forked from cory/tildefriends
Cory McWilliams
79022e1e1f
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3621 ed5197a5-7fde-0310-b194-c3ffbd925b24
749 lines
20 KiB
C
749 lines
20 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 <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined(_MSC_VER) || defined(__MINGW64_VERSION_MAJOR)
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#include <crtdbg.h>
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#endif
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#include "uv.h"
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#include "internal.h"
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#include "queue.h"
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#include "handle-inl.h"
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#include "heap-inl.h"
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#include "req-inl.h"
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/* uv_once initialization guards */
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static uv_once_t uv_init_guard_ = UV_ONCE_INIT;
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#if defined(_DEBUG) && (defined(_MSC_VER) || defined(__MINGW64_VERSION_MAJOR))
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/* Our crt debug report handler allows us to temporarily disable asserts
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* just for the current thread.
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*/
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UV_THREAD_LOCAL int uv__crt_assert_enabled = TRUE;
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static int uv__crt_dbg_report_handler(int report_type, char *message, int *ret_val) {
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if (uv__crt_assert_enabled || report_type != _CRT_ASSERT)
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return FALSE;
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if (ret_val) {
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/* Set ret_val to 0 to continue with normal execution.
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* Set ret_val to 1 to trigger a breakpoint.
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*/
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if(IsDebuggerPresent())
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*ret_val = 1;
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else
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*ret_val = 0;
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}
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/* Don't call _CrtDbgReport. */
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return TRUE;
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}
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#else
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UV_THREAD_LOCAL int uv__crt_assert_enabled = FALSE;
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#endif
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#if !defined(__MINGW32__) || __MSVCRT_VERSION__ >= 0x800
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static void uv__crt_invalid_parameter_handler(const wchar_t* expression,
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const wchar_t* function, const wchar_t * file, unsigned int line,
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uintptr_t reserved) {
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/* No-op. */
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}
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#endif
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static uv_loop_t** uv__loops;
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static int uv__loops_size;
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static int uv__loops_capacity;
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#define UV__LOOPS_CHUNK_SIZE 8
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static uv_mutex_t uv__loops_lock;
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static void uv__loops_init(void) {
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uv_mutex_init(&uv__loops_lock);
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}
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static int uv__loops_add(uv_loop_t* loop) {
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uv_loop_t** new_loops;
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int new_capacity, i;
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uv_mutex_lock(&uv__loops_lock);
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if (uv__loops_size == uv__loops_capacity) {
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new_capacity = uv__loops_capacity + UV__LOOPS_CHUNK_SIZE;
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new_loops = uv__realloc(uv__loops, sizeof(uv_loop_t*) * new_capacity);
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if (!new_loops)
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goto failed_loops_realloc;
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uv__loops = new_loops;
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for (i = uv__loops_capacity; i < new_capacity; ++i)
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uv__loops[i] = NULL;
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uv__loops_capacity = new_capacity;
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}
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uv__loops[uv__loops_size] = loop;
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++uv__loops_size;
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uv_mutex_unlock(&uv__loops_lock);
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return 0;
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failed_loops_realloc:
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uv_mutex_unlock(&uv__loops_lock);
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return ERROR_OUTOFMEMORY;
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}
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static void uv__loops_remove(uv_loop_t* loop) {
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int loop_index;
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int smaller_capacity;
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uv_loop_t** new_loops;
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uv_mutex_lock(&uv__loops_lock);
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for (loop_index = 0; loop_index < uv__loops_size; ++loop_index) {
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if (uv__loops[loop_index] == loop)
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break;
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}
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/* If loop was not found, ignore */
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if (loop_index == uv__loops_size)
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goto loop_removed;
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uv__loops[loop_index] = uv__loops[uv__loops_size - 1];
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uv__loops[uv__loops_size - 1] = NULL;
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--uv__loops_size;
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if (uv__loops_size == 0) {
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uv__loops_capacity = 0;
