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This is currently not specified in more detail, and subject to
change.

This variable is validated via setter.

=item C<GOMP_STACKSIZE>

Determines how long a threads waits actively with consuming CPU
power before waiting passively without consuming CPU power. The
value may be either 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.