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113 lines
3.5 KiB
113 lines
3.5 KiB
/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/* This file integrates the libuv event loop with the libeio thread pool */
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#include "uv.h"
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#include "eio.h"
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#include <assert.h>
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static uv_async_t uv_eio_want_poll_notifier;
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static uv_async_t uv_eio_done_poll_notifier;
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static uv_idle_t uv_eio_poller;
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static int uv_eio_init_count;
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static void uv_eio_do_poll(uv_idle_t* watcher, int status) {
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assert(watcher == &uv_eio_poller);
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/* printf("uv_eio_poller\n"); */
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if (eio_poll() != -1 && uv_is_active((uv_handle_t*) &uv_eio_poller)) {
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/* printf("uv_eio_poller stop\n"); */
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uv_idle_stop(&uv_eio_poller);
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uv_unref();
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}
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}
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/* Called from the main thread. */
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static void uv_eio_want_poll_notifier_cb(uv_async_t* watcher, int status) {
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assert(watcher == &uv_eio_want_poll_notifier);
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/* printf("want poll notifier\n"); */
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if (eio_poll() == -1 && !uv_is_active((uv_handle_t*) &uv_eio_poller)) {
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/* printf("uv_eio_poller start\n"); */
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uv_idle_start(&uv_eio_poller, uv_eio_do_poll);
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uv_ref();
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}
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}
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static void uv_eio_done_poll_notifier_cb(uv_async_t* watcher, int revents) {
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assert(watcher == &uv_eio_done_poll_notifier);
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/* printf("done poll notifier\n"); */
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if (eio_poll() != -1 && uv_is_active((uv_handle_t*) &uv_eio_poller)) {
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/* printf("uv_eio_poller stop\n"); */
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uv_idle_stop(&uv_eio_poller);
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uv_unref();
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}
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}
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/*
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* uv_eio_want_poll() is called from the EIO thread pool each time an EIO
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* request (that is, one of the node.fs.* functions) has completed.
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*/
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static void uv_eio_want_poll(void) {
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/* Signal the main thread that eio_poll need to be processed. */
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uv_async_send(&uv_eio_want_poll_notifier);
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}
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static void uv_eio_done_poll(void) {
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/*
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* Signal the main thread that we should stop calling eio_poll().
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* from the idle watcher.
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*/
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uv_async_send(&uv_eio_done_poll_notifier);
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}
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void uv_eio_init() {
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if (uv_eio_init_count == 0) {
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uv_eio_init_count++;
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uv_idle_init(&uv_eio_poller);
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uv_idle_start(&uv_eio_poller, uv_eio_do_poll);
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uv_async_init(&uv_eio_want_poll_notifier, uv_eio_want_poll_notifier_cb);
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uv_unref();
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uv_async_init(&uv_eio_done_poll_notifier, uv_eio_done_poll_notifier_cb);
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uv_unref();
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eio_init(uv_eio_want_poll, uv_eio_done_poll);
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/*
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* Don't handle more than 10 reqs on each eio_poll(). This is to avoid
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* race conditions. See Node's test/simple/test-eio-race.js
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*/
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eio_set_max_poll_reqs(10);
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}
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}
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