Compiler Error C3043

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OpenMP 'critical' directive cannot be nested in 'critical' directive with same name

A critical directive cannot be nested in a critical directive that uses the same name.

The following sample generates C3043:

// C3043.cpp
// compile with: /openmp /c
#include "omp.h"

int main() {
   int n1 = 1, n2 = 2, n3 = 3;

   #pragma omp parallel
   {
      ++n2;

      #pragma omp critical(MyTest)
      {
         ++n2;

         #pragma omp critical(MyTest)   // C3043
         // try the following line instead
         // #pragma omp critical(MyTest2)
         {
            ++n3;
         }
      }
   }
}