ksys/res: Implement some ResourceMgrTask prerequisites

src/KingSystem/Resource/resUnitPool.cpp

@@ -0,0 +1,33 @@
+#include "KingSystem/Resource/resUnitPool.h"
+
+namespace ksys::res {
+
+ResourceUnitPool::ResourceUnitPool() = default;
+
+ResourceUnitPool::~ResourceUnitPool() = default;
+
+bool ResourceUnitPool::init() {
+    for (s32 i = 0; i < UnitCapacity; ++i)
+        mRingBuffer.pushBack(&mUnits[i]);
+    return true;
+}
+
+ResourceUnit* ResourceUnitPool::tryAlloc() {
+    if (mRingBuffer.empty())
+        return nullptr;
+    return mRingBuffer.popFront();
+}
+
+ResourceUnit* ResourceUnitPool::alloc() {
+    return mRingBuffer.popFront();
+}
+
+void ResourceUnitPool::free(ResourceUnit* unit) {
+    mRingBuffer.pushBack(unit);
+}
+
+void ResourceUnitPool::freeForSync(ResourceUnit* unit) {
+    free(unit);
+}
+
+}  // namespace ksys::res