Add ReadWriteLock to platform api

Source/Engine/Platform/ReadWriteLock.h

@@ -0,0 +1,15 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#if PLATFORM_WINDOWS || PLATFORM_UWP || PLATFORM_XBOX_ONE || PLATFORM_XBOX_SCARLETT
+#include "Win32/Win32ReadWriteLock.h"
+#elif PLATFORM_LINUX || PLATFORM_ANDROID || PLATFORM_PS4 || PLATFORM_PS5 || PLATFORM_MAC || PLATFORM_IOS
+#include "Unix/UnixReadWriteLock.h"
+#elif PLATFORM_SWITCH
+#include "Platforms/Switch/Engine/Platform/SwitchReadWriteLock.h"
+#else
+#error Missing Read Write Lock implementation!
+#endif
+
+#include "Types.h"

Source/Engine/Platform/Types.h

@@ -8,6 +8,8 @@ class WindowsClipboard;
 typedef WindowsClipboard Clipboard;
 class Win32CriticalSection;
 typedef Win32CriticalSection CriticalSection;
+class Win32ReadWriteLock;
+typedef Win32ReadWriteLock ReadWriteLock;
 class Win32ConditionVariable;
 typedef Win32ConditionVariable ConditionVariable;
 class WindowsFileSystem;
@@ -33,6 +35,8 @@ class ClipboardBase;
 typedef ClipboardBase Clipboard;
 class Win32CriticalSection;
 typedef Win32CriticalSection CriticalSection;
+class Win32ReadWriteLock;
+typedef Win32ReadWriteLock ReadWriteLock;
 class Win32ConditionVariable;
 typedef Win32ConditionVariable ConditionVariable;
 class UWPFileSystem;
@@ -58,6 +62,8 @@ class LinuxClipboard;
 typedef LinuxClipboard Clipboard;
 class UnixCriticalSection;
 typedef UnixCriticalSection CriticalSection;
+class UnixReadWriteLock;
+typedef UnixReadWriteLock ReadWriteLock;
 class UnixConditionVariable;
 typedef UnixConditionVariable ConditionVariable;
 class LinuxFileSystem;
@@ -83,6 +89,8 @@ class ClipboardBase;
 typedef ClipboardBase Clipboard;
 class UnixCriticalSection;
 typedef UnixCriticalSection CriticalSection;
+class UnixReadWriteLock;
+typedef UnixReadWriteLock ReadWriteLock;
 class UnixConditionVariable;
 typedef UnixConditionVariable ConditionVariable;
 class PS4FileSystem;
@@ -108,6 +116,8 @@ class ClipboardBase;
 typedef ClipboardBase Clipboard;
 class UnixCriticalSection;
 typedef UnixCriticalSection CriticalSection;
+class UnixReadWriteLock;
+typedef UnixReadWriteLock ReadWriteLock;
 class UnixConditionVariable;
 typedef UnixConditionVariable ConditionVariable;
 class PS5FileSystem;
@@ -133,6 +143,8 @@ class ClipboardBase;
 typedef ClipboardBase Clipboard;
 class Win32CriticalSection;
 typedef Win32CriticalSection CriticalSection;
+class Win32ReadWriteLock;
+typedef Win32ReadWriteLock ReadWriteLock;
 class Win32ConditionVariable;
 typedef Win32ConditionVariable ConditionVariable;
 class XboxOneFileSystem;
@@ -158,6 +170,8 @@ class ClipboardBase;
 typedef ClipboardBase Clipboard;
 class Win32CriticalSection;
 typedef Win32CriticalSection CriticalSection;
+class Win32ReadWriteLock;
+typedef Win32ReadWriteLock ReadWriteLock;
 class Win32ConditionVariable;
 typedef Win32ConditionVariable ConditionVariable;
 class XboxScarlettFileSystem;
@@ -183,6 +197,8 @@ class ClipboardBase;
 typedef ClipboardBase Clipboard;
 class UnixCriticalSection;
 typedef UnixCriticalSection CriticalSection;
+class UnixReadWriteLock;
+typedef UnixReadWriteLock ReadWriteLock;
 class UnixConditionVariable;
 typedef UnixConditionVariable ConditionVariable;
 class AndroidFileSystem;
@@ -208,6 +224,8 @@ class ClipboardBase;
 typedef ClipboardBase Clipboard;
 class SwitchCriticalSection;
 typedef SwitchCriticalSection CriticalSection;
+class SwitchReadWriteLock;
+typedef SwitchReadWriteLock ReadWriteLock;
 class SwitchConditionVariable;
 typedef SwitchConditionVariable ConditionVariable;
 class SwitchFileSystem;
@@ -233,6 +251,8 @@ class MacClipboard;
 typedef MacClipboard Clipboard;
 class UnixCriticalSection;
 typedef UnixCriticalSection CriticalSection;
+class UnixReadWriteLock;
+typedef UnixReadWriteLock ReadWriteLock;
 class UnixConditionVariable;
 typedef UnixConditionVariable ConditionVariable;
 class MacFileSystem;
@@ -258,6 +278,8 @@ class ClipboardBase;
 typedef ClipboardBase Clipboard;
 class UnixCriticalSection;
 typedef UnixCriticalSection CriticalSection;
+class UnixReadWriteLock;
+typedef UnixReadWriteLock ReadWriteLock;
 class UnixConditionVariable;
 typedef UnixConditionVariable ConditionVariable;
 class iOSFileSystem;

