Add ReadWriteLock to platform api

Source/Engine/Platform/Unix/UnixReadWriteLock.h

@@ -0,0 +1,71 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#if PLATFORM_UNIX
+
+#include "Engine/Platform/Platform.h"
+#include <pthread.h>
+
+/// <summary>
+/// Unix implementation of a read/write lock that allows for shared reading by multiple threads and exclusive writing by a single thread.
+/// </summary>
+class FLAXENGINE_API UnixReadWriteLock
+{
+private:
+    mutable pthread_rwlock_t _lock;
+
+private:
+    NON_COPYABLE(UnixReadWriteLock);
+
+public:
+    /// <summary>
+    /// Initializes a new instance of the <see cref="UnixReadWriteLock"/> class.
+    /// </summary>
+    UnixReadWriteLock()
+    {
+        pthread_rwlock_init(&_lock, nullptr);
+    }
+
+    /// <summary>
+    /// Finalizes an instance of the <see cref="UnixReadWriteLock"/> class.
+    /// </summary>
+    ~UnixReadWriteLock()
+    {
+        pthread_rwlock_destroy(&_lock);
+    }
+
+public:
+    /// <summary>
+    /// Locks for shared reading.
+    /// </summary>
+    void ReadLock() const
+    {
+        pthread_rwlock_rdlock(&_lock);
+    }
+
+    /// <summary>
+    /// Releases the lock after shared reading.
+    /// </summary>
+    void ReadUnlock() const
+    {
+        pthread_rwlock_unlock(&_lock);
+    }
+    /// <summary>
+    /// Locks for exclusive writing.
+    /// </summary>
+    void WriteLock() const
+    {
+        pthread_rwlock_wrlock(&_lock);
+    }
+
+    /// <summary>
+    /// Releases the lock after exclusive writing.
+    /// </summary>
+    void WriteUnlock() const
+    {
+        pthread_rwlock_unlock(&_lock);
+    }
+};
+
+#endif