e044ada65c
* allow 2 threads for CreateIoCompletionPort on single-core * use base::SysInfo::NumberOfProcessors instead of env var * CHECK that uv_loop_ has not been used before replacing its iocp
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
// Copyright (c) 2013 GitHub, Inc.
|
|
// Use of this source code is governed by the MIT license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "atom/common/node_bindings_win.h"
|
|
|
|
#include <windows.h>
|
|
|
|
#include "base/logging.h"
|
|
#include "base/sys_info.h"
|
|
|
|
namespace atom {
|
|
|
|
NodeBindingsWin::NodeBindingsWin(BrowserEnvironment browser_env)
|
|
: NodeBindings(browser_env) {
|
|
// on single-core the io comp port NumberOfConcurrentThreads needs to be 2
|
|
// to avoid cpu pegging likely caused by a busy loop in PollEvents
|
|
if (base::SysInfo::NumberOfProcessors() == 1) {
|
|
// the expectation is the uv_loop_ has just been initialized
|
|
// which makes iocp replacement safe
|
|
CHECK_EQ(0u, uv_loop_->active_handles);
|
|
CHECK_EQ(0u, uv_loop_->active_reqs.count);
|
|
|
|
if (uv_loop_->iocp && uv_loop_->iocp != INVALID_HANDLE_VALUE)
|
|
CloseHandle(uv_loop_->iocp);
|
|
uv_loop_->iocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 2);
|
|
}
|
|
}
|
|
|
|
NodeBindingsWin::~NodeBindingsWin() {}
|
|
|
|
void NodeBindingsWin::PollEvents() {
|
|
// If there are other kinds of events pending, uv_backend_timeout will
|
|
// instruct us not to wait.
|
|
DWORD bytes, timeout;
|
|
ULONG_PTR key;
|
|
OVERLAPPED* overlapped;
|
|
|
|
timeout = uv_backend_timeout(uv_loop_);
|
|
|
|
GetQueuedCompletionStatus(uv_loop_->iocp, &bytes, &key, &overlapped, timeout);
|
|
|
|
// Give the event back so libuv can deal with it.
|
|
if (overlapped != NULL)
|
|
PostQueuedCompletionStatus(uv_loop_->iocp, bytes, key, overlapped);
|
|
}
|
|
|
|
// static
|
|
NodeBindings* NodeBindings::Create(BrowserEnvironment browser_env) {
|
|
return new NodeBindingsWin(browser_env);
|
|
}
|
|
|
|
} // namespace atom
|