INFINITE, INFINITY to always wait actively or an
integer which gives the number of spins of the busy-wait loop. The
integer may optionally be followed by the following suffixes acting
as multiplication factors: k (kilo, thousand), M (mega,
million), G (giga, billion), or T (tera, trillion).
If undefined, 0 is used when OMP_WAIT_POLICY is PASSIVE,
300,000 is used when OMP_WAIT_POLICY is undefined and
30 billion is used when OMP_WAIT_POLICY is ACTIVE.
If there are more OpenMP threads than available CPUs, 1000 and 100
spins are used for OMP_WAIT_POLICY being ACTIVE or
undefined, respectively; unless the GOMP_SPINCOUNT is lower
or OMP_WAIT_POLICY is PASSIVE.