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uv__free(uv__loops);
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uv__loops = NULL;
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goto loop_removed;
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}
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/* If we didn't grow to big skip downsizing */
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if (uv__loops_capacity < 4 * UV__LOOPS_CHUNK_SIZE)
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goto loop_removed;
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/* Downsize only if more than half of buffer is free */
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smaller_capacity = uv__loops_capacity / 2;
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if (uv__loops_size >= smaller_capacity)
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goto loop_removed;
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new_loops = uv__realloc(uv__loops, sizeof(uv_loop_t*) * smaller_capacity);
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if (!new_loops)
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goto loop_removed;
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uv__loops = new_loops;
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uv__loops_capacity = smaller_capacity;
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loop_removed:
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uv_mutex_unlock(&uv__loops_lock);
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}
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void uv__wake_all_loops(void) {
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int i;
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uv_loop_t* loop;
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uv_mutex_lock(&uv__loops_lock);
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for (i = 0; i < uv__loops_size; ++i) {
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loop = uv__loops[i];
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assert(loop);
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if (loop->iocp != INVALID_HANDLE_VALUE)
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PostQueuedCompletionStatus(loop->iocp, 0, 0, NULL);
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}
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uv_mutex_unlock(&uv__loops_lock);
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}
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static void uv_init(void) {
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/* Tell Windows that we will handle critical errors. */
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SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX |
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SEM_NOOPENFILEERRORBOX);
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/* Tell the CRT to not exit the application when an invalid parameter is
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* passed. The main issue is that invalid FDs will trigger this behavior.
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*/
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#if !defined(__MINGW32__) || __MSVCRT_VERSION__ >= 0x800
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_set_invalid_parameter_handler(uv__crt_invalid_parameter_handler);
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#endif
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/* We also need to setup our debug report handler because some CRT
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* functions (eg _get_osfhandle) raise an assert when called with invalid
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* FDs even though they return the proper error code in the release build.
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*/
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#if defined(_DEBUG) && (defined(_MSC_VER) || defined(__MINGW64_VERSION_MAJOR))
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_CrtSetReportHook(uv__crt_dbg_report_handler);
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#endif
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/* Initialize tracking of all uv loops */
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uv__loops_init();
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/* Fetch winapi function pointers. This must be done first because other
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* initialization code might need these function pointers to be loaded.
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*/
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uv_winapi_init();
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/* Initialize winsock */
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uv_winsock_init();
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/* Initialize FS */
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uv_fs_init();
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/* Initialize signal stuff */
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uv_signals_init();
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/* Initialize console */
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uv_console_init();
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/* Initialize utilities */
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uv__util_init();
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/* Initialize system wakeup detection */
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uv__init_detect_system_wakeup();
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}
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int uv_loop_init(uv_loop_t* loop) {
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uv__loop_internal_fields_t* lfields;
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struct heap* timer_heap;
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int err;
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/* Initialize libuv itself first */
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uv__once_init();
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/* Create an I/O completion port */
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loop->iocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 1);
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if (loop->iocp == NULL)
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return uv_translate_sys_error(GetLastError());
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lfields = (uv__loop_internal_fields_t*) uv__calloc(1, sizeof(*lfields));
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if (lfields == NULL)
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return UV_ENOMEM;
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loop->internal_fields = lfields;
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err = uv_mutex_init(&lfields->loop_metrics.lock);
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if (err)
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goto fail_metrics_mutex_init;
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/* To prevent uninitialized memory access, loop->time must be initialized
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* to zero before calling uv_update_time for the first time.
