4f5c8da191
Implement a best effort approach to mitigating accept() EMFILE errors. We have a spare file descriptor stashed away that we close to get below the EMFILE limit. Next, we accept all pending connections and close them immediately to signal the clients that we're overloaded - and we are, but we still keep on trucking. There is one caveat: it's not reliable in a multi-threaded environment. The file descriptor limit is per process. Our party trick fails if another thread opens a file or creates a socket in the time window between us calling close() and accept(). Fixes #315.
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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*
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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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#include "uv.h"
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#include "tree.h"
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#include "internal.h"
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int uv__loop_init(uv_loop_t* loop, int default_loop) {
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unsigned int i;
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int flags;
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#if HAVE_KQUEUE
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flags = EVBACKEND_KQUEUE;
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#else
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flags = EVFLAG_AUTO;
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#endif
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memset(loop, 0, sizeof(*loop));
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RB_INIT(&loop->timer_handles);
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ngx_queue_init(&loop->active_reqs);
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ngx_queue_init(&loop->idle_handles);
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ngx_queue_init(&loop->async_handles);
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ngx_queue_init(&loop->check_handles);
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ngx_queue_init(&loop->prepare_handles);
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ngx_queue_init(&loop->handle_queue);
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loop->closing_handles = NULL;
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loop->signal_ctx = NULL;
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loop->time = uv_hrtime() / 1000000;
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loop->async_pipefd[0] = -1;
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loop->async_pipefd[1] = -1;
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loop->emfile_fd = -1;
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loop->ev = (default_loop ? ev_default_loop : ev_loop_new)(flags);
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ev_set_userdata(loop->ev, loop);
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eio_channel_init(&loop->uv_eio_channel, loop);
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uv_signal_init(loop, &loop->child_watcher);
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uv__handle_unref(&loop->child_watcher);
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loop->child_watcher.flags |= UV__HANDLE_INTERNAL;
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for (i = 0; i < ARRAY_SIZE(loop->process_handles); i++)
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ngx_queue_init(loop->process_handles + i);
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if (uv__platform_loop_init(loop, default_loop))
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return -1;
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return 0;
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}
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void uv__loop_delete(uv_loop_t* loop) {
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uv__platform_loop_delete(loop);
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uv__signal_unregister(loop);
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ev_loop_destroy(loop->ev);
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if (loop->emfile_fd != -1) {
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close(loop->emfile_fd);
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loop->emfile_fd = -1;
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}
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}
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