135 lines
4.0 KiB
C
135 lines
4.0 KiB
C
/* 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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#include <stdio.h>
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/* TODO remove me! */
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static uv_loop_t* main_loop;
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static void uv_eio_do_poll(uv_idle_t* watcher, int status) {
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assert(watcher == &(watcher->loop->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*) watcher)) {
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/* printf("uv_eio_poller stop\n"); */
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uv_idle_stop(watcher);
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uv_unref(watcher->loop);
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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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uv_loop_t* loop = watcher->loop;
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assert(watcher == &loop->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*) &loop->uv_eio_poller)) {
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/* printf("uv_eio_poller start\n"); */
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uv_idle_start(&loop->uv_eio_poller, uv_eio_do_poll);
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uv_ref(loop);
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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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uv_loop_t* loop = watcher->loop;
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assert(watcher == &loop->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*) &loop->uv_eio_poller)) {
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/* printf("uv_eio_poller stop\n"); */
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uv_idle_stop(&loop->uv_eio_poller);
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uv_unref(loop);
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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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/*
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* TODO need to select the correct uv_loop_t and async_send to
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* uv_eio_want_poll_notifier.
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*/
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uv_async_send(&main_loop->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(&main_loop->uv_eio_done_poll_notifier);
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}
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void uv_eio_init(uv_loop_t* loop) {
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if (loop->counters.eio_init == 0) {
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loop->counters.eio_init++;
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main_loop = loop;
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uv_idle_init(loop, &loop->uv_eio_poller);
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uv_idle_start(&loop->uv_eio_poller, uv_eio_do_poll);
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loop->uv_eio_want_poll_notifier.data = loop;
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uv_async_init(loop, &loop->uv_eio_want_poll_notifier,
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uv_eio_want_poll_notifier_cb);
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uv_unref(loop);
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uv_async_init(loop, &loop->uv_eio_done_poll_notifier,
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uv_eio_done_poll_notifier_cb);
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uv_unref(loop);
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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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} else {
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/*
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* If this assertion breaks then Ryan hasn't implemented support for
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* receiving thread pool requests back to multiple threads.
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*/
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assert(main_loop == loop);
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}
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}
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