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*/
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loop->time = 0;
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uv_update_time(loop);
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QUEUE_INIT(&loop->wq);
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QUEUE_INIT(&loop->handle_queue);
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loop->active_reqs.count = 0;
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loop->active_handles = 0;
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loop->pending_reqs_tail = NULL;
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loop->endgame_handles = NULL;
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loop->timer_heap = timer_heap = uv__malloc(sizeof(*timer_heap));
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if (timer_heap == NULL) {
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err = UV_ENOMEM;
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goto fail_timers_alloc;
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}
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heap_init(timer_heap);
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loop->check_handles = NULL;
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loop->prepare_handles = NULL;
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loop->idle_handles = NULL;
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loop->next_prepare_handle = NULL;
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loop->next_check_handle = NULL;
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loop->next_idle_handle = NULL;
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memset(&loop->poll_peer_sockets, 0, sizeof loop->poll_peer_sockets);
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loop->active_tcp_streams = 0;
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loop->active_udp_streams = 0;
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loop->timer_counter = 0;
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loop->stop_flag = 0;
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err = uv_mutex_init(&loop->wq_mutex);
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if (err)
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goto fail_mutex_init;
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err = uv_async_init(loop, &loop->wq_async, uv__work_done);
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if (err)
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goto fail_async_init;
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uv__handle_unref(&loop->wq_async);
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loop->wq_async.flags |= UV_HANDLE_INTERNAL;
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err = uv__loops_add(loop);
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if (err)
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goto fail_async_init;
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return 0;
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fail_async_init:
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uv_mutex_destroy(&loop->wq_mutex);
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fail_mutex_init:
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uv__free(timer_heap);
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loop->timer_heap = NULL;
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fail_timers_alloc:
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uv_mutex_destroy(&lfields->loop_metrics.lock);
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fail_metrics_mutex_init:
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uv__free(lfields);
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loop->internal_fields = NULL;
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CloseHandle(loop->iocp);
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loop->iocp = INVALID_HANDLE_VALUE;
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return err;
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}
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void uv_update_time(uv_loop_t* loop) {
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uint64_t new_time = uv__hrtime(1000);
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assert(new_time >= loop->time);
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loop->time = new_time;
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}
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void uv__once_init(void) {
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uv_once(&uv_init_guard_, uv_init);
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}
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void uv__loop_close(uv_loop_t* loop) {
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uv__loop_internal_fields_t* lfields;
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size_t i;
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uv__loops_remove(loop);
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/* Close the async handle without needing an extra loop iteration.
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* We might have a pending message, but we're just going to destroy the IOCP
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* soon, so we can just discard it now without the usual risk of a getting
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* another notification from GetQueuedCompletionStatusEx after calling the
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* close_cb (which we also skip defining). We'll assert later that queue was
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* actually empty and all reqs handled. */
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loop->wq_async.async_sent = 0;
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loop->wq_async.close_cb = NULL;
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uv__handle_closing(&loop->wq_async);
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uv__handle_close(&loop->wq_async);
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for (i = 0; i < ARRAY_SIZE(loop->poll_peer_sockets); i++) {
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SOCKET sock = loop->poll_peer_sockets[i];
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if (sock != 0 && sock != INVALID_SOCKET)
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closesocket(sock);
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}
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uv_mutex_lock(&loop->wq_mutex);
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assert(QUEUE_EMPTY(&loop->wq) && "thread pool work queue not empty!");
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assert(!uv__has_active_reqs(loop));
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uv_mutex_unlock(&loop->wq_mutex);
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uv_mutex_destroy(&loop->wq_mutex);
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uv__free(loop->timer_heap);
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loop->timer_heap = NULL;
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lfields = uv__get_internal_fields(loop);
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uv_mutex_destroy(&lfields->loop_metrics.lock);
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uv__free(lfields);
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loop->internal_fields = NULL;
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CloseHandle(loop->iocp);
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}
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int uv__loop_configure(uv_loop_t* loop, uv_loop_option option, va_list ap) {
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uv__loop_internal_fields_t* lfields;
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lfields = uv__get_internal_fields(loop);
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if (option == UV_METRICS_IDLE_TIME) {
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lfields->flags |= UV_METRICS_IDLE_TIME;
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return 0;
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}
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return UV_ENOSYS;
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}
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int uv_backend_fd(const uv_loop_t* loop) {
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return -1;
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}
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int uv_loop_fork(uv_loop_t* loop) {
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return UV_ENOSYS;
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}
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int uv_backend_timeout(const uv_loop_t* loop) {
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if (loop->stop_flag != 0)
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return 0;
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if (!uv__has_active_handles(loop) && !uv__has_active_reqs(loop))
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return 0;
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if (loop->pending_reqs_tail)
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return 0;
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if (loop->endgame_handles)
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return 0;
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|
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if (loop->idle_handles)
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return 0;
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return uv__next_timeout(loop);
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}
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static void uv__poll_wine(uv_loop_t* loop, DWORD timeout) {
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DWORD bytes;
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ULONG_PTR key;
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OVERLAPPED* overlapped;
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uv_req_t* req;
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int repeat;
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uint64_t timeout_time;
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uint64_t user_timeout;
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int reset_timeout;
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timeout_time = loop->time + timeout;
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if (uv__get_internal_fields(loop)->flags & UV_METRICS_IDLE_TIME) {
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reset_timeout = 1;
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user_timeout = timeout;
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timeout = 0;
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} else {
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reset_timeout = 0;
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}
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|
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for (repeat = 0; ; repeat++) {
|
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/* Only need to set the provider_entry_time if timeout != 0. The function
|
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* will return early if the loop isn't configured with UV_METRICS_IDLE_TIME.
