.elts = wsabufs; |
36 vec.nelts = 0; | |
37 vec.size = sizeof(WSABUF); | |
577 | 38 vec.nalloc = NGX_WSABUFS; |
501 | 39 vec.pool = c->pool; |
186
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40 |
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41 /* coalesce the neighbouring bufs */ |
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42 |
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43 while (chain) { |
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44 n = chain->buf->end - chain->buf->last; |
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45 |
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46 if (limit) { |
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47 if (size >= (size_t) limit) { |
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48 break; |
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49 } |
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50 |
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51 if (size + n > (size_t) limit) { |
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52 n = (size_t) limit - size; |
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53 } |
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54 } |
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55 |
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56 if (prev == chain->buf->last) { |
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57 wsabuf->len += n; |
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58 |
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59 } else { |
501 | 60 wsabuf = ngx_array_push(&vec); |
61 if (wsabuf == NULL) { | |
62 return NGX_ERROR; | |
63 } | |
64 | |
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65 wsabuf->buf = (char *) chain->buf->last; |
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66 wsabuf->len = n; |
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67 } |
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68 |
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69 size += n; |
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70 prev = chain->buf->end; |
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71 chain = chain->next; |
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72 } |
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73 |
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74 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 75 "WSARecv: %d:%d", vec.nelts, wsabuf->len); |
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76 |
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77 |
501 | 78 rc = WSARecv(c->fd, vec.elts, vec.nelts, &bytes, &flags, NULL, NULL); |
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79 |
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80 rev = c->read; |
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81 |
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82 if (rc == -1) { |
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83 rev->ready = 0; |
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84 err = ngx_socket_errno; |
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85 |
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86 if (err == WSAEWOULDBLOCK) { |
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87 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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88 "WSARecv() not ready"); |
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89 return NGX_AGAIN; |
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90 } |
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91 |
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92 rev->error = 1; |
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93 ngx_connection_error(c, err, "WSARecv() failed"); |
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94 return NGX_ERROR; |
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95 } |
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96 |
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97 #if (NGX_HAVE_FIONREAD) |
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98 |
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99 if (rev->available >= 0 && bytes > 0) { |
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100 rev->available -= bytes; |
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101 |
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102 /* |
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103 * negative rev->available means some additional bytes |
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104 * were received between kernel notification and WSARecv(), |
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105 * and therefore ev->ready can be safely reset even for |
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106 * edge-triggered event methods |
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107 */ |
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108 |
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109 if (rev->available < 0) { |
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110 rev->available = 0; |
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111 rev->ready = 0; |
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112 } |
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113 |
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114 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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115 "WSARecv: avail:%d", rev->available); |
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116 |
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117 } else if (bytes == size) { |
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118 |
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119 if (ngx_socket_nread(c->fd, &rev->available) == -1) { |
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120 rev->error = 1; |
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Events: available bytes calculation via ioctl(FIONREAD).
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121 ngx_connection_error(c, ngx_socket_errno, |
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Events: available bytes calculation via ioctl(FIONREAD).
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122 ngx_socket_nread_n " failed"); |
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Events: available bytes calculation via ioctl(FIONREAD).
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123 return NGX_ERROR; |
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Events: available bytes calculation via ioctl(FIONREAD).
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124 } |
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Events: available bytes calculation via ioctl(FIONREAD).
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125 |
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Events: available bytes calculation via ioctl(FIONREAD).
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126 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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Events: available bytes calculation via ioctl(FIONREAD).
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127 "WSARecv: avail:%d", rev->available); |
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Events: available bytes calculation via ioctl(FIONREAD).
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128 } |
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Events: available bytes calculation via ioctl(FIONREAD).
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parents:
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129 |
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Events: available bytes calculation via ioctl(FIONREAD).
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130 #endif |
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Events: available bytes calculation via ioctl(FIONREAD).
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131 |
186
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Igor Sysoev <igor@sysoev.ru>
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132 if (bytes < size) { |
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133 rev->ready = 0; |
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134 } |
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135 |
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136 if (bytes == 0) { |
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137 rev->eof = 1; |
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138 } |
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139 |
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140 return bytes; |
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141 } |