mirror of
https://github.com/Atmosphere-NX/Atmosphere
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124 lines
4 KiB
C++
124 lines
4 KiB
C++
/*
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* Copyright (c) 2018-2020 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 "sm_wait_list.hpp"
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namespace ams::sm::impl {
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namespace {
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static constexpr size_t DeferredSessionCountMax = 0x40;
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struct WaitListEntry {
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sm::ServiceName service;
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os::WaitableHolderType *session;
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};
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constinit WaitListEntry g_entries[DeferredSessionCountMax];
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constinit WaitListEntry *g_processing_entry = nullptr;
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constinit ServiceName g_triggered_service = InvalidServiceName;
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WaitListEntry *Find(ServiceName service) {
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for (auto &entry : g_entries) {
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if (entry.service == service) {
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return std::addressof(entry);
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}
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}
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return nullptr;
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}
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}
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Result StartRegisterRetry(ServiceName service) {
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/* Check that we're not already processing a retry. */
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AMS_ABORT_UNLESS(g_processing_entry == nullptr);
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/* Find a free entry. */
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auto *entry = Find(InvalidServiceName);
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R_UNLESS(entry != nullptr, sm::ResultOutOfProcesses());
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/* Initialize the entry. */
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entry->service = service;
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entry->session = nullptr;
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/* Set the processing entry. */
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g_processing_entry = entry;
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return sf::ResultRequestDeferredByUser();
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}
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void ProcessRegisterRetry(os::WaitableHolderType *session_holder) {
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/* Verify that we have a processing entry. */
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AMS_ABORT_UNLESS(g_processing_entry != nullptr);
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/* Process the session. */
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g_processing_entry->session = session_holder;
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g_processing_entry = nullptr;
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}
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void TriggerResume(ServiceName service) {
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/* Check that we haven't already triggered a resume. */
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AMS_ABORT_UNLESS(g_triggered_service == InvalidServiceName);
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/* Set the triggered resume. */
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g_triggered_service = service;
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}
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void TestAndResume(ResumeFunction resume_function) {
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/* If we don't have a triggered service, there's nothing to do. */
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if (g_triggered_service == InvalidServiceName) {
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return;
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}
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/* Get and clear the triggered service. */
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const auto resumed_service = g_triggered_service;
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g_triggered_service = InvalidServiceName;
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/* Process all entries. */
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for (size_t i = 0; i < util::size(g_entries); /* ... */) {
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auto &entry = g_entries[i];
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if (entry.service == resumed_service) {
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/* Get the entry's session. */
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auto * const session = entry.session;
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/* Clear the entry. */
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entry.service = InvalidServiceName;
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entry.session = nullptr;
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/* Resume the request. */
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R_TRY_CATCH(resume_function(session)) {
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R_CATCH(sf::ResultRequestDeferred) {
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ProcessRegisterRetry(session);
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}
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} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
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/* Handle nested resumes. */
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if (g_triggered_service != InvalidServiceName) {
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AMS_ABORT_UNLESS(g_triggered_service == resumed_service);
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g_triggered_service = InvalidServiceName;
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i = 0;
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continue;
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}
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}
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/* Advance. */
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++i;
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}
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}
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}
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