kern: implement KProcess::Run

libraries/libmesosphere/include/mesosphere/kern_k_scoped_resource_reservation.hpp

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2018-2020 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 <mesosphere/kern_common.hpp>
+#include <mesosphere/kern_k_resource_limit.hpp>
+#include <mesosphere/kern_k_process.hpp>
+
+namespace ams::kern {
+
+    class KScopedResourceReservation {
+        private:
+            KResourceLimit *limit;
+            s64 value;
+            ams::svc::LimitableResource resource;
+            bool succeeded;
+        public:
+            ALWAYS_INLINE KScopedResourceReservation(KResourceLimit *l, ams::svc::LimitableResource r, s64 v, s64 timeout) : limit(l), value(v), resource(r) {
+                if (this->limit && this->value) {
+                    this->succeeded = this->limit->Reserve(this->resource, this->value, timeout);
+                } else {
+                    this->succeeded = true;
+                }
+            }
+
+            ALWAYS_INLINE KScopedResourceReservation(KResourceLimit *l, ams::svc::LimitableResource r, s64 v = 1) : limit(l), value(v), resource(r) {
+                if (this->limit && this->value) {
+                    this->succeeded = this->limit->Reserve(this->resource, this->value);
+                } else {
+                    this->succeeded = true;
+                }
+            }
+
+            ALWAYS_INLINE KScopedResourceReservation(const KProcess *p, ams::svc::LimitableResource r, s64 v, s64 t) : KScopedResourceReservation(p->GetResourceLimit(), r, v, t) { /* ... */ }
+            ALWAYS_INLINE KScopedResourceReservation(const KProcess *p, ams::svc::LimitableResource r, s64 v = 1) : KScopedResourceReservation(p->GetResourceLimit(), r, v) { /* ... */ }
+
+            ALWAYS_INLINE ~KScopedResourceReservation() {
+                if (this->limit && this->value && this->succeeded) {
+                    this->limit->Release(this->resource, this->value);
+                }
+            }
+
+            ALWAYS_INLINE void Commit() {
+                this->limit = nullptr;
+            }
+
+            ALWAYS_INLINE bool Succeeded() const {
+                return this->succeeded;
+            }
+    };
+
+}