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comparison src/os/unix/ngx_aio_read.c @ 0:f0b350454894 NGINX_0_1_0

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nginx 0.1.0 *) The first public version.
author Igor Sysoev <http://sysoev.ru>
date Mon, 04 Oct 2004 00:00:00 +0400
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children 6f8b0dc0f8dd
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-1:000000000000 0:f0b350454894
1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10 #include <ngx_aio.h>
11
12 #if (HAVE_KQUEUE)
13 #include <ngx_kqueue_module.h>
14 #endif
15
16
17 /*
18 * the ready data requires 3 syscalls:
19 * aio_write(), aio_error(), aio_return()
20 * the non-ready data requires 4 (kqueue) or 5 syscalls:
21 * aio_write(), aio_error(), notifiction, aio_error(), aio_return()
22 * timeout, aio_cancel(), aio_error()
23 */
24
25 ssize_t ngx_aio_read(ngx_connection_t *c, u_char *buf, size_t size)
26 {
27 int n;
28 ngx_event_t *rev;
29
30 rev = c->read;
31
32 if (!rev->ready) {
33 ngx_log_error(NGX_LOG_ALERT, c->log, 0, "second aio post");
34 return NGX_AGAIN;
35 }
36
37 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
38 "rev->complete: %d", rev->complete);
39 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
40 "aio size: %d", size);
41
42 if (!rev->complete) {
43 ngx_memzero(&rev->aiocb, sizeof(struct aiocb));
44
45 rev->aiocb.aio_fildes = c->fd;
46 rev->aiocb.aio_buf = buf;
47 rev->aiocb.aio_nbytes = size;
48
49 #if (HAVE_KQUEUE)
50 rev->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue;
51 rev->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
52 rev->aiocb.aio_sigevent.sigev_value.sigval_ptr = rev;
53 #endif
54
55 if (aio_read(&rev->aiocb) == -1) {
56 ngx_log_error(NGX_LOG_CRIT, rev->log, ngx_errno,
57 "aio_read() failed");
58 rev->error = 1;
59 return NGX_ERROR;
60 }
61
62 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
63 "aio_read: #%d OK", c->fd);
64
65 rev->active = 1;
66 rev->ready = 0;
67 }
68
69 rev->complete = 0;
70
71 n = aio_error(&rev->aiocb);
72 if (n == -1) {
73 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, "aio_error() failed");
74 rev->error = 1;
75 return NGX_ERROR;
76 }
77
78 if (n != 0) {
79 if (n == NGX_EINPROGRESS) {
80 if (rev->ready) {
81 ngx_log_error(NGX_LOG_ALERT, c->log, n,
82 "aio_read() still in progress");
83 rev->ready = 0;
84 }
85 return NGX_AGAIN;
86 }
87
88 ngx_log_error(NGX_LOG_CRIT, c->log, n, "aio_read() failed");
89 rev->error = 1;
90 rev->ready = 0;
91 return NGX_ERROR;
92 }
93
94 n = aio_return(&rev->aiocb);
95 if (n == -1) {
96 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
97 "aio_return() failed");
98
99 rev->error = 1;
100 rev->ready = 0;
101 return NGX_ERROR;
102 }
103
104 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, rev->log, 0,
105 "aio_read: #%d %d", c->fd, n);
106
107 if (n == 0) {
108 rev->eof = 1;
109 rev->ready = 0;
110 } else {
111 rev->ready = 1;
112 }
113
114 rev->active = 0;
115
116 return n;
117 }