ams_mitm: Implement emummc Nintendo folder redirection

stratosphere/libstratosphere/source/os/os_semaphore.cpp

@@ -0,0 +1,85 @@
+/*
+ * 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 "impl/os_waitable_object_list.hpp"
+
+namespace ams::os {
+
+    Semaphore::Semaphore(int c, int mc) : count(c), max_count(mc) {
+        new (GetPointer(this->waitlist)) impl::WaitableObjectList();
+    }
+
+    Semaphore::~Semaphore() {
+        GetReference(this->waitlist).~WaitableObjectList();
+    }
+
+    void Semaphore::Acquire() {
+        std::scoped_lock lk(this->mutex);
+
+        while (this->count == 0) {
+            this->condvar.Wait(&this->mutex);
+        }
+
+        this->count--;
+    }
+
+    bool Semaphore::TryAcquire() {
+        std::scoped_lock lk(this->mutex);
+
+        if (this->count == 0) {
+            return false;
+        }
+
+        this->count--;
+        return true;
+    }
+
+    bool Semaphore::TimedAcquire(u64 timeout) {
+        std::scoped_lock lk(this->mutex);
+        TimeoutHelper timeout_helper(timeout);
+
+        while (this->count == 0) {
+            if (timeout_helper.TimedOut()) {
+                return false;
+            }
+
+            this->condvar.TimedWait(&this->mutex, timeout_helper.NsUntilTimeout());
+        }
+
+        this->count--;
+        return true;
+    }
+
+    void Semaphore::Release() {
+        std::scoped_lock lk(this->mutex);
+
+        AMS_ASSERT(this->count + 1 <= this->max_count);
+        this->count++;
+
+        this->condvar.Signal();
+        GetReference(this->waitlist).SignalAllThreads();
+    }
+
+    void Semaphore::Release(int count) {
+        std::scoped_lock lk(this->mutex);
+
+        AMS_ASSERT(this->count + count <= this->max_count);
+        this->count += count;
+
+        this->condvar.Broadcast();
+        GetReference(this->waitlist).SignalAllThreads();
+    }
+
+}