Mercurial > hg > nginx-quic
annotate src/os/win32/ngx_service.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 | a1caf3989b49 |
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rev | line source |
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441
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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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6 |
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8 |
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9 #define NGX_SERVICE_CONTROL_SHUTDOWN 128 |
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10 #define NGX_SERVICE_CONTROL_REOPEN 129 |
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11 |
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12 |
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13 SERVICE_TABLE_ENTRY st[] = { |
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14 { "nginx", service_main }, |
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15 { NULL, NULL } |
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16 }; |
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17 |
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19 ngx_int_t |
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20 ngx_service(ngx_log_t *log) |
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21 { |
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22 /* primary thread */ |
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23 |
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24 /* StartServiceCtrlDispatcher() should be called within 30 seconds */ |
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25 |
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26 if (StartServiceCtrlDispatcher(st) == 0) { |
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27 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, |
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28 "StartServiceCtrlDispatcher() failed"); |
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29 return NGX_ERROR; |
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30 } |
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31 |
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32 return NGX_OK; |
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33 } |
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34 |
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35 |
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36 void |
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37 service_main(u_int argc, char **argv) |
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38 { |
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39 SERVICE_STATUS status; |
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40 SERVICE_STATUS_HANDLE service; |
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41 |
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42 /* thread spawned by SCM */ |
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43 |
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44 service = RegisterServiceCtrlHandlerEx("nginx", service_handler, ctx); |
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45 if (service == INVALID_HANDLE_VALUE) { |
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46 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, |
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47 "RegisterServiceCtrlHandlerEx() failed"); |
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48 return; |
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49 } |
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50 |
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51 status.dwServiceType = SERVICE_WIN32_OWN_PROCESS; |
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52 status.dwCurrentState = SERVICE_START_PENDING; |
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53 status.dwControlsAccepted = SERVICE_ACCEPT_STOP |
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54 |SERVICE_ACCEPT_PARAMCHANGE; |
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55 status.dwWin32ExitCode = NO_ERROR; |
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56 status.dwServiceSpecificExitCode = 0; |
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57 status.dwCheckPoint = 1; |
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58 status.dwWaitHint = 2000; |
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59 |
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60 /* SetServiceStatus() should be called within 80 seconds */ |
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61 |
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62 if (SetServiceStatus(service, &status) == 0) { |
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63 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, |
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64 "SetServiceStatus() failed"); |
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65 return; |
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66 } |
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67 |
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68 /* init */ |
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69 |
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70 status.dwCurrentState = SERVICE_RUNNING; |
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71 status.dwCheckPoint = 0; |
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72 status.dwWaitHint = 0; |
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73 |
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74 if (SetServiceStatus(service, &status) == 0) { |
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75 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, |
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76 "SetServiceStatus() failed"); |
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77 return; |
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78 } |
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79 |
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80 /* call master or worker loop */ |
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81 |
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82 /* |
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83 * master should use event notification and look status |
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84 * single should use iocp to get notifications from service handler |
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85 */ |
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86 |
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87 } |
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88 |
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89 |
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90 u_int |
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91 service_handler(u_int control, u_int type, void *data, void *ctx) |
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92 { |
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93 /* primary thread */ |
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94 |
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95 switch (control) { |
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96 |
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97 case SERVICE_CONTROL_INTERROGATE: |
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98 status = NGX_IOCP_INTERROGATE; |
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99 break; |
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100 |
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101 case SERVICE_CONTROL_STOP: |
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102 status = NGX_IOCP_STOP; |
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103 break; |
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104 |
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nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
105 case SERVICE_CONTROL_PARAMCHANGE: |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
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106 status = NGX_IOCP_RECONFIGURE; |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
107 break; |
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nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
108 |
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nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
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109 case NGX_SERVICE_CONTROL_SHUTDOWN: |
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nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
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110 status = NGX_IOCP_REOPEN; |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
111 break; |
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nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
112 |
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nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
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113 case NGX_SERVICE_CONTROL_REOPEN: |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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114 status = NGX_IOCP_REOPEN; |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
115 break; |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
116 |
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nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
117 default: |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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118 return ERROR_CALL_NOT_IMPLEMENTED; |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
119 } |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
120 |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
121 if (ngx_single) { |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
122 if (PostQueuedCompletionStatus(iocp, ... status, ...) == 0) { |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
123 err = ngx_errno; |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
124 ngx_log_error(NGX_LOG_ALERT, log, err, |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
125 "PostQueuedCompletionStatus() failed"); |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
126 return err; |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
127 } |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
128 |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
129 } else { |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
130 Event |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
131 } |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
132 |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
133 return NO_ERROR; |
4f81b931e9ff
nginx-0.0.1-2004-01-08-11:47:17 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
134 } |