|
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*/
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if (timeout != 0)
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uv__metrics_set_provider_entry_time(loop);
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GetQueuedCompletionStatus(loop->iocp,
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&bytes,
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&key,
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&overlapped,
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timeout);
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|
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if (reset_timeout != 0) {
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timeout = user_timeout;
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reset_timeout = 0;
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}
|
|
|
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/* Placed here because on success the loop will break whether there is an
|
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* empty package or not, or if GetQueuedCompletionStatus returned early then
|
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* the timeout will be updated and the loop will run again. In either case
|
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* the idle time will need to be updated.
|
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*/
|
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uv__metrics_update_idle_time(loop);
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|
|
|
if (overlapped) {
|
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/* Package was dequeued */
|
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req = uv_overlapped_to_req(overlapped);
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uv_insert_pending_req(loop, req);
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|
|
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/* Some time might have passed waiting for I/O,
|
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* so update the loop time here.
|
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*/
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uv_update_time(loop);
|
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} else if (GetLastError() != WAIT_TIMEOUT) {
|
|
/* Serious error */
|
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uv_fatal_error(GetLastError(), "GetQueuedCompletionStatus");
|
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} else if (timeout > 0) {
|
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/* GetQueuedCompletionStatus can occasionally return a little early.
|
|
* Make sure that the desired timeout target time is reached.
|
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*/
|
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uv_update_time(loop);
|
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if (timeout_time > loop->time) {
|
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timeout = (DWORD)(timeout_time - loop->time);
|
|
/* The first call to GetQueuedCompletionStatus should return very
|
|
* close to the target time and the second should reach it, but
|
|
* this is not stated in the documentation. To make sure a busy
|
|
* loop cannot happen, the timeout is increased exponentially
|
|
* starting on the third round.
|
|
*/
|
|
timeout += repeat ? (1 << (repeat - 1)) : 0;
|
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continue;
|
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}
|
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}
|
|
break;
|
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}
|
|
}
|
|
|
|
|
|
static void uv__poll(uv_loop_t* loop, DWORD timeout) {
|
|
BOOL success;
|
|
uv_req_t* req;
|
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OVERLAPPED_ENTRY overlappeds[128];
|
|
ULONG count;
|
|
ULONG i;
|
|
int repeat;
|
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uint64_t timeout_time;
|
|
uint64_t user_timeout;
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|
int reset_timeout;
|
|
|
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timeout_time = loop->time + timeout;
|
|
|
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if (uv__get_internal_fields(loop)->flags & UV_METRICS_IDLE_TIME) {
|
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reset_timeout = 1;
|
|
user_timeout = timeout;
|
|
timeout = 0;
|
|
} else {
|
|
reset_timeout = 0;
|
|
}
|
|
|
|
for (repeat = 0; ; repeat++) {
|
|
/* Only need to set the provider_entry_time if timeout != 0. The function
|
|
* will return early if the loop isn't configured with UV_METRICS_IDLE_TIME.
