Annotation of embedaddon/nginx/src/os/unix/ngx_aio_read_chain.c, revision 1.1.1.1
1.1 misho 1:
2: /*
3: * Copyright (C) Igor Sysoev
4: * Copyright (C) Nginx, Inc.
5: */
6:
7:
8: #include <ngx_config.h>
9: #include <ngx_core.h>
10: #include <ngx_event.h>
11:
12:
13: ssize_t
14: ngx_aio_read_chain(ngx_connection_t *c, ngx_chain_t *cl)
15: {
16: int n;
17: u_char *buf, *prev;
18: size_t size;
19: ssize_t total;
20:
21: if (c->read->pending_eof) {
22: c->read->ready = 0;
23: return 0;
24: }
25:
26: total = 0;
27:
28: while (cl) {
29:
30: /* we can post the single aio operation only */
31:
32: if (!c->read->ready) {
33: return total ? total : NGX_AGAIN;
34: }
35:
36: buf = cl->buf->last;
37: prev = cl->buf->last;
38: size = 0;
39:
40: /* coalesce the neighbouring bufs */
41:
42: while (cl && prev == cl->buf->last) {
43: size += cl->buf->end - cl->buf->last;
44: prev = cl->buf->end;
45: cl = cl->next;
46: }
47:
48: n = ngx_aio_read(c, buf, size);
49:
50: ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n);
51:
52: if (n == NGX_AGAIN) {
53: return total ? total : NGX_AGAIN;
54: }
55:
56: if (n == NGX_ERROR) {
57: return NGX_ERROR;
58: }
59:
60: if (n == 0) {
61: c->read->pending_eof = 1;
62: if (total) {
63: c->read->eof = 0;
64: c->read->ready = 1;
65: }
66: return total;
67: }
68:
69: if (n > 0) {
70: total += n;
71: }
72:
73: ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
74: "aio_read total: %d", total);
75: }
76:
77: return total ? total : NGX_AGAIN;
78: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>