tdlight/tdutils/td/utils/port/detail/Iocp.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/port/detail/Iocp.h"
char disable_linker_warning_about_empty_file_iocp_cpp TD_UNUSED;
#ifdef TD_PORT_WINDOWS
#include "td/utils/logging.h"
namespace td {
namespace detail {
Iocp::~Iocp() {
clear();
}
void Iocp::loop() {
Iocp::Guard guard(this);
while (true) {
DWORD bytes = 0;
ULONG_PTR key = 0;
WSAOVERLAPPED *overlapped = nullptr;
BOOL ok =
GetQueuedCompletionStatus(iocp_handle_->fd(), &bytes, &key, reinterpret_cast<OVERLAPPED **>(&overlapped), 1000);
if (bytes || key || overlapped) {
// LOG(ERROR) << "Got IOCP " << bytes << " " << key << " " << overlapped;
}
if (ok) {
auto callback = reinterpret_cast<Iocp::Callback *>(key);
if (callback == nullptr) {
// LOG(ERROR) << "Interrupt IOCP loop";
return;
}
callback->on_iocp(bytes, overlapped);
} else {
if (overlapped != nullptr) {
auto error = OS_ERROR("Received from IOCP");
auto callback = reinterpret_cast<Iocp::Callback *>(key);
CHECK(callback != nullptr);
callback->on_iocp(std::move(error), overlapped);
}
}
}
}
void Iocp::interrupt_loop() {
post(0, nullptr, nullptr);
}
void Iocp::init() {
CHECK(!iocp_handle_);
auto res = CreateIoCompletionPort(INVALID_HANDLE_VALUE, nullptr, 0, 0);
if (res == nullptr) {
auto error = OS_ERROR("IOCP creation failed");
LOG(FATAL) << error;
}
iocp_handle_ = std::make_shared<NativeFd>(res);
}
void Iocp::clear() {
iocp_handle_.reset();
}
void Iocp::subscribe(const NativeFd &native_fd, Callback *callback) {
CHECK(iocp_handle_);
auto iocp_handle =
CreateIoCompletionPort(native_fd.fd(), iocp_handle_->fd(), reinterpret_cast<ULONG_PTR>(callback), 0);
if (iocp_handle == nullptr) {
auto error = OS_ERROR("CreateIoCompletionPort");
LOG(FATAL) << error;
}
LOG_CHECK(iocp_handle == iocp_handle_->fd()) << iocp_handle << " " << iocp_handle_->fd();
}
IocpRef Iocp::get_ref() const {
return IocpRef(iocp_handle_);
}
static void iocp_post(NativeFd &iocp_handle, size_t size, Iocp::Callback *callback, WSAOVERLAPPED *overlapped) {
if (PostQueuedCompletionStatus(iocp_handle.fd(), DWORD(size), reinterpret_cast<ULONG_PTR>(callback),
reinterpret_cast<OVERLAPPED *>(overlapped)) == 0) {
auto error = OS_ERROR("IOCP post failed");
LOG(FATAL) << error;
}
}
void Iocp::post(size_t size, Callback *callback, WSAOVERLAPPED *overlapped) {
iocp_post(*iocp_handle_, size, callback, overlapped);
}
IocpRef::IocpRef(std::weak_ptr<NativeFd> iocp_handle) : iocp_handle_(std::move(iocp_handle)) {
}
bool IocpRef::post(size_t size, Iocp::Callback *callback, WSAOVERLAPPED *overlapped) {
auto iocp_handle = iocp_handle_.lock();
if (!iocp_handle) {
return false;
}
iocp_post(*iocp_handle, size, callback, overlapped);
return true;
}
} // namespace detail
} // namespace td
#endif