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

Source/Engine/Platform/Win32/Win32ReadWriteLock.h

@@ -0,0 +1,69 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#if PLATFORM_WIN32
+
+#include "WindowsMinimal.h"
+
+/// <summary>
+/// Win32 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 Win32ReadWriteLock
+{
+private:
+    mutable Windows::SRWLOCK _lock;
+
+private:
+    NON_COPYABLE(Win32ReadWriteLock);
+
+public:
+    /// <summary>
+    /// Initializes a new instance of the <see cref="Win32ReadWriteLock"/> class.
+    /// </summary>
+    Win32ReadWriteLock()
+    {
+        Windows::InitializeSRWLock(&_lock);
+    }
+
+    /// <summary>
+    /// Finalizes an instance of the <see cref="Win32ReadWriteLock"/> class.
+    /// </summary>
+    ~Win32ReadWriteLock()
+    {
+    }
+
+public:
+    /// <summary>
+    /// Locks for shared reading.
+    /// </summary>
+    __forceinline void ReadLock() const
+    {
+        Windows::AcquireSRWLockShared(&_lock);
+    }
+
+    /// <summary>
+    /// Releases the lock after shared reading.
+    /// </summary>
+    __forceinline void ReadUnlock() const
+    {
+        Windows::ReleaseSRWLockShared(&_lock);
+    }
+    /// <summary>
+    /// Locks for exclusive writing.
+    /// </summary>
+    __forceinline void WriteLock() const
+    {
+        Windows::AcquireSRWLockExclusive(&_lock);
+    }
+
+    /// <summary>
+    /// Releases the lock after exclusive writing.
+    /// </summary>
+    __forceinline void WriteUnlock() const
+    {
+        Windows::ReleaseSRWLockExclusive(&_lock);
+    }
+};
+
+#endif

Source/Engine/Platform/Win32/WindowsMinimal.h

@@ -65,6 +65,11 @@ namespace Windows
         void* Ptr;
     };
 
+    struct SRWLOCK
+    {
+        void* Ptr;
+    };
+
     struct OVERLAPPED
     {
         void* Data1[3];
@@ -96,6 +101,12 @@ namespace Windows
     WIN_API void WIN_API_CALLCONV WakeConditionVariable(CONDITION_VARIABLE* ConditionVariable);
     WIN_API void WIN_API_CALLCONV WakeAllConditionVariable(CONDITION_VARIABLE* ConditionVariable);
 
+    WIN_API void WIN_API_CALLCONV InitializeSRWLock(SRWLOCK* SRWLock);
+    WIN_API void WIN_API_CALLCONV AcquireSRWLockShared(SRWLOCK* SRWLock);
+    WIN_API void WIN_API_CALLCONV ReleaseSRWLockShared(SRWLOCK* SRWLock);
+    WIN_API void WIN_API_CALLCONV AcquireSRWLockExclusive(SRWLOCK* SRWLock);
+    WIN_API void WIN_API_CALLCONV ReleaseSRWLockExclusive(SRWLOCK* SRWLock);
+
     class IDataObject;
     typedef GUID IID;