|
|
*/
|
|
if (timeout != 0)
|
|
uv__metrics_set_provider_entry_time(loop);
|
|
|
|
success = pGetQueuedCompletionStatusEx(loop->iocp,
|
|
overlappeds,
|
|
ARRAY_SIZE(overlappeds),
|
|
&count,
|
|
timeout,
|
|
FALSE);
|
|
|
|
if (reset_timeout != 0) {
|
|
timeout = user_timeout;
|
|
reset_timeout = 0;
|
|
}
|
|
|
|
/* Placed here because on success the loop will break whether there is an
|
|
* empty package or not, or if GetQueuedCompletionStatus returned early then
|
|
* the timeout will be updated and the loop will run again. In either case
|
|
* the idle time will need to be updated.
|
|
*/
|
|
uv__metrics_update_idle_time(loop);
|
|
|
|
if (success) {
|
|
for (i = 0; i < count; i++) {
|
|
/* Package was dequeued, but see if it is not a empty package
|
|
* meant only to wake us up.
|
|
*/
|
|
if (overlappeds[i].lpOverlapped) {
|
|
req = uv_overlapped_to_req(overlappeds[i].lpOverlapped);
|
|
uv_insert_pending_req(loop, req);
|
|
}
|
|
}
|
|
|
|
/* Some time might have passed waiting for I/O,
|
|
* so update the loop time here.
|
|
*/
|
|
uv_update_time(loop);
|
|
} else if (GetLastError() != WAIT_TIMEOUT) {
|
|
/* Serious error */
|
|
uv_fatal_error(GetLastError(), "GetQueuedCompletionStatusEx");
|
|
} else if (timeout > 0) {
|
|
/* GetQueuedCompletionStatus can occasionally return a little early.
|
|
* Make sure that the desired timeout target time is reached.
|
|
*/
|
|
uv_update_time(loop);
|
|
if (timeout_time > loop->time) {
|
|
timeout = (DWORD)(timeout_time - loop->time);
|
|
/* The first call to GetQueuedCompletionStatus should return very
|
|
* close to the target time and the second should reach it, but
|
|
* this is not stated in the documentation. To make sure a busy
|
|
* loop cannot happen, the timeout is increased exponentially
|
|
* starting on the third round.
|
|
*/
|
|
timeout += repeat ? (1 << (repeat - 1)) : 0;
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static int uv__loop_alive(const uv_loop_t* loop) {
|
|
return uv__has_active_handles(loop) ||
|
|
uv__has_active_reqs(loop) ||
|
|
loop->endgame_handles != NULL;
|
|
}
|
|
|
|
|
|
int uv_loop_alive(const uv_loop_t* loop) {
|
|
return uv__loop_alive(loop);
|
|
}
|
|
|
|
|
|
int uv_run(uv_loop_t *loop, uv_run_mode mode) {
|
|
DWORD timeout;
|
|
int r;
|
|
int ran_pending;
|
|
|
|
r = uv__loop_alive(loop);
|
|
if (!r)
|
|
uv_update_time(loop);
|
|
|
|
while (r != 0 && loop->stop_flag == 0) {
|
|
uv_update_time(loop);
|
|
uv__run_timers(loop);
|
|
|
|
ran_pending = uv_process_reqs(loop);
|
|
uv_idle_invoke(loop);
|
|
uv_prepare_invoke(loop);
|
|
|
|
timeout = 0;
|
|
if ((mode == UV_RUN_ONCE && !ran_pending) || mode == UV_RUN_DEFAULT)
|
|
timeout = uv_backend_timeout(loop);
|
|
|
|
if (pGetQueuedCompletionStatusEx)
|
|
uv__poll(loop, timeout);
|
|
else
|
|
uv__poll_wine(loop, timeout);
|
|
|
|
/* Run one final update on the provider_idle_time in case uv__poll*
|
|
* returned because the timeout expired, but no events were received. This
|
|
* call will be ignored if the provider_entry_time was either never set (if
|
|
* the timeout == 0) or was already updated b/c an event was received.
|
|
*/
|
|
uv__metrics_update_idle_time(loop);
|
|
|
|
uv_check_invoke(loop);
|
|
uv_process_endgames(loop);
|
|
|
|
if (mode == UV_RUN_ONCE) {
|
|
/* UV_RUN_ONCE implies forward progress: at least one callback must have
|
|
* been invoked when it returns. uv__io_poll() can return without doing
|
|
* I/O (meaning: no callbacks) when its timeout expires - which means we
|
|
* have pending timers that satisfy the forward progress constraint.
|
|
*
|
|
* UV_RUN_NOWAIT makes no guarantees about progress so it's omitted from
|
|
* the check.
|
|
*/
|
|
uv__run_timers(loop);
|
|
}
|
|
|
|
r = uv__loop_alive(loop);
|
|
if (mode == UV_RUN_ONCE || mode == UV_RUN_NOWAIT)
|
|
break;
|
|
}
|
|
|
|
/* The if statement lets the compiler compile it to a conditional store.
|
|
* Avoids dirtying a cache line.
|
|
*/
|
|
if (loop->stop_flag != 0)
|
|
loop->stop_flag = 0;
|
|
|
|
return r;
|
|
}
|
|
|
|
|
|
int uv_fileno(const uv_handle_t* handle, uv_os_fd_t* fd) {
|
|
uv_os_fd_t fd_out;
|
|
|
|
switch (handle->type) {
|
|
case UV_TCP:
|
|
fd_out = (uv_os_fd_t)((uv_tcp_t*) handle)->socket;
|
|
break;
|
|
|
|
case UV_NAMED_PIPE:
|
|
fd_out = ((uv_pipe_t*) handle)->handle;
|
|
break;
|
|
|
|
case UV_TTY:
|
|
fd_out = ((uv_tty_t*) handle)->handle;
|
|
break;
|
|
|
|
case UV_UDP:
|
|
fd_out = (uv_os_fd_t)((uv_udp_t*) handle)->socket;
|
|
break;
|
|
|
|
case UV_POLL:
|
|
fd_out = (uv_os_fd_t)((uv_poll_t*) handle)->socket;
|
|
break;
|
|
|
|
default:
|
|
return UV_EINVAL;
|
|
}
|
|
|
|
if (uv_is_closing(handle) || fd_out == INVALID_HANDLE_VALUE)
|
|
return UV_EBADF;
|
|
|
|
*fd = fd_out;
|
|
return 0;
|
|
}
|
|
|
|
|
|
int uv__socket_sockopt(uv_handle_t* handle, int optname, int* value) {
|
|
int r;
|
|
int len;
|
|
SOCKET socket;
|
|
|
|
if (handle == NULL || value == NULL)
|
|
return UV_EINVAL;
|
|
|
|
if (handle->type == UV_TCP)
|
|
socket = ((uv_tcp_t*) handle)->socket;
|
|
else if (handle->type == UV_UDP)
|
|
socket = ((uv_udp_t*) handle)->socket;
|
|
else
|
|
return UV_ENOTSUP;
|
|
|
|
len = sizeof(*value);
|
|
|
|
if (*value == 0)
|
|
r = getsockopt(socket, SOL_SOCKET, optname, (char*) value, &len);
|
|
else
|
|
r = setsockopt(socket, SOL_SOCKET, optname, (const char*) value, len);
|
|
|
|
if (r == SOCKET_ERROR)
|
|
return uv_translate_sys_error(WSAGetLastError());
|
|
|
|
return 0;
|
|
}
|
|
|
|
int uv_cpumask_size(void) {
|
|
return (int)(sizeof(DWORD_PTR) * 8);
|
|
}
|
|
|
|
int uv__getsockpeername(const uv_handle_t* handle,
|
|
uv__peersockfunc func,
|
|
struct sockaddr* name,
|
|
int* namelen,
|
|
int delayed_error) {
|
|
|
|
int result;
|
|
uv_os_fd_t fd;
|
|
|
|
result = uv_fileno(handle, &fd);
|
|
if (result != 0)
|
|
return result;
|
|
|
|
if (delayed_error)
|
|
return uv_translate_sys_error(delayed_error);
|
|
|
|
result = func((SOCKET) fd, name, namelen);
|
|
if (result != 0)
|
|
return uv_translate_sys_error(WSAGetLastError());
|
|
|
|
return 0;
|
|
}
|