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/* 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 <assert.h>
#include <errno.h>
#include <limits.h>
#include <malloc.h>
#include <stdio.h>
#include <string.h>
#include "uv.h"
#include "../uv-common.h"
#include "internal.h"
/* The only event loop we support right now */
static uv_loop_t uv_default_loop_;
/* uv_once intialization guards */
static uv_once_t uv_init_guard_ = UV_ONCE_INIT;
static uv_once_t uv_default_loop_init_guard_ = UV_ONCE_INIT;
static void uv_init(void) {
/* Initialize winsock */
uv_winsock_init();
/* Fetch winapi function pointers */
uv_winapi_init();
/* Initialize FS */
uv_fs_init();
/* Initialize console */
uv_console_init();
}
void uv_loop_init(uv_loop_t* loop) {
/* Create an I/O completion port */
loop->iocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 1);
if (loop->iocp == NULL) {
uv_fatal_error(GetLastError(), "CreateIoCompletionPort");
}
loop->refs = 0;
uv_update_time(loop);
loop->pending_reqs_tail = NULL;
loop->endgame_handles = NULL;
RB_INIT(&loop->timers);
loop->check_handles = NULL;
loop->prepare_handles = NULL;
loop->idle_handles = NULL;
loop->next_prepare_handle = NULL;
loop->next_check_handle = NULL;
loop->next_idle_handle = NULL;
loop->ares_active_sockets = 0;
loop->ares_chan = NULL;
loop->last_err = uv_ok_;
}
static void uv_default_loop_init(void) {
/* Intialize libuv itself first */
uv_once(&uv_init_guard_, uv_init);
/* Initialize the main loop */
uv_loop_init(&uv_default_loop_);
}
uv_loop_t* uv_default_loop() {
uv_once(&uv_default_loop_init_guard_, uv_default_loop_init);
return &uv_default_loop_;
}
void uv_ref(uv_loop_t* loop) {
loop->refs++;
}
void uv_unref(uv_loop_t* loop) {
loop->refs--;
}
static void uv_poll(uv_loop_t* loop, int block) {
BOOL success;
DWORD bytes, timeout;
ULONG_PTR key;
OVERLAPPED* overlapped;
uv_req_t* req;
if (block) {
timeout = uv_get_poll_timeout(loop);
} else {
timeout = 0;
}
success = GetQueuedCompletionStatus(loop->iocp,
&bytes,
&key,
&overlapped,
timeout);
if (overlapped) {
/* Package was dequeued */
req = uv_overlapped_to_req(overlapped);
uv_insert_pending_req(loop, req);
} else if (GetLastError() != WAIT_TIMEOUT) {
/* Serious error */
uv_fatal_error(GetLastError(), "GetQueuedCompletionStatus");
}
}
static void uv_poll_ex(uv_loop_t* loop, int block) {
BOOL success;
DWORD timeout;
uv_req_t* req;
OVERLAPPED_ENTRY overlappeds[64];
ULONG count;
ULONG i;
if (block) {
timeout = uv_get_poll_timeout(loop);
} else {
timeout = 0;
}
assert(pGetQueuedCompletionStatusEx);
success = pGetQueuedCompletionStatusEx(loop->iocp,
overlappeds,
COUNTOF(overlappeds),
&count,
timeout,
FALSE);
if (success) {
for (i = 0; i < count; i++) {
/* Package was dequeued */
req = uv_overlapped_to_req(overlappeds[i].lpOverlapped);
uv_insert_pending_req(loop, req);
}
} else if (GetLastError() != WAIT_TIMEOUT) {
/* Serious error */
uv_fatal_error(GetLastError(), "GetQueuedCompletionStatusEx");
}
}
#define UV_LOOP(loop, poll) \
while ((loop)->refs > 0) { \
uv_update_time((loop)); \
uv_process_timers((loop)); \
\
/* Call idle callbacks if nothing to do. */ \
if ((loop)->pending_reqs_tail == NULL && \
(loop)->endgame_handles == NULL) { \
uv_idle_invoke((loop)); \
} \
\
/* Completely flush all pending reqs and endgames. */ \
/* We do even when we just called the idle callbacks because those may */ \
/* have closed handles or started requests that short-circuited. */ \
while ((loop)->pending_reqs_tail || (loop)->endgame_handles) { \
uv_process_endgames((loop)); \
uv_process_reqs((loop)); \
} \
\
if ((loop)->refs <= 0) { \
break; \
} \
\
uv_prepare_invoke((loop)); \
\
poll((loop), (loop)->idle_handles == NULL && (loop)->refs > 0); \
\
uv_check_invoke((loop)); \
}
int uv_run(uv_loop_t* loop) {
if (pGetQueuedCompletionStatusEx) {
UV_LOOP(loop, uv_poll_ex);
} else {
UV_LOOP(loop, uv_poll);
}
assert(loop->refs == 0);
return 0;
}
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