4c87666a93
Don't make a syscall when the handle is already pending. Speeds up the async_pummel benchmark by about 13%.
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to
|
|
* deal in the Software without restriction, including without limitation the
|
|
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
|
* sell copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
* IN THE SOFTWARE.
|
|
*/
|
|
|
|
#include "uv.h"
|
|
#include "internal.h"
|
|
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
static int uv__async_init(uv_loop_t* loop);
|
|
static void uv__async_io(uv_loop_t* loop, uv__io_t* handle, int events);
|
|
|
|
|
|
int uv_async_init(uv_loop_t* loop, uv_async_t* handle, uv_async_cb async_cb) {
|
|
if (uv__async_init(loop))
|
|
return uv__set_sys_error(loop, errno);
|
|
|
|
uv__handle_init(loop, (uv_handle_t*)handle, UV_ASYNC);
|
|
loop->counters.async_init++;
|
|
|
|
handle->async_cb = async_cb;
|
|
handle->pending = 0;
|
|
|
|
ngx_queue_insert_tail(&loop->async_handles, &handle->queue);
|
|
uv__handle_start(handle);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int uv_async_send(uv_async_t* handle) {
|
|
int r;
|
|
|
|
if (handle->pending)
|
|
return 0;
|
|
|
|
handle->pending = 1; /* XXX needs a memory barrier? */
|
|
|
|
do
|
|
r = write(handle->loop->async_pipefd[1], "x", 1);
|
|
while (r == -1 && errno == EINTR);
|
|
|
|
if (r == -1 && errno != EAGAIN && errno != EWOULDBLOCK)
|
|
return uv__set_sys_error(handle->loop, errno);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void uv__async_close(uv_async_t* handle) {
|
|
ngx_queue_remove(&handle->queue);
|
|
uv__handle_stop(handle);
|
|
}
|
|
|
|
|
|
static int uv__async_init(uv_loop_t* loop) {
|
|
if (loop->async_pipefd[0] != -1)
|
|
return 0;
|
|
|
|
if (uv__make_pipe(loop->async_pipefd, UV__F_NONBLOCK))
|
|
return -1;
|
|
|
|
uv__io_init(&loop->async_watcher,
|
|
uv__async_io,
|
|
loop->async_pipefd[0],
|
|
UV__IO_READ);
|
|
uv__io_start(loop, &loop->async_watcher);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void uv__async_io(uv_loop_t* loop, uv__io_t* handle, int events) {
|
|
char buf[1024];
|
|
ngx_queue_t* q;
|
|
uv_async_t* h;
|
|
ssize_t r;
|
|
|
|
while (1) {
|
|
r = read(loop->async_pipefd[0], buf, sizeof(buf));
|
|
|
|
if (r == sizeof(buf))
|
|
continue;
|
|
|
|
if (r != -1)
|
|
break;
|
|
|
|
if (errno == EAGAIN || errno == EWOULDBLOCK)
|
|
break;
|
|
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
abort();
|
|
}
|
|
|
|
ngx_queue_foreach(q, &loop->async_handles) {
|
|
h = ngx_queue_data(q, uv_async_t, queue);
|
|
if (!h->pending) continue;
|
|
h->pending = 0;
|
|
h->async_cb(h, 0);
|
|
}
|
|
}
|