編譯器錯誤 C3057

'symbol': 目前不支援 'threadprivate' 符號的動態初始設定

threadprivate 子句所用符號之初始化的值必須是編譯時期已知的值。

下列範例會產生 C3057：

// C3057.cpp
// compile with: /openmp /c
extern int f();
int x, y = f();
int a, b;
#pragma omp threadprivate(x, y)   // C3057

#pragma omp threadprivate(a, b)

int main() {
   // Delete the following 4 lines to resolve.
   #pragma omp parallel copyin(x, y)
   {
      x = y;
   }

   #pragma omp parallel copyin(a, b)
   {
      a = b;
   }
}

下列範例會產生 C3057：

// C3057b.cpp
// compile with: /openmp /c
extern int Initialize();
int main() {
   #pragma omp parallel
   {
      static int var = Initialize();
      #pragma omp threadprivate(var)   // C3057
   }

   // OK
   #pragma omp parallel
   {
      static int var2;
      static bool initialized2;
      #pragma omp threadprivate(var2, initialized2)
      if (!initialized2) {
         var2 = Initialize();
         initialized2 = true;
      }
   }
}