Mercurial > hg > nginx-quic
comparison src/os/unix/ngx_aio_read.c @ 93:738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 21 May 2003 13:28:21 +0000 |
parents | |
children | 6dfda4cf5200 |
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92:19cc647ecd91 | 93:738fe44c70d5 |
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1 | |
2 #include <ngx_config.h> | |
3 #include <ngx_core.h> | |
4 #include <ngx_aio.h> | |
5 | |
6 #if (HAVE_KQUEUE) | |
7 #include <ngx_kqueue_module.h> | |
8 #endif | |
9 | |
10 | |
11 /* | |
12 The data is ready - 3 syscalls: | |
13 aio_read(), aio_error(), aio_return() | |
14 The data is not ready - 4 (kqueue) or 5 syscalls: | |
15 aio_read(), aio_error(), notifiction, | |
16 aio_error(), aio_return() | |
17 aio_cancel(), aio_error() | |
18 */ | |
19 | |
20 | |
21 ssize_t ngx_aio_read(ngx_connection_t *c, char *buf, size_t size) | |
22 { | |
23 int rc, first, canceled; | |
24 ngx_event_t *ev; | |
25 | |
26 ev = c->read; | |
27 | |
28 canceled = 0; | |
29 | |
30 if (ev->timedout) { | |
31 ngx_set_socket_errno(NGX_ETIMEDOUT); | |
32 ngx_log_error(NGX_LOG_ERR, ev->log, 0, "aio_read() timed out"); | |
33 | |
34 rc = aio_cancel(c->fd, &ev->aiocb); | |
35 if (rc == -1) { | |
36 ngx_log_error(NGX_LOG_CRIT, ev->log, ngx_errno, | |
37 "aio_cancel() failed"); | |
38 return NGX_ERROR; | |
39 } | |
40 | |
41 ngx_log_debug(ev->log, "aio_cancel: %d" _ rc); | |
42 | |
43 canceled = 1; | |
44 | |
45 ev->ready = 1; | |
46 } | |
47 | |
48 first = 0; | |
49 | |
50 if (!ev->ready) { | |
51 ngx_memzero(&ev->aiocb, sizeof(struct aiocb)); | |
52 | |
53 ev->aiocb.aio_fildes = c->fd; | |
54 ev->aiocb.aio_buf = buf; | |
55 ev->aiocb.aio_nbytes = size; | |
56 | |
57 #if (HAVE_KQUEUE) | |
58 ev->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue; | |
59 ev->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT; | |
60 ev->aiocb.aio_sigevent.sigev_value.sigval_ptr = ev; | |
61 #endif | |
62 | |
63 if (aio_read(&ev->aiocb) == -1) { | |
64 ngx_log_error(NGX_LOG_CRIT, ev->log, ngx_errno, | |
65 "aio_read() failed"); | |
66 return NGX_ERROR; | |
67 } | |
68 | |
69 ngx_log_debug(ev->log, "aio_read: OK"); | |
70 | |
71 ev->active = 1; | |
72 first = 1; | |
73 } | |
74 | |
75 ev->ready = 0; | |
76 | |
77 rc = aio_error(&ev->aiocb); | |
78 if (rc == -1) { | |
79 ngx_log_error(NGX_LOG_CRIT, ev->log, ngx_errno, "aio_error() failed"); | |
80 return NGX_ERROR; | |
81 } | |
82 | |
83 if (rc != 0) { | |
84 if (rc == NGX_EINPROGRESS) { | |
85 if (!first) { | |
86 ngx_log_error(NGX_LOG_CRIT, ev->log, rc, | |
87 "aio_read() still in progress"); | |
88 } | |
89 return NGX_AGAIN; | |
90 } | |
91 | |
92 if (rc == NGX_ECANCELED && canceled) { | |
93 return NGX_ERROR; | |
94 } | |
95 | |
96 ngx_log_error(NGX_LOG_CRIT, ev->log, rc, "aio_read() failed"); | |
97 return NGX_ERROR; | |
98 } | |
99 | |
100 rc = aio_return(&ev->aiocb); | |
101 if (rc == -1) { | |
102 ngx_log_error(NGX_LOG_CRIT, ev->log, ngx_errno, "aio_return() failed"); | |
103 | |
104 return NGX_ERROR; | |
105 } | |
106 | |
107 ngx_log_debug(ev->log, "aio_read: %d" _ rc); | |
108 | |
109 return rc; | |
110 } |