Why is the != operator not allowed with OpenMP?

Why is the != operator not allowed with OpenMP?

c++ c multithreading parallel-processing openmp

c

Pthreads vs. OpenMP

c pthreads openmp

c

Difference between section and task openmp

c parallel-processing openmp

c

Parallel for vs omp simd: when to use each?

c++ c performance openmp simd

c

OpenMP: are local variables automatically private?

c++ c parallel-processing openmp

c

memory bandwidth for many channels x86 systems

c x86 openmp avx512 memory-bandwidth

c

Helgrind (Valgrind) and OpenMP (C): avoiding false positives?

c openmp valgrind race-condition false-positive

c

Understanding the collapse clause in openmp

c openmp

c

Reductions in parallel in logarithmic time

c algorithm parallel-processing openmp reduce

c