os: implement waitable management.

This implements waitable management for Events (and
implements Events). It also refactors PM to use new
Event/Waitable semantics, and also adds STS_ASSERT
as a macro for asserting a boolean expression. The
rest of stratosphere has been refactored to use
STS_ASSERT whenever possible.

stratosphere/libstratosphere/source/os/impl/os_waitable_manager_impl.hpp

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include "os_waitable_holder_base.hpp"
+
+namespace sts::os::impl {
+
+    class WaitableManagerImpl {
+        public:
+            static constexpr size_t MaximumHandleCount = 0x40;
+            static constexpr s32 WaitInvalid   = -3;
+            static constexpr s32 WaitCancelled = -2;
+            static constexpr s32 WaitTimedOut  = -1;
+            using ListType = util::IntrusiveListMemberTraits<&WaitableHolderBase::manager_node>::ListType;
+        private:
+            ListType waitable_list;
+            WaitableHolderBase *signaled_holder;
+            u64 current_time;
+            Mutex lock;
+            Handle waiting_thread_handle;
+        private:
+            WaitableHolderBase *WaitAnyImpl(bool infinite, u64 timeout);
+            WaitableHolderBase *WaitAnyHandleImpl(bool infinite, u64 timeout);
+            s32                 WaitSynchronization(Handle *handles, size_t count, u64 timeout);
+            size_t              BuildHandleArray(Handle *out_handles, WaitableHolderBase **out_objects);
+
+            WaitableHolderBase *LinkHoldersToObjectList();
+            void                UnlinkHoldersFromObjectList();
+
+            WaitableHolderBase *RecalculateNextTimeout(u64 *out_min_timeout, u64 end_time);
+        public:
+            /* Wait. */
+            WaitableHolderBase *WaitAny() {
+                return this->WaitAnyImpl(true, U64_MAX);
+            }
+
+            WaitableHolderBase *TryWaitAny() {
+                return this->WaitAnyImpl(false, 0);
+            }
+
+            WaitableHolderBase *TimedWaitAny(u64 timeout) {
+                return this->WaitAnyImpl(false, timeout);
+            }
+
+            /* List management. */
+            bool IsEmpty() const {
+                return this->waitable_list.empty();
+            }
+
+            void LinkWaitableHolder(WaitableHolderBase &holder_base) {
+                this->waitable_list.push_back(holder_base);
+            }
+
+            void UnlinkWaitableHolder(WaitableHolderBase &holder_base) {
+                this->waitable_list.erase(this->waitable_list.iterator_to(holder_base));
+            }
+
+            void UnlinkAll() {
+                while (!this->IsEmpty()) {
+                    this->waitable_list.front().SetManager(nullptr);
+                    this->waitable_list.pop_front();
+                }
+            }
+
+            void MoveAllFrom(WaitableManagerImpl &other) {
+                /* Set manager for all of the other's waitables. */
+                for (auto &w : other.waitable_list) {
+                    w.SetManager(this);
+                }
+                this->waitable_list.splice(this->waitable_list.end(), other.waitable_list);
+            }
+
+            /* Other. */
+            u64 GetCurrentTime() const {
+                return this->current_time;
+            }
+
+            void SignalAndWakeupThread(WaitableHolderBase *holder_base);
+    };
+
+}