[PATCH] msvcrt: Use InitOnceExecuteOnce to allocate TLS index.

[Piotr Caban]

Signed-off-by: Piotr Caban <piotr(a)codeweavers.com>
---
  dlls/msvcrt/concurrency.c | 26 ++++++++++++++------------
  1 file changed, 14 insertions(+), 12 deletions(-)

[Zebediah Figura]

What's the point of doing it this way, instead of the way it was 
previously done?

[Piotr Caban]

> On 2 Feb 2022, at 22:12, Zebediah Figura <zfigura(a)codeweavers.com> wrote:
>
> What's the point of doing it this way, instead of the way it was previously done?

The main reason for this patch is to avoid casts after LONG transition. It also fixes a hypothetical race error when there’s only one slot left.