I need some feedback from some of the math nerds on the list.
The functions gammaf and lgammaf are not reentrant and set a global
'signgam' to indicate the sign.
Currently it looks like druntime/phobos2 use these non-reentrant
versions, which could cause some issues in a threaded environment.
My questions for the math nerds are:
How important is this signgam value?
Should we provide a safe way of getting this value?
In std.math should we wrap the reentrant versions and store signgam in
TLS, or should we expose the *_r reentrant versions in std.math directly?
I think now in D2 global variables are stored thread-local by default,
so providing a safe signgam would be trivial (of course only accessible
to the thread that called the lgamma/gamma).
Another option is to just leave it alone. Personally I couldn't care
less since I have never used the functions.
-- tbone
