编译器错误 C3057
“symbol”:当前不支持“threadprivate”符号的动态初始化
threadprivate 子句中所用符号的初始化值在编译时必须已知。
以下示例生成 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;
}
}
以下示例生成 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;
}
}
}