common initializer: counting engine init count properly.

Manage the reference count in common so that
all common resources can be initialized/terminated identically.

src/lib/tvgInitializer.cpp

@@ -36,6 +36,8 @@
 /* Internal Class Implementation                                        */
 /************************************************************************/
 
+static int _initCnt = 0;
+
 
 /************************************************************************/
 /* External Class Implementation                                        */
@@ -61,6 +63,9 @@ Result Initializer::init(CanvasEngine engine, uint32_t threads) noexcept
 
     if (nonSupport) return Result::NonSupport;
 
+    if (_initCnt > 0) return Result::Success;
+    ++_initCnt;
+
     if (!LoaderMgr::init()) return Result::Unknown;
 
     TaskScheduler::init(threads);
@@ -71,6 +76,8 @@ Result Initializer::init(CanvasEngine engine, uint32_t threads) noexcept
 
 Result Initializer::term(CanvasEngine engine) noexcept
 {
+    if (_initCnt == 0) return Result::InsufficientCondition;
+
     auto nonSupport = true;
 
     if (static_cast<uint32_t>(engine) & static_cast<uint32_t>(CanvasEngine::Sw)) {
@@ -89,9 +96,12 @@ Result Initializer::term(CanvasEngine engine) noexcept
 
     if (nonSupport) return Result::NonSupport;
 
+    --_initCnt;
+    if (_initCnt > 0) return Result::Success;
+
     TaskScheduler::term();
 
     if (!LoaderMgr::term()) return Result::Unknown;
 
     return Result::Success;
-}
+}

src/lib/tvgLoaderMgr.cpp

@@ -35,9 +35,6 @@
 /* Internal Class Implementation                                        */
 /************************************************************************/
 
-static int initCnt = 0;
-
-
 static Loader* _find(FileType type)
 {
     switch(type) {
@@ -104,9 +101,6 @@ static Loader* _find(const string& path)
 
 bool LoaderMgr::init()
 {
-    if (initCnt > 0) return true;
-    ++initCnt;
-
     //TODO:
 
     return true;
@@ -115,9 +109,6 @@ bool LoaderMgr::init()
 
 bool LoaderMgr::term()
 {
-    --initCnt;
-    if (initCnt > 0) return true;
-
     //TODO:
 
     return true;

src/lib/tvgTaskScheduler.cpp

@@ -189,4 +189,4 @@ unsigned TaskScheduler::threads()
 {
     if (inst) return inst->threadCnt;
     return 0;
-}
+}