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/os_interrupt_event.cpp

@@ -0,0 +1,112 @@
+/*
+ * 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/>.
+ */
+#include <stratosphere.hpp>
+#include "impl/os_waitable_object_list.hpp"
+
+namespace sts::os {
+
+    Result InterruptEvent::Initialize(u32 interrupt_id, bool autoclear) {
+        STS_ASSERT(!this->is_initialized);
+        this->auto_clear = autoclear;
+
+        const auto type = this->auto_clear ? svc::InterruptType_Edge : svc::InterruptType_Level;
+        R_TRY(svcCreateInterruptEvent(this->handle.GetPointer(), interrupt_id, type));
+
+        this->is_initialized = true;
+        return ResultSuccess;
+    }
+
+    void InterruptEvent::Finalize() {
+        STS_ASSERT(this->is_initialized);
+        R_ASSERT(svcCloseHandle(this->handle.Move()));
+        this->auto_clear = true;
+        this->is_initialized = false;
+    }
+
+    InterruptEvent::InterruptEvent(u32 interrupt_id, bool autoclear) {
+        this->is_initialized = false;
+        R_ASSERT(this->Initialize(interrupt_id, autoclear));
+    }
+
+    void InterruptEvent::Reset() {
+        R_ASSERT(svcClearEvent(this->handle.Get()));
+    }
+
+    void InterruptEvent::Wait() {
+        STS_ASSERT(this->is_initialized);
+
+        while (true) {
+            /* Continuously wait, until success. */
+            R_TRY_CATCH(svcWaitSynchronizationSingle(this->handle.Get(), U64_MAX)) {
+                R_CATCH(ResultKernelCancelled) { continue; }
+            } R_END_TRY_CATCH_WITH_ASSERT;
+
+            /* Clear, if we must. */
+            if (this->auto_clear) {
+                R_TRY_CATCH(svcResetSignal(this->handle.Get())) {
+                    /* Some other thread might have caught this before we did. */
+                    R_CATCH(ResultKernelInvalidState) { continue; }
+                } R_END_TRY_CATCH_WITH_ASSERT;
+            }
+            return;
+        }
+    }
+
+    bool InterruptEvent::TryWait() {
+        STS_ASSERT(this->is_initialized);
+
+        if (this->auto_clear) {
+            /* Auto-clear. Just try to reset. */
+            return R_SUCCEEDED(svcResetSignal(this->handle.Get()));
+        } else {
+            /* Not auto-clear. */
+            while (true) {
+                /* Continuously wait, until success or timeout. */
+                R_TRY_CATCH(svcWaitSynchronizationSingle(this->handle.Get(), 0)) {
+                    R_CATCH(ResultKernelTimedOut) { return false; }
+                    R_CATCH(ResultKernelCancelled) { continue; }
+                } R_END_TRY_CATCH_WITH_ASSERT;
+
+                /* We succeeded, so we're signaled. */
+                return true;
+            }
+        }
+    }
+
+    bool InterruptEvent::TimedWait(u64 ns) {
+        STS_ASSERT(this->is_initialized);
+
+        TimeoutHelper timeout_helper(ns);
+        while (true) {
+            /* Continuously wait, until success or timeout. */
+            R_TRY_CATCH(svcWaitSynchronizationSingle(this->handle.Get(), timeout_helper.NsUntilTimeout())) {
+                R_CATCH(ResultKernelTimedOut) { return false; }
+                R_CATCH(ResultKernelCancelled) { continue; }
+            } R_END_TRY_CATCH_WITH_ASSERT;
+
+            /* Clear, if we must. */
+            if (this->auto_clear) {
+                R_TRY_CATCH(svcResetSignal(this->handle.Get())) {
+                    /* Some other thread might have caught this before we did. */
+                    R_CATCH(ResultKernelInvalidState) { continue; }
+                } R_END_TRY_CATCH_WITH_ASSERT;
+            }
+
+            return true;
+        }
+    }
+
+}