blob: b0c25085d1f24d4299e340591cf62fabc611244e [file] [log] [blame]
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
ngx_chain_t *
ngx_aio_write_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
{
u_char *buf, *prev;
off_t send, sent;
size_t len;
ssize_t n, size;
ngx_chain_t *cl;
/* the maximum limit size is the maximum size_t value - the page size */
if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) {
limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
}
send = 0;
sent = 0;
cl = in;
while (cl) {
if (cl->buf->pos == cl->buf->last) {
cl = cl->next;
continue;
}
/* we can post the single aio operation only */
if (!c->write->ready) {
return cl;
}
buf = cl->buf->pos;
prev = buf;
len = 0;
/* coalesce the neighbouring bufs */
while (cl && prev == cl->buf->pos && send < limit) {
if (ngx_buf_special(cl->buf)) {
continue;
}
size = cl->buf->last - cl->buf->pos;
if (send + size > limit) {
size = limit - send;
}
len += size;
prev = cl->buf->pos + size;
send += size;
cl = cl->next;
}
n = ngx_aio_write(c, buf, len);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_write: %z", n);
if (n == NGX_ERROR) {
return NGX_CHAIN_ERROR;
}
if (n > 0) {
sent += n;
c->sent += n;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"aio_write sent: %O", c->sent);
for (cl = in; cl; cl = cl->next) {
if (sent >= cl->buf->last - cl->buf->pos) {
sent -= cl->buf->last - cl->buf->pos;
cl->buf->pos = cl->buf->last;
continue;
}
cl->buf->pos += sent;
break;
}
}
return cl;
}