mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
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126 lines
4.0 KiB
C++
126 lines
4.0 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include <stratosphere/windows.hpp>
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#include "os_inter_process_event.hpp"
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#include "os_inter_process_event_impl.os.windows.hpp"
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#include "os_giant_lock.hpp"
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#include "os_timeout_helper.hpp"
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namespace ams::os::impl {
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bool InterProcessEventWindowsImpl::ResetEventSignal(NativeHandle handle) {
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std::scoped_lock lk(GetGiantLock());
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if (auto ret = ::WaitForSingleObject(handle, 0); ret == WAIT_OBJECT_0) {
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::ResetEvent(handle);
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return true;
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} else {
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return false;
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}
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}
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Result InterProcessEventWindowsImpl::Create(NativeHandle *out_write, NativeHandle *out_read) {
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/* Create the writable handle. */
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auto write = ::CreateEvent(nullptr, true, false, nullptr);
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AMS_ASSERT(write != os::InvalidNativeHandle);
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/* Create the read handle. */
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os::NativeHandle read;
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const auto cur_proc = ::GetCurrentProcess();
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const auto ret = ::DuplicateHandle(cur_proc, write, cur_proc, std::addressof(read), 0, false, DUPLICATE_SAME_ACCESS);
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AMS_ASSERT(ret != 0);
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AMS_UNUSED(ret);
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/* Set the output. */
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*out_write = write;
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*out_read = read;
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R_SUCCEED();
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}
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void InterProcessEventWindowsImpl::Close(NativeHandle handle) {
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if (handle != os::InvalidNativeHandle) {
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const auto ret = ::CloseHandle(handle);
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AMS_ASSERT(ret != 0);
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AMS_UNUSED(ret);
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}
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}
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void InterProcessEventWindowsImpl::Signal(NativeHandle handle) {
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const auto ret = ::SetEvent(handle);
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AMS_ASSERT(ret != 0);
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AMS_UNUSED(ret);
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}
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void InterProcessEventWindowsImpl::Clear(NativeHandle handle) {
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const auto ret = ::ResetEvent(handle);
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AMS_ASSERT(ret != 0);
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AMS_UNUSED(ret);
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}
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void InterProcessEventWindowsImpl::Wait(NativeHandle handle, bool auto_clear) {
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while (true) {
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/* Continuously wait, until success. */
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auto ret = ::WaitForSingleObject(handle, INFINITE);
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AMS_ASSERT(ret == WAIT_OBJECT_0);
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AMS_UNUSED(ret);
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/* If we're not obligated to clear, we're done. */
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if (!auto_clear) {
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return;
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}
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/* Try to reset. */
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if (ResetEventSignal(handle)) {
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return;
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}
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}
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}
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bool InterProcessEventWindowsImpl::TryWait(NativeHandle handle, bool auto_clear) {
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/* If we're auto clear, just try to reset. */
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if (auto_clear) {
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return ResetEventSignal(handle);
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}
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const auto ret = ::WaitForSingleObject(handle, 0);
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AMS_ASSERT((ret == WAIT_OBJECT_0) || (ret == WAIT_TIMEOUT));
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return ret == WAIT_OBJECT_0;
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}
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bool InterProcessEventWindowsImpl::TimedWait(NativeHandle handle, bool auto_clear, TimeSpan timeout) {
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TimeoutHelper timeout_helper(timeout);
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do {
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if (const auto res = ::WaitForSingleObject(handle, timeout_helper.GetTimeLeftOnTarget()); res == WAIT_OBJECT_0) {
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/* If we're not obligated to clear, we're done. */
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if (!auto_clear) {
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return true;
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}
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/* Try to reset. */
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if (ResetEventSignal(handle)) {
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return true;
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}
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}
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} while (!timeout_helper.TimedOut());
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return false;
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}